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6-K 1 gmab-20250331x6k.htm 6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



FORM 6-K


REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE MONTH OF MARCH 2025


COMMISSION FILE NUMBER 001-38976

Genmab A/S
(Exact name of Registrant as specified in its charter)

Carl Jacobsens Vej 30

2500 Valby

Denmark

+45 70 20 27 28
(Address of principal executive offices)


Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ⌧ Form 40-F ◻

This report on Form 6-K shall be deemed to be incorporated by reference in Genmab A/S’s registration statements on Form S-8 (File No. 333-232693, 333-253519, 333-262970, 333-277273 and 333-284876) and to be a part thereof from the date on which this report is filed, to the extent not superseded by documents or reports subsequently filed or furnished.


SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

nthony

GENMAB A/S

BY:

/s/ Anthony Pagano

Name: Anthony Pagano

Title: Executive Vice President & Chief Financial Officer

DATE: MARCH 31, 2025


EXHIBIT INDEX

O

Exhibit

Description of Exhibit

99.1 

Company Announcement Dated March 31, 2025: Transactions in Connection with Share Buy-back Program 

99.1(a) 

Appendix: Share Buy-Back Program Transactions March 26 to 28, 2025 


EX-99.1 2 gmab-20250331xex99d1.htm EX-99.1

Exhibit 99.1

Graphic

Transactions in connection with share buy-back program

Company Announcement

COPENHAGEN, Denmark; March 31, 2025 – Genmab A/S (Nasdaq: GMAB). On March 25, 2025, Genmab announced the initiation of a share buy-back program to repurchase up to 2.2 million shares to reduce capital and to honor our commitments under the Restricted Stock Unit program. The share buy-back program is expected to be completed no later than July 10, 2025.

The following transactions were executed under the program from March 26 to March 28, 2025:

Trading Platform

No. of shares

Average price (DKK)

Total value (DKK)

March 26, 2025

XCSE

45,467

1,357.43

BCXE

21,311

1,357.41

AQEU

4,148

1,359.16

TQEX

4,174

1,356.43

Total

75,100

1,357.47

101,945,764.19

March 27, 2025

XCSE

48,249

1,380.52

BCXE

23,000

1,380.11

AQEU

4,357

1,382.59

TQEX

4,472

1,378.49

Total

80,078

1,380.40

110,539,671.20

March 28, 2025

XCSE

46,924

1,371.40

BCXE

23,961

1,371.22

AQEU

2,693

1,371.96

TQEX

4,800

1,371.78

Total

78,378

1,371.39

107,486,507.58

Total

233,556

319,971,942.97

Details of each transaction are included as an appendix to this announcement.

Following these transactions, Genmab holds 2,771,544 shares as treasury shares, corresponding to 4.19% of the total share capital and voting rights.

The share buy-back program is undertaken in accordance with Regulation (EU) No. 596/2014 (‘MAR’) and the Commission Delegated Regulation (EU) 2016/1052, also referred to as the “Safe Harbour Regulation.” Further details on the terms of the share buy-back program can be found in our company announcement no. 14 dated March 25, 2025.

About Genmab

Genmab is an international biotechnology company with a core purpose of guiding its unstoppable team to strive toward improving the lives of patients with innovative and differentiated antibody therapeutics. For more than 25 years, its passionate, innovative and collaborative team has invented next-generation antibody technology platforms and leveraged translational, quantitative and data sciences, resulting in a proprietary pipeline including bispecific T-cell engagers, antibody-drug conjugates, next-generation immune checkpoint modulators and effector function-enhanced antibodies. By 2030, Genmab’s vision is to transform the lives of people with cancer and other serious diseases with knock-your-socks-off (KYSO) antibody medicines®. 

Genmab A/S

Tel: +45 7020 2728

Company Announcement no. 15

Carl Jacobsens Vej 30

Fax: +45 7020 2729

Page 1/2

2500 Valby, Denmark

www.genmab.com

CVR no. 2102 3884

LEI Code 529900MTJPDPE4MHJ122


Graphic

Transactions in connection with share buy-back program

Established in 1999, Genmab is headquartered in Copenhagen, Denmark, with international presence across North America, Europe and Asia Pacific. For more information, please visit Genmab.com and follow us on LinkedIn and X.

Contact:
Marisol Peron, Senior Vice President, Global Communications & Corporate Affairs

T: +1 609 524 0065; E: mmp@genmab.com

Andrew Carlsen, Vice President, Head of Investor Relations

T: +45 3377 9558; E: acn@genmab.com


This Company Announcement contains forward looking statements. The words “believe,” “expect,” “anticipate,” “intend” and “plan” and similar expressions identify forward looking statements. Actual results or performance may differ materially from any future results or performance expressed or implied by such statements. The important factors that could cause our actual results or performance to differ materially include, among others, risks associated with pre-clinical and clinical development of products, uncertainties related to the outcome and conduct of clinical trials including unforeseen safety issues, uncertainties related to product manufacturing, the lack of market acceptance of our products, our inability to manage growth, the competitive environment in relation to our business area and markets, our inability to attract and retain suitably qualified personnel, the unenforceability or lack of protection of our patents and proprietary rights, our relationships with affiliated entities, changes and developments in technology which may render our products or technologies obsolete, and other factors. For a further discussion of these risks, please refer to the risk management sections in Genmab’s most recent financial reports, which are available on www.genmab.com and the risk factors included in Genmab’s most recent Annual Report on Form 20-F and other filings with the U.S. Securities and Exchange Commission (SEC), which are available at www.sec.gov. Genmab does not undertake any obligation to update or revise forward looking statements in this Company Announcement nor to confirm such statements to reflect subsequent events or circumstances after the date made or in relation to actual results, unless required by law.


Genmab A/S and/or its subsidiaries own the following trademarks: Genmab®; the Y-shaped Genmab logo®; Genmab in combination with the Y-shaped Genmab logo®; HuMax®; DuoBody®; HexaBody®; DuoHexaBody®, HexElect® and KYSO®.

Genmab A/S

Tel: +45 7020 2728

Company Announcement no. 15

Carl Jacobsens Vej 30

Fax: +45 7020 2729

Page 2/2

2500 Valby, Denmark

www.genmab.com

CVR no. 2102 3884

LEI Code 529900MTJPDPE4MHJ122


EX-99.1(A) 3 gmab-20250331xex99d1a.htm EX-99.1(A)

Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

Issuer

Date

Time CET

Quantity

Price (DKK)

Venue

GENMAB A/S

26-Mar-25

9:30:18 AM

70

1337.00

XCSE

GENMAB A/S

26-Mar-25

9:30:42 AM

42

1338.00

XCSE

GENMAB A/S

26-Mar-25

9:30:42 AM

67

1338.00

CEUX

GENMAB A/S

26-Mar-25

9:32:04 AM

56

1338.50

XCSE

GENMAB A/S

26-Mar-25

9:32:04 AM

68

1339.50

XCSE

GENMAB A/S

26-Mar-25

9:32:04 AM

1

1339.50

XCSE

GENMAB A/S

26-Mar-25

9:32:04 AM

4

1338.50

XCSE

GENMAB A/S

26-Mar-25

9:32:04 AM

24

1339.00

CEUX

GENMAB A/S

26-Mar-25

9:32:04 AM

39

1338.00

CEUX

GENMAB A/S

26-Mar-25

9:32:04 AM

63

1339.00

TQEX

GENMAB A/S

26-Mar-25

9:32:04 AM

68

1338.00

TQEX

GENMAB A/S

26-Mar-25

9:32:04 AM

64

1338.00

AQEU

GENMAB A/S

26-Mar-25

9:32:04 AM

71

1339.00

AQEU

GENMAB A/S

26-Mar-25

9:34:10 AM

30

1339.00

CEUX

GENMAB A/S

26-Mar-25

9:36:02 AM

18

1340.50

CEUX

GENMAB A/S

26-Mar-25

9:36:02 AM

37

1340.50

CEUX

GENMAB A/S

26-Mar-25

9:36:02 AM

32

1340.50

AQEU

GENMAB A/S

26-Mar-25

9:36:04 AM

72

1340.00

XCSE

GENMAB A/S

26-Mar-25

9:36:04 AM

7

1340.00

TQEX

GENMAB A/S

26-Mar-25

9:36:04 AM

16

1340.00

TQEX

GENMAB A/S

26-Mar-25

9:36:06 AM

26

1339.50

CEUX

GENMAB A/S

26-Mar-25

9:36:06 AM

12

1339.50

CEUX

GENMAB A/S

26-Mar-25

9:39:00 AM

23

1339.50

AQEU

GENMAB A/S

26-Mar-25

9:39:01 AM

23

1339.00

TQEX

GENMAB A/S

26-Mar-25

9:39:11 AM

15

1338.50

XCSE

GENMAB A/S

26-Mar-25

9:39:19 AM

54

1338.50

XCSE

GENMAB A/S

26-Mar-25

9:39:32 AM

22

1338.00

CEUX

GENMAB A/S

26-Mar-25

9:39:32 AM

3

1338.00

CEUX

GENMAB A/S

26-Mar-25

9:39:33 AM

75

1338.00

XCSE

GENMAB A/S

26-Mar-25

9:39:33 AM

53

1338.50

CEUX

GENMAB A/S

26-Mar-25

9:40:16 AM

39

1337.00

XCSE

GENMAB A/S

26-Mar-25

9:40:16 AM

3

1337.00

CEUX

GENMAB A/S

26-Mar-25

9:41:21 AM

72

1337.00

XCSE

GENMAB A/S

26-Mar-25

9:41:21 AM

34

1337.00

CEUX

GENMAB A/S

26-Mar-25

9:41:24 AM

33

1336.00

CEUX

GENMAB A/S

26-Mar-25

9:41:24 AM

14

1336.00

CEUX

GENMAB A/S

26-Mar-25

9:41:24 AM

23

1336.00

TQEX

GENMAB A/S

26-Mar-25

9:42:39 AM

73

1335.50

XCSE

GENMAB A/S

26-Mar-25

9:42:39 AM

48

1334.50

XCSE

GENMAB A/S

26-Mar-25

9:42:39 AM

27

1334.50

XCSE

GENMAB A/S

26-Mar-25

9:42:39 AM

44

1335.00

CEUX

GENMAB A/S

26-Mar-25

9:43:04 AM

71

1333.50

XCSE

GENMAB A/S

26-Mar-25

9:43:04 AM

64

1333.50

CEUX

1


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

9:43:27 AM

71

1332.50

XCSE

GENMAB A/S

26-Mar-25

9:43:27 AM

49

1332.50

CEUX

GENMAB A/S

26-Mar-25

9:43:29 AM

1

1331.50

XCSE

GENMAB A/S

26-Mar-25

9:44:14 AM

8

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:44:14 AM

24

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:45:04 AM

71

1334.00

CEUX

GENMAB A/S

26-Mar-25

9:46:05 AM

73

1334.00

CEUX

GENMAB A/S

26-Mar-25

9:47:01 AM

23

1334.00

XCSE

GENMAB A/S

26-Mar-25

9:47:12 AM

12

1334.00

XCSE

GENMAB A/S

26-Mar-25

9:47:12 AM

11

1334.00

XCSE

GENMAB A/S

26-Mar-25

9:47:28 AM

20

1334.00

CEUX

GENMAB A/S

26-Mar-25

9:48:01 AM

23

1335.00

XCSE

GENMAB A/S

26-Mar-25

9:48:01 AM

4

1335.00

XCSE

GENMAB A/S

26-Mar-25

9:48:01 AM

74

1334.50

XCSE

GENMAB A/S

26-Mar-25

9:48:26 AM

2

1334.50

CEUX

GENMAB A/S

26-Mar-25

9:48:50 AM

12

1334.50

XCSE

GENMAB A/S

26-Mar-25

9:48:50 AM

58

1334.50

XCSE

GENMAB A/S

26-Mar-25

9:49:03 AM

73

1334.50

XCSE

GENMAB A/S

26-Mar-25

9:49:27 AM

29

1334.50

CEUX

GENMAB A/S

26-Mar-25

9:49:28 AM

52

1334.00

CEUX

GENMAB A/S

26-Mar-25

9:49:28 AM

23

1334.00

TQEX

GENMAB A/S

26-Mar-25

9:50:01 AM

1

1333.50

XCSE

GENMAB A/S

26-Mar-25

9:50:01 AM

69

1333.50

XCSE

GENMAB A/S

26-Mar-25

9:50:02 AM

18

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:50:02 AM

42

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:50:02 AM

21

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:50:02 AM

4

1332.50

XCSE

GENMAB A/S

26-Mar-25

9:50:02 AM

42

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:50:02 AM

27

1333.00

TQEX

GENMAB A/S

26-Mar-25

9:51:32 AM

42

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:51:32 AM

30

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:51:32 AM

14

1332.50

XCSE

GENMAB A/S

26-Mar-25

9:51:32 AM

11

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:51:32 AM

73

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:51:32 AM

23

1333.00

TQEX

GENMAB A/S

26-Mar-25

9:51:49 AM

27

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:51:54 AM

6

1332.50

XCSE

GENMAB A/S

26-Mar-25

9:52:06 AM

47

1332.50

XCSE

GENMAB A/S

26-Mar-25

9:52:41 AM

37

1332.00

XCSE

GENMAB A/S

26-Mar-25

9:52:41 AM

74

1332.00

CEUX

GENMAB A/S

26-Mar-25

9:52:41 AM

5

1331.50

TQEX

GENMAB A/S

26-Mar-25

9:52:44 AM

9

1331.50

TQEX

GENMAB A/S

26-Mar-25

9:53:03 AM

2

1331.50

TQEX

GENMAB A/S

26-Mar-25

9:53:17 AM

11

1331.50

TQEX

GENMAB A/S

26-Mar-25

9:54:27 AM

16

1332.50

CEUX

2


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

9:54:29 AM

1

1332.50

CEUX

GENMAB A/S

26-Mar-25

9:54:46 AM

42

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:54:46 AM

12

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:54:46 AM

30

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:54:46 AM

7

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:54:46 AM

3

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:54:48 AM

9

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:54:48 AM

1

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:54:48 AM

31

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:54:48 AM

28

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:54:48 AM

18

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:55:15 AM

36

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:55:26 AM

2

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:56:05 AM

72

1332.00

XCSE

GENMAB A/S

26-Mar-25

9:56:05 AM

72

1332.00

CEUX

GENMAB A/S

26-Mar-25

9:56:05 AM

29

1332.00

TQEX

GENMAB A/S

26-Mar-25

9:56:26 AM

1

1332.50

CEUX

GENMAB A/S

26-Mar-25

9:56:27 AM

1

1332.50

CEUX

GENMAB A/S

26-Mar-25

9:56:41 AM

23

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:56:41 AM

9

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:56:41 AM

6

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:56:41 AM

17

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:56:41 AM

8

1333.00

CEUX

GENMAB A/S

26-Mar-25

9:56:44 AM

58

1332.50

CEUX

GENMAB A/S

26-Mar-25

9:56:54 AM

50

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:54 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:54 AM

8

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:54 AM

74

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:54 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:54 AM

74

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:54 AM

33

1333.00

TQEX

GENMAB A/S

26-Mar-25

9:56:55 AM

3

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:55 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:57 AM

53

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:57 AM

3

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:57 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:57 AM

21

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:57 AM

60

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:57 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:57 AM

12

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:58 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:58 AM

74

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:58 AM

74

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:58 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:59 AM

11

1333.00

XCSE

3


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

9:56:59 AM

72

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:59 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:59 AM

74

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:56:59 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:00 AM

3

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:00 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:00 AM

3

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:00 AM

3

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:00 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:00 AM

75

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:00 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:00 AM

44

1333.00

TQEX

GENMAB A/S

26-Mar-25

9:57:01 AM

74

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:01 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:01 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:01 AM

74

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:02 AM

3

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:02 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:02 AM

3

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:02 AM

20

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:04 AM

13

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:04 AM

9

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:04 AM

1

1333.00

XCSE

GENMAB A/S

26-Mar-25

9:57:07 AM

15

1332.50

CEUX

GENMAB A/S

26-Mar-25

9:57:28 AM

73

1332.00

XCSE

GENMAB A/S

26-Mar-25

9:57:28 AM

24

1332.00

TQEX

GENMAB A/S

26-Mar-25

9:57:54 AM

2

1332.00

CEUX

GENMAB A/S

26-Mar-25

9:58:26 AM

5

1332.00

CEUX

GENMAB A/S

26-Mar-25

9:59:14 AM

36

1332.00

CEUX

GENMAB A/S

26-Mar-25

9:59:14 AM

27

1332.00

CEUX

GENMAB A/S

26-Mar-25

9:59:34 AM

26

1332.00

CEUX

GENMAB A/S

26-Mar-25

9:59:34 AM

7

1332.00

CEUX

GENMAB A/S

26-Mar-25

9:59:40 AM

25

1331.00

XCSE

GENMAB A/S

26-Mar-25

9:59:40 AM

71

1331.50

CEUX

GENMAB A/S

26-Mar-25

9:59:43 AM

47

1331.00

XCSE

GENMAB A/S

26-Mar-25

10:00:04 AM

20

1330.50

CEUX

GENMAB A/S

26-Mar-25

10:00:04 AM

14

1330.50

CEUX

GENMAB A/S

26-Mar-25

10:00:04 AM

35

1330.50

CEUX

GENMAB A/S

26-Mar-25

10:00:04 AM

10

1330.50

TQEX

GENMAB A/S

26-Mar-25

10:00:04 AM

18

1330.50

TQEX

GENMAB A/S

26-Mar-25

10:00:06 AM

2

1330.50

TQEX

GENMAB A/S

26-Mar-25

10:00:18 AM

71

1329.50

XCSE

GENMAB A/S

26-Mar-25

10:01:22 AM

39

1331.00

XCSE

GENMAB A/S

26-Mar-25

10:01:23 AM

42

1331.00

XCSE

GENMAB A/S

26-Mar-25

10:01:23 AM

8

1331.00

XCSE

4


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

10:01:23 AM

8

1331.00

XCSE

GENMAB A/S

26-Mar-25

10:02:00 AM

4

1331.00

XCSE

GENMAB A/S

26-Mar-25

10:02:00 AM

42

1331.00

XCSE

GENMAB A/S

26-Mar-25

10:02:11 AM

23

1331.00

XCSE

GENMAB A/S

26-Mar-25

10:02:34 AM

72

1330.50

XCSE

GENMAB A/S

26-Mar-25

10:02:34 AM

71

1330.50

CEUX

GENMAB A/S

26-Mar-25

10:02:34 AM

33

1330.50

TQEX

GENMAB A/S

26-Mar-25

10:02:55 AM

43

1329.50

CEUX

GENMAB A/S

26-Mar-25

10:02:55 AM

28

1329.50

CEUX

GENMAB A/S

26-Mar-25

10:02:58 AM

10

1329.50

XCSE

GENMAB A/S

26-Mar-25

10:02:58 AM

59

1329.50

XCSE

GENMAB A/S

26-Mar-25

10:02:58 AM

23

1329.50

TQEX

GENMAB A/S

26-Mar-25

10:03:45 AM

34

1329.00

XCSE

GENMAB A/S

26-Mar-25

10:03:45 AM

8

1329.00

XCSE

GENMAB A/S

26-Mar-25

10:03:45 AM

28

1329.00

XCSE

GENMAB A/S

26-Mar-25

10:03:45 AM

24

1328.50

CEUX

GENMAB A/S

26-Mar-25

10:03:45 AM

50

1328.50

CEUX

GENMAB A/S

26-Mar-25

10:04:21 AM

66

1328.50

CEUX

GENMAB A/S

26-Mar-25

10:04:46 AM

71

1328.00

XCSE

GENMAB A/S

26-Mar-25

10:04:50 AM

23

1328.00

XCSE

GENMAB A/S

26-Mar-25

10:04:50 AM

42

1328.00

XCSE

GENMAB A/S

26-Mar-25

10:04:50 AM

4

1328.00

XCSE

GENMAB A/S

26-Mar-25

10:04:50 AM

25

1328.00

XCSE

GENMAB A/S

26-Mar-25

10:05:29 AM

70

1330.00

XCSE

GENMAB A/S

26-Mar-25

10:05:29 AM

21

1330.00

CEUX

GENMAB A/S

26-Mar-25

10:05:29 AM

18

1330.00

AQEU

GENMAB A/S

26-Mar-25

10:05:30 AM

58

1330.00

XCSE

GENMAB A/S

26-Mar-25

10:05:30 AM

39

1330.00

XCSE

GENMAB A/S

26-Mar-25

10:05:30 AM

11

1330.00

XCSE

GENMAB A/S

26-Mar-25

10:05:30 AM

12

1330.00

XCSE

GENMAB A/S

26-Mar-25

10:05:30 AM

42

1330.00

XCSE

GENMAB A/S

26-Mar-25

10:05:30 AM

1

1330.00

XCSE

GENMAB A/S

26-Mar-25

10:05:30 AM

12

1330.00

XCSE

GENMAB A/S

26-Mar-25

10:05:30 AM

13

1330.00

XCSE

GENMAB A/S

26-Mar-25

10:05:30 AM

51

1330.00

CEUX

GENMAB A/S

26-Mar-25

10:05:30 AM

25

1330.00

TQEX

GENMAB A/S

26-Mar-25

10:05:30 AM

7

1330.00

AQEU

GENMAB A/S

26-Mar-25

10:05:53 AM

75

1329.00

XCSE

GENMAB A/S

26-Mar-25

10:05:53 AM

74

1329.00

CEUX

GENMAB A/S

26-Mar-25

10:05:53 AM

23

1329.00

AQEU

GENMAB A/S

26-Mar-25

10:11:06 AM

13

1331.50

XCSE

GENMAB A/S

26-Mar-25

10:11:12 AM

25

1331.50

XCSE

GENMAB A/S

26-Mar-25

10:11:57 AM

13

1331.50

XCSE

GENMAB A/S

26-Mar-25

10:11:57 AM

10

1331.50

XCSE

GENMAB A/S

26-Mar-25

10:11:57 AM

37

1331.50

XCSE

5


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

10:11:57 AM

42

1331.50

XCSE

GENMAB A/S

26-Mar-25

10:12:51 AM

73

1333.50

XCSE

GENMAB A/S

26-Mar-25

10:12:56 AM

15

1333.50

XCSE

GENMAB A/S

26-Mar-25

10:12:56 AM

12

1333.50

XCSE

GENMAB A/S

26-Mar-25

10:12:56 AM

19

1333.50

XCSE

GENMAB A/S

26-Mar-25

10:12:56 AM

69

1333.00

CEUX

GENMAB A/S

26-Mar-25

10:13:21 AM

5

1333.50

CEUX

GENMAB A/S

26-Mar-25

10:13:21 AM

68

1333.50

CEUX

GENMAB A/S

26-Mar-25

10:13:22 AM

10

1333.50

XCSE

GENMAB A/S

26-Mar-25

10:13:22 AM

7

1333.50

XCSE

GENMAB A/S

26-Mar-25

10:14:23 AM

27

1334.00

TQEX

GENMAB A/S

26-Mar-25

10:14:23 AM

1

1334.00

TQEX

GENMAB A/S

26-Mar-25

10:14:26 AM

3

1334.00

XCSE

GENMAB A/S

26-Mar-25

10:14:32 AM

6

1333.50

XCSE

GENMAB A/S

26-Mar-25

10:16:02 AM

10

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:02 AM

42

1334.00

XCSE

GENMAB A/S

26-Mar-25

10:16:02 AM

42

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:02 AM

75

1334.50

CEUX

GENMAB A/S

26-Mar-25

10:16:02 AM

23

1334.00

TQEX

GENMAB A/S

26-Mar-25

10:16:02 AM

39

1334.00

AQEU

GENMAB A/S

26-Mar-25

10:16:03 AM

30

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:03 AM

42

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:09 AM

42

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:09 AM

30

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:09 AM

70

1334.50

CEUX

GENMAB A/S

26-Mar-25

10:16:27 AM

30

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:27 AM

42

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:27 AM

58

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:27 AM

6

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:47 AM

42

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:47 AM

10

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:16:48 AM

27

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:17:03 AM

37

1334.00

AQEU

GENMAB A/S

26-Mar-25

10:17:29 AM

11

1335.00

TQEX

GENMAB A/S

26-Mar-25

10:17:44 AM

16

1335.00

TQEX

GENMAB A/S

26-Mar-25

10:18:06 AM

73

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:18:06 AM

72

1334.50

CEUX

GENMAB A/S

26-Mar-25

10:18:06 AM

23

1334.50

AQEU

GENMAB A/S

26-Mar-25

10:18:55 AM

23

1334.00

XCSE

GENMAB A/S

26-Mar-25

10:20:26 AM

42

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:20:26 AM

1

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:20:26 AM

2

1334.50

XCSE

GENMAB A/S

26-Mar-25

10:21:14 AM

25

1336.00

CEUX

GENMAB A/S

26-Mar-25

10:22:04 AM

73

1336.00

XCSE

GENMAB A/S

26-Mar-25

10:22:04 AM

48

1336.00

CEUX

6


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

10:22:04 AM

23

1336.00

TQEX

GENMAB A/S

26-Mar-25

10:22:04 AM

23

1336.00

AQEU

GENMAB A/S

26-Mar-25

10:22:54 AM

42

1336.00

XCSE

GENMAB A/S

26-Mar-25

10:22:54 AM

11

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:22:54 AM

41

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:22:55 AM

12

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:22:55 AM

1

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:22:55 AM

58

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:22:55 AM

12

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:22:55 AM

11

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:22:57 AM

73

1337.00

XCSE

GENMAB A/S

26-Mar-25

10:22:57 AM

20

1337.00

XCSE

GENMAB A/S

26-Mar-25

10:22:57 AM

35

1337.00

XCSE

GENMAB A/S

26-Mar-25

10:22:59 AM

24

1337.00

AQEU

GENMAB A/S

26-Mar-25

10:23:06 AM

60

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:23:06 AM

15

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:23:06 AM

25

1336.50

CEUX

GENMAB A/S

26-Mar-25

10:23:06 AM

47

1336.50

CEUX

GENMAB A/S

26-Mar-25

10:23:06 AM

9

1336.50

TQEX

GENMAB A/S

26-Mar-25

10:23:06 AM

33

1336.50

TQEX

GENMAB A/S

26-Mar-25

10:23:57 AM

69

1336.50

CEUX

GENMAB A/S

26-Mar-25

10:25:08 AM

11

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:25:08 AM

10

1336.50

XCSE

GENMAB A/S

26-Mar-25

10:25:21 AM

71

1336.00

XCSE

GENMAB A/S

26-Mar-25

10:25:21 AM

69

1335.50

CEUX

GENMAB A/S

26-Mar-25

10:25:21 AM

27

1336.00

AQEU

GENMAB A/S

26-Mar-25

10:25:23 AM

1

1336.00

AQEU

GENMAB A/S

26-Mar-25

10:25:28 AM

73

1335.00

XCSE

GENMAB A/S

26-Mar-25

10:25:28 AM

1

1336.00

AQEU

GENMAB A/S

26-Mar-25

10:26:45 AM

23

1337.00

AQEU

GENMAB A/S

26-Mar-25

10:27:10 AM

10

1337.50

XCSE

GENMAB A/S

26-Mar-25

10:27:10 AM

42

1337.50

XCSE

GENMAB A/S

26-Mar-25

10:27:10 AM

12

1337.50

XCSE

GENMAB A/S

26-Mar-25

10:27:46 AM

74

1338.50

CEUX

GENMAB A/S

26-Mar-25

10:29:07 AM

10

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:29:07 AM

30

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:29:07 AM

27

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:29:07 AM

3

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:29:07 AM

23

1338.50

AQEU

GENMAB A/S

26-Mar-25

10:30:35 AM

69

1339.50

XCSE

GENMAB A/S

26-Mar-25

10:30:35 AM

44

1339.50

CEUX

GENMAB A/S

26-Mar-25

10:30:35 AM

28

1339.50

CEUX

GENMAB A/S

26-Mar-25

10:31:01 AM

4

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:31:01 AM

30

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:31:01 AM

72

1338.50

XCSE

7


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

10:31:01 AM

18

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:31:01 AM

42

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:31:01 AM

58

1338.50

CEUX

GENMAB A/S

26-Mar-25

10:31:01 AM

41

1338.50

TQEX

GENMAB A/S

26-Mar-25

10:31:01 AM

32

1339.00

AQEU

GENMAB A/S

26-Mar-25

10:31:06 AM

18

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:31:06 AM

10

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:31:06 AM

35

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:31:26 AM

2

1338.50

XCSE

GENMAB A/S

26-Mar-25

10:32:32 AM

73

1339.50

XCSE

GENMAB A/S

26-Mar-25

10:32:32 AM

30

1339.50

XCSE

GENMAB A/S

26-Mar-25

10:32:32 AM

19

1339.50

XCSE

GENMAB A/S

26-Mar-25

10:32:32 AM

1

1339.50

XCSE

GENMAB A/S

26-Mar-25

10:32:32 AM

29

1339.50

CEUX

GENMAB A/S

26-Mar-25

10:32:32 AM

18

1339.50

CEUX

GENMAB A/S

26-Mar-25

10:32:32 AM

3

1339.50

CEUX

GENMAB A/S

26-Mar-25

10:33:11 AM

12

1340.00

XCSE

GENMAB A/S

26-Mar-25

10:33:11 AM

2

1340.00

XCSE

GENMAB A/S

26-Mar-25

10:33:23 AM

25

1340.00

XCSE

GENMAB A/S

26-Mar-25

10:34:20 AM

71

1340.00

XCSE

GENMAB A/S

26-Mar-25

10:34:20 AM

38

1340.00

CEUX

GENMAB A/S

26-Mar-25

10:34:20 AM

20

1340.00

CEUX

GENMAB A/S

26-Mar-25

10:35:03 AM

1

1340.00

XCSE

GENMAB A/S

26-Mar-25

10:35:03 AM

1

1340.00

XCSE

GENMAB A/S

26-Mar-25

10:36:14 AM

11

1340.50

XCSE

GENMAB A/S

26-Mar-25

10:36:14 AM

26

1340.50

XCSE

GENMAB A/S

26-Mar-25

10:36:14 AM

36

1340.50

XCSE

GENMAB A/S

26-Mar-25

10:36:14 AM

3

1340.50

XCSE

GENMAB A/S

26-Mar-25

10:36:14 AM

11

1340.50

XCSE

GENMAB A/S

26-Mar-25

10:37:11 AM

70

1340.00

XCSE

GENMAB A/S

26-Mar-25

10:37:11 AM

69

1340.00

CEUX

GENMAB A/S

26-Mar-25

10:38:01 AM

37

1339.50

AQEU

GENMAB A/S

26-Mar-25

10:38:01 AM

1

1339.50

AQEU

GENMAB A/S

26-Mar-25

10:38:21 AM

74

1339.50

XCSE

GENMAB A/S

26-Mar-25

10:41:26 AM

2

1341.00

XCSE

GENMAB A/S

26-Mar-25

10:42:17 AM

71

1340.50

XCSE

GENMAB A/S

26-Mar-25

10:42:52 AM

71

1342.00

XCSE

GENMAB A/S

26-Mar-25

10:43:04 AM

10

1341.50

XCSE

GENMAB A/S

26-Mar-25

10:43:04 AM

69

1341.50

CEUX

GENMAB A/S

26-Mar-25

10:43:04 AM

23

1341.50

TQEX

GENMAB A/S

26-Mar-25

10:43:04 AM

26

1341.50

AQEU

GENMAB A/S

26-Mar-25

10:43:11 AM

39

1341.00

XCSE

GENMAB A/S

26-Mar-25

10:43:11 AM

25

1341.00

XCSE

GENMAB A/S

26-Mar-25

10:43:11 AM

25

1341.00

XCSE

GENMAB A/S

26-Mar-25

10:43:11 AM

45

1341.00

XCSE

8


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

10:43:11 AM

3

1341.00

XCSE

GENMAB A/S

26-Mar-25

10:43:11 AM

42

1341.00

XCSE

GENMAB A/S

26-Mar-25

10:43:11 AM

10

1341.00

XCSE

GENMAB A/S

26-Mar-25

10:43:11 AM

42

1341.00

XCSE

GENMAB A/S

26-Mar-25

10:43:11 AM

71

1340.50

CEUX

GENMAB A/S

26-Mar-25

10:43:11 AM

31

1340.50

TQEX

GENMAB A/S

26-Mar-25

10:43:11 AM

24

1340.50

AQEU

GENMAB A/S

26-Mar-25

10:43:59 AM

37

1341.50

XCSE

GENMAB A/S

26-Mar-25

10:43:59 AM

23

1341.50

XCSE

GENMAB A/S

26-Mar-25

10:43:59 AM

42

1341.50

XCSE

GENMAB A/S

26-Mar-25

10:43:59 AM

26

1341.50

XCSE

GENMAB A/S

26-Mar-25

10:43:59 AM

12

1341.50

XCSE

GENMAB A/S

26-Mar-25

10:43:59 AM

11

1341.50

XCSE

GENMAB A/S

26-Mar-25

10:43:59 AM

8

1341.50

XCSE

GENMAB A/S

26-Mar-25

10:44:50 AM

75

1342.00

CEUX

GENMAB A/S

26-Mar-25

10:45:28 AM

25

1342.00

XCSE

GENMAB A/S

26-Mar-25

10:45:31 AM

19

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:45:31 AM

11

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:45:31 AM

11

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:45:31 AM

10

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:45:31 AM

10

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:45:31 AM

23

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:45:31 AM

11

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:45:41 AM

13

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:45:41 AM

22

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:45:56 AM

35

1343.50

XCSE

GENMAB A/S

26-Mar-25

10:45:56 AM

26

1343.50

XCSE

GENMAB A/S

26-Mar-25

10:46:22 AM

71

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:46:22 AM

71

1343.00

CEUX

GENMAB A/S

26-Mar-25

10:46:22 AM

32

1343.00

TQEX

GENMAB A/S

26-Mar-25

10:46:22 AM

24

1343.00

AQEU

GENMAB A/S

26-Mar-25

10:46:23 AM

71

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:46:23 AM

1

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:49:43 AM

26

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:49:43 AM

25

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:49:43 AM

36

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:16 AM

72

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:16 AM

32

1343.00

CEUX

GENMAB A/S

26-Mar-25

10:51:16 AM

71

1343.00

CEUX

GENMAB A/S

26-Mar-25

10:51:16 AM

25

1343.00

TQEX

GENMAB A/S

26-Mar-25

10:51:16 AM

27

1343.00

AQEU

GENMAB A/S

26-Mar-25

10:51:44 AM

23

1342.50

TQEX

GENMAB A/S

26-Mar-25

10:51:47 AM

12

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:47 AM

36

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:47 AM

14

1343.00

XCSE

9


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

10:51:47 AM

19

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:47 AM

1

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:47 AM

2

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:47 AM

10

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:55 AM

3

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:55 AM

10

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:55 AM

42

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:55 AM

10

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:51:55 AM

27

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:52:24 AM

44

1342.00

XCSE

GENMAB A/S

26-Mar-25

10:52:24 AM

21

1342.00

CEUX

GENMAB A/S

26-Mar-25

10:52:24 AM

49

1342.00

CEUX

GENMAB A/S

26-Mar-25

10:52:24 AM

25

1342.00

AQEU

GENMAB A/S

26-Mar-25

10:54:10 AM

2

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:10 AM

27

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:10 AM

42

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:10 AM

10

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:10 AM

4

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:10 AM

9

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:45 AM

19

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:45 AM

17

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:45 AM

2

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:45 AM

12

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:45 AM

10

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:54:56 AM

72

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:55:58 AM

4

1343.00

CEUX

GENMAB A/S

26-Mar-25

10:55:58 AM

1

1343.00

TQEX

GENMAB A/S

26-Mar-25

10:56:02 AM

23

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:56:02 AM

14

1343.00

XCSE

GENMAB A/S

26-Mar-25

10:56:02 AM

37

1343.00

CEUX

GENMAB A/S

26-Mar-25

10:56:02 AM

34

1343.00

CEUX

GENMAB A/S

26-Mar-25

10:56:02 AM

22

1343.00

TQEX

GENMAB A/S

26-Mar-25

10:57:00 AM

23

1342.50

AQEU

GENMAB A/S

26-Mar-25

10:57:25 AM

2

1342.50

XCSE

GENMAB A/S

26-Mar-25

10:58:13 AM

72

1342.00

XCSE

GENMAB A/S

26-Mar-25

10:58:13 AM

25

1342.00

CEUX

GENMAB A/S

26-Mar-25

10:58:13 AM

49

1342.00

CEUX

GENMAB A/S

26-Mar-25

10:58:43 AM

12

1342.00

XCSE

GENMAB A/S

26-Mar-25

10:58:43 AM

23

1342.00

XCSE

GENMAB A/S

26-Mar-25

10:59:26 AM

28

1342.00

XCSE

GENMAB A/S

26-Mar-25

11:00:01 AM

19

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:01 AM

23

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:01 AM

1

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:01 AM

1

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:01 AM

42

1343.00

XCSE

10


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

11:00:01 AM

33

1342.50

TQEX

GENMAB A/S

26-Mar-25

11:00:02 AM

15

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:02 AM

11

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:02 AM

10

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:02 AM

13

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:02 AM

1

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:02 AM

42

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:26 AM

1

1342.50

CEUX

GENMAB A/S

26-Mar-25

11:00:45 AM

12

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:45 AM

13

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:45 AM

12

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:45 AM

65

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:45 AM

12

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:45 AM

4

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:00:45 AM

75

1343.00

CEUX

GENMAB A/S

26-Mar-25

11:02:26 AM

11

1343.00

CEUX

GENMAB A/S

26-Mar-25

11:02:27 AM

47

1342.00

XCSE

GENMAB A/S

26-Mar-25

11:02:27 AM

7

1342.00

XCSE

GENMAB A/S

26-Mar-25

11:02:27 AM

3

1342.00

CEUX

GENMAB A/S

26-Mar-25

11:03:26 AM

12

1342.50

XCSE

GENMAB A/S

26-Mar-25

11:03:26 AM

2

1342.50

XCSE

GENMAB A/S

26-Mar-25

11:03:26 AM

25

1342.50

CEUX

GENMAB A/S

26-Mar-25

11:03:27 AM

1

1342.50

CEUX

GENMAB A/S

26-Mar-25

11:03:35 AM

23

1342.50

TQEX

GENMAB A/S

26-Mar-25

11:03:35 AM

3

1342.50

TQEX

GENMAB A/S

26-Mar-25

11:03:39 AM

15

1342.00

XCSE

GENMAB A/S

26-Mar-25

11:03:39 AM

4

1342.00

CEUX

GENMAB A/S

26-Mar-25

11:03:40 AM

10

1342.00

CEUX

GENMAB A/S

26-Mar-25

11:04:26 AM

1

1342.50

CEUX

GENMAB A/S

26-Mar-25

11:04:52 AM

75

1342.50

XCSE

GENMAB A/S

26-Mar-25

11:04:59 AM

28

1342.50

XCSE

GENMAB A/S

26-Mar-25

11:04:59 AM

40

1342.50

XCSE

GENMAB A/S

26-Mar-25

11:04:59 AM

12

1342.50

XCSE

GENMAB A/S

26-Mar-25

11:05:40 AM

1

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:05:40 AM

12

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:05:40 AM

1

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:05:40 AM

18

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:05:40 AM

12

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:05:40 AM

2

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:05:40 AM

10

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:05:40 AM

18

1343.00

CEUX

GENMAB A/S

26-Mar-25

11:05:41 AM

38

1343.00

XCSE

GENMAB A/S

26-Mar-25

11:05:41 AM

21

1343.00

CEUX

GENMAB A/S

26-Mar-25

11:05:44 AM

11

1343.00

CEUX

GENMAB A/S

26-Mar-25

11:05:50 AM

36

1343.00

CEUX

11


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

11:06:04 AM

21

1343.00

CEUX

GENMAB A/S

26-Mar-25

11:06:37 AM

2

1344.50

XCSE

GENMAB A/S

26-Mar-25

11:06:42 AM

3

1344.50

TQEX

GENMAB A/S

26-Mar-25

11:06:42 AM

7

1344.50

TQEX

GENMAB A/S

26-Mar-25

11:06:42 AM

34

1344.50

TQEX

GENMAB A/S

26-Mar-25

11:08:26 AM

4

1345.00

CEUX

GENMAB A/S

26-Mar-25

11:08:44 AM

14

1346.50

AQEU

GENMAB A/S

26-Mar-25

11:08:48 AM

1

1346.50

AQEU

GENMAB A/S

26-Mar-25

11:08:48 AM

1

1346.50

AQEU

GENMAB A/S

26-Mar-25

11:08:51 AM

13

1346.50

XCSE

GENMAB A/S

26-Mar-25

11:08:51 AM

35

1346.50

XCSE

GENMAB A/S

26-Mar-25

11:08:51 AM

35

1346.50

XCSE

GENMAB A/S

26-Mar-25

11:08:51 AM

59

1346.50

XCSE

GENMAB A/S

26-Mar-25

11:09:12 AM

26

1346.50

AQEU

GENMAB A/S

26-Mar-25

11:09:25 AM

2

1346.50

XCSE

GENMAB A/S

26-Mar-25

11:09:25 AM

1

1346.50

CEUX

GENMAB A/S

26-Mar-25

11:09:26 AM

2

1346.50

XCSE

GENMAB A/S

26-Mar-25

11:09:26 AM

15

1346.50

CEUX

GENMAB A/S

26-Mar-25

11:10:25 AM

5

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:10:25 AM

11

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:10:25 AM

5

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:10:25 AM

23

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:10:37 AM

4

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:10:37 AM

5

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:11:03 AM

1

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:11:20 AM

22

1347.00

XCSE

GENMAB A/S

26-Mar-25

11:11:20 AM

25

1347.00

XCSE

GENMAB A/S

26-Mar-25

11:11:20 AM

2

1347.00

XCSE

GENMAB A/S

26-Mar-25

11:12:55 AM

53

1348.00

XCSE

GENMAB A/S

26-Mar-25

11:12:55 AM

41

1348.00

XCSE

GENMAB A/S

26-Mar-25

11:12:56 AM

78

1348.00

XCSE

GENMAB A/S

26-Mar-25

11:12:56 AM

10

1348.00

XCSE

GENMAB A/S

26-Mar-25

11:12:56 AM

16

1348.00

XCSE

GENMAB A/S

26-Mar-25

11:12:57 AM

9

1348.00

XCSE

GENMAB A/S

26-Mar-25

11:12:58 AM

12

1347.50

XCSE

GENMAB A/S

26-Mar-25

11:12:58 AM

26

1348.00

XCSE

GENMAB A/S

26-Mar-25

11:12:58 AM

26

1347.50

XCSE

GENMAB A/S

26-Mar-25

11:12:58 AM

36

1347.50

CEUX

GENMAB A/S

26-Mar-25

11:12:58 AM

23

1347.50

AQEU

GENMAB A/S

26-Mar-25

11:12:59 AM

24

1347.50

XCSE

GENMAB A/S

26-Mar-25

11:12:59 AM

12

1347.50

XCSE

GENMAB A/S

26-Mar-25

11:12:59 AM

10

1347.50

XCSE

GENMAB A/S

26-Mar-25

11:12:59 AM

22

1347.50

XCSE

GENMAB A/S

26-Mar-25

11:13:05 AM

32

1347.00

XCSE

GENMAB A/S

26-Mar-25

11:13:05 AM

10

1347.50

XCSE

12


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

11:13:05 AM

10

1347.00

XCSE

GENMAB A/S

26-Mar-25

11:13:05 AM

31

1347.00

XCSE

GENMAB A/S

26-Mar-25

11:13:05 AM

11

1347.00

XCSE

GENMAB A/S

26-Mar-25

11:13:05 AM

32

1347.00

XCSE

GENMAB A/S

26-Mar-25

11:13:05 AM

42

1347.00

XCSE

GENMAB A/S

26-Mar-25

11:13:05 AM

5

1347.50

CEUX

GENMAB A/S

26-Mar-25

11:13:05 AM

36

1347.50

CEUX

GENMAB A/S

26-Mar-25

11:13:05 AM

4

1347.50

CEUX

GENMAB A/S

26-Mar-25

11:13:05 AM

7

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:13:05 AM

62

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:13:05 AM

37

1347.00

TQEX

GENMAB A/S

26-Mar-25

11:13:05 AM

2

1347.00

TQEX

GENMAB A/S

26-Mar-25

11:13:07 AM

4

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:13:07 AM

11

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:13:07 AM

4

1347.00

CEUX

GENMAB A/S

26-Mar-25

11:14:23 AM

26

1346.50

CEUX

GENMAB A/S

26-Mar-25

11:14:23 AM

39

1346.50

CEUX

GENMAB A/S

26-Mar-25

11:14:45 AM

12

1346.50

XCSE

GENMAB A/S

26-Mar-25

11:14:45 AM

2

1346.50

XCSE

GENMAB A/S

26-Mar-25

11:16:26 AM

1

1346.50

CEUX

GENMAB A/S

26-Mar-25

11:18:27 AM

71

1348.00

XCSE

GENMAB A/S

26-Mar-25

11:18:27 AM

42

1348.50

XCSE

GENMAB A/S

26-Mar-25

11:18:27 AM

12

1348.50

XCSE

GENMAB A/S

26-Mar-25

11:18:27 AM

7

1348.50

XCSE

GENMAB A/S

26-Mar-25

11:18:27 AM

10

1348.50

XCSE

GENMAB A/S

26-Mar-25

11:18:27 AM

5

1348.50

CEUX

GENMAB A/S

26-Mar-25

11:18:27 AM

12

1348.00

CEUX

GENMAB A/S

26-Mar-25

11:18:27 AM

4

1348.50

CEUX

GENMAB A/S

26-Mar-25

11:18:27 AM

63

1348.00

CEUX

GENMAB A/S

26-Mar-25

11:18:38 AM

4

1349.00

XCSE

GENMAB A/S

26-Mar-25

11:19:00 AM

61

1348.50

XCSE

GENMAB A/S

26-Mar-25

11:19:54 AM

10

1349.50

CEUX

GENMAB A/S

26-Mar-25

11:19:54 AM

64

1349.50

CEUX

GENMAB A/S

26-Mar-25

11:19:54 AM

2

1349.50

CEUX

GENMAB A/S

26-Mar-25

11:19:54 AM

1

1349.50

CEUX

GENMAB A/S

26-Mar-25

11:19:54 AM

17

1349.50

CEUX

GENMAB A/S

26-Mar-25

11:19:58 AM

13

1350.50

CEUX

GENMAB A/S

26-Mar-25

11:19:58 AM

8

1350.50

CEUX

GENMAB A/S

26-Mar-25

11:20:01 AM

71

1350.50

XCSE

GENMAB A/S

26-Mar-25

11:21:30 AM

42

1351.00

XCSE

GENMAB A/S

26-Mar-25

11:21:30 AM

23

1351.00

CEUX

GENMAB A/S

26-Mar-25

11:21:30 AM

8

1351.00

CEUX

GENMAB A/S

26-Mar-25

11:22:34 AM

9

1351.50

CEUX

GENMAB A/S

26-Mar-25

11:22:34 AM

16

1351.50

CEUX

GENMAB A/S

26-Mar-25

11:22:34 AM

30

1351.50

CEUX

13


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

11:22:34 AM

1

1351.50

CEUX

GENMAB A/S

26-Mar-25

11:23:36 AM

35

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:36 AM

42

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:36 AM

8

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:36 AM

9

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:37 AM

11

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:37 AM

10

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:37 AM

15

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:37 AM

2

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:37 AM

42

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:37 AM

10

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:37 AM

12

1352.00

CEUX

GENMAB A/S

26-Mar-25

11:23:38 AM

17

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:38 AM

14

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:39 AM

12

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:39 AM

16

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:40 AM

9

1352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:40 AM

16

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:40 AM

17

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:41 AM

10

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:41 AM

11

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:42 AM

15

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:42 AM

7

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:23:42 AM

24

1,352.00

TQEX

GENMAB A/S

26-Mar-25

11:24:25 AM

36

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:24:26 AM

13

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:24:26 AM

1

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:24:26 AM

1

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:24:41 AM

36

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:25:00 AM

32

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:25:53 AM

11

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:25:53 AM

43

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:25:53 AM

1

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:25:53 AM

27

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:25:54 AM

71

1,351.00

XCSE

GENMAB A/S

26-Mar-25

11:26:00 AM

20

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:26:00 AM

17

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:26:25 AM

42

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:26:25 AM

10

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:26:26 AM

2

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:26:31 AM

11

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:26:38 AM

15

1,352.50

XCSE

GENMAB A/S

26-Mar-25

11:26:38 AM

35

1,352.50

XCSE

GENMAB A/S

26-Mar-25

11:26:38 AM

27

1,352.50

XCSE

GENMAB A/S

26-Mar-25

11:26:38 AM

2

1,352.50

XCSE

14


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

11:26:46 AM

36

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:26:47 AM

5

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:26:54 AM

5

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:26:54 AM

5

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:26:54 AM

12

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:27:15 AM

23

1,352.00

XCSE

GENMAB A/S

26-Mar-25

11:27:27 AM

70

1,351.00

XCSE

GENMAB A/S

26-Mar-25

11:27:27 AM

74

1,349.50

XCSE

GENMAB A/S

26-Mar-25

11:27:27 AM

70

1,351.00

CEUX

GENMAB A/S

26-Mar-25

11:27:27 AM

29

1,351.00

TQEX

GENMAB A/S

26-Mar-25

11:27:27 AM

24

1,351.00

AQEU

GENMAB A/S

26-Mar-25

11:27:31 AM

23

1,351.00

TQEX

GENMAB A/S

26-Mar-25

11:28:25 AM

72

1,350.50

XCSE

GENMAB A/S

26-Mar-25

11:28:40 AM

9

1,348.50

XCSE

GENMAB A/S

26-Mar-25

11:28:40 AM

69

1,349.50

XCSE

GENMAB A/S

26-Mar-25

11:28:40 AM

69

1,350.00

CEUX

GENMAB A/S

26-Mar-25

11:28:40 AM

28

1,350.00

TQEX

GENMAB A/S

26-Mar-25

11:28:40 AM

23

1,350.00

AQEU

GENMAB A/S

26-Mar-25

11:29:11 AM

67

1,348.00

XCSE

GENMAB A/S

26-Mar-25

11:29:11 AM

67

1,349.00

XCSE

GENMAB A/S

26-Mar-25

11:29:11 AM

1

1,348.50

CEUX

GENMAB A/S

26-Mar-25

11:29:11 AM

71

1,348.50

CEUX

GENMAB A/S

26-Mar-25

11:29:15 AM

74

1,347.50

CEUX

GENMAB A/S

26-Mar-25

11:29:15 AM

26

1,348.00

AQEU

GENMAB A/S

26-Mar-25

11:29:56 AM

75

1,347.00

XCSE

GENMAB A/S

26-Mar-25

11:30:36 AM

49

1,348.00

CEUX

GENMAB A/S

26-Mar-25

11:32:07 AM

22

1,348.00

CEUX

GENMAB A/S

26-Mar-25

11:34:05 AM

3

1,348.00

XCSE

GENMAB A/S

26-Mar-25

11:34:05 AM

37

1,348.00

XCSE

GENMAB A/S

26-Mar-25

11:34:05 AM

4

1,348.00

XCSE

GENMAB A/S

26-Mar-25

11:34:35 AM

1

1,348.00

XCSE

GENMAB A/S

26-Mar-25

11:34:35 AM

12

1,348.00

XCSE

GENMAB A/S

26-Mar-25

11:34:45 AM

12

1,348.00

XCSE

GENMAB A/S

26-Mar-25

11:34:55 AM

12

1,348.00

XCSE

GENMAB A/S

26-Mar-25

11:37:25 AM

53

1,348.50

XCSE

GENMAB A/S

26-Mar-25

11:37:25 AM

18

1,348.50

XCSE

GENMAB A/S

26-Mar-25

11:37:25 AM

2

1,348.00

XCSE

GENMAB A/S

26-Mar-25

11:37:25 AM

18

1,348.50

CEUX

GENMAB A/S

26-Mar-25

11:37:25 AM

22

1,348.50

CEUX

GENMAB A/S

26-Mar-25

11:37:25 AM

34

1,348.50

CEUX

GENMAB A/S

26-Mar-25

11:39:05 AM

17

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:39:05 AM

40

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:39:05 AM

37

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:39:19 AM

1

1,351.00

CEUX

GENMAB A/S

26-Mar-25

11:39:19 AM

10

1,351.00

CEUX

15


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

11:39:19 AM

58

1,351.00

CEUX

GENMAB A/S

26-Mar-25

11:39:24 AM

46

1,351.00

XCSE

GENMAB A/S

26-Mar-25

11:39:34 AM

7

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:39:35 AM

10

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:39:35 AM

18

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:40:41 AM

12

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:40:41 AM

3

1,351.50

XCSE

GENMAB A/S

26-Mar-25

11:42:25 AM

33

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:42:25 AM

16

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:42:25 AM

1

1,352.00

CEUX

GENMAB A/S

26-Mar-25

11:42:45 AM

59

1,354.50

XCSE

GENMAB A/S

26-Mar-25

11:42:45 AM

35

1,354.50

XCSE

GENMAB A/S

26-Mar-25

11:42:46 AM

47

1,354.50

XCSE

GENMAB A/S

26-Mar-25

11:43:10 AM

13

1,355.00

CEUX

GENMAB A/S

26-Mar-25

11:43:45 AM

5

1,355.00

CEUX

GENMAB A/S

26-Mar-25

11:43:45 AM

13

1,355.00

CEUX

GENMAB A/S

26-Mar-25

11:43:45 AM

5

1,355.00

CEUX

GENMAB A/S

26-Mar-25

11:44:14 AM

69

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:14 AM

25

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:14 AM

1

1,355.00

CEUX

GENMAB A/S

26-Mar-25

11:44:15 AM

48

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:15 AM

16

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:15 AM

78

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:15 AM

21

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:15 AM

25

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:15 AM

4

1,355.00

CEUX

GENMAB A/S

26-Mar-25

11:44:15 AM

4

1,355.00

CEUX

GENMAB A/S

26-Mar-25

11:44:15 AM

2

1,355.50

CEUX

GENMAB A/S

26-Mar-25

11:44:15 AM

43

1,355.00

TQEX

GENMAB A/S

26-Mar-25

11:44:16 AM

23

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:34 AM

23

1,355.00

CEUX

GENMAB A/S

26-Mar-25

11:44:35 AM

21

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:35 AM

2

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:55 AM

7

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:44:55 AM

25

1,355.00

XCSE

GENMAB A/S

26-Mar-25

11:45:13 AM

59

1,354.50

XCSE

GENMAB A/S

26-Mar-25

11:45:13 AM

13

1,354.50

XCSE

GENMAB A/S

26-Mar-25

11:45:13 AM

17

1,354.50

CEUX

GENMAB A/S

26-Mar-25

11:45:13 AM

56

1,354.50

CEUX

GENMAB A/S

26-Mar-25

11:45:13 AM

30

1,354.00

TQEX

GENMAB A/S

26-Mar-25

11:45:13 AM

32

1,354.50

AQEU

GENMAB A/S

26-Mar-25

11:45:19 AM

23

1,353.50

XCSE

GENMAB A/S

26-Mar-25

11:45:22 AM

51

1,353.50

XCSE

GENMAB A/S

26-Mar-25

11:45:22 AM

74

1,353.50

CEUX

GENMAB A/S

26-Mar-25

11:45:22 AM

4

1,354.00

TQEX

16


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

11:45:22 AM

32

1,353.50

AQEU

GENMAB A/S

26-Mar-25

11:48:38 AM

7

1,354.00

XCSE

GENMAB A/S

26-Mar-25

11:49:43 AM

4

1,354.50

CEUX

GENMAB A/S

26-Mar-25

11:50:14 AM

32

1,354.50

CEUX

GENMAB A/S

26-Mar-25

11:51:29 AM

3

1,356.50

CEUX

GENMAB A/S

26-Mar-25

11:51:48 AM

2

1,357.00

XCSE

GENMAB A/S

26-Mar-25

11:51:48 AM

50

1,357.00

XCSE

GENMAB A/S

26-Mar-25

11:51:48 AM

29

1,357.00

XCSE

GENMAB A/S

26-Mar-25

11:51:48 AM

72

1,356.50

CEUX

GENMAB A/S

26-Mar-25

11:51:48 AM

26

1,356.50

TQEX

GENMAB A/S

26-Mar-25

11:51:51 AM

70

1,357.00

CEUX

GENMAB A/S

26-Mar-25

11:51:51 AM

29

1,357.00

TQEX

GENMAB A/S

26-Mar-25

11:52:05 AM

15

1,357.50

XCSE

GENMAB A/S

26-Mar-25

11:52:05 AM

7

1,357.50

XCSE

GENMAB A/S

26-Mar-25

11:53:44 AM

75

1,359.00

CEUX

GENMAB A/S

26-Mar-25

11:53:45 AM

29

1,359.50

XCSE

GENMAB A/S

26-Mar-25

11:53:50 AM

50

1,359.50

XCSE

GENMAB A/S

26-Mar-25

11:53:53 AM

50

1,359.50

XCSE

GENMAB A/S

26-Mar-25

11:53:58 AM

54

1,359.50

XCSE

GENMAB A/S

26-Mar-25

11:53:58 AM

18

1,359.50

XCSE

GENMAB A/S

26-Mar-25

11:53:58 AM

23

1,359.50

TQEX

GENMAB A/S

26-Mar-25

11:54:04 AM

11

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:54:04 AM

10

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:54:04 AM

42

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:54:04 AM

10

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:54:07 AM

50

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:54:17 AM

70

1,361.00

CEUX

GENMAB A/S

26-Mar-25

11:54:21 AM

62

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:54:25 AM

37

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:54:55 AM

7

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:54:55 AM

2

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:55:25 AM

1

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:55:25 AM

24

1,361.00

XCSE

GENMAB A/S

26-Mar-25

11:55:43 AM

24

1,361.50

XCSE

GENMAB A/S

26-Mar-25

11:55:43 AM

18

1,361.50

XCSE

GENMAB A/S

26-Mar-25

11:55:43 AM

23

1,361.50

XCSE

GENMAB A/S

26-Mar-25

11:55:43 AM

21

1,361.50

XCSE

GENMAB A/S

26-Mar-25

11:55:58 AM

70

1,360.50

XCSE

GENMAB A/S

26-Mar-25

11:55:58 AM

1

1,360.50

XCSE

GENMAB A/S

26-Mar-25

11:55:58 AM

55

1,360.50

AQEU

GENMAB A/S

26-Mar-25

11:57:30 AM

75

1,359.50

XCSE

GENMAB A/S

26-Mar-25

11:57:30 AM

69

1,360.00

CEUX

GENMAB A/S

26-Mar-25

11:57:30 AM

23

1,360.50

TQEX

GENMAB A/S

26-Mar-25

11:57:30 AM

50

1,359.50

AQEU

GENMAB A/S

26-Mar-25

11:57:30 AM

56

1,360.50

AQEU

17


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

11:59:25 AM

11

1,359.50

XCSE

GENMAB A/S

26-Mar-25

11:59:25 AM

10

1,359.50

XCSE

GENMAB A/S

26-Mar-25

11:59:26 AM

1

1,359.50

XCSE

GENMAB A/S

26-Mar-25

11:59:35 AM

18

1,360.00

XCSE

GENMAB A/S

26-Mar-25

11:59:35 AM

22

1,360.00

XCSE

GENMAB A/S

26-Mar-25

11:59:35 AM

10

1,360.00

XCSE

GENMAB A/S

26-Mar-25

11:59:35 AM

10

1,360.00

XCSE

GENMAB A/S

26-Mar-25

12:01:26 PM

1

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:02:02 PM

12

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:02:26 PM

2

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:02:26 PM

1

1,363.00

CEUX

GENMAB A/S

26-Mar-25

12:03:26 PM

1

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:03:26 PM

2

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:03:27 PM

4

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:03:27 PM

2

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:03:45 PM

42

1,362.50

TQEX

GENMAB A/S

26-Mar-25

12:03:58 PM

10

1,362.50

XCSE

GENMAB A/S

26-Mar-25

12:03:58 PM

12

1,362.50

CEUX

GENMAB A/S

26-Mar-25

12:03:58 PM

4

1,362.50

CEUX

GENMAB A/S

26-Mar-25

12:04:26 PM

1

1,362.50

CEUX

GENMAB A/S

26-Mar-25

12:04:27 PM

11

1,362.50

XCSE

GENMAB A/S

26-Mar-25

12:04:27 PM

10

1,362.50

XCSE

GENMAB A/S

26-Mar-25

12:04:27 PM

31

1,362.50

CEUX

GENMAB A/S

26-Mar-25

12:05:25 PM

1

1,362.50

XCSE

GENMAB A/S

26-Mar-25

12:05:25 PM

1

1,362.50

XCSE

GENMAB A/S

26-Mar-25

12:05:25 PM

1

1,362.50

XCSE

GENMAB A/S

26-Mar-25

12:05:25 PM

1

1,362.50

CEUX

GENMAB A/S

26-Mar-25

12:05:26 PM

4

1,362.50

XCSE

GENMAB A/S

26-Mar-25

12:06:25 PM

1

1,362.50

XCSE

GENMAB A/S

26-Mar-25

12:06:34 PM

1

1,363.00

CEUX

GENMAB A/S

26-Mar-25

12:06:34 PM

18

1,363.00

CEUX

GENMAB A/S

26-Mar-25

12:06:40 PM

12

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:06:40 PM

22

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:06:40 PM

36

1,363.00

CEUX

GENMAB A/S

26-Mar-25

12:06:40 PM

24

1,363.00

CEUX

GENMAB A/S

26-Mar-25

12:06:40 PM

26

1,362.50

TQEX

GENMAB A/S

26-Mar-25

12:07:09 PM

12

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:07:09 PM

35

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:07:09 PM

17

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:07:09 PM

30

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:07:09 PM

5

1,363.00

CEUX

GENMAB A/S

26-Mar-25

12:07:10 PM

34

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:07:10 PM

39

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:07:10 PM

12

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:07:10 PM

11

1,363.00

XCSE

18


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

12:07:10 PM

10

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:07:10 PM

10

1,363.00

XCSE

GENMAB A/S

26-Mar-25

12:07:18 PM

70

1,364.00

CEUX

GENMAB A/S

26-Mar-25

12:07:19 PM

30

1,364.50

XCSE

GENMAB A/S

26-Mar-25

12:07:19 PM

71

1,364.50

CEUX

GENMAB A/S

26-Mar-25

12:07:21 PM

70

1,364.00

CEUX

GENMAB A/S

26-Mar-25

12:08:52 PM

71

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:08:52 PM

69

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:08:52 PM

73

1,370.00

AQEU

GENMAB A/S

26-Mar-25

12:08:53 PM

33

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:08:53 PM

50

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:08:54 PM

18

1,370.50

XCSE

GENMAB A/S

26-Mar-25

12:08:54 PM

1

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:09:01 PM

69

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:09:01 PM

72

1,371.00

CEUX

GENMAB A/S

26-Mar-25

12:09:01 PM

74

1,370.50

AQEU

GENMAB A/S

26-Mar-25

12:09:02 PM

75

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:09:02 PM

74

1,370.00

CEUX

GENMAB A/S

26-Mar-25

12:09:04 PM

13

1,369.00

XCSE

GENMAB A/S

26-Mar-25

12:09:04 PM

69

1,369.50

AQEU

GENMAB A/S

26-Mar-25

12:09:06 PM

60

1,369.00

XCSE

GENMAB A/S

26-Mar-25

12:09:06 PM

74

1,369.00

CEUX

GENMAB A/S

26-Mar-25

12:09:06 PM

1

1,369.00

CEUX

GENMAB A/S

26-Mar-25

12:13:05 PM

10

1,372.00

XCSE

GENMAB A/S

26-Mar-25

12:13:49 PM

11

1,372.00

XCSE

GENMAB A/S

26-Mar-25

12:13:52 PM

11

1,372.00

XCSE

GENMAB A/S

26-Mar-25

12:13:52 PM

11

1,372.00

XCSE

GENMAB A/S

26-Mar-25

12:13:52 PM

28

1,371.50

AQEU

GENMAB A/S

26-Mar-25

12:13:59 PM

17

1,372.00

XCSE

GENMAB A/S

26-Mar-25

12:14:07 PM

74

1,372.00

XCSE

GENMAB A/S

26-Mar-25

12:14:07 PM

62

1,372.00

CEUX

GENMAB A/S

26-Mar-25

12:14:07 PM

23

1,372.00

TQEX

GENMAB A/S

26-Mar-25

12:14:27 PM

70

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:14:27 PM

24

1,370.50

CEUX

GENMAB A/S

26-Mar-25

12:14:27 PM

45

1,370.50

AQEU

GENMAB A/S

26-Mar-25

12:14:27 PM

17

1,371.50

AQEU

GENMAB A/S

26-Mar-25

12:15:25 PM

69

1,369.50

XCSE

GENMAB A/S

26-Mar-25

12:15:25 PM

28

1,369.50

CEUX

GENMAB A/S

26-Mar-25

12:17:25 PM

3

1,371.50

XCSE

GENMAB A/S

26-Mar-25

12:17:25 PM

2

1,371.50

XCSE

GENMAB A/S

26-Mar-25

12:17:25 PM

2

1,371.50

XCSE

GENMAB A/S

26-Mar-25

12:17:26 PM

38

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:17:26 PM

37

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:17:26 PM

39

1,371.00

CEUX

GENMAB A/S

26-Mar-25

12:17:26 PM

25

1,370.50

AQEU

19


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

12:18:04 PM

14

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:18:04 PM

59

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:18:04 PM

20

1,370.00

CEUX

GENMAB A/S

26-Mar-25

12:18:04 PM

18

1,370.00

CEUX

GENMAB A/S

26-Mar-25

12:18:04 PM

41

1,369.50

AQEU

GENMAB A/S

26-Mar-25

12:18:07 PM

6

1,369.00

XCSE

GENMAB A/S

26-Mar-25

12:18:07 PM

68

1,369.00

XCSE

GENMAB A/S

26-Mar-25

12:18:11 PM

44

1,368.50

CEUX

GENMAB A/S

26-Mar-25

12:18:11 PM

26

1,368.50

TQEX

GENMAB A/S

26-Mar-25

12:21:00 PM

23

1,370.00

AQEU

GENMAB A/S

26-Mar-25

12:21:25 PM

2

1,369.50

XCSE

GENMAB A/S

26-Mar-25

12:21:25 PM

70

1,369.50

XCSE

GENMAB A/S

26-Mar-25

12:21:25 PM

14

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:21:25 PM

2

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:21:25 PM

7

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:21:25 PM

46

1,369.50

CEUX

GENMAB A/S

26-Mar-25

12:21:51 PM

1

1,368.50

XCSE

GENMAB A/S

26-Mar-25

12:21:51 PM

4

1,368.50

CEUX

GENMAB A/S

26-Mar-25

12:25:25 PM

23

1,369.00

TQEX

GENMAB A/S

26-Mar-25

12:25:26 PM

2

1,369.50

XCSE

GENMAB A/S

26-Mar-25

12:25:26 PM

1

1,369.50

XCSE

GENMAB A/S

26-Mar-25

12:27:26 PM

75

1,370.00

XCSE

GENMAB A/S

26-Mar-25

12:27:26 PM

23

1,370.00

AQEU

GENMAB A/S

26-Mar-25

12:28:07 PM

6

1,370.50

XCSE

GENMAB A/S

26-Mar-25

12:28:07 PM

11

1,370.50

XCSE

GENMAB A/S

26-Mar-25

12:28:26 PM

1

1,370.50

XCSE

GENMAB A/S

26-Mar-25

12:29:53 PM

3

1,370.00

AQEU

GENMAB A/S

26-Mar-25

12:30:08 PM

1

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:08 PM

30

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:08 PM

30

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:08 PM

1

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:08 PM

11

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:08 PM

27

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:08 PM

10

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:08 PM

2

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:08 PM

43

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:08 PM

10

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:09 PM

11

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:09 PM

12

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:09 PM

12

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:09 PM

34

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:09 PM

12

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:09 PM

30

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:09 PM

30

1,371.00

XCSE

GENMAB A/S

26-Mar-25

12:30:22 PM

73

1,369.50

XCSE

20


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

12:30:22 PM

75

1,369.50

CEUX

GENMAB A/S

26-Mar-25

12:30:22 PM

41

1,369.50

TQEX

GENMAB A/S

26-Mar-25

12:30:45 PM

72

1,368.50

XCSE

GENMAB A/S

26-Mar-25

12:30:45 PM

38

1,368.50

CEUX

GENMAB A/S

26-Mar-25

12:30:47 PM

74

1,367.50

XCSE

GENMAB A/S

26-Mar-25

12:30:47 PM

40

1,367.50

CEUX

GENMAB A/S

26-Mar-25

12:30:55 PM

75

1,366.50

XCSE

GENMAB A/S

26-Mar-25

12:30:55 PM

73

1,366.50

CEUX

GENMAB A/S

26-Mar-25

12:30:57 PM

70

1,365.50

XCSE

GENMAB A/S

26-Mar-25

12:30:57 PM

75

1,365.50

CEUX

GENMAB A/S

26-Mar-25

12:31:29 PM

20

1,364.00

XCSE

GENMAB A/S

26-Mar-25

12:31:29 PM

35

1,365.00

XCSE

GENMAB A/S

26-Mar-25

12:31:29 PM

14

1,364.50

CEUX

GENMAB A/S

26-Mar-25

12:31:29 PM

35

1,364.50

CEUX

GENMAB A/S

26-Mar-25

12:36:45 PM

1

1,366.00

XCSE

GENMAB A/S

26-Mar-25

12:36:45 PM

11

1,366.00

XCSE

GENMAB A/S

26-Mar-25

12:36:45 PM

1

1,366.00

XCSE

GENMAB A/S

26-Mar-25

12:37:20 PM

23

1,365.00

XCSE

GENMAB A/S

26-Mar-25

12:37:20 PM

23

1,365.50

CEUX

GENMAB A/S

26-Mar-25

12:37:20 PM

40

1,365.00

TQEX

GENMAB A/S

26-Mar-25

12:37:20 PM

26

1,365.50

AQEU

GENMAB A/S

26-Mar-25

12:38:17 PM

24

1,365.00

AQEU

GENMAB A/S

26-Mar-25

12:38:37 PM

10

1,365.00

XCSE

GENMAB A/S

26-Mar-25

12:38:37 PM

30

1,365.00

XCSE

GENMAB A/S

26-Mar-25

12:38:37 PM

42

1,365.00

XCSE

GENMAB A/S

26-Mar-25

12:38:37 PM

12

1,365.00

XCSE

GENMAB A/S

26-Mar-25

12:38:37 PM

27

1,364.50

CEUX

GENMAB A/S

26-Mar-25

12:38:37 PM

14

1,364.50

CEUX

GENMAB A/S

26-Mar-25

12:39:10 PM

3

1,365.50

XCSE

GENMAB A/S

26-Mar-25

12:39:14 PM

1

1365.50

XCSE

GENMAB A/S

26-Mar-25

12:40:26 PM

63

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:40:26 PM

12

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:40:35 PM

2

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:40:35 PM

94

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:41:16 PM

74

1365.00

XCSE

GENMAB A/S

26-Mar-25

12:41:21 PM

52

1364.00

XCSE

GENMAB A/S

26-Mar-25

12:41:21 PM

58

1364.00

CEUX

GENMAB A/S

26-Mar-25

12:41:21 PM

40

1364.00

TQEX

GENMAB A/S

26-Mar-25

12:41:21 PM

27

1364.00

AQEU

GENMAB A/S

26-Mar-25

12:43:51 PM

23

1365.00

XCSE

GENMAB A/S

26-Mar-25

12:43:51 PM

75

1365.00

XCSE

GENMAB A/S

26-Mar-25

12:43:51 PM

74

1365.00

CEUX

GENMAB A/S

26-Mar-25

12:45:47 PM

47

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:45:47 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:45:47 PM

1

1367.00

XCSE

21


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

12:45:47 PM

26

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:45:47 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:47:15 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:47:15 PM

42

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:47:15 PM

8

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:47:15 PM

71

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:47:15 PM

19

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:47:15 PM

2

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:47:15 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

12:47:15 PM

69

1366.00

CEUX

GENMAB A/S

26-Mar-25

12:47:15 PM

42

1365.50

AQEU

GENMAB A/S

26-Mar-25

12:48:26 PM

74

1366.50

CEUX

GENMAB A/S

26-Mar-25

12:48:27 PM

20

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:48:27 PM

49

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:48:42 PM

6

1365.50

TQEX

GENMAB A/S

26-Mar-25

12:49:35 PM

73

1365.00

XCSE

GENMAB A/S

26-Mar-25

12:52:26 PM

42

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:52:26 PM

12

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:52:26 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:52:26 PM

19

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:53:23 PM

71

1366.00

CEUX

GENMAB A/S

26-Mar-25

12:53:26 PM

1

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:54:25 PM

2

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:54:25 PM

75

1365.50

XCSE

GENMAB A/S

26-Mar-25

12:54:25 PM

21

1365.00

XCSE

GENMAB A/S

26-Mar-25

12:54:25 PM

42

1365.00

XCSE

GENMAB A/S

26-Mar-25

12:54:25 PM

37

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:54:25 PM

10

1365.00

XCSE

GENMAB A/S

26-Mar-25

12:54:25 PM

13

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:54:25 PM

42

1365.50

XCSE

GENMAB A/S

26-Mar-25

12:54:25 PM

67

1365.00

CEUX

GENMAB A/S

26-Mar-25

12:54:25 PM

30

1365.50

TQEX

GENMAB A/S

26-Mar-25

12:54:25 PM

41

1365.50

AQEU

GENMAB A/S

26-Mar-25

12:55:40 PM

44

1365.00

XCSE

GENMAB A/S

26-Mar-25

12:58:47 PM

23

1365.50

TQEX

GENMAB A/S

26-Mar-25

12:59:10 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:59:10 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:59:10 PM

12

1366.00

XCSE

GENMAB A/S

26-Mar-25

12:59:37 PM

71

1366.00

XCSE

GENMAB A/S

26-Mar-25

1:00:14 PM

4

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:00:14 PM

1

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:00:14 PM

42

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:00:14 PM

70

1366.00

CEUX

GENMAB A/S

26-Mar-25

1:00:14 PM

41

1366.50

TQEX

GENMAB A/S

26-Mar-25

1:01:14 PM

74

1368.00

XCSE

22


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

1:01:14 PM

73

1368.00

CEUX

GENMAB A/S

26-Mar-25

1:02:24 PM

42

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:02:26 PM

27

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:02:57 PM

69

1368.00

CEUX

GENMAB A/S

26-Mar-25

1:03:24 PM

21

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:03:24 PM

30

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:03:24 PM

15

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:03:24 PM

28

1367.50

AQEU

GENMAB A/S

26-Mar-25

1:03:26 PM

72

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:03:26 PM

1

1367.00

CEUX

GENMAB A/S

26-Mar-25

1:03:26 PM

70

1367.00

CEUX

GENMAB A/S

26-Mar-25

1:04:06 PM

6

1366.00

XCSE

GENMAB A/S

26-Mar-25

1:04:06 PM

69

1366.00

XCSE

GENMAB A/S

26-Mar-25

1:04:06 PM

72

1366.00

CEUX

GENMAB A/S

26-Mar-25

1:04:08 PM

71

1365.50

XCSE

GENMAB A/S

26-Mar-25

1:08:53 PM

25

1369.50

XCSE

GENMAB A/S

26-Mar-25

1:08:53 PM

10

1369.50

XCSE

GENMAB A/S

26-Mar-25

1:08:56 PM

72

1369.50

CEUX

GENMAB A/S

26-Mar-25

1:09:58 PM

34

1370.50

XCSE

GENMAB A/S

26-Mar-25

1:09:58 PM

42

1370.50

XCSE

GENMAB A/S

26-Mar-25

1:09:58 PM

18

1370.50

XCSE

GENMAB A/S

26-Mar-25

1:10:00 PM

75

1370.00

XCSE

GENMAB A/S

26-Mar-25

1:10:00 PM

36

1369.50

CEUX

GENMAB A/S

26-Mar-25

1:10:00 PM

23

1370.00

TQEX

GENMAB A/S

26-Mar-25

1:10:00 PM

25

1370.00

AQEU

GENMAB A/S

26-Mar-25

1:10:01 PM

75

1369.00

XCSE

GENMAB A/S

26-Mar-25

1:10:03 PM

9

1369.00

AQEU

GENMAB A/S

26-Mar-25

1:10:03 PM

18

1369.00

AQEU

GENMAB A/S

26-Mar-25

1:10:35 PM

35

1368.50

CEUX

GENMAB A/S

26-Mar-25

1:10:35 PM

34

1368.50

CEUX

GENMAB A/S

26-Mar-25

1:10:45 PM

74

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:11:14 PM

69

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:11:18 PM

66

1371.50

XCSE

GENMAB A/S

26-Mar-25

1:11:18 PM

48

1372.00

CEUX

GENMAB A/S

26-Mar-25

1:11:21 PM

23

1372.50

XCSE

GENMAB A/S

26-Mar-25

1:12:10 PM

51

1373.50

XCSE

GENMAB A/S

26-Mar-25

1:12:10 PM

28

1373.00

CEUX

GENMAB A/S

26-Mar-25

1:12:24 PM

43

1372.50

XCSE

GENMAB A/S

26-Mar-25

1:12:24 PM

29

1372.00

CEUX

GENMAB A/S

26-Mar-25

1:12:27 PM

50

1371.50

XCSE

GENMAB A/S

26-Mar-25

1:12:27 PM

44

1371.00

CEUX

GENMAB A/S

26-Mar-25

1:12:32 PM

25

1371.50

XCSE

GENMAB A/S

26-Mar-25

1:12:54 PM

41

1370.50

CEUX

GENMAB A/S

26-Mar-25

1:15:58 PM

5

1371.50

CEUX

GENMAB A/S

26-Mar-25

1:15:58 PM

18

1371.50

CEUX

23


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

1:16:13 PM

27

1372.50

TQEX

GENMAB A/S

26-Mar-25

1:19:25 PM

3

1372.50

XCSE

GENMAB A/S

26-Mar-25

1:19:25 PM

4

1372.50

XCSE

GENMAB A/S

26-Mar-25

1:19:48 PM

30

1373.00

XCSE

GENMAB A/S

26-Mar-25

1:19:48 PM

17

1373.00

XCSE

GENMAB A/S

26-Mar-25

1:20:25 PM

1

1372.50

XCSE

GENMAB A/S

26-Mar-25

1:20:25 PM

1

1372.50

XCSE

GENMAB A/S

26-Mar-25

1:20:25 PM

10

1372.50

XCSE

GENMAB A/S

26-Mar-25

1:20:42 PM

2

1373.50

XCSE

GENMAB A/S

26-Mar-25

1:20:42 PM

15

1373.50

XCSE

GENMAB A/S

26-Mar-25

1:21:06 PM

12

1373.50

XCSE

GENMAB A/S

26-Mar-25

1:21:06 PM

10

1373.50

XCSE

GENMAB A/S

26-Mar-25

1:21:55 PM

73

1373.00

XCSE

GENMAB A/S

26-Mar-25

1:21:55 PM

42

1373.00

XCSE

GENMAB A/S

26-Mar-25

1:21:55 PM

17

1373.00

XCSE

GENMAB A/S

26-Mar-25

1:21:55 PM

35

1373.00

XCSE

GENMAB A/S

26-Mar-25

1:21:55 PM

61

1373.00

CEUX

GENMAB A/S

26-Mar-25

1:21:55 PM

28

1373.00

AQEU

GENMAB A/S

26-Mar-25

1:21:56 PM

69

1372.00

XCSE

GENMAB A/S

26-Mar-25

1:21:56 PM

20

1372.00

CEUX

GENMAB A/S

26-Mar-25

1:21:56 PM

3

1372.00

CEUX

GENMAB A/S

26-Mar-25

1:21:56 PM

23

1372.00

TQEX

GENMAB A/S

26-Mar-25

1:21:56 PM

26

1372.00

AQEU

GENMAB A/S

26-Mar-25

1:22:15 PM

70

1372.00

XCSE

GENMAB A/S

26-Mar-25

1:22:15 PM

26

1372.00

TQEX

GENMAB A/S

26-Mar-25

1:23:25 PM

49

1372.50

CEUX

GENMAB A/S

26-Mar-25

1:24:24 PM

71

1372.00

XCSE

GENMAB A/S

26-Mar-25

1:25:41 PM

23

1372.00

AQEU

GENMAB A/S

26-Mar-25

1:26:18 PM

73

1372.00

XCSE

GENMAB A/S

26-Mar-25

1:26:35 PM

9

1371.50

CEUX

GENMAB A/S

26-Mar-25

1:26:37 PM

38

1371.50

CEUX

GENMAB A/S

26-Mar-25

1:26:49 PM

60

1371.00

XCSE

GENMAB A/S

26-Mar-25

1:26:49 PM

43

1371.00

TQEX

GENMAB A/S

26-Mar-25

1:26:50 PM

75

1370.00

XCSE

GENMAB A/S

26-Mar-25

1:26:50 PM

24

1370.50

CEUX

GENMAB A/S

26-Mar-25

1:29:19 PM

9

1370.00

AQEU

GENMAB A/S

26-Mar-25

1:29:27 PM

8

1369.50

XCSE

GENMAB A/S

26-Mar-25

1:29:31 PM

1

1369.50

XCSE

GENMAB A/S

26-Mar-25

1:30:02 PM

5

1369.50

XCSE

GENMAB A/S

26-Mar-25

1:30:02 PM

9

1369.50

XCSE

GENMAB A/S

26-Mar-25

1:30:25 PM

52

1369.00

CEUX

GENMAB A/S

26-Mar-25

1:30:27 PM

75

1368.50

XCSE

GENMAB A/S

26-Mar-25

1:30:30 PM

2

1367.50

CEUX

GENMAB A/S

26-Mar-25

1:30:31 PM

10

1367.50

CEUX

GENMAB A/S

26-Mar-25

1:30:59 PM

19

1367.50

CEUX

24


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

1:31:07 PM

27

1367.50

CEUX

GENMAB A/S

26-Mar-25

1:31:15 PM

44

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:31:15 PM

27

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:32:30 PM

70

1366.00

XCSE

GENMAB A/S

26-Mar-25

1:32:30 PM

71

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:32:30 PM

46

1366.00

CEUX

GENMAB A/S

26-Mar-25

1:32:30 PM

24

1367.00

AQEU

GENMAB A/S

26-Mar-25

1:33:04 PM

75

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:33:04 PM

57

1367.50

CEUX

GENMAB A/S

26-Mar-25

1:34:45 PM

75

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:34:45 PM

58

1366.50

CEUX

GENMAB A/S

26-Mar-25

1:35:38 PM

72

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:35:38 PM

23

1367.00

AQEU

GENMAB A/S

26-Mar-25

1:37:27 PM

23

1366.50

CEUX

GENMAB A/S

26-Mar-25

1:39:26 PM

12

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:39:26 PM

71

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:39:26 PM

59

1367.00

CEUX

GENMAB A/S

26-Mar-25

1:39:26 PM

24

1367.50

TQEX

GENMAB A/S

26-Mar-25

1:39:26 PM

24

1367.50

AQEU

GENMAB A/S

26-Mar-25

1:39:30 PM

70

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:40:21 PM

73

1365.50

XCSE

GENMAB A/S

26-Mar-25

1:40:21 PM

1

1365.50

CEUX

GENMAB A/S

26-Mar-25

1:40:21 PM

43

1365.50

CEUX

GENMAB A/S

26-Mar-25

1:40:31 PM

57

1365.50

CEUX

GENMAB A/S

26-Mar-25

1:41:00 PM

69

1365.00

XCSE

GENMAB A/S

26-Mar-25

1:41:00 PM

25

1365.00

TQEX

GENMAB A/S

26-Mar-25

1:41:08 PM

72

1364.00

XCSE

GENMAB A/S

26-Mar-25

1:41:08 PM

4

1364.00

CEUX

GENMAB A/S

26-Mar-25

1:41:08 PM

29

1364.00

CEUX

GENMAB A/S

26-Mar-25

1:41:40 PM

14

1363.00

XCSE

GENMAB A/S

26-Mar-25

1:42:28 PM

41

1363.50

AQEU

GENMAB A/S

26-Mar-25

1:43:08 PM

35

1363.50

CEUX

GENMAB A/S

26-Mar-25

1:44:48 PM

50

1367.00

CEUX

GENMAB A/S

26-Mar-25

1:44:48 PM

26

1367.50

TQEX

GENMAB A/S

26-Mar-25

1:44:49 PM

74

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:44:49 PM

35

1367.00

CEUX

GENMAB A/S

26-Mar-25

1:44:49 PM

56

1366.00

CEUX

GENMAB A/S

26-Mar-25

1:44:54 PM

75

1365.00

XCSE

GENMAB A/S

26-Mar-25

1:46:26 PM

26

1365.00

CEUX

GENMAB A/S

26-Mar-25

1:46:41 PM

74

1365.00

XCSE

GENMAB A/S

26-Mar-25

1:48:35 PM

34

1366.00

CEUX

GENMAB A/S

26-Mar-25

1:48:41 PM

2

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:48:41 PM

8

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:49:03 PM

30

1367.50

CEUX

GENMAB A/S

26-Mar-25

1:50:23 PM

75

1368.00

XCSE

25


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

1:50:23 PM

28

1368.00

CEUX

GENMAB A/S

26-Mar-25

1:50:23 PM

42

1368.00

TQEX

GENMAB A/S

26-Mar-25

1:50:23 PM

41

1368.00

AQEU

GENMAB A/S

26-Mar-25

1:50:25 PM

19

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:50:25 PM

25

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:50:25 PM

2

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:50:25 PM

1

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:50:25 PM

74

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:50:25 PM

23

1368.00

CEUX

GENMAB A/S

26-Mar-25

1:51:25 PM

11

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:51:25 PM

2

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:51:25 PM

12

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:51:25 PM

2

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:51:25 PM

2

1367.50

CEUX

GENMAB A/S

26-Mar-25

1:51:34 PM

29

1367.50

CEUX

GENMAB A/S

26-Mar-25

1:52:05 PM

17

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:52:05 PM

12

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:52:05 PM

30

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:52:05 PM

8

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:52:05 PM

4

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:52:55 PM

2

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:52:57 PM

18

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:53:11 PM

6

1366.50

CEUX

GENMAB A/S

26-Mar-25

1:53:15 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:53:15 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:53:15 PM

2

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:53:37 PM

18

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:54:03 PM

1

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:54:15 PM

1

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:54:15 PM

12

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:54:15 PM

12

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:54:15 PM

18

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:54:15 PM

12

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:54:15 PM

18

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:54:55 PM

14

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:54:55 PM

18

1367.00

XCSE

GENMAB A/S

26-Mar-25

1:55:28 PM

5

1369.00

XCSE

GENMAB A/S

26-Mar-25

1:55:28 PM

72

1369.00

XCSE

GENMAB A/S

26-Mar-25

1:55:28 PM

18

1369.00

XCSE

GENMAB A/S

26-Mar-25

1:55:28 PM

40

1369.50

CEUX

GENMAB A/S

26-Mar-25

1:55:28 PM

12

1369.50

CEUX

GENMAB A/S

26-Mar-25

1:55:28 PM

22

1369.00

TQEX

GENMAB A/S

26-Mar-25

1:55:42 PM

48

1368.50

CEUX

GENMAB A/S

26-Mar-25

1:56:55 PM

73

1368.50

XCSE

GENMAB A/S

26-Mar-25

1:56:55 PM

18

1368.50

XCSE

26


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

1:56:55 PM

1

1368.50

XCSE

GENMAB A/S

26-Mar-25

1:56:55 PM

4

1368.50

XCSE

GENMAB A/S

26-Mar-25

1:56:55 PM

40

1368.00

AQEU

GENMAB A/S

26-Mar-25

1:57:31 PM

55

1367.50

CEUX

GENMAB A/S

26-Mar-25

1:58:25 PM

8

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:58:25 PM

3

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:58:25 PM

3

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:59:25 PM

15

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:59:25 PM

2

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:59:25 PM

39

1368.00

CEUX

GENMAB A/S

26-Mar-25

1:59:26 PM

12

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:59:26 PM

11

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:59:26 PM

17

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:59:26 PM

18

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:59:26 PM

3

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:59:26 PM

4

1368.00

XCSE

GENMAB A/S

26-Mar-25

1:59:47 PM

70

1367.50

XCSE

GENMAB A/S

26-Mar-25

1:59:47 PM

44

1367.00

CEUX

GENMAB A/S

26-Mar-25

1:59:47 PM

39

1367.50

TQEX

GENMAB A/S

26-Mar-25

1:59:49 PM

49

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:59:49 PM

23

1366.50

XCSE

GENMAB A/S

26-Mar-25

1:59:49 PM

25

1366.00

CEUX

GENMAB A/S

26-Mar-25

2:00:32 PM

75

1366.00

XCSE

GENMAB A/S

26-Mar-25

2:00:32 PM

30

1366.00

CEUX

GENMAB A/S

26-Mar-25

2:01:36 PM

71

1366.00

XCSE

GENMAB A/S

26-Mar-25

2:03:52 PM

30

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:03:52 PM

40

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:04:34 PM

23

1365.00

CEUX

GENMAB A/S

26-Mar-25

2:06:32 PM

10

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:06:32 PM

12

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:06:32 PM

8

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:06:32 PM

13

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:06:32 PM

16

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:06:32 PM

10

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:06:33 PM

23

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:06:44 PM

48

1364.00

XCSE

GENMAB A/S

26-Mar-25

2:06:44 PM

6

1364.00

XCSE

GENMAB A/S

26-Mar-25

2:06:44 PM

37

1364.50

XCSE

GENMAB A/S

26-Mar-25

2:06:44 PM

8

1364.00

XCSE

GENMAB A/S

26-Mar-25

2:06:44 PM

7

1364.00

XCSE

GENMAB A/S

26-Mar-25

2:06:44 PM

15

1364.00

CEUX

GENMAB A/S

26-Mar-25

2:06:44 PM

10

1364.00

CEUX

GENMAB A/S

26-Mar-25

2:06:49 PM

36

1363.50

TQEX

GENMAB A/S

26-Mar-25

2:06:49 PM

5

1363.50

TQEX

GENMAB A/S

26-Mar-25

2:06:49 PM

39

1363.50

AQEU

27


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:07:26 PM

74

1363.00

XCSE

GENMAB A/S

26-Mar-25

2:08:34 PM

71

1363.00

XCSE

GENMAB A/S

26-Mar-25

2:08:34 PM

23

1363.00

CEUX

GENMAB A/S

26-Mar-25

2:09:50 PM

72

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:10:25 PM

75

1364.50

CEUX

GENMAB A/S

26-Mar-25

2:11:09 PM

75

1364.00

XCSE

GENMAB A/S

26-Mar-25

2:11:17 PM

41

1363.50

AQEU

GENMAB A/S

26-Mar-25

2:11:18 PM

72

1362.50

XCSE

GENMAB A/S

26-Mar-25

2:11:18 PM

72

1363.00

CEUX

GENMAB A/S

26-Mar-25

2:11:18 PM

20

1363.00

TQEX

GENMAB A/S

26-Mar-25

2:11:18 PM

19

1363.00

TQEX

GENMAB A/S

26-Mar-25

2:12:34 PM

39

1361.50

CEUX

GENMAB A/S

26-Mar-25

2:13:25 PM

42

1362.00

XCSE

GENMAB A/S

26-Mar-25

2:13:25 PM

4

1362.00

XCSE

GENMAB A/S

26-Mar-25

2:13:25 PM

10

1362.00

XCSE

GENMAB A/S

26-Mar-25

2:13:25 PM

12

1362.00

XCSE

GENMAB A/S

26-Mar-25

2:13:25 PM

71

1361.00

XCSE

GENMAB A/S

26-Mar-25

2:13:25 PM

26

1362.00

XCSE

GENMAB A/S

26-Mar-25

2:13:33 PM

69

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:13:33 PM

62

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:15:12 PM

69

1362.50

XCSE

GENMAB A/S

26-Mar-25

2:15:12 PM

40

1362.50

CEUX

GENMAB A/S

26-Mar-25

2:15:16 PM

2

1362.50

CEUX

GENMAB A/S

26-Mar-25

2:15:16 PM

13

1362.50

CEUX

GENMAB A/S

26-Mar-25

2:16:57 PM

69

1362.50

XCSE

GENMAB A/S

26-Mar-25

2:16:57 PM

40

1363.00

AQEU

GENMAB A/S

26-Mar-25

2:17:27 PM

72

1366.00

XCSE

GENMAB A/S

26-Mar-25

2:17:27 PM

6

1366.00

CEUX

GENMAB A/S

26-Mar-25

2:17:27 PM

75

1366.00

CEUX

GENMAB A/S

26-Mar-25

2:17:27 PM

47

1366.00

CEUX

GENMAB A/S

26-Mar-25

2:17:27 PM

41

1366.00

TQEX

GENMAB A/S

26-Mar-25

2:17:41 PM

6

1365.50

CEUX

GENMAB A/S

26-Mar-25

2:17:41 PM

21

1365.50

CEUX

GENMAB A/S

26-Mar-25

2:17:44 PM

74

1365.00

XCSE

GENMAB A/S

26-Mar-25

2:17:54 PM

71

1364.50

CEUX

GENMAB A/S

26-Mar-25

2:18:25 PM

72

1364.00

XCSE

GENMAB A/S

26-Mar-25

2:19:09 PM

73

1363.50

XCSE

GENMAB A/S

26-Mar-25

2:19:09 PM

38

1363.50

CEUX

GENMAB A/S

26-Mar-25

2:19:09 PM

2

1363.50

CEUX

GENMAB A/S

26-Mar-25

2:19:49 PM

23

1363.00

CEUX

GENMAB A/S

26-Mar-25

2:19:59 PM

74

1364.50

XCSE

GENMAB A/S

26-Mar-25

2:20:00 PM

16

1363.50

XCSE

GENMAB A/S

26-Mar-25

2:20:14 PM

59

1363.50

XCSE

GENMAB A/S

26-Mar-25

2:21:29 PM

73

1362.50

XCSE

GENMAB A/S

26-Mar-25

2:21:29 PM

23

1362.50

CEUX

28


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:21:53 PM

75

1363.50

XCSE

GENMAB A/S

26-Mar-25

2:21:53 PM

30

1363.50

CEUX

GENMAB A/S

26-Mar-25

2:22:19 PM

10

1364.00

CEUX

GENMAB A/S

26-Mar-25

2:22:19 PM

18

1364.00

CEUX

GENMAB A/S

26-Mar-25

2:22:19 PM

30

1364.00

TQEX

GENMAB A/S

26-Mar-25

2:22:54 PM

68

1363.50

XCSE

GENMAB A/S

26-Mar-25

2:23:25 PM

42

1363.50

AQEU

GENMAB A/S

26-Mar-25

2:23:52 PM

72

1362.50

XCSE

GENMAB A/S

26-Mar-25

2:23:52 PM

32

1362.50

CEUX

GENMAB A/S

26-Mar-25

2:24:40 PM

70

1362.00

XCSE

GENMAB A/S

26-Mar-25

2:25:12 PM

1

1362.00

CEUX

GENMAB A/S

26-Mar-25

2:25:12 PM

27

1362.00

CEUX

GENMAB A/S

26-Mar-25

2:25:15 PM

8

1362.00

CEUX

GENMAB A/S

26-Mar-25

2:25:41 PM

65

1362.00

XCSE

GENMAB A/S

26-Mar-25

2:25:41 PM

9

1362.00

XCSE

GENMAB A/S

26-Mar-25

2:25:41 PM

43

1362.00

CEUX

GENMAB A/S

26-Mar-25

2:26:18 PM

75

1361.00

XCSE

GENMAB A/S

26-Mar-25

2:26:18 PM

71

1362.00

XCSE

GENMAB A/S

26-Mar-25

2:26:18 PM

23

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:26:18 PM

36

1362.00

CEUX

GENMAB A/S

26-Mar-25

2:26:18 PM

9

1360.50

TQEX

GENMAB A/S

26-Mar-25

2:26:18 PM

29

1361.50

TQEX

GENMAB A/S

26-Mar-25

2:26:19 PM

60

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:26:30 PM

25

1360.50

XCSE

GENMAB A/S

26-Mar-25

2:26:30 PM

30

1360.50

CEUX

GENMAB A/S

26-Mar-25

2:27:30 PM

70

1363.50

XCSE

GENMAB A/S

26-Mar-25

2:27:30 PM

31

1363.50

CEUX

GENMAB A/S

26-Mar-25

2:27:55 PM

5

1364.50

XCSE

GENMAB A/S

26-Mar-25

2:27:55 PM

66

1364.50

XCSE

GENMAB A/S

26-Mar-25

2:27:55 PM

21

1364.50

CEUX

GENMAB A/S

26-Mar-25

2:27:55 PM

10

1364.50

CEUX

GENMAB A/S

26-Mar-25

2:27:55 PM

31

1364.50

AQEU

GENMAB A/S

26-Mar-25

2:29:33 PM

71

1364.50

XCSE

GENMAB A/S

26-Mar-25

2:29:33 PM

5

1364.50

CEUX

GENMAB A/S

26-Mar-25

2:29:33 PM

2

1364.50

CEUX

GENMAB A/S

26-Mar-25

2:29:33 PM

34

1364.50

CEUX

GENMAB A/S

26-Mar-25

2:29:52 PM

15

1364.00

AQEU

GENMAB A/S

26-Mar-25

2:29:52 PM

9

1364.00

AQEU

GENMAB A/S

26-Mar-25

2:30:00 PM

1

1363.50

XCSE

GENMAB A/S

26-Mar-25

2:30:00 PM

15

1363.50

XCSE

GENMAB A/S

26-Mar-25

2:30:00 PM

55

1363.50

XCSE

GENMAB A/S

26-Mar-25

2:30:00 PM

25

1363.50

CEUX

GENMAB A/S

26-Mar-25

2:30:02 PM

23

1363.00

TQEX

GENMAB A/S

26-Mar-25

2:30:10 PM

19

1362.50

XCSE

GENMAB A/S

26-Mar-25

2:30:10 PM

53

1362.50

XCSE

29


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:30:10 PM

14

1362.50

CEUX

GENMAB A/S

26-Mar-25

2:30:10 PM

9

1362.50

CEUX

GENMAB A/S

26-Mar-25

2:30:11 PM

72

1361.00

XCSE

GENMAB A/S

26-Mar-25

2:30:11 PM

44

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:30:11 PM

6

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:30:12 PM

23

1359.50

XCSE

GENMAB A/S

26-Mar-25

2:30:12 PM

50

1359.50

XCSE

GENMAB A/S

26-Mar-25

2:30:12 PM

43

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:30:13 PM

52

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:30:41 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:30:41 PM

22

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:30:41 PM

34

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:30:41 PM

3

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:30:42 PM

10

1360.50

XCSE

GENMAB A/S

26-Mar-25

2:30:42 PM

3

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:30:42 PM

8

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:30:42 PM

12

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:30:47 PM

10

1362.00

TQEX

GENMAB A/S

26-Mar-25

2:30:48 PM

15

1362.00

TQEX

GENMAB A/S

26-Mar-25

2:30:48 PM

3

1362.00

AQEU

GENMAB A/S

26-Mar-25

2:30:48 PM

21

1362.00

AQEU

GENMAB A/S

26-Mar-25

2:31:10 PM

57

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:31:10 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:31:10 PM

35

1361.50

CEUX

GENMAB A/S

26-Mar-25

2:31:13 PM

18

1360.50

XCSE

GENMAB A/S

26-Mar-25

2:31:13 PM

33

1360.50

CEUX

GENMAB A/S

26-Mar-25

2:31:18 PM

48

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:31:18 PM

25

1359.50

CEUX

GENMAB A/S

26-Mar-25

2:31:18 PM

34

1358.50

CEUX

GENMAB A/S

26-Mar-25

2:31:19 PM

42

1358.00

XCSE

GENMAB A/S

26-Mar-25

2:31:31 PM

31

1358.00

XCSE

GENMAB A/S

26-Mar-25

2:31:31 PM

3

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:31:31 PM

7

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:31:31 PM

60

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:31:31 PM

1

1356.00

XCSE

GENMAB A/S

26-Mar-25

2:31:31 PM

33

1357.00

CEUX

GENMAB A/S

26-Mar-25

2:31:31 PM

12

1357.00

AQEU

GENMAB A/S

26-Mar-25

2:31:35 PM

26

1358.50

TQEX

GENMAB A/S

26-Mar-25

2:32:10 PM

22

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:32:10 PM

17

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:32:10 PM

68

1356.00

XCSE

GENMAB A/S

26-Mar-25

2:32:10 PM

62

1358.00

XCSE

GENMAB A/S

26-Mar-25

2:32:10 PM

24

1356.50

CEUX

GENMAB A/S

26-Mar-25

2:32:10 PM

30

1357.50

CEUX

GENMAB A/S

26-Mar-25

2:32:10 PM

29

1357.00

AQEU

30


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:33:01 PM

23

1358.00

TQEX

GENMAB A/S

26-Mar-25

2:33:14 PM

74

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:33:27 PM

17

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:33:27 PM

10

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:33:27 PM

72

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:33:27 PM

21

1357.50

CEUX

GENMAB A/S

26-Mar-25

2:33:27 PM

25

1357.50

CEUX

GENMAB A/S

26-Mar-25

2:33:27 PM

23

1357.50

TQEX

GENMAB A/S

26-Mar-25

2:33:27 PM

23

1358.00

AQEU

GENMAB A/S

26-Mar-25

2:34:25 PM

74

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:34:25 PM

22

1355.00

XCSE

GENMAB A/S

26-Mar-25

2:34:25 PM

10

1356.00

XCSE

GENMAB A/S

26-Mar-25

2:34:25 PM

20

1356.00

XCSE

GENMAB A/S

26-Mar-25

2:34:25 PM

50

1355.00

XCSE

GENMAB A/S

26-Mar-25

2:34:25 PM

11

1355.50

XCSE

GENMAB A/S

26-Mar-25

2:34:25 PM

33

1356.50

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

1

1355.50

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

4

1355.50

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

2

1355.50

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

2

1355.50

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

1

1355.50

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

1

1355.50

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

16

1355.00

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

20

1355.00

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

2

1355.50

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

1

1355.50

CEUX

GENMAB A/S

26-Mar-25

2:34:25 PM

11

1355.50

TQEX

GENMAB A/S

26-Mar-25

2:34:25 PM

24

1355.50

AQEU

GENMAB A/S

26-Mar-25

2:34:25 PM

14

1355.50

AQEU

GENMAB A/S

26-Mar-25

2:34:26 PM

39

1355.50

XCSE

GENMAB A/S

26-Mar-25

2:34:27 PM

23

1355.50

XCSE

GENMAB A/S

26-Mar-25

2:34:27 PM

59

1355.50

CEUX

GENMAB A/S

26-Mar-25

2:34:57 PM

20

1355.00

XCSE

GENMAB A/S

26-Mar-25

2:34:57 PM

30

1355.00

XCSE

GENMAB A/S

26-Mar-25

2:34:57 PM

10

1355.00

XCSE

GENMAB A/S

26-Mar-25

2:34:57 PM

12

1355.00

XCSE

GENMAB A/S

26-Mar-25

2:34:59 PM

12

1354.00

XCSE

GENMAB A/S

26-Mar-25

2:34:59 PM

10

1354.00

XCSE

GENMAB A/S

26-Mar-25

2:34:59 PM

20

1354.00

CEUX

GENMAB A/S

26-Mar-25

2:34:59 PM

6

1354.00

CEUX

GENMAB A/S

26-Mar-25

2:35:00 PM

20

1354.00

XCSE

GENMAB A/S

26-Mar-25

2:35:30 PM

32

1354.00

XCSE

GENMAB A/S

26-Mar-25

2:35:31 PM

42

1354.00

XCSE

GENMAB A/S

26-Mar-25

2:35:31 PM

20

1353.50

XCSE

GENMAB A/S

26-Mar-25

2:35:31 PM

20

1354.00

XCSE

31


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:35:31 PM

45

1354.00

XCSE

GENMAB A/S

26-Mar-25

2:35:31 PM

30

1354.00

XCSE

GENMAB A/S

26-Mar-25

2:35:31 PM

49

1354.00

CEUX

GENMAB A/S

26-Mar-25

2:35:31 PM

29

1354.00

TQEX

GENMAB A/S

26-Mar-25

2:35:31 PM

23

1354.00

AQEU

GENMAB A/S

26-Mar-25

2:35:41 PM

11

1354.50

XCSE

GENMAB A/S

26-Mar-25

2:35:41 PM

3

1354.50

XCSE

GENMAB A/S

26-Mar-25

2:35:41 PM

42

1354.50

XCSE

GENMAB A/S

26-Mar-25

2:35:41 PM

12

1354.50

XCSE

GENMAB A/S

26-Mar-25

2:35:41 PM

21

1354.50

XCSE

GENMAB A/S

26-Mar-25

2:35:41 PM

2

1354.50

XCSE

GENMAB A/S

26-Mar-25

2:36:21 PM

30

1353.00

XCSE

GENMAB A/S

26-Mar-25

2:36:21 PM

75

1354.00

XCSE

GENMAB A/S

26-Mar-25

2:36:21 PM

45

1353.00

XCSE

GENMAB A/S

26-Mar-25

2:36:21 PM

71

1352.50

CEUX

GENMAB A/S

26-Mar-25

2:36:21 PM

69

1353.50

CEUX

GENMAB A/S

26-Mar-25

2:36:21 PM

24

1352.50

TQEX

GENMAB A/S

26-Mar-25

2:36:27 PM

57

1353.00

CEUX

GENMAB A/S

26-Mar-25

2:36:30 PM

71

1352.50

XCSE

GENMAB A/S

26-Mar-25

2:36:31 PM

73

1352.00

CEUX

GENMAB A/S

26-Mar-25

2:36:43 PM

71

1351.50

XCSE

GENMAB A/S

26-Mar-25

2:37:04 PM

69

1353.50

XCSE

GENMAB A/S

26-Mar-25

2:37:13 PM

23

1353.50

AQEU

GENMAB A/S

26-Mar-25

2:37:44 PM

1

1353.00

CEUX

GENMAB A/S

26-Mar-25

2:37:44 PM

23

1353.00

CEUX

GENMAB A/S

26-Mar-25

2:37:48 PM

72

1352.50

XCSE

GENMAB A/S

26-Mar-25

2:37:48 PM

8

1352.00

CEUX

GENMAB A/S

26-Mar-25

2:37:48 PM

15

1352.00

CEUX

GENMAB A/S

26-Mar-25

2:37:48 PM

25

1352.00

TQEX

GENMAB A/S

26-Mar-25

2:38:53 PM

16

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:38:53 PM

2

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:39:01 PM

42

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:39:01 PM

10

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:39:01 PM

30

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:39:01 PM

23

1357.50

AQEU

GENMAB A/S

26-Mar-25

2:39:02 PM

17

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:39:02 PM

10

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:39:02 PM

9

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:39:02 PM

11

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:39:02 PM

69

1357.00

CEUX

GENMAB A/S

26-Mar-25

2:39:14 PM

69

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:39:15 PM

10

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:39:15 PM

14

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:39:15 PM

48

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:39:15 PM

43

1357.00

TQEX

32


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:39:21 PM

2

1356.00

CEUX

GENMAB A/S

26-Mar-25

2:39:22 PM

71

1356.00

CEUX

GENMAB A/S

26-Mar-25

2:39:32 PM

11

1355.50

XCSE

GENMAB A/S

26-Mar-25

2:39:59 PM

9

1357.00

AQEU

GENMAB A/S

26-Mar-25

2:40:03 PM

10

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:40:15 PM

10

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:40:31 PM

9

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:40:35 PM

11

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:40:44 PM

72

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:40:44 PM

75

1358.00

CEUX

GENMAB A/S

26-Mar-25

2:41:05 PM

38

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:41:05 PM

4

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:41:05 PM

11

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:41:05 PM

19

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:41:05 PM

22

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:41:33 PM

42

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:41:33 PM

2

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:41:51 PM

72

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:41:51 PM

9

1359.50

CEUX

GENMAB A/S

26-Mar-25

2:41:51 PM

54

1359.50

CEUX

GENMAB A/S

26-Mar-25

2:41:51 PM

30

1359.50

AQEU

GENMAB A/S

26-Mar-25

2:41:52 PM

7

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:41:54 PM

9

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:41:54 PM

16

1358.50

TQEX

GENMAB A/S

26-Mar-25

2:42:23 PM

4

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:42:23 PM

2

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:42:23 PM

63

1359.00

CEUX

GENMAB A/S

26-Mar-25

2:42:23 PM

15

1359.00

AQEU

GENMAB A/S

26-Mar-25

2:42:27 PM

15

1359.00

CEUX

GENMAB A/S

26-Mar-25

2:42:27 PM

24

1359.00

CEUX

GENMAB A/S

26-Mar-25

2:43:11 PM

3

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:43:11 PM

11

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:43:25 PM

44

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:43:25 PM

50

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:43:25 PM

57

1359.00

CEUX

GENMAB A/S

26-Mar-25

2:43:26 PM

19

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:43:26 PM

75

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:43:56 PM

10

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:44:04 PM

10

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:44:04 PM

10

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:44:04 PM

37

1359.00

CEUX

GENMAB A/S

26-Mar-25

2:44:27 PM

23

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:44:27 PM

31

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:44:27 PM

10

1358.00

XCSE

GENMAB A/S

26-Mar-25

2:44:27 PM

42

1358.00

XCSE

33


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:44:27 PM

11

1358.00

XCSE

GENMAB A/S

26-Mar-25

2:44:27 PM

44

1359.00

CEUX

GENMAB A/S

26-Mar-25

2:44:27 PM

10

1358.00

CEUX

GENMAB A/S

26-Mar-25

2:44:27 PM

17

1358.00

CEUX

GENMAB A/S

26-Mar-25

2:44:27 PM

23

1358.50

TQEX

GENMAB A/S

26-Mar-25

2:44:27 PM

26

1359.00

AQEU

GENMAB A/S

26-Mar-25

2:45:13 PM

12

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:13 PM

3

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:45:13 PM

4

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:45:13 PM

56

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:45:13 PM

11

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:13 PM

16

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:13 PM

10

1358.50

XCSE

GENMAB A/S

26-Mar-25

2:45:26 PM

3

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:26 PM

10

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:26 PM

10

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:45 PM

42

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:45 PM

10

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:45 PM

3

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:45 PM

23

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:45 PM

16

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:45:49 PM

5

1358.50

TQEX

GENMAB A/S

26-Mar-25

2:47:06 PM

10

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:47:06 PM

42

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:47:06 PM

11

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:47:06 PM

68

1359.00

CEUX

GENMAB A/S

26-Mar-25

2:48:12 PM

74

1359.50

XCSE

GENMAB A/S

26-Mar-25

2:48:12 PM

24

1359.50

TQEX

GENMAB A/S

26-Mar-25

2:48:12 PM

35

1359.50

AQEU

GENMAB A/S

26-Mar-25

2:48:24 PM

2

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:48:24 PM

9

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:48:24 PM

5

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:48:24 PM

2

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:48:24 PM

4

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:49:27 PM

69

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:49:51 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:49:51 PM

19

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:49:51 PM

42

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:50:04 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:50:41 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:50:41 PM

42

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:50:45 PM

8

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:52:26 PM

1

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:53:28 PM

65

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:53:28 PM

7

1361.50

XCSE

34


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:53:28 PM

36

1361.50

CEUX

GENMAB A/S

26-Mar-25

2:53:46 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:53:46 PM

9

1361.50

CEUX

GENMAB A/S

26-Mar-25

2:53:51 PM

69

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:53:52 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:53:52 PM

42

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:07 PM

14

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:07 PM

28

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

71

1360.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

24

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

1

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

72

1359.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

28

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

2:54:26 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:54:26 PM

5

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:54:26 PM

75

1359.00

CEUX

GENMAB A/S

26-Mar-25

2:54:26 PM

14

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:54:26 PM

58

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:54:26 PM

5

1361.00

CEUX

GENMAB A/S

26-Mar-25

2:54:26 PM

10

1360.00

TQEX

GENMAB A/S

26-Mar-25

2:54:26 PM

16

1360.00

TQEX

GENMAB A/S

26-Mar-25

2:54:26 PM

24

1361.00

TQEX

GENMAB A/S

26-Mar-25

2:54:26 PM

28

1360.50

AQEU

GENMAB A/S

26-Mar-25

2:55:21 PM

1

1359.50

CEUX

GENMAB A/S

26-Mar-25

2:55:40 PM

24

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:55:40 PM

7

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:55:40 PM

3

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:55:40 PM

2

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:55:40 PM

10

1360.00

CEUX

GENMAB A/S

26-Mar-25

2:55:48 PM

17

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:55:59 PM

42

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:55:59 PM

11

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:55:59 PM

11

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:56:00 PM

1

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:56:00 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:56:00 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:56:13 PM

72

1361.00

XCSE

GENMAB A/S

26-Mar-25

2:56:13 PM

9

1361.00

AQEU

GENMAB A/S

26-Mar-25

2:56:13 PM

26

1361.00

AQEU

GENMAB A/S

26-Mar-25

2:56:16 PM

74

1360.00

XCSE

GENMAB A/S

26-Mar-25

2:56:16 PM

10

1359.00

XCSE

35


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:56:16 PM

32

1360.50

CEUX

GENMAB A/S

26-Mar-25

2:56:16 PM

11

1360.50

CEUX

GENMAB A/S

26-Mar-25

2:56:16 PM

30

1360.50

CEUX

GENMAB A/S

26-Mar-25

2:56:16 PM

70

1359.50

CEUX

GENMAB A/S

26-Mar-25

2:56:16 PM

34

1360.50

CEUX

GENMAB A/S

26-Mar-25

2:56:16 PM

36

1361.00

TQEX

GENMAB A/S

26-Mar-25

2:56:16 PM

4

1359.50

TQEX

GENMAB A/S

26-Mar-25

2:56:16 PM

8

1358.50

TQEX

GENMAB A/S

26-Mar-25

2:56:16 PM

10

1359.50

TQEX

GENMAB A/S

26-Mar-25

2:56:16 PM

10

1359.50

TQEX

GENMAB A/S

26-Mar-25

2:56:16 PM

7

1359.50

TQEX

GENMAB A/S

26-Mar-25

2:56:16 PM

35

1360.00

AQEU

GENMAB A/S

26-Mar-25

2:56:21 PM

63

1359.00

XCSE

GENMAB A/S

26-Mar-25

2:56:25 PM

20

1358.50

CEUX

GENMAB A/S

26-Mar-25

2:56:25 PM

8

1358.50

CEUX

GENMAB A/S

26-Mar-25

2:56:25 PM

20

1358.50

CEUX

GENMAB A/S

26-Mar-25

2:56:25 PM

10

1358.50

CEUX

GENMAB A/S

26-Mar-25

2:56:25 PM

2

1358.50

CEUX

GENMAB A/S

26-Mar-25

2:56:25 PM

15

1358.50

CEUX

GENMAB A/S

26-Mar-25

2:56:37 PM

47

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:56:37 PM

22

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:56:37 PM

6

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:56:37 PM

14

1357.50

CEUX

GENMAB A/S

26-Mar-25

2:56:37 PM

40

1357.50

CEUX

GENMAB A/S

26-Mar-25

2:56:37 PM

11

1357.50

CEUX

GENMAB A/S

26-Mar-25

2:56:37 PM

7

1357.50

CEUX

GENMAB A/S

26-Mar-25

2:56:37 PM

3

1357.50

CEUX

GENMAB A/S

26-Mar-25

2:56:45 PM

6

1356.00

CEUX

GENMAB A/S

26-Mar-25

2:56:50 PM

7

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:56:50 PM

20

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:56:50 PM

32

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:56:50 PM

10

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:56:50 PM

30

1356.00

CEUX

GENMAB A/S

26-Mar-25

2:57:10 PM

23

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:57:10 PM

17

1357.00

CEUX

GENMAB A/S

26-Mar-25

2:57:10 PM

18

1357.00

CEUX

GENMAB A/S

26-Mar-25

2:57:10 PM

25

1357.00

AQEU

GENMAB A/S

26-Mar-25

2:57:13 PM

19

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:57:13 PM

42

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:57:13 PM

49

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:57:13 PM

14

1356.00

CEUX

GENMAB A/S

26-Mar-25

2:57:18 PM

42

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:57:18 PM

6

1356.00

XCSE

GENMAB A/S

26-Mar-25

2:57:18 PM

19

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:57:18 PM

19

1356.00

CEUX

36


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

2:57:56 PM

67

1356.00

XCSE

GENMAB A/S

26-Mar-25

2:58:20 PM

4

1356.50

CEUX

GENMAB A/S

26-Mar-25

2:58:20 PM

1

1356.50

CEUX

GENMAB A/S

26-Mar-25

2:58:28 PM

20

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:58:28 PM

27

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:58:28 PM

10

1356.50

CEUX

GENMAB A/S

26-Mar-25

2:58:30 PM

10

1356.50

CEUX

GENMAB A/S

26-Mar-25

2:58:31 PM

12

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:58:31 PM

42

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:58:31 PM

33

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:58:31 PM

29

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:58:31 PM

8

1356.50

XCSE

GENMAB A/S

26-Mar-25

2:58:31 PM

11

1357.00

XCSE

GENMAB A/S

26-Mar-25

2:58:31 PM

8

1356.50

CEUX

GENMAB A/S

26-Mar-25

2:58:31 PM

23

1356.50

TQEX

GENMAB A/S

26-Mar-25

2:58:58 PM

31

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:58:58 PM

11

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:58:58 PM

42

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:58:58 PM

10

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:58:59 PM

10

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:58:59 PM

12

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:59:00 PM

42

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:59:00 PM

11

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:59:00 PM

42

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:59:00 PM

11

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:59:00 PM

12

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:59:00 PM

12

1357.50

XCSE

GENMAB A/S

26-Mar-25

2:59:01 PM

8

1356.50

XCSE

GENMAB A/S

26-Mar-25

3:00:00 PM

75

1357.50

XCSE

GENMAB A/S

26-Mar-25

3:00:00 PM

10

1357.00

CEUX

GENMAB A/S

26-Mar-25

3:01:16 PM

25

1358.50

XCSE

GENMAB A/S

26-Mar-25

3:01:16 PM

10

1358.00

CEUX

GENMAB A/S

26-Mar-25

3:01:16 PM

10

1358.00

CEUX

GENMAB A/S

26-Mar-25

3:01:16 PM

20

1358.00

CEUX

GENMAB A/S

26-Mar-25

3:02:31 PM

74

1360.00

CEUX

GENMAB A/S

26-Mar-25

3:02:31 PM

23

1360.00

TQEX

GENMAB A/S

26-Mar-25

3:02:31 PM

34

1360.00

AQEU

GENMAB A/S

26-Mar-25

3:03:00 PM

4

1360.50

XCSE

GENMAB A/S

26-Mar-25

3:03:00 PM

70

1360.50

XCSE

GENMAB A/S

26-Mar-25

3:03:35 PM

74

1361.00

CEUX

GENMAB A/S

26-Mar-25

3:04:12 PM

9

1361.00

TQEX

GENMAB A/S

26-Mar-25

3:04:12 PM

8

1361.00

AQEU

GENMAB A/S

26-Mar-25

3:05:30 PM

3

1361.00

AQEU

GENMAB A/S

26-Mar-25

3:06:03 PM

2

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:06:34 PM

4

1361.50

CEUX

37


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:07:41 PM

1

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:07:41 PM

10

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:07:54 PM

39

1362.00

TQEX

GENMAB A/S

26-Mar-25

3:07:54 PM

41

1362.00

AQEU

GENMAB A/S

26-Mar-25

3:07:55 PM

2

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:08:23 PM

7

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:08:23 PM

3

1362.00

TQEX

GENMAB A/S

26-Mar-25

3:08:23 PM

20

1362.00

TQEX

GENMAB A/S

26-Mar-25

3:08:58 PM

10

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:08:59 PM

10

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:09:01 PM

38

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:09:01 PM

1

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:09:01 PM

7

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:09:15 PM

6

1362.00

CEUX

GENMAB A/S

26-Mar-25

3:09:49 PM

35

1363.00

CEUX

GENMAB A/S

26-Mar-25

3:10:05 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:10:05 PM

66

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:10:05 PM

15

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:10:05 PM

27

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:10:05 PM

71

1360.50

XCSE

GENMAB A/S

26-Mar-25

3:10:05 PM

71

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:10:05 PM

42

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:10:05 PM

36

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:10:05 PM

69

1362.50

CEUX

GENMAB A/S

26-Mar-25

3:10:05 PM

1

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:10:05 PM

7

1360.00

TQEX

GENMAB A/S

26-Mar-25

3:10:05 PM

26

1361.00

TQEX

GENMAB A/S

26-Mar-25

3:10:05 PM

15

1362.00

TQEX

GENMAB A/S

26-Mar-25

3:10:05 PM

12

1362.00

TQEX

GENMAB A/S

26-Mar-25

3:10:05 PM

31

1362.00

AQEU

GENMAB A/S

26-Mar-25

3:10:05 PM

19

1361.00

AQEU

GENMAB A/S

26-Mar-25

3:10:08 PM

28

1360.50

CEUX

GENMAB A/S

26-Mar-25

3:10:28 PM

7

1360.00

CEUX

GENMAB A/S

26-Mar-25

3:10:31 PM

20

1360.00

CEUX

GENMAB A/S

26-Mar-25

3:10:53 PM

2

1360.50

XCSE

GENMAB A/S

26-Mar-25

3:11:23 PM

70

1362.00

CEUX

GENMAB A/S

26-Mar-25

3:11:37 PM

10

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:11:37 PM

18

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:11:37 PM

11

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:11:37 PM

72

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:11:37 PM

42

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:11:44 PM

42

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:11:44 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:11:44 PM

12

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:11:45 PM

11

1362.50

XCSE

38


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:11:45 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:11:45 PM

12

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:11:45 PM

12

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:11:45 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:12:12 PM

20

1362.00

AQEU

GENMAB A/S

26-Mar-25

3:12:17 PM

24

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:12:17 PM

24

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:12:17 PM

6

1362.00

AQEU

GENMAB A/S

26-Mar-25

3:12:30 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:12:30 PM

42

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:12:30 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:12:30 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:12:31 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:12:31 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:13:15 PM

2

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:50 PM

21

1363.00

CEUX

GENMAB A/S

26-Mar-25

3:13:50 PM

1

1363.00

CEUX

GENMAB A/S

26-Mar-25

3:13:50 PM

20

1363.00

CEUX

GENMAB A/S

26-Mar-25

3:13:50 PM

32

1363.00

CEUX

GENMAB A/S

26-Mar-25

3:13:58 PM

11

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

30

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

11

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

11

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

42

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

12

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

11

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

12

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

11

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

70

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:13:58 PM

28

1362.50

TQEX

GENMAB A/S

26-Mar-25

3:13:59 PM

11

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:59 PM

10

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:59 PM

10

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:13:59 PM

10

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:14:01 PM

12

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:15:10 PM

73

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:15:26 PM

4

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:15:26 PM

3

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:15:26 PM

74

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:15:26 PM

24

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:15:26 PM

27

1364.00

AQEU

GENMAB A/S

26-Mar-25

3:17:03 PM

71

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:18:23 PM

42

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:18:23 PM

2

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:18:23 PM

10

1364.50

XCSE

39


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:18:23 PM

11

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:18:23 PM

33

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:18:23 PM

73

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:18:23 PM

2

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:18:23 PM

25

1364.00

TQEX

GENMAB A/S

26-Mar-25

3:18:23 PM

8

1364.00

AQEU

GENMAB A/S

26-Mar-25

3:18:23 PM

15

1364.00

AQEU

GENMAB A/S

26-Mar-25

3:18:58 PM

5

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:18:59 PM

23

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:19:03 PM

36

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:19:05 PM

23

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:19:09 PM

22

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:19:26 PM

1

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:19:46 PM

12

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:19:46 PM

10

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:19:46 PM

13

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:19:53 PM

11

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:19:53 PM

2

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:20:02 PM

60

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:20:02 PM

14

1364.00

TQEX

GENMAB A/S

26-Mar-25

3:20:02 PM

17

1364.00

TQEX

GENMAB A/S

26-Mar-25

3:20:02 PM

33

1364.00

AQEU

GENMAB A/S

26-Mar-25

3:20:47 PM

26

1364.00

AQEU

GENMAB A/S

26-Mar-25

3:21:07 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:21:07 PM

69

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:21:07 PM

42

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:21:07 PM

69

1363.50

XCSE

GENMAB A/S

26-Mar-25

3:21:07 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:21:07 PM

2

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:21:07 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

3:21:07 PM

22

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:21:07 PM

36

1362.00

CEUX

GENMAB A/S

26-Mar-25

3:21:07 PM

4

1363.00

CEUX

GENMAB A/S

26-Mar-25

3:21:07 PM

3

1362.00

CEUX

GENMAB A/S

26-Mar-25

3:21:07 PM

32

1363.00

CEUX

GENMAB A/S

26-Mar-25

3:21:07 PM

68

1363.00

CEUX

GENMAB A/S

26-Mar-25

3:21:07 PM

4

1362.00

CEUX

GENMAB A/S

26-Mar-25

3:21:07 PM

25

1362.00

CEUX

GENMAB A/S

26-Mar-25

3:21:07 PM

2

1362.00

CEUX

GENMAB A/S

26-Mar-25

3:21:07 PM

9

1363.00

TQEX

GENMAB A/S

26-Mar-25

3:21:07 PM

16

1363.00

TQEX

GENMAB A/S

26-Mar-25

3:21:29 PM

10

1363.50

CEUX

GENMAB A/S

26-Mar-25

3:21:44 PM

4

1363.50

CEUX

GENMAB A/S

26-Mar-25

3:22:00 PM

24

1363.50

CEUX

GENMAB A/S

26-Mar-25

3:22:00 PM

23

1363.50

CEUX

40


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:22:00 PM

10

1363.50

CEUX

GENMAB A/S

26-Mar-25

3:22:00 PM

25

1363.00

AQEU

GENMAB A/S

26-Mar-25

3:22:33 PM

31

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:22:33 PM

69

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:22:33 PM

10

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:22:33 PM

10

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:23:02 PM

12

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:24:03 PM

69

1363.50

CEUX

GENMAB A/S

26-Mar-25

3:24:13 PM

23

1363.50

TQEX

GENMAB A/S

26-Mar-25

3:25:26 PM

3

1363.50

XCSE

GENMAB A/S

26-Mar-25

3:25:26 PM

9

1363.50

XCSE

GENMAB A/S

26-Mar-25

3:25:26 PM

1

1363.50

XCSE

GENMAB A/S

26-Mar-25

3:25:26 PM

8

1363.50

CEUX

GENMAB A/S

26-Mar-25

3:25:26 PM

15

1363.50

CEUX

GENMAB A/S

26-Mar-25

3:25:37 PM

30

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:37 PM

42

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:37 PM

1

1363.50

XCSE

GENMAB A/S

26-Mar-25

3:25:37 PM

12

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:37 PM

72

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:37 PM

33

1363.50

XCSE

GENMAB A/S

26-Mar-25

3:25:37 PM

10

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:37 PM

1

1362.50

CEUX

GENMAB A/S

26-Mar-25

3:25:37 PM

10

1362.50

CEUX

GENMAB A/S

26-Mar-25

3:25:37 PM

4

1363.50

CEUX

GENMAB A/S

26-Mar-25

3:25:37 PM

10

1362.50

CEUX

GENMAB A/S

26-Mar-25

3:25:37 PM

2

1362.50

CEUX

GENMAB A/S

26-Mar-25

3:25:37 PM

10

1362.50

CEUX

GENMAB A/S

26-Mar-25

3:25:37 PM

20

1362.50

CEUX

GENMAB A/S

26-Mar-25

3:25:37 PM

4

1363.50

CEUX

GENMAB A/S

26-Mar-25

3:25:42 PM

11

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:42 PM

12

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:42 PM

30

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:42 PM

11

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:42 PM

11

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:42 PM

10

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:25:42 PM

22

1362.50

CEUX

GENMAB A/S

26-Mar-25

3:26:17 PM

30

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:26:17 PM

72

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:26:17 PM

42

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:26:17 PM

33

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:26:17 PM

36

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:26:17 PM

11

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:26:17 PM

11

1362.00

XCSE

GENMAB A/S

26-Mar-25

3:26:17 PM

65

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:26:17 PM

6

1361.50

CEUX

41


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:26:17 PM

25

1362.50

TQEX

GENMAB A/S

26-Mar-25

3:26:17 PM

44

1362.50

AQEU

GENMAB A/S

26-Mar-25

3:28:25 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:25 PM

4

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:28:31 PM

3

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

3

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

38

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

42

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

7

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

42

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:37 PM

15

1361.00

TQEX

GENMAB A/S

26-Mar-25

3:28:37 PM

1

1361.00

TQEX

GENMAB A/S

26-Mar-25

3:28:37 PM

10

1361.00

TQEX

GENMAB A/S

26-Mar-25

3:28:38 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:38 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:38 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:38 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:38 PM

30

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:39 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:28:44 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:03 PM

12

1361.00

CEUX

GENMAB A/S

26-Mar-25

3:29:03 PM

15

1361.00

CEUX

GENMAB A/S

26-Mar-25

3:29:20 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:20 PM

42

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:20 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:20 PM

24

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:20 PM

16

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:20 PM

38

1361.00

CEUX

GENMAB A/S

26-Mar-25

3:29:20 PM

6

1361.00

CEUX

GENMAB A/S

26-Mar-25

3:29:21 PM

40

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:21 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:21 PM

40

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:21 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:21 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:21 PM

40

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:21 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:21 PM

4

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:21 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:21 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:29:23 PM

71

1360.50

XCSE

42


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:29:35 PM

1

1360.50

AQEU

GENMAB A/S

26-Mar-25

3:29:47 PM

2

1361.50

CEUX

GENMAB A/S

26-Mar-25

3:30:05 PM

17

1360.50

XCSE

GENMAB A/S

26-Mar-25

3:30:05 PM

71

1359.50

XCSE

GENMAB A/S

26-Mar-25

3:30:05 PM

69

1361.50

XCSE

GENMAB A/S

26-Mar-25

3:30:05 PM

28

1360.50

XCSE

GENMAB A/S

26-Mar-25

3:30:05 PM

30

1360.50

XCSE

GENMAB A/S

26-Mar-25

3:30:05 PM

72

1360.00

CEUX

GENMAB A/S

26-Mar-25

3:30:05 PM

17

1359.50

CEUX

GENMAB A/S

26-Mar-25

3:30:05 PM

50

1359.50

CEUX

GENMAB A/S

26-Mar-25

3:30:05 PM

75

1361.00

CEUX

GENMAB A/S

26-Mar-25

3:30:05 PM

7

1359.50

CEUX

GENMAB A/S

26-Mar-25

3:30:05 PM

23

1361.00

TQEX

GENMAB A/S

26-Mar-25

3:30:05 PM

3

1359.50

TQEX

GENMAB A/S

26-Mar-25

3:30:05 PM

31

1361.50

AQEU

GENMAB A/S

26-Mar-25

3:31:40 PM

18

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:01 PM

4

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:01 PM

18

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:01 PM

30

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:01 PM

42

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:01 PM

1

1360.00

XCSE

GENMAB A/S

26-Mar-25

3:32:01 PM

4

1360.00

CEUX

GENMAB A/S

26-Mar-25

3:32:01 PM

23

1360.50

TQEX

GENMAB A/S

26-Mar-25

3:32:01 PM

1

1360.50

AQEU

GENMAB A/S

26-Mar-25

3:32:01 PM

27

1360.50

AQEU

GENMAB A/S

26-Mar-25

3:32:02 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

42

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

26

1360.50

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

32

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

6

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

42

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:02 PM

12

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:04 PM

18

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:04 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:04 PM

42

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:04 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:04 PM

12

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:11 PM

12

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:11 PM

12

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:11 PM

42

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:11 PM

17

1361.00

XCSE

43


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:32:11 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:26 PM

12

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:26 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:26 PM

21

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:32:26 PM

25

1361.00

XCSE

GENMAB A/S

26-Mar-25

3:34:27 PM

73

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:34:27 PM

70

1363.00

CEUX

GENMAB A/S

26-Mar-25

3:34:56 PM

70

1363.00

XCSE

GENMAB A/S

26-Mar-25

3:36:25 PM

2

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:36:26 PM

2

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:36:27 PM

3

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:36:52 PM

6

1364.00

AQEU

GENMAB A/S

26-Mar-25

3:37:11 PM

36

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:38:20 PM

42

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:38:20 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:38:20 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:38:20 PM

13

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:38:20 PM

29

1366.00

TQEX

GENMAB A/S

26-Mar-25

3:38:20 PM

14

1365.00

TQEX

GENMAB A/S

26-Mar-25

3:39:37 PM

74

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:39:49 PM

13

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:39:49 PM

3

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:40:00 PM

35

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:40:00 PM

12

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:40:00 PM

12

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:40:00 PM

50

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:40:00 PM

20

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:40:00 PM

9

1365.00

TQEX

GENMAB A/S

26-Mar-25

3:40:00 PM

24

1366.00

TQEX

GENMAB A/S

26-Mar-25

3:40:00 PM

36

1366.00

AQEU

GENMAB A/S

26-Mar-25

3:40:29 PM

10

1365.00

AQEU

GENMAB A/S

26-Mar-25

3:41:26 PM

8

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:41:57 PM

2

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:41:57 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:41:57 PM

4

1365.50

CEUX

GENMAB A/S

26-Mar-25

3:42:25 PM

1

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:42:25 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:42:25 PM

2

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:42:25 PM

1

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:42:27 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:42:27 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:42:27 PM

2

1365.50

CEUX

GENMAB A/S

26-Mar-25

3:42:28 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:42:28 PM

5

1365.50

CEUX

GENMAB A/S

26-Mar-25

3:42:37 PM

94

1365.50

XCSE

44


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:43:26 PM

2

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:44:26 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:44:26 PM

36

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:44:27 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:44:27 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:44:27 PM

2

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:44:27 PM

12

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:44:27 PM

4

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:44:27 PM

4

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

42

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:44:49 PM

12

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:44:49 PM

72

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:44:49 PM

29

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:44:49 PM

69

1364.00

XCSE

GENMAB A/S

26-Mar-25

3:44:49 PM

11

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:44:49 PM

7

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

5

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

8

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

6

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

2

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

7

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

8

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

18

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

15

1365.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

5

1364.50

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

2

1364.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

59

1365.00

CEUX

GENMAB A/S

26-Mar-25

3:44:49 PM

9

1364.00

TQEX

GENMAB A/S

26-Mar-25

3:44:49 PM

7

1364.00

TQEX

GENMAB A/S

26-Mar-25

3:44:49 PM

23

1364.00

TQEX

GENMAB A/S

26-Mar-25

3:44:49 PM

25

1365.50

TQEX

GENMAB A/S

26-Mar-25

3:44:49 PM

13

1365.00

AQEU

GENMAB A/S

26-Mar-25

3:44:50 PM

20

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:44:51 PM

50

1364.50

XCSE

GENMAB A/S

26-Mar-25

3:45:20 PM

3

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:45:20 PM

55

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:45:20 PM

17

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:45:20 PM

36

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:45:20 PM

37

1366.00

AQEU

GENMAB A/S

26-Mar-25

3:46:08 PM

72

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:46:08 PM

34

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:46:08 PM

40

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:46:20 PM

72

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:46:20 PM

71

1367.50

CEUX

GENMAB A/S

26-Mar-25

3:46:20 PM

24

1367.50

TQEX

45


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:46:27 PM

9

1367.50

CEUX

GENMAB A/S

26-Mar-25

3:46:58 PM

8

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:46:58 PM

14

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:46:58 PM

42

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:46:58 PM

30

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:46:58 PM

75

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:46:58 PM

36

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:46:58 PM

20

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:46:58 PM

36

1367.50

CEUX

GENMAB A/S

26-Mar-25

3:46:58 PM

4

1367.50

CEUX

GENMAB A/S

26-Mar-25

3:46:58 PM

50

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:46:58 PM

17

1367.00

AQEU

GENMAB A/S

26-Mar-25

3:46:58 PM

6

1367.00

AQEU

GENMAB A/S

26-Mar-25

3:46:59 PM

42

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:46:59 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:46:59 PM

22

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:46:59 PM

4

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:46:59 PM

5

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:47:25 PM

2

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:47:25 PM

3

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:47:25 PM

3

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:48:05 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:05 PM

11

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:48:05 PM

40

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:05 PM

10

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:48:05 PM

2

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:48:05 PM

10

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:48:05 PM

45

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:48:05 PM

24

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:48:05 PM

40

1367.00

TQEX

GENMAB A/S

26-Mar-25

3:48:05 PM

13

1367.00

AQEU

GENMAB A/S

26-Mar-25

3:48:05 PM

10

1367.00

AQEU

GENMAB A/S

26-Mar-25

3:48:11 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:11 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:11 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:11 PM

4

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:48:11 PM

36

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:48:11 PM

5

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:48:14 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:14 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:14 PM

4

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:48:14 PM

36

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:48:14 PM

4

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:48:23 PM

3

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:23 PM

7

1367.00

XCSE

46


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:48:23 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:23 PM

42

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:23 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:24 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:24 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:24 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:24 PM

7

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:24 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:25 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:26 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:26 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:26 PM

41

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:26 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:26 PM

4

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:48:26 PM

5

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:48:27 PM

12

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:48:28 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:28 PM

42

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:28 PM

1

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:28 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:29 PM

70

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:48:29 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:29 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:29 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:48:29 PM

8

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:48:29 PM

36

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:48:29 PM

25

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:48:29 PM

4

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:48:29 PM

63

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:48:29 PM

5

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:48:29 PM

12

1366.00

AQEU

GENMAB A/S

26-Mar-25

3:48:29 PM

11

1366.00

AQEU

GENMAB A/S

26-Mar-25

3:49:26 PM

2

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:49:38 PM

27

1366.00

AQEU

GENMAB A/S

26-Mar-25

3:49:40 PM

29

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:49:40 PM

25

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:49:44 PM

12

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:49:44 PM

12

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:49:44 PM

10

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:49:44 PM

10

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:49:44 PM

1

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:50:14 PM

2

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

21

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

16

1365.00

XCSE

47


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:50:50 PM

2

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

55

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

5

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

59

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

34

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

10

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

42

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

45

1365.00

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

3:50:50 PM

65

1365.00

CEUX

GENMAB A/S

26-Mar-25

3:50:50 PM

5

1365.00

CEUX

GENMAB A/S

26-Mar-25

3:50:50 PM

24

1364.50

AQEU

GENMAB A/S

26-Mar-25

3:51:52 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:51:52 PM

2

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:51:52 PM

11

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:51:52 PM

41

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:04 PM

42

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:04 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:04 PM

42

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:04 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:04 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:05 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:05 PM

12

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:05 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:05 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:07 PM

11

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:07 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:08 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:08 PM

11

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:14 PM

11

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:14 PM

42

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:14 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:15 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:15 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:21 PM

12

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:21 PM

11

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:24 PM

4

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:52:49 PM

12

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:53:32 PM

74

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:53:32 PM

9

1366.50

TQEX

GENMAB A/S

26-Mar-25

3:53:32 PM

23

1366.50

TQEX

GENMAB A/S

26-Mar-25

3:53:32 PM

43

1366.50

AQEU

GENMAB A/S

26-Mar-25

3:53:59 PM

36

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:54:06 PM

9

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:54:06 PM

94

1367.00

XCSE

48


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:54:06 PM

34

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:54:06 PM

9

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:54:06 PM

42

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:54:07 PM

94

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:54:07 PM

94

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:54:07 PM

94

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:54:08 PM

38

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:54:08 PM

11

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:54:08 PM

11

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:54:08 PM

14

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:54:08 PM

94

1367.00

XCSE

GENMAB A/S

26-Mar-25

3:54:08 PM

36

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:54:08 PM

5

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:54:08 PM

23

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:54:09 PM

4

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:54:09 PM

4

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:54:14 PM

8

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:54:14 PM

65

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:54:14 PM

10

1366.50

XCSE

GENMAB A/S

26-Mar-25

3:54:14 PM

36

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:54:14 PM

2

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:54:26 PM

4

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:54:26 PM

30

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:54:26 PM

23

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:55:26 PM

10

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:55:30 PM

36

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:55:40 PM

22

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:55:45 PM

66

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:56:03 PM

13

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:56:13 PM

32

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:56:14 PM

4

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:56:14 PM

5

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:56:21 PM

2

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:56:21 PM

71

1366.00

CEUX

GENMAB A/S

26-Mar-25

3:56:25 PM

2

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:25 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:25 PM

12

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:25 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:26 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:26 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:27 PM

20

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:27 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:27 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:27 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:27 PM

12

1366.00

XCSE

49


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

3:56:34 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:34 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:56:34 PM

1

1366.00

XCSE

GENMAB A/S

26-Mar-25

3:58:05 PM

12

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:58:05 PM

8

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:58:05 PM

10

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:58:05 PM

12

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:58:06 PM

10

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:58:09 PM

59

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:58:34 PM

45

1367.00

CEUX

GENMAB A/S

26-Mar-25

3:59:12 PM

34

1366.50

CEUX

GENMAB A/S

26-Mar-25

3:59:59 PM

12

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:59:59 PM

49

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:59:59 PM

11

1367.50

XCSE

GENMAB A/S

26-Mar-25

3:59:59 PM

9

1367.50

CEUX

GENMAB A/S

26-Mar-25

3:59:59 PM

24

1367.50

CEUX

GENMAB A/S

26-Mar-25

3:59:59 PM

27

1367.50

CEUX

GENMAB A/S

26-Mar-25

3:59:59 PM

6

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:00:00 PM

10

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:00:00 PM

10

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:00:03 PM

65

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:00:03 PM

2

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:00:03 PM

16

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:00:03 PM

58

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:00:04 PM

30

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:00:05 PM

1

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:00:05 PM

1

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:00:09 PM

18

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:01:00 PM

71

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:01:01 PM

65

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:01:01 PM

12

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:01:01 PM

17

1368.50

AQEU

GENMAB A/S

26-Mar-25

4:01:01 PM

13

1368.50

AQEU

GENMAB A/S

26-Mar-25

4:01:25 PM

32

1368.50

CEUX

GENMAB A/S

26-Mar-25

4:01:26 PM

23

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:01:28 PM

12

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:01:28 PM

10

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:01:28 PM

9

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:02:01 PM

2

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:02:01 PM

24

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:02:01 PM

39

1369.00

CEUX

GENMAB A/S

26-Mar-25

4:02:01 PM

34

1369.00

CEUX

GENMAB A/S

26-Mar-25

4:02:01 PM

41

1369.00

TQEX

GENMAB A/S

26-Mar-25

4:02:01 PM

34

1369.00

AQEU

GENMAB A/S

26-Mar-25

4:02:12 PM

30

1369.00

XCSE

50


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:02:12 PM

41

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:02:12 PM

39

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:02:12 PM

25

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:02:12 PM

34

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:02:34 PM

58

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:02:34 PM

10

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:02:34 PM

26

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:02:34 PM

23

1368.50

CEUX

GENMAB A/S

26-Mar-25

4:02:36 PM

11

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:02:36 PM

12

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:03:13 PM

26

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:03:13 PM

12

1369.00

XCSE

GENMAB A/S

26-Mar-25

4:03:13 PM

72

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:03:26 PM

29

1368.50

CEUX

GENMAB A/S

26-Mar-25

4:03:27 PM

2

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:03:41 PM

50

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:03:41 PM

22

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:03:41 PM

50

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:03:41 PM

1

1368.00

CEUX

GENMAB A/S

26-Mar-25

4:03:41 PM

73

1368.00

CEUX

GENMAB A/S

26-Mar-25

4:03:41 PM

15

1368.00

TQEX

GENMAB A/S

26-Mar-25

4:03:41 PM

21

1368.00

TQEX

GENMAB A/S

26-Mar-25

4:03:41 PM

30

1368.00

AQEU

GENMAB A/S

26-Mar-25

4:03:56 PM

1

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:03:56 PM

69

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:03:56 PM

22

1367.00

TQEX

GENMAB A/S

26-Mar-25

4:03:56 PM

33

1367.50

AQEU

GENMAB A/S

26-Mar-25

4:03:57 PM

9

1367.00

TQEX

GENMAB A/S

26-Mar-25

4:04:05 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:05 PM

64

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:05 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:05 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:06 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:06 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:06 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:06 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:06 PM

1

1366.50

CEUX

GENMAB A/S

26-Mar-25

4:04:06 PM

1

1366.50

CEUX

GENMAB A/S

26-Mar-25

4:04:07 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:07 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:07 PM

75

1366.50

XCSE

GENMAB A/S

26-Mar-25

4:04:07 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:07 PM

2

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:07 PM

10

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:07 PM

10

1367.00

XCSE

51


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:04:07 PM

34

1366.50

CEUX

GENMAB A/S

26-Mar-25

4:04:08 PM

25

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:08 PM

34

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:08 PM

30

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:08 PM

13

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:08 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:08 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:08 PM

25

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:08 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:08 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:08 PM

15

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:09 PM

52

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:09 PM

12

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:09 PM

19

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:09 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:15 PM

7

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:15 PM

65

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:15 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:15 PM

11

1367.00

XCSE

GENMAB A/S

26-Mar-25

4:04:22 PM

1

1365.50

CEUX

GENMAB A/S

26-Mar-25

4:04:22 PM

35

1366.00

TQEX

GENMAB A/S

26-Mar-25

4:05:26 PM

10

1366.50

CEUX

GENMAB A/S

26-Mar-25

4:05:26 PM

49

1366.50

CEUX

GENMAB A/S

26-Mar-25

4:06:21 PM

34

1368.00

AQEU

GENMAB A/S

26-Mar-25

4:06:26 PM

24

1368.00

CEUX

GENMAB A/S

26-Mar-25

4:06:26 PM

30

1368.00

CEUX

GENMAB A/S

26-Mar-25

4:06:48 PM

10

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:06:48 PM

2

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:06:48 PM

11

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:06:48 PM

37

1368.50

XCSE

GENMAB A/S

26-Mar-25

4:07:03 PM

47

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:07:03 PM

25

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:07:03 PM

42

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:07:03 PM

27

1367.50

TQEX

GENMAB A/S

26-Mar-25

4:07:03 PM

15

1367.50

TQEX

GENMAB A/S

26-Mar-25

4:07:25 PM

4

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:08:13 PM

2

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:08:13 PM

23

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:08:15 PM

12

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:08:15 PM

2

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:08:15 PM

12

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:08:15 PM

36

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:08:20 PM

3

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:08:29 PM

23

1367.50

AQEU

GENMAB A/S

26-Mar-25

4:08:31 PM

11

1367.50

XCSE

52


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:08:31 PM

12

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:08:31 PM

36

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:08:31 PM

4

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:09:26 PM

74

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:09:26 PM

2

1367.50

XCSE

GENMAB A/S

26-Mar-25

4:09:26 PM

75

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:09:26 PM

52

1367.50

CEUX

GENMAB A/S

26-Mar-25

4:09:26 PM

27

1367.50

TQEX

GENMAB A/S

26-Mar-25

4:10:24 PM

1

1366.50

CEUX

GENMAB A/S

26-Mar-25

4:10:25 PM

1

1366.50

XCSE

GENMAB A/S

26-Mar-25

4:10:30 PM

1

1367.00

TQEX

GENMAB A/S

26-Mar-25

4:10:30 PM

6

1367.00

TQEX

GENMAB A/S

26-Mar-25

4:10:30 PM

27

1367.00

TQEX

GENMAB A/S

26-Mar-25

4:10:47 PM

36

1367.00

CEUX

GENMAB A/S

26-Mar-25

4:10:47 PM

29

1367.00

CEUX

GENMAB A/S

26-Mar-25

4:10:47 PM

40

1367.00

AQEU

GENMAB A/S

26-Mar-25

4:10:51 PM

1

1366.50

CEUX

GENMAB A/S

26-Mar-25

4:10:56 PM

34

1366.50

XCSE

GENMAB A/S

26-Mar-25

4:10:56 PM

8

1366.50

XCSE

GENMAB A/S

26-Mar-25

4:10:56 PM

26

1366.50

XCSE

GENMAB A/S

26-Mar-25

4:10:56 PM

9

1366.50

CEUX

GENMAB A/S

26-Mar-25

4:11:37 PM

54

1365.50

CEUX

GENMAB A/S

26-Mar-25

4:11:37 PM

11

1365.50

CEUX

GENMAB A/S

26-Mar-25

4:11:38 PM

3

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:11:38 PM

25

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:11:38 PM

7

1365.50

CEUX

GENMAB A/S

26-Mar-25

4:12:12 PM

1

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:12 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:12 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:12 PM

50

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:12 PM

8

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:12 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:12 PM

48

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:12 PM

6

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:12 PM

44

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:13 PM

1

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:13 PM

48

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:13 PM

3

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:13 PM

9

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:13 PM

10

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:13 PM

12

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:13 PM

3

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:13 PM

9

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:15 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:15 PM

10

1366.00

XCSE

53


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:12:18 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:18 PM

11

1366.00

XCSE

GENMAB A/S

26-Mar-25

4:12:18 PM

2

1366.00

CEUX

GENMAB A/S

26-Mar-25

4:12:18 PM

12

1366.00

CEUX

GENMAB A/S

26-Mar-25

4:12:18 PM

33

1366.00

CEUX

GENMAB A/S

26-Mar-25

4:12:18 PM

6

1366.00

CEUX

GENMAB A/S

26-Mar-25

4:13:05 PM

41

1365.50

CEUX

GENMAB A/S

26-Mar-25

4:13:05 PM

34

1365.50

CEUX

GENMAB A/S

26-Mar-25

4:13:11 PM

24

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:11 PM

22

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:11 PM

48

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:12 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:12 PM

1

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:12 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:12 PM

5

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:12 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:12 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:12 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:12 PM

30

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:13 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:13 PM

3

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:13 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:14 PM

3

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:14 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:14 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:14 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:14 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:14 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:14 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:16 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:16 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:16 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:16 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:18 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:19 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:22 PM

75

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:22 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:22 PM

32

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:22 PM

50

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:23 PM

34

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:23 PM

31

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:23 PM

23

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:23 PM

18

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:23 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:13:23 PM

10

1365.50

XCSE

54


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:13:23 PM

36

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:26 PM

1

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:26 PM

42

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:26 PM

35

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:26 PM

13

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:26 PM

23

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:26 PM

35

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:26 PM

11

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:26 PM

12

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:27 PM

10

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:27 PM

10

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:35 PM

2

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:35 PM

17

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:13:44 PM

27

1365.00

CEUX

GENMAB A/S

26-Mar-25

4:13:44 PM

20

1365.00

CEUX

GENMAB A/S

26-Mar-25

4:13:45 PM

10

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:14:26 PM

2

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:14:26 PM

29

1365.00

CEUX

GENMAB A/S

26-Mar-25

4:14:31 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:14:31 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:14:33 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:14:33 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:01 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:01 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:03 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:03 PM

2

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:03 PM

7

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:04 PM

9

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:11 PM

1

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:11 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:12 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:12 PM

48

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:12 PM

11

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:16 PM

10

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:16 PM

48

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:19 PM

12

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:23 PM

23

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:24 PM

1

1365.50

XCSE

GENMAB A/S

26-Mar-25

4:15:24 PM

20

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:15:24 PM

51

1365.00

XCSE

GENMAB A/S

26-Mar-25

4:15:24 PM

73

1365.00

CEUX

GENMAB A/S

26-Mar-25

4:15:24 PM

1

1365.00

AQEU

GENMAB A/S

26-Mar-25

4:15:24 PM

7

1365.00

AQEU

GENMAB A/S

26-Mar-25

4:15:25 PM

8

1364.00

XCSE

GENMAB A/S

26-Mar-25

4:15:25 PM

10

1364.00

CEUX

55


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:15:25 PM

10

1364.00

CEUX

GENMAB A/S

26-Mar-25

4:15:25 PM

2

1364.00

CEUX

GENMAB A/S

26-Mar-25

4:15:25 PM

6

1365.00

AQEU

GENMAB A/S

26-Mar-25

4:15:25 PM

9

1365.00

AQEU

GENMAB A/S

26-Mar-25

4:16:10 PM

61

1364.00

XCSE

GENMAB A/S

26-Mar-25

4:16:10 PM

10

1364.50

XCSE

GENMAB A/S

26-Mar-25

4:16:10 PM

50

1364.00

CEUX

GENMAB A/S

26-Mar-25

4:16:10 PM

34

1364.00

TQEX

GENMAB A/S

26-Mar-25

4:16:10 PM

10

1364.50

AQEU

GENMAB A/S

26-Mar-25

4:16:14 PM

7

1364.50

AQEU

GENMAB A/S

26-Mar-25

4:16:26 PM

5

1364.00

CEUX

GENMAB A/S

26-Mar-25

4:16:39 PM

73

1364.00

XCSE

GENMAB A/S

26-Mar-25

4:16:39 PM

37

1364.00

CEUX

GENMAB A/S

26-Mar-25

4:16:39 PM

34

1364.00

CEUX

GENMAB A/S

26-Mar-25

4:16:39 PM

26

1364.00

TQEX

GENMAB A/S

26-Mar-25

4:16:55 PM

48

1364.00

XCSE

GENMAB A/S

26-Mar-25

4:16:55 PM

11

1364.00

XCSE

GENMAB A/S

26-Mar-25

4:17:12 PM

71

1363.00

XCSE

GENMAB A/S

26-Mar-25

4:17:12 PM

68

1363.50

CEUX

GENMAB A/S

26-Mar-25

4:17:12 PM

25

1362.50

CEUX

GENMAB A/S

26-Mar-25

4:17:12 PM

31

1362.50

CEUX

GENMAB A/S

26-Mar-25

4:17:12 PM

7

1362.50

CEUX

GENMAB A/S

26-Mar-25

4:17:12 PM

10

1362.50

CEUX

GENMAB A/S

26-Mar-25

4:17:12 PM

41

1363.50

AQEU

GENMAB A/S

26-Mar-25

4:17:24 PM

27

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:17:24 PM

32

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:17:24 PM

8

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:17:24 PM

2

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:17:30 PM

2

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:17:30 PM

26

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:17:30 PM

10

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:17:30 PM

26

1362.00

TQEX

GENMAB A/S

26-Mar-25

4:18:05 PM

33

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:18:05 PM

47

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

16

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

27

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

20

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

39

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

12

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

14

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

50

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

2

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

8

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:18:25 PM

69

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:18:25 PM

28

1360.00

CEUX

56


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:18:26 PM

23

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:18:26 PM

24

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:19:33 PM

25

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:19:52 PM

9

1359.50

CEUX

GENMAB A/S

26-Mar-25

4:19:52 PM

14

1359.50

CEUX

GENMAB A/S

26-Mar-25

4:20:05 PM

48

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:20:05 PM

3

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:20:05 PM

43

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:20:35 PM

2

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:20:35 PM

48

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:20:35 PM

8

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:20:50 PM

1

1359.00

XCSE

GENMAB A/S

26-Mar-25

4:21:25 PM

3

1359.50

AQEU

GENMAB A/S

26-Mar-25

4:21:30 PM

7

1359.50

AQEU

GENMAB A/S

26-Mar-25

4:22:16 PM

41

1360.50

TQEX

GENMAB A/S

26-Mar-25

4:22:40 PM

71

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:22:40 PM

72

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:22:41 PM

26

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:22:41 PM

48

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:22:55 PM

36

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:22:55 PM

36

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:22:55 PM

10

1360.50

AQEU

GENMAB A/S

26-Mar-25

4:22:56 PM

50

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:23:11 PM

4

1360.50

TQEX

GENMAB A/S

26-Mar-25

4:23:55 PM

23

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:23:55 PM

10

1360.50

AQEU

GENMAB A/S

26-Mar-25

4:23:56 PM

2

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:23:56 PM

5

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:23:56 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:24:32 PM

9

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:24:32 PM

85

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:24:38 PM

5

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:24:57 PM

74

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:24:57 PM

36

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:24:57 PM

27

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:24:57 PM

1

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:24:57 PM

1

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:24:57 PM

27

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:25:04 PM

7

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:25:04 PM

17

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:25:09 PM

48

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:25:09 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:25:09 PM

32

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:25:09 PM

73

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:25:09 PM

10

1361.50

AQEU

57


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:25:09 PM

15

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:25:39 PM

14

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:25:39 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:25:40 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:26:25 PM

7

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:26:25 PM

3

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:26:25 PM

35

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:26:25 PM

32

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:27:21 PM

72

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:27:32 PM

10

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:27:34 PM

10

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:27:34 PM

28

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:27:34 PM

48

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:27:34 PM

8

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:27:34 PM

3

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:27:34 PM

16

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:27:34 PM

50

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:27:34 PM

1

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:27:34 PM

50

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:27:34 PM

21

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:27:34 PM

72

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:27:34 PM

2

1360.00

TQEX

GENMAB A/S

26-Mar-25

4:27:34 PM

4

1360.00

TQEX

GENMAB A/S

26-Mar-25

4:27:34 PM

23

1360.00

TQEX

GENMAB A/S

26-Mar-25

4:27:34 PM

2

1360.00

TQEX

GENMAB A/S

26-Mar-25

4:27:34 PM

13

1360.00

TQEX

GENMAB A/S

26-Mar-25

4:27:34 PM

27

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:27:58 PM

30

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:27:58 PM

43

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:27:58 PM

8

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:28:00 PM

7

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:28:00 PM

19

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:28:26 PM

44

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:28:32 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

10

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

39

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

10

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

24

1359.00

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

12

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

48

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

12

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

12

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

45

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:04 PM

39

1359.50

CEUX

GENMAB A/S

26-Mar-25

4:29:04 PM

1

1358.50

CEUX

58


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:29:05 PM

16

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:05 PM

12

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:05 PM

45

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:05 PM

9

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:05 PM

12

1359.50

XCSE

GENMAB A/S

26-Mar-25

4:29:07 PM

18

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:29:07 PM

53

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:29:26 PM

2

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:30:06 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:06 PM

6

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:06 PM

2

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:06 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:06 PM

14

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:06 PM

48

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

8

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

2

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

36

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

10

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

1

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

50

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

34

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

1

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

1

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

10

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

10

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

40

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

10

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

8

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:07 PM

38

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:30:08 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:30:08 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:30:08 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:30:23 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:23 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:23 PM

37

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:23 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:23 PM

35

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:23 PM

2

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:23 PM

10

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:25 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:25 PM

11

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:35 PM

11

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:35 PM

12

1360.50

XCSE

59


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:30:45 PM

10

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:45 PM

11

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:30:45 PM

36

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:30:59 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:30:59 PM

70

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:31:05 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:31:05 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:31:05 PM

25

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:31:05 PM

48

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:31:08 PM

25

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:31:11 PM

16

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:31:37 PM

15

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:31:44 PM

1

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:31:44 PM

5

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:32:24 PM

38

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:32:24 PM

1

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:32:25 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:33:23 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:23 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:23 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:23 PM

46

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:23 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:23 PM

34

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:23 PM

4

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:24 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:24 PM

23

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:24 PM

48

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:24 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:25 PM

48

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:33:25 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:34:08 PM

9

1362.00

TQEX

GENMAB A/S

26-Mar-25

4:34:08 PM

25

1362.00

TQEX

GENMAB A/S

26-Mar-25

4:34:14 PM

32

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:34:14 PM

38

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:34:14 PM

34

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:36:16 PM

75

1362.50

CEUX

GENMAB A/S

26-Mar-25

4:36:16 PM

28

1362.50

TQEX

GENMAB A/S

26-Mar-25

4:36:16 PM

33

1362.50

AQEU

GENMAB A/S

26-Mar-25

4:36:26 PM

22

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:26 PM

1

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:26 PM

48

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:26 PM

23

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:27 PM

23

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:27 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:27 PM

12

1362.50

XCSE

60


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:36:27 PM

48

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:29 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:29 PM

16

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:29 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:31 PM

12

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:31 PM

13

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:31 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:32 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:32 PM

12

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:32 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:32 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:36 PM

35

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:36 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:36 PM

48

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:36 PM

7

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:36 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:36 PM

12

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:36 PM

30

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:36 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:37 PM

31

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:37 PM

41

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:37 PM

40

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:37 PM

12

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:37 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:37 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:37 PM

3

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:37 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:37 PM

30

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:38 PM

45

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:38 PM

11

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:38 PM

12

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:36:38 PM

26

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:37:05 PM

12

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:37:05 PM

9

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:37:05 PM

10

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:37:05 PM

30

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:37:05 PM

26

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:37:18 PM

2

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:37:18 PM

10

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:37:18 PM

38

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:37:25 PM

10

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:37:26 PM

22

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:37:27 PM

53

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:37:27 PM

28

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:37:27 PM

28

1362.00

CEUX

61


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:38:12 PM

30

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:38:26 PM

2

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:38:26 PM

43

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:38:29 PM

22

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:38:54 PM

38

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:38:54 PM

9

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:39:09 PM

38

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:39:18 PM

12

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:39:24 PM

11

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:39:24 PM

38

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:39:25 PM

74

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:39:25 PM

75

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:39:26 PM

3

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:39:26 PM

27

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:39:26 PM

38

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:39:26 PM

11

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:40:27 PM

3

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:40:27 PM

7

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:40:27 PM

23

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:40:27 PM

42

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:40:27 PM

3

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:40:27 PM

39

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:40:27 PM

38

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:40:27 PM

27

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:40:28 PM

25

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:40:28 PM

49

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:41:11 PM

1

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:11 PM

27

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:22 PM

17

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:41:25 PM

22

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:41:25 PM

26

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:41:35 PM

48

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:35 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:35 PM

47

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:35 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:35 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:35 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:35 PM

1

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:35 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:35 PM

25

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:35 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:36 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:36 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:36 PM

48

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:36 PM

11

1361.50

XCSE

62


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:41:36 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:37 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:37 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:40 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:40 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:41 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:42 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:42 PM

24

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:42 PM

48

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:42 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:44 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:41:57 PM

39

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:42:25 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:42:35 PM

20

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:43:26 PM

41

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:43:26 PM

2

1362.00

XCSE

GENMAB A/S

26-Mar-25

4:43:26 PM

19

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:44:27 PM

7

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:44:29 PM

18

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:44:44 PM

9

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:45:04 PM

38

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:45:04 PM

12

1362.00

TQEX

GENMAB A/S

26-Mar-25

4:45:19 PM

26

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:46:35 PM

28

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:46:35 PM

46

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:46:35 PM

1

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:46:35 PM

70

1362.50

XCSE

GENMAB A/S

26-Mar-25

4:46:35 PM

72

1362.50

CEUX

GENMAB A/S

26-Mar-25

4:46:35 PM

38

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:46:35 PM

3

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:46:35 PM

12

1362.50

TQEX

GENMAB A/S

26-Mar-25

4:46:35 PM

2

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:46:35 PM

8

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:46:35 PM

15

1362.50

TQEX

GENMAB A/S

26-Mar-25

4:46:35 PM

2

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:46:35 PM

2

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:46:35 PM

6

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:46:35 PM

23

1362.50

TQEX

GENMAB A/S

26-Mar-25

4:46:35 PM

2

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:46:35 PM

22

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:46:36 PM

2

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:46:38 PM

29

1362.00

CEUX

GENMAB A/S

26-Mar-25

4:47:16 PM

46

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:47:36 PM

2

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:47:36 PM

12

1362.00

AQEU

63


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:47:36 PM

2

1362.00

AQEU

GENMAB A/S

26-Mar-25

4:47:40 PM

4

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:47:40 PM

5

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:47:41 PM

23

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:47:41 PM

28

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:47:41 PM

5

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:47:41 PM

5

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:48:04 PM

33

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:04 PM

38

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:48:04 PM

2

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:48:04 PM

2

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:48:04 PM

12

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:48:04 PM

2

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:48:04 PM

2

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:48:05 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:05 PM

8

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:09 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:09 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:09 PM

11

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:09 PM

2

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:48:09 PM

2

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:48:27 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:27 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:27 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:27 PM

21

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:27 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:27 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:27 PM

12

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:48:27 PM

2

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:48:27 PM

7

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:48:27 PM

2

1361.50

TQEX

GENMAB A/S

26-Mar-25

4:48:27 PM

2

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:48:27 PM

2

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:48:27 PM

11

1361.50

AQEU

GENMAB A/S

26-Mar-25

4:48:29 PM

12

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:29 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:36 PM

5

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:48:37 PM

4

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:48:43 PM

2

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:43 PM

10

1361.50

XCSE

GENMAB A/S

26-Mar-25

4:48:43 PM

4

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:48:43 PM

92

1361.50

CEUX

GENMAB A/S

26-Mar-25

4:48:43 PM

9

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:48:43 PM

16

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:48:44 PM

9

1361.00

XCSE

64


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:48:44 PM

42

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:48:44 PM

34

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:48:44 PM

48

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:48:44 PM

6

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:48:44 PM

39

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:48:44 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:48:44 PM

29

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:48:44 PM

4

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:48:44 PM

5

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:48:44 PM

38

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:44 PM

5

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:44 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:44 PM

5

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:44 PM

5

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:45 PM

5

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:45 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:45 PM

10

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:45 PM

2

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:45 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:45 PM

12

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:45 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:45 PM

38

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:45 PM

12

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:48:46 PM

41

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:49:05 PM

5

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:49:05 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:49:05 PM

38

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:49:11 PM

61

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:49:11 PM

8

1360.50

TQEX

GENMAB A/S

26-Mar-25

4:49:11 PM

25

1360.50

TQEX

GENMAB A/S

26-Mar-25

4:49:25 PM

57

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:49:40 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:49:40 PM

11

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:49:41 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:49:41 PM

10

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:50:01 PM

10

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:01 PM

5

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:01 PM

5

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:01 PM

2

1360.00

AQEU

GENMAB A/S

26-Mar-25

4:50:01 PM

2

1360.00

AQEU

GENMAB A/S

26-Mar-25

4:50:02 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:02 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:11 PM

4

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:11 PM

1

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:11 PM

3

1360.00

XCSE

65


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:50:11 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:11 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:11 PM

11

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:11 PM

4

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:11 PM

9

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:11 PM

4

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:12 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:12 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:12 PM

11

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:12 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:12 PM

4

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:12 PM

9

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:12 PM

4

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:12 PM

5

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:13 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:15 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:15 PM

4

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:17 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:17 PM

39

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:18 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:18 PM

11

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:19 PM

11

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:19 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:19 PM

39

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:20 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:20 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:20 PM

4

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:20 PM

4

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:20 PM

5

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:21 PM

2

1360.00

AQEU

GENMAB A/S

26-Mar-25

4:50:22 PM

10

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:22 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:22 PM

11

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:23 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:23 PM

12

1360.00

XCSE

GENMAB A/S

26-Mar-25

4:50:23 PM

10

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:23 PM

5

1360.00

CEUX

GENMAB A/S

26-Mar-25

4:50:23 PM

8

1360.00

TQEX

GENMAB A/S

26-Mar-25

4:50:23 PM

12

1360.00

AQEU

GENMAB A/S

26-Mar-25

4:50:23 PM

7

1360.00

AQEU

GENMAB A/S

26-Mar-25

4:50:23 PM

2

1360.00

AQEU

GENMAB A/S

26-Mar-25

4:50:23 PM

2

1360.00

AQEU

GENMAB A/S

26-Mar-25

4:51:03 PM

62

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:51:03 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:51:07 PM

74

1361.00

CEUX

66


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:51:24 PM

27

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:51:25 PM

55

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:51:41 PM

70

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:51:41 PM

71

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:51:41 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:51:41 PM

29

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:52:00 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:00 PM

3

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:00 PM

23

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:00 PM

48

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:00 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:00 PM

6

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:00 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:00 PM

2

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:00 PM

11

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:52:00 PM

12

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:52:03 PM

9

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:06 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:06 PM

12

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:06 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:52:06 PM

2

1361.00

AQEU

GENMAB A/S

26-Mar-25

4:52:13 PM

4

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:52:13 PM

2

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:52:27 PM

26

1360.50

AQEU

GENMAB A/S

26-Mar-25

4:53:11 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:11 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:11 PM

3

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:11 PM

48

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:11 PM

94

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:11 PM

3

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:11 PM

6

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:12 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:12 PM

10

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:12 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:12 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:12 PM

48

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:42 PM

10

1360.50

AQEU

GENMAB A/S

26-Mar-25

4:53:55 PM

22

1360.50

AQEU

GENMAB A/S

26-Mar-25

4:53:57 PM

12

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:53:57 PM

24

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:53:57 PM

11

1360.50

XCSE

GENMAB A/S

26-Mar-25

4:53:57 PM

5

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:53:57 PM

5

1360.50

CEUX

GENMAB A/S

26-Mar-25

4:53:57 PM

2

1360.50

TQEX

GENMAB A/S

26-Mar-25

4:53:57 PM

20

1360.50

AQEU

67


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

26-Mar-25

4:53:57 PM

2

1360.50

AQEU

GENMAB A/S

26-Mar-25

4:53:58 PM

12

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:58 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:58 PM

11

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:53:58 PM

35

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:53:58 PM

5

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:53:58 PM

4

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:53:58 PM

15

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:53:58 PM

4

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:54:05 PM

75

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:54:05 PM

75

1361.00

CEUX

GENMAB A/S

26-Mar-25

4:54:10 PM

42

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:54:10 PM

33

1361.00

TQEX

GENMAB A/S

26-Mar-25

4:54:29 PM

10

1360.50

AQEU

GENMAB A/S

26-Mar-25

4:54:32 PM

75

1361.00

XCSE

GENMAB A/S

26-Mar-25

4:54:37 PM

25

1361.50

CEUX

GENMAB A/S

27-Mar-25

9:42:33 AM

49

1344.50

XCSE

GENMAB A/S

27-Mar-25

9:43:04 AM

69

1345.00

TQEX

GENMAB A/S

27-Mar-25

9:43:31 AM

24

1344.50

XCSE

GENMAB A/S

27-Mar-25

9:43:32 AM

70

1344.00

TQEX

GENMAB A/S

27-Mar-25

9:43:36 AM

70

1343.50

XCSE

GENMAB A/S

27-Mar-25

9:43:36 AM

64

1343.50

CEUX

GENMAB A/S

27-Mar-25

9:43:36 AM

65

1343.50

AQEU

GENMAB A/S

27-Mar-25

9:44:02 AM

3

1344.50

XCSE

GENMAB A/S

27-Mar-25

9:44:02 AM

18

1344.50

XCSE

GENMAB A/S

27-Mar-25

9:44:02 AM

11

1344.50

XCSE

GENMAB A/S

27-Mar-25

9:44:02 AM

23

1344.50

CEUX

GENMAB A/S

27-Mar-25

9:44:02 AM

22

1344.50

TQEX

GENMAB A/S

27-Mar-25

9:44:02 AM

24

1344.50

AQEU

GENMAB A/S

27-Mar-25

9:44:39 AM

8

1343.50

XCSE

GENMAB A/S

27-Mar-25

9:45:08 AM

16

1343.50

XCSE

GENMAB A/S

27-Mar-25

9:45:08 AM

51

1343.50

CEUX

GENMAB A/S

27-Mar-25

9:45:08 AM

14

1343.50

TQEX

GENMAB A/S

27-Mar-25

9:45:08 AM

45

1343.50

AQEU

GENMAB A/S

27-Mar-25

9:45:32 AM

31

1342.50

XCSE

GENMAB A/S

27-Mar-25

9:45:32 AM

75

1342.50

AQEU

GENMAB A/S

27-Mar-25

9:45:51 AM

28

1342.00

CEUX

GENMAB A/S

27-Mar-25

9:45:51 AM

44

1342.00

CEUX

GENMAB A/S

27-Mar-25

9:48:05 AM

2

1342.00

CEUX

GENMAB A/S

27-Mar-25

9:49:12 AM

12

1343.00

CEUX

GENMAB A/S

27-Mar-25

9:49:20 AM

46

1343.00

CEUX

GENMAB A/S

27-Mar-25

9:51:12 AM

57

1343.50

XCSE

GENMAB A/S

27-Mar-25

9:51:12 AM

20

1343.50

XCSE

GENMAB A/S

27-Mar-25

9:52:29 AM

75

1343.50

XCSE

GENMAB A/S

27-Mar-25

9:52:29 AM

35

1343.50

TQEX

68


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

9:53:16 AM

74

1343.50

XCSE

GENMAB A/S

27-Mar-25

9:53:16 AM

11

1343.00

CEUX

GENMAB A/S

27-Mar-25

9:53:16 AM

18

1343.00

CEUX

GENMAB A/S

27-Mar-25

9:54:42 AM

46

1343.00

CEUX

GENMAB A/S

27-Mar-25

9:55:22 AM

10

1343.00

CEUX

GENMAB A/S

27-Mar-25

9:59:07 AM

32

1345.50

CEUX

GENMAB A/S

27-Mar-25

9:59:56 AM

44

1345.00

CEUX

GENMAB A/S

27-Mar-25

9:59:56 AM

29

1345.00

CEUX

GENMAB A/S

27-Mar-25

10:01:04 AM

73

1344.50

XCSE

GENMAB A/S

27-Mar-25

10:01:04 AM

1

1344.00

CEUX

GENMAB A/S

27-Mar-25

10:04:06 AM

13

1344.50

CEUX

GENMAB A/S

27-Mar-25

10:05:26 AM

74

1344.00

CEUX

GENMAB A/S

27-Mar-25

10:06:35 AM

1

1345.50

CEUX

GENMAB A/S

27-Mar-25

10:07:01 AM

66

1345.50

XCSE

GENMAB A/S

27-Mar-25

10:07:01 AM

9

1345.50

XCSE

GENMAB A/S

27-Mar-25

10:09:29 AM

33

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:09:29 AM

2

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:09:29 AM

43

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:09:29 AM

9

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:09:29 AM

9

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:09:41 AM

17

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:09:41 AM

16

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:09:41 AM

57

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:09:41 AM

8

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:10:00 AM

26

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:10:00 AM

12

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:10:00 AM

6

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:10:01 AM

10

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:10:45 AM

72

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:10:45 AM

73

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:12:02 AM

15

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:12:02 AM

3

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:12:02 AM

75

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:12:03 AM

16

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:12:10 AM

10

1347.50

CEUX

GENMAB A/S

27-Mar-25

10:12:10 AM

4

1347.50

CEUX

GENMAB A/S

27-Mar-25

10:12:10 AM

9

1347.50

CEUX

GENMAB A/S

27-Mar-25

10:12:10 AM

10

1347.50

CEUX

GENMAB A/S

27-Mar-25

10:12:13 AM

15

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:14:00 AM

16

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:14:00 AM

15

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:14:00 AM

38

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:14:00 AM

4

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:14:00 AM

21

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:14:00 AM

36

1347.00

CEUX

69


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

10:15:01 AM

51

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:15:01 AM

36

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:15:01 AM

72

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:15:01 AM

11

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:15:01 AM

6

1346.00

CEUX

GENMAB A/S

27-Mar-25

10:15:01 AM

36

1346.50

CEUX

GENMAB A/S

27-Mar-25

10:15:01 AM

71

1346.00

CEUX

GENMAB A/S

27-Mar-25

10:15:02 AM

30

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:15:02 AM

11

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:15:02 AM

49

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:15:02 AM

8

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:15:04 AM

15

1346.00

XCSE

GENMAB A/S

27-Mar-25

10:15:04 AM

7

1346.00

XCSE

GENMAB A/S

27-Mar-25

10:15:10 AM

19

1345.50

XCSE

GENMAB A/S

27-Mar-25

10:15:10 AM

59

1345.50

XCSE

GENMAB A/S

27-Mar-25

10:15:10 AM

20

1345.50

CEUX

GENMAB A/S

27-Mar-25

10:15:19 AM

36

1345.50

CEUX

GENMAB A/S

27-Mar-25

10:17:03 AM

7

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:20:08 AM

15

1347.00

TQEX

GENMAB A/S

27-Mar-25

10:20:28 AM

7

1347.00

TQEX

GENMAB A/S

27-Mar-25

10:21:45 AM

11

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:21:45 AM

5

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:21:45 AM

9

1347.00

XCSE

GENMAB A/S

27-Mar-25

10:21:45 AM

36

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:21:45 AM

5

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:21:46 AM

13

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:21:46 AM

30

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:21:46 AM

20

1347.00

CEUX

GENMAB A/S

27-Mar-25

10:22:53 AM

73

1346.50

XCSE

GENMAB A/S

27-Mar-25

10:22:53 AM

6

1346.50

CEUX

GENMAB A/S

27-Mar-25

10:24:43 AM

5

1347.50

CEUX

GENMAB A/S

27-Mar-25

10:24:43 AM

5

1347.50

CEUX

GENMAB A/S

27-Mar-25

10:24:43 AM

18

1347.50

CEUX

GENMAB A/S

27-Mar-25

10:24:43 AM

5

1347.50

CEUX

GENMAB A/S

27-Mar-25

10:25:04 AM

11

1347.50

CEUX

GENMAB A/S

27-Mar-25

10:27:16 AM

19

1349.50

XCSE

GENMAB A/S

27-Mar-25

10:27:16 AM

12

1349.50

XCSE

GENMAB A/S

27-Mar-25

10:27:16 AM

33

1349.50

XCSE

GENMAB A/S

27-Mar-25

10:27:16 AM

1

1349.50

CEUX

GENMAB A/S

27-Mar-25

10:27:16 AM

12

1349.50

CEUX

GENMAB A/S

27-Mar-25

10:29:47 AM

98

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:29:47 AM

46

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:29:47 AM

39

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:29:47 AM

13

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:29:47 AM

7

1350.00

CEUX

70


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

10:29:47 AM

12

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:30:18 AM

37

1349.50

XCSE

GENMAB A/S

27-Mar-25

10:30:18 AM

4

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:30:18 AM

43

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:30:18 AM

9

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:30:18 AM

43

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:30:18 AM

18

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:30:18 AM

36

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:31:53 AM

11

1351.00

XCSE

GENMAB A/S

27-Mar-25

10:31:53 AM

3

1351.00

XCSE

GENMAB A/S

27-Mar-25

10:31:53 AM

9

1351.00

XCSE

GENMAB A/S

27-Mar-25

10:32:03 AM

3

1351.00

XCSE

GENMAB A/S

27-Mar-25

10:32:24 AM

10

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:32:24 AM

4

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:32:24 AM

6

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:32:28 AM

26

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:32:28 AM

11

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:33:06 AM

34

1352.00

CEUX

GENMAB A/S

27-Mar-25

10:34:10 AM

3

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:34:10 AM

21

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:34:10 AM

3

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:34:11 AM

28

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:34:12 AM

77

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:34:12 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:34:12 AM

57

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:34:12 AM

10

1352.00

CEUX

GENMAB A/S

27-Mar-25

10:34:12 AM

42

1352.00

CEUX

GENMAB A/S

27-Mar-25

10:34:13 AM

22

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:34:13 AM

16

1352.00

CEUX

GENMAB A/S

27-Mar-25

10:34:21 AM

15

1352.00

CEUX

GENMAB A/S

27-Mar-25

10:35:03 AM

11

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:35:07 AM

28

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:35:24 AM

16

1352.00

CEUX

GENMAB A/S

27-Mar-25

10:35:26 AM

36

1351.50

TQEX

GENMAB A/S

27-Mar-25

10:35:27 AM

64

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:35:27 AM

10

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:38:23 AM

72

1350.50

XCSE

GENMAB A/S

27-Mar-25

10:38:23 AM

72

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:38:23 AM

31

1350.50

CEUX

GENMAB A/S

27-Mar-25

10:38:23 AM

1

1350.50

CEUX

GENMAB A/S

27-Mar-25

10:38:23 AM

36

1350.50

CEUX

GENMAB A/S

27-Mar-25

10:38:23 AM

37

1350.50

TQEX

GENMAB A/S

27-Mar-25

10:38:25 AM

54

1349.50

XCSE

GENMAB A/S

27-Mar-25

10:38:25 AM

19

1349.50

XCSE

GENMAB A/S

27-Mar-25

10:38:25 AM

25

1350.00

XCSE

71


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

10:38:25 AM

4

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:38:25 AM

5

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:38:25 AM

12

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:38:25 AM

4

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:38:25 AM

23

1349.50

TQEX

GENMAB A/S

27-Mar-25

10:38:52 AM

10

1349.50

XCSE

GENMAB A/S

27-Mar-25

10:41:39 AM

29

1350.00

TQEX

GENMAB A/S

27-Mar-25

10:42:14 AM

75

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:42:14 AM

28

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:42:14 AM

46

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:42:14 AM

25

1350.00

AQEU

GENMAB A/S

27-Mar-25

10:42:16 AM

10

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:42:16 AM

15

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:42:16 AM

13

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:42:16 AM

19

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:42:18 AM

1

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:42:24 AM

12

1350.00

CEUX

GENMAB A/S

27-Mar-25

10:45:19 AM

8

1351.00

XCSE

GENMAB A/S

27-Mar-25

10:45:59 AM

66

1351.00

XCSE

GENMAB A/S

27-Mar-25

10:45:59 AM

13

1351.00

XCSE

GENMAB A/S

27-Mar-25

10:45:59 AM

48

1351.00

XCSE

GENMAB A/S

27-Mar-25

10:45:59 AM

4

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:45:59 AM

72

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:45:59 AM

5

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:45:59 AM

30

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:45:59 AM

5

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:45:59 AM

34

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:45:59 AM

39

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:45:59 AM

31

1351.00

TQEX

GENMAB A/S

27-Mar-25

10:45:59 AM

22

1351.00

AQEU

GENMAB A/S

27-Mar-25

10:46:00 AM

36

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:00 AM

5

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:00 AM

4

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:00 AM

4

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:01 AM

31

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:01 AM

31

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:06 AM

22

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:07 AM

12

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:07 AM

5

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:07 AM

4

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:07 AM

5

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:07 AM

14

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:07 AM

17

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:07 AM

2

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:09 AM

3

1351.00

CEUX

72


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

10:46:14 AM

13

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:46:42 AM

9

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:46:42 AM

9

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:46:42 AM

10

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:46:42 AM

5

1352.00

CEUX

GENMAB A/S

27-Mar-25

10:46:42 AM

4

1352.00

CEUX

GENMAB A/S

27-Mar-25

10:46:42 AM

4

1352.00

CEUX

GENMAB A/S

27-Mar-25

10:49:33 AM

50

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:50:21 AM

30

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:50:21 AM

19

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:50:21 AM

13

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:51:40 AM

18

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:51:40 AM

2

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:51:41 AM

25

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:51:43 AM

15

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:51:44 AM

22

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:51:45 AM

4

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:51:48 AM

14

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:55:17 AM

76

1351.00

XCSE

GENMAB A/S

27-Mar-25

10:55:17 AM

77

1350.00

XCSE

GENMAB A/S

27-Mar-25

10:55:17 AM

77

1351.00

CEUX

GENMAB A/S

27-Mar-25

10:55:17 AM

30

1350.00

TQEX

GENMAB A/S

27-Mar-25

10:55:17 AM

23

1351.00

TQEX

GENMAB A/S

27-Mar-25

10:55:40 AM

50

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:55:40 AM

5

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:55:40 AM

73

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:55:40 AM

18

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:55:40 AM

25

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:55:40 AM

19

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:56:11 AM

22

1352.00

AQEU

GENMAB A/S

27-Mar-25

10:56:12 AM

9

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:12 AM

9

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:12 AM

10

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:12 AM

20

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:12 AM

50

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:12 AM

20

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:12 AM

9

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:12 AM

10

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:12 AM

9

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:26 AM

78

1351.50

XCSE

GENMAB A/S

27-Mar-25

10:56:26 AM

8

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:26 AM

43

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:26 AM

26

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:26 AM

5

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:26 AM

8

1352.00

XCSE

73


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

10:56:26 AM

8

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:26 AM

15

1351.50

CEUX

GENMAB A/S

27-Mar-25

10:56:27 AM

10

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:27 AM

9

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:56:27 AM

9

1352.00

XCSE

GENMAB A/S

27-Mar-25

10:58:00 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:00 AM

3

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:00 AM

30

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:00 AM

6

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:00 AM

2

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:00 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:00 AM

11

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:00 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:00 AM

3

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:01 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:01 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:01 AM

43

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:01 AM

2

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:01 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:01 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:01 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:01 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:02 AM

43

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:02 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:02 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

10:58:04 AM

14

1352.50

CEUX

GENMAB A/S

27-Mar-25

10:58:04 AM

5

1352.50

CEUX

GENMAB A/S

27-Mar-25

10:58:04 AM

10

1352.50

CEUX

GENMAB A/S

27-Mar-25

10:59:52 AM

15

1352.50

CEUX

GENMAB A/S

27-Mar-25

10:59:53 AM

14

1352.50

CEUX

GENMAB A/S

27-Mar-25

10:59:55 AM

2

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:00:13 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:00:13 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:00:13 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:00:21 AM

10

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:01:06 AM

11

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:01:51 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:01:51 AM

11

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:01:57 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:14 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:14 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:14 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:14 AM

5

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:02:15 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:15 AM

10

1352.50

XCSE

74


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:02:15 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:36 AM

11

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:02:50 AM

45

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:50 AM

5

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:02:51 AM

45

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:51 AM

45

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:51 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:02:51 AM

5

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:02:51 AM

4

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:02:51 AM

4

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:02:51 AM

5

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:02:51 AM

4

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:02:56 AM

54

1352.00

XCSE

GENMAB A/S

27-Mar-25

11:02:56 AM

44

1352.00

XCSE

GENMAB A/S

27-Mar-25

11:02:56 AM

7

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:02:56 AM

73

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:02:56 AM

29

1352.00

TQEX

GENMAB A/S

27-Mar-25

11:03:27 AM

39

1352.00

XCSE

GENMAB A/S

27-Mar-25

11:04:38 AM

2

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:38 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:38 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:38 AM

29

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:38 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:38 AM

2

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:38 AM

36

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:39 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:39 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:39 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:39 AM

3

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:40 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:40 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:40 AM

8

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:43 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:44 AM

4

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:44 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:44 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:46 AM

9

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:46 AM

10

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:04:46 AM

3

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:05:42 AM

30

1352.00

TQEX

GENMAB A/S

27-Mar-25

11:05:45 AM

41

1352.00

XCSE

GENMAB A/S

27-Mar-25

11:05:45 AM

17

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:05:45 AM

23

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:05:45 AM

26

1352.00

AQEU

GENMAB A/S

27-Mar-25

11:07:10 AM

5

1352.00

CEUX

75


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:07:10 AM

72

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:07:10 AM

5

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:07:10 AM

4

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:07:10 AM

32

1352.00

TQEX

GENMAB A/S

27-Mar-25

11:07:11 AM

32

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:07:11 AM

29

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:07:11 AM

19

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:07:13 AM

36

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:07:13 AM

22

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:09:53 AM

24

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:09:53 AM

4

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:09:53 AM

11

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:09:53 AM

5

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:09:53 AM

11

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:09:53 AM

13

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:09:55 AM

30

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:09:55 AM

10

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:09:55 AM

9

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:09:55 AM

10

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:09:55 AM

8

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:09:55 AM

8

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

7

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

32

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

10

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

10

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

10

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

11

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

9

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

3

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

8

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

17

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

43

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

6

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:56 AM

30

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:09:58 AM

40

1353.00

XCSE

GENMAB A/S

27-Mar-25

11:09:58 AM

74

1352.50

XCSE

GENMAB A/S

27-Mar-25

11:09:58 AM

20

1352.50

CEUX

GENMAB A/S

27-Mar-25

11:09:58 AM

74

1353.00

CEUX

GENMAB A/S

27-Mar-25

11:09:58 AM

22

1353.00

TQEX

GENMAB A/S

27-Mar-25

11:10:14 AM

75

1351.50

XCSE

GENMAB A/S

27-Mar-25

11:10:14 AM

73

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:10:14 AM

78

1351.00

CEUX

GENMAB A/S

27-Mar-25

11:10:14 AM

24

1351.00

TQEX

GENMAB A/S

27-Mar-25

11:10:14 AM

26

1352.00

TQEX

GENMAB A/S

27-Mar-25

11:10:14 AM

24

1352.00

AQEU

76


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:10:42 AM

38

1350.50

XCSE

GENMAB A/S

27-Mar-25

11:10:42 AM

73

1350.50

XCSE

GENMAB A/S

27-Mar-25

11:12:17 AM

2

1352.00

AQEU

GENMAB A/S

27-Mar-25

11:13:07 AM

37

1351.50

XCSE

GENMAB A/S

27-Mar-25

11:13:16 AM

38

1351.50

XCSE

GENMAB A/S

27-Mar-25

11:13:16 AM

75

1351.50

CEUX

GENMAB A/S

27-Mar-25

11:13:16 AM

36

1352.00

CEUX

GENMAB A/S

27-Mar-25

11:13:16 AM

32

1352.00

AQEU

GENMAB A/S

27-Mar-25

11:13:34 AM

26

1351.00

TQEX

GENMAB A/S

27-Mar-25

11:13:35 AM

14

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:13:35 AM

33

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:13:35 AM

8

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:13:35 AM

43

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:13:35 AM

37

1350.50

CEUX

GENMAB A/S

27-Mar-25

11:13:35 AM

36

1350.50

CEUX

GENMAB A/S

27-Mar-25

11:15:11 AM

76

1350.50

XCSE

GENMAB A/S

27-Mar-25

11:15:11 AM

11

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:15:11 AM

57

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:15:11 AM

30

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:15:11 AM

1

1350.50

CEUX

GENMAB A/S

27-Mar-25

11:15:12 AM

10

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:15:12 AM

23

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:15:12 AM

8

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:15:12 AM

10

1351.00

XCSE

GENMAB A/S

27-Mar-25

11:15:19 AM

75

1350.50

XCSE

GENMAB A/S

27-Mar-25

11:15:26 AM

43

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:15:26 AM

77

1357.00

XCSE

GENMAB A/S

27-Mar-25

11:15:26 AM

23

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:15:26 AM

11

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:15:26 AM

76

1356.00

CEUX

GENMAB A/S

27-Mar-25

11:15:31 AM

43

1356.00

XCSE

GENMAB A/S

27-Mar-25

11:15:31 AM

22

1356.00

XCSE

GENMAB A/S

27-Mar-25

11:15:31 AM

33

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:15:31 AM

36

1356.50

CEUX

GENMAB A/S

27-Mar-25

11:15:41 AM

20

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:15:41 AM

74

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:15:41 AM

10

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:15:41 AM

22

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:15:41 AM

76

1355.50

TQEX

GENMAB A/S

27-Mar-25

11:15:41 AM

74

1355.50

AQEU

GENMAB A/S

27-Mar-25

11:16:06 AM

74

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:16:06 AM

12

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:16:06 AM

71

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:16:06 AM

36

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:16:06 AM

73

1355.00

CEUX

77


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:16:06 AM

68

1354.50

TQEX

GENMAB A/S

27-Mar-25

11:16:06 AM

71

1354.50

AQEU

GENMAB A/S

27-Mar-25

11:16:07 AM

36

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:16:48 AM

19

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:16:48 AM

28

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:16:48 AM

26

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:16:48 AM

2

1354.50

TQEX

GENMAB A/S

27-Mar-25

11:16:51 AM

16

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:16:51 AM

8

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:17:57 AM

27

1354.00

AQEU

GENMAB A/S

27-Mar-25

11:18:00 AM

30

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:18:00 AM

17

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:18:00 AM

36

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:18:00 AM

22

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:18:00 AM

18

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:18:00 AM

63

1354.00

TQEX

GENMAB A/S

27-Mar-25

11:18:00 AM

28

1354.00

AQEU

GENMAB A/S

27-Mar-25

11:18:00 AM

14

1354.00

AQEU

GENMAB A/S

27-Mar-25

11:18:02 AM

31

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:18:04 AM

36

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:18:10 AM

24

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:18:13 AM

58

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:18:13 AM

30

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:18:13 AM

17

1353.50

CEUX

GENMAB A/S

27-Mar-25

11:18:13 AM

60

1353.50

CEUX

GENMAB A/S

27-Mar-25

11:18:52 AM

41

1353.00

AQEU

GENMAB A/S

27-Mar-25

11:20:00 AM

11

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:00 AM

87

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:01 AM

11

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:01 AM

2

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:01 AM

1

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:01 AM

3

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:01 AM

1

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:09 AM

46

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:09 AM

23

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:09 AM

7

1353.50

CEUX

GENMAB A/S

27-Mar-25

11:20:09 AM

14

1353.50

CEUX

GENMAB A/S

27-Mar-25

11:20:09 AM

15

1353.50

CEUX

GENMAB A/S

27-Mar-25

11:20:14 AM

17

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:38 AM

3

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:38 AM

19

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:20:38 AM

3

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:21:42 AM

2

1353.50

XCSE

GENMAB A/S

27-Mar-25

11:22:12 AM

12

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:22:12 AM

12

1354.00

CEUX

78


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:22:12 AM

24

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:22:12 AM

9

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:24:07 AM

17

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:24:10 AM

18

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:24:11 AM

30

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:24:11 AM

30

1354.00

XCSE

GENMAB A/S

27-Mar-25

11:24:11 AM

40

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:24:11 AM

2

1354.00

CEUX

GENMAB A/S

27-Mar-25

11:25:16 AM

32

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:16 AM

15

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:16 AM

15

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:16 AM

5

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:16 AM

31

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

25

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

8

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

1

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

8

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

8

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

48

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

14

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

43

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

3

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:17 AM

3

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:25:28 AM

20

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:33 AM

25

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:33 AM

38

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:33 AM

30

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:34 AM

30

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:34 AM

10

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:34 AM

8

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:34 AM

10

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:34 AM

30

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:35 AM

30

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:35 AM

8

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:25:36 AM

4

1354.50

XCSE

GENMAB A/S

27-Mar-25

11:28:06 AM

6

1354.50

CEUX

GENMAB A/S

27-Mar-25

11:28:06 AM

25

1354.50

CEUX

GENMAB A/S

27-Mar-25

11:28:06 AM

10

1354.50

CEUX

GENMAB A/S

27-Mar-25

11:28:06 AM

9

1354.50

CEUX

GENMAB A/S

27-Mar-25

11:28:06 AM

19

1354.50

CEUX

GENMAB A/S

27-Mar-25

11:28:06 AM

8

1354.50

CEUX

GENMAB A/S

27-Mar-25

11:28:06 AM

10

1354.50

CEUX

GENMAB A/S

27-Mar-25

11:28:27 AM

4

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:28:27 AM

15

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:28:27 AM

22

1355.00

CEUX

79


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:28:27 AM

6

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:28:27 AM

8

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:28:28 AM

32

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:29:16 AM

74

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:29:16 AM

60

1355.00

TQEX

GENMAB A/S

27-Mar-25

11:29:16 AM

14

1355.00

AQEU

GENMAB A/S

27-Mar-25

11:29:17 AM

23

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:29:17 AM

44

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:29:17 AM

32

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:29:17 AM

35

1355.00

AQEU

GENMAB A/S

27-Mar-25

11:29:36 AM

22

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:29:36 AM

30

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:29:36 AM

21

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:29:36 AM

77

1354.50

CEUX

GENMAB A/S

27-Mar-25

11:33:32 AM

15

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:33:32 AM

4

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:33:32 AM

23

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:33:32 AM

9

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:33:32 AM

10

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:33:36 AM

14

1355.00

TQEX

GENMAB A/S

27-Mar-25

11:33:54 AM

23

1355.00

TQEX

GENMAB A/S

27-Mar-25

11:33:58 AM

17

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:33:58 AM

3

1355.00

TQEX

GENMAB A/S

27-Mar-25

11:35:53 AM

30

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:35:53 AM

74

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:35:53 AM

9

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:35:53 AM

6

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:35:53 AM

68

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:35:53 AM

4

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:35:53 AM

26

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:35:53 AM

24

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:35:53 AM

36

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:35:54 AM

23

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:36:13 AM

7

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:36:13 AM

47

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:36:13 AM

21

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:36:13 AM

75

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:36:13 AM

15

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:36:13 AM

24

1355.00

TQEX

GENMAB A/S

27-Mar-25

11:36:36 AM

3

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:36:44 AM

2

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:17 AM

30

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:17 AM

10

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:17 AM

9

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:17 AM

34

1355.50

XCSE

80


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:37:17 AM

30

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:17 AM

73

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:17 AM

8

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:17 AM

38

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:18 AM

10

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:30 AM

9

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:30 AM

9

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:30 AM

9

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:30 AM

3

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:30 AM

8

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:32 AM

8

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:32 AM

9

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:32 AM

10

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:33 AM

8

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:38 AM

19

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:39 AM

2

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:41 AM

10

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:41 AM

8

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:41 AM

9

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:43 AM

10

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:37:45 AM

46

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:39:58 AM

36

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:39:58 AM

25

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:40:00 AM

30

1355.00

AQEU

GENMAB A/S

27-Mar-25

11:40:28 AM

13

1355.00

AQEU

GENMAB A/S

27-Mar-25

11:43:11 AM

25

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:43:11 AM

44

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:43:11 AM

36

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:43:11 AM

11

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:43:11 AM

14

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:43:11 AM

30

1355.00

TQEX

GENMAB A/S

27-Mar-25

11:43:11 AM

4

1355.00

AQEU

GENMAB A/S

27-Mar-25

11:43:51 AM

30

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:43:51 AM

43

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:43:51 AM

39

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:43:51 AM

17

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:43:51 AM

22

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:43:51 AM

14

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:43:51 AM

24

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:43:52 AM

3

1355.00

CEUX

GENMAB A/S

27-Mar-25

11:44:02 AM

50

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:44:03 AM

27

1355.00

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

8

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

27

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

13

1355.50

XCSE

81


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:44:53 AM

27

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

9

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

27

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

19

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

4

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

10

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

10

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:53 AM

28

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:44:53 AM

21

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:44:53 AM

4

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:44:57 AM

2

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:57 AM

93

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:44:58 AM

2

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:45:06 AM

45

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:45:06 AM

3

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:45:06 AM

28

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:45:07 AM

20

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:45:07 AM

62

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:45:29 AM

1

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:45:29 AM

12

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:45:29 AM

5

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:45:59 AM

15

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:45:59 AM

36

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:45:59 AM

3

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:46:31 AM

17

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:46:31 AM

10

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:46:31 AM

23

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:46:37 AM

10

1356.00

XCSE

GENMAB A/S

27-Mar-25

11:46:37 AM

9

1356.00

XCSE

GENMAB A/S

27-Mar-25

11:46:38 AM

8

1356.00

XCSE

GENMAB A/S

27-Mar-25

11:47:07 AM

78

1356.00

XCSE

GENMAB A/S

27-Mar-25

11:48:09 AM

4

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:48:09 AM

43

1355.50

XCSE

GENMAB A/S

27-Mar-25

11:48:09 AM

36

1356.00

CEUX

GENMAB A/S

27-Mar-25

11:48:09 AM

5

1356.00

CEUX

GENMAB A/S

27-Mar-25

11:48:09 AM

77

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:48:09 AM

20

1355.50

CEUX

GENMAB A/S

27-Mar-25

11:48:09 AM

25

1355.00

TQEX

GENMAB A/S

27-Mar-25

11:49:37 AM

8

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:37 AM

43

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:37 AM

9

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:37 AM

9

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:37 AM

8

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:37 AM

9

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:37 AM

9

1356.50

XCSE

82


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:49:37 AM

43

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:37 AM

28

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:38 AM

10

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:38 AM

8

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:38 AM

8

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:38 AM

10

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:38 AM

8

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:38 AM

12

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:38 AM

10

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:38 AM

41

1356.00

AQEU

GENMAB A/S

27-Mar-25

11:49:40 AM

8

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:40 AM

9

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:40 AM

8

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:45 AM

9

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:45 AM

13

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:49:48 AM

10

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:50:43 AM

10

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:50:43 AM

1

1356.50

XCSE

GENMAB A/S

27-Mar-25

11:51:24 AM

96

1357.00

XCSE

GENMAB A/S

27-Mar-25

11:51:24 AM

2

1357.00

XCSE

GENMAB A/S

27-Mar-25

11:51:27 AM

3

1357.50

XCSE

GENMAB A/S

27-Mar-25

11:51:27 AM

18

1357.50

XCSE

GENMAB A/S

27-Mar-25

11:52:04 AM

7

1357.50

CEUX

GENMAB A/S

27-Mar-25

11:52:30 AM

2

1358.00

XCSE

GENMAB A/S

27-Mar-25

11:52:30 AM

50

1358.00

XCSE

GENMAB A/S

27-Mar-25

11:52:36 AM

2

1358.00

XCSE

GENMAB A/S

27-Mar-25

11:52:51 AM

3

1358.00

XCSE

GENMAB A/S

27-Mar-25

11:53:02 AM

3

1358.00

XCSE

GENMAB A/S

27-Mar-25

11:53:03 AM

13

1358.00

CEUX

GENMAB A/S

27-Mar-25

11:53:03 AM

15

1358.00

CEUX

GENMAB A/S

27-Mar-25

11:53:31 AM

3

1358.50

CEUX

GENMAB A/S

27-Mar-25

11:53:51 AM

12

1358.50

CEUX

GENMAB A/S

27-Mar-25

11:55:09 AM

73

1358.50

XCSE

GENMAB A/S

27-Mar-25

11:55:09 AM

32

1358.50

CEUX

GENMAB A/S

27-Mar-25

11:55:09 AM

43

1358.50

CEUX

GENMAB A/S

27-Mar-25

11:55:09 AM

34

1358.50

CEUX

GENMAB A/S

27-Mar-25

11:55:42 AM

9

1360.50

XCSE

GENMAB A/S

27-Mar-25

11:55:42 AM

8

1360.50

XCSE

GENMAB A/S

27-Mar-25

11:55:42 AM

10

1360.50

XCSE

GENMAB A/S

27-Mar-25

11:55:42 AM

72

1360.50

CEUX

GENMAB A/S

27-Mar-25

11:55:43 AM

75

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:43 AM

78

1360.00

TQEX

GENMAB A/S

27-Mar-25

11:55:43 AM

44

1360.00

AQEU

GENMAB A/S

27-Mar-25

11:55:45 AM

70

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:45 AM

15

1360.00

XCSE

83


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:55:45 AM

13

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

7

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

11

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

10

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

25

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

36

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

10

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:46 AM

11

1359.50

CEUX

GENMAB A/S

27-Mar-25

11:55:47 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:47 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:47 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:47 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:47 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:47 AM

10

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:48 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:48 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:48 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:48 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:48 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:48 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:48 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:48 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:48 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:51 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:58 AM

4

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:58 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:58 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:58 AM

43

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:58 AM

24

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:58 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:58 AM

66

1359.50

CEUX

GENMAB A/S

27-Mar-25

11:55:59 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:59 AM

10

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:59 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:59 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:59 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:55:59 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:56:00 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:56:00 AM

9

1360.00

XCSE

84


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:56:00 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:56:01 AM

10

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:56:01 AM

9

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:56:01 AM

8

1360.00

XCSE

GENMAB A/S

27-Mar-25

11:56:56 AM

29

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:56:56 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:56:56 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:56:56 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:56:56 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:57:11 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:57:44 AM

2

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:57:51 AM

3

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:06 AM

7

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:06 AM

2

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:06 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:06 AM

43

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:06 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:06 AM

45

1360.50

XCSE

GENMAB A/S

27-Mar-25

11:58:06 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:06 AM

34

1360.50

CEUX

GENMAB A/S

27-Mar-25

11:58:06 AM

43

1360.50

CEUX

GENMAB A/S

27-Mar-25

11:58:07 AM

30

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

39

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

43

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

30

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

31

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

29

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:07 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:08 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:08 AM

42

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:08 AM

30

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:08 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:08 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:08 AM

17

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:08 AM

30

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

8

1361.00

XCSE

85


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:58:09 AM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

14

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

43

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

27

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

16

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

43

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

43

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

26

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:09 AM

9

1360.50

CEUX

GENMAB A/S

27-Mar-25

11:58:09 AM

68

1360.50

CEUX

GENMAB A/S

27-Mar-25

11:58:09 AM

11

1360.00

AQEU

GENMAB A/S

27-Mar-25

11:58:10 AM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:10 AM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:10 AM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:10 AM

43

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:10 AM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:10 AM

26

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:10 AM

43

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:13 AM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:13 AM

23

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:18 AM

23

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:19 AM

2

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

10

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

10

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

2

1361.00

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

10

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

10

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

25

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:22 AM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:23 AM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:23 AM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:23 AM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:23 AM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:23 AM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:23 AM

14

1361.50

XCSE

86


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

11:58:23 AM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:23 AM

1

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:24 AM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:24 AM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:58:27 AM

71

1361.00

TQEX

GENMAB A/S

27-Mar-25

11:58:27 AM

54

1361.00

AQEU

GENMAB A/S

27-Mar-25

11:59:47 AM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

33

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

31

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

16

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

13

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

7

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:47 AM

10

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:48 AM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

11:59:48 AM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:00:13 PM

22

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:00:13 PM

43

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:00:24 PM

76

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:00:24 PM

24

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:00:24 PM

78

1361.50

CEUX

GENMAB A/S

27-Mar-25

12:00:43 PM

2

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:00:51 PM

3

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:17 PM

69

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:17 PM

31

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:18 PM

10

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:18 PM

39

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:18 PM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:18 PM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:18 PM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:18 PM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:19 PM

10

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:19 PM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:19 PM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:19 PM

10

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:20 PM

39

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:20 PM

39

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:20 PM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:20 PM

8

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:20 PM

9

1361.50

XCSE

GENMAB A/S

27-Mar-25

12:01:20 PM

9

1361.50

XCSE

87


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

12:01:20 PM

42

1361.00

AQEU

GENMAB A/S

27-Mar-25

12:01:28 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:01:28 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:01:36 PM

28

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:01:36 PM

5

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:02:06 PM

37

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:02:06 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:02:18 PM

54

1360.50

CEUX

GENMAB A/S

27-Mar-25

12:02:58 PM

78

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:02:58 PM

72

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:02:58 PM

60

1363.00

TQEX

GENMAB A/S

27-Mar-25

12:02:58 PM

39

1363.00

AQEU

GENMAB A/S

27-Mar-25

12:03:21 PM

75

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:03:21 PM

32

1363.50

CEUX

GENMAB A/S

27-Mar-25

12:03:23 PM

48

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:03:23 PM

33

1363.00

TQEX

GENMAB A/S

27-Mar-25

12:03:23 PM

18

1363.00

AQEU

GENMAB A/S

27-Mar-25

12:04:34 PM

10

1363.00

AQEU

GENMAB A/S

27-Mar-25

12:09:49 PM

62

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:09:50 PM

30

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:10:05 PM

14

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:10:20 PM

33

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:20 PM

34

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:20 PM

15

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:20 PM

13

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:20 PM

43

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:20 PM

16

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:20 PM

17

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:21 PM

9

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:21 PM

33

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:21 PM

98

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:21 PM

8

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:10:21 PM

8

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:11:06 PM

4

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:11:06 PM

12

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:11:06 PM

4

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:11:06 PM

8

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:11:06 PM

9

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:11:33 PM

74

1362.00

XCSE

GENMAB A/S

27-Mar-25

12:11:33 PM

72

1362.00

CEUX

GENMAB A/S

27-Mar-25

12:11:33 PM

58

1362.00

TQEX

GENMAB A/S

27-Mar-25

12:11:33 PM

12

1362.00

AQEU

GENMAB A/S

27-Mar-25

12:11:33 PM

3

1362.00

AQEU

GENMAB A/S

27-Mar-25

12:11:33 PM

21

1362.00

AQEU

GENMAB A/S

27-Mar-25

12:11:42 PM

47

1361.00

XCSE

88


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

12:11:42 PM

25

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:11:42 PM

22

1361.00

CEUX

GENMAB A/S

27-Mar-25

12:11:42 PM

30

1361.00

AQEU

GENMAB A/S

27-Mar-25

12:12:01 PM

33

1360.50

TQEX

GENMAB A/S

27-Mar-25

12:12:07 PM

27

1360.00

CEUX

GENMAB A/S

27-Mar-25

12:12:07 PM

15

1360.00

AQEU

GENMAB A/S

27-Mar-25

12:12:09 PM

9

1360.00

AQEU

GENMAB A/S

27-Mar-25

12:13:56 PM

4

1360.00

XCSE

GENMAB A/S

27-Mar-25

12:13:56 PM

23

1360.00

XCSE

GENMAB A/S

27-Mar-25

12:14:12 PM

74

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:14:12 PM

70

1359.50

CEUX

GENMAB A/S

27-Mar-25

12:14:12 PM

6

1359.50

CEUX

GENMAB A/S

27-Mar-25

12:14:12 PM

28

1359.50

TQEX

GENMAB A/S

27-Mar-25

12:15:40 PM

22

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:15:46 PM

9

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:15:46 PM

10

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:15:46 PM

9

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:16:45 PM

43

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:16:45 PM

6

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:17:40 PM

8

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:17:40 PM

2

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:17:46 PM

26

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:17:47 PM

3

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:18:08 PM

75

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:18:08 PM

8

1359.50

TQEX

GENMAB A/S

27-Mar-25

12:18:15 PM

76

1358.50

XCSE

GENMAB A/S

27-Mar-25

12:18:15 PM

72

1358.50

CEUX

GENMAB A/S

27-Mar-25

12:18:15 PM

24

1358.50

AQEU

GENMAB A/S

27-Mar-25

12:18:15 PM

3

1358.50

AQEU

GENMAB A/S

27-Mar-25

12:19:27 PM

50

1357.50

XCSE

GENMAB A/S

27-Mar-25

12:23:19 PM

9

1358.50

XCSE

GENMAB A/S

27-Mar-25

12:23:19 PM

43

1358.50

XCSE

GENMAB A/S

27-Mar-25

12:23:19 PM

15

1358.50

XCSE

GENMAB A/S

27-Mar-25

12:23:19 PM

2

1358.50

XCSE

GENMAB A/S

27-Mar-25

12:23:19 PM

10

1358.50

XCSE

GENMAB A/S

27-Mar-25

12:23:19 PM

13

1358.50

XCSE

GENMAB A/S

27-Mar-25

12:23:19 PM

7

1358.50

AQEU

GENMAB A/S

27-Mar-25

12:23:24 PM

75

1359.00

XCSE

GENMAB A/S

27-Mar-25

12:27:25 PM

43

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:27:25 PM

9

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:27:26 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:27:26 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:27:26 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:27:26 PM

1

1359.50

XCSE

GENMAB A/S

27-Mar-25

12:27:27 PM

72

1360.50

XCSE

89


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

12:27:27 PM

5

1361.00

CEUX

GENMAB A/S

27-Mar-25

12:27:27 PM

73

1360.50

CEUX

GENMAB A/S

27-Mar-25

12:27:27 PM

5

1361.00

CEUX

GENMAB A/S

27-Mar-25

12:27:27 PM

36

1361.00

CEUX

GENMAB A/S

27-Mar-25

12:27:27 PM

4

1361.00

CEUX

GENMAB A/S

27-Mar-25

12:27:27 PM

31

1360.50

TQEX

GENMAB A/S

27-Mar-25

12:30:24 PM

28

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:24 PM

12

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:24 PM

6

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:25 PM

43

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:25 PM

14

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:25 PM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:25 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:26 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:26 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:26 PM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:27 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:29 PM

2

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:29 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:29 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:31 PM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:32 PM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:32 PM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:32 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:32 PM

2

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:33 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:33 PM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:41 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:41 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:43 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:30:43 PM

9

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:31:17 PM

14

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:32:35 PM

43

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:32:35 PM

10

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:32:37 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:32:37 PM

13

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:32:41 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:32:42 PM

8

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:34:36 PM

20

1361.00

XCSE

GENMAB A/S

27-Mar-25

12:35:49 PM

76

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:35:49 PM

36

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:35:49 PM

72

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:35:49 PM

26

1363.00

TQEX

GENMAB A/S

27-Mar-25

12:35:49 PM

8

1363.00

TQEX

GENMAB A/S

27-Mar-25

12:35:49 PM

24

1363.00

AQEU

90


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

12:35:50 PM

41

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:35:50 PM

19

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:35:50 PM

38

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:35:50 PM

78

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:35:51 PM

23

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:35:51 PM

19

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:35:51 PM

43

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:35:51 PM

5

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:35:51 PM

12

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:35:51 PM

4

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:35:51 PM

5

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:35:51 PM

5

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:35:51 PM

36

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:35:51 PM

25

1362.50

TQEX

GENMAB A/S

27-Mar-25

12:35:53 PM

21

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:36:05 PM

13

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:36:16 PM

44

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:36:16 PM

8

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:36:19 PM

15

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:39:27 PM

76

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:39:27 PM

73

1363.00

CEUX

GENMAB A/S

27-Mar-25

12:41:48 PM

73

1362.00

XCSE

GENMAB A/S

27-Mar-25

12:41:48 PM

43

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:41:48 PM

77

1362.00

CEUX

GENMAB A/S

27-Mar-25

12:41:48 PM

40

1362.50

CEUX

GENMAB A/S

27-Mar-25

12:41:48 PM

23

1362.50

TQEX

GENMAB A/S

27-Mar-25

12:41:48 PM

22

1362.50

AQEU

GENMAB A/S

27-Mar-25

12:43:08 PM

28

1362.50

CEUX

GENMAB A/S

27-Mar-25

12:43:08 PM

10

1362.50

CEUX

GENMAB A/S

27-Mar-25

12:43:08 PM

13

1362.50

CEUX

GENMAB A/S

27-Mar-25

12:43:16 PM

10

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:43:16 PM

43

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:43:16 PM

77

1362.00

CEUX

GENMAB A/S

27-Mar-25

12:43:23 PM

72

1362.50

CEUX

GENMAB A/S

27-Mar-25

12:43:35 PM

78

1362.00

XCSE

GENMAB A/S

27-Mar-25

12:44:10 PM

24

1361.50

TQEX

GENMAB A/S

27-Mar-25

12:44:10 PM

22

1361.50

AQEU

GENMAB A/S

27-Mar-25

12:44:53 PM

8

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:44:53 PM

9

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:44:53 PM

20

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:44:53 PM

9

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:44:54 PM

14

1363.00

XCSE

GENMAB A/S

27-Mar-25

12:45:02 PM

24

1365.50

XCSE

GENMAB A/S

27-Mar-25

12:45:02 PM

8

1365.50

XCSE

GENMAB A/S

27-Mar-25

12:45:02 PM

43

1365.50

XCSE

91


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

12:45:02 PM

17

1365.50

XCSE

GENMAB A/S

27-Mar-25

12:45:02 PM

46

1365.00

CEUX

GENMAB A/S

27-Mar-25

12:45:02 PM

28

1365.00

CEUX

GENMAB A/S

27-Mar-25

12:45:02 PM

26

1365.50

AQEU

GENMAB A/S

27-Mar-25

12:45:03 PM

41

1365.50

XCSE

GENMAB A/S

27-Mar-25

12:45:15 PM

63

1365.50

XCSE

GENMAB A/S

27-Mar-25

12:45:15 PM

20

1365.50

XCSE

GENMAB A/S

27-Mar-25

12:45:15 PM

76

1365.00

XCSE

GENMAB A/S

27-Mar-25

12:45:15 PM

15

1365.50

XCSE

GENMAB A/S

27-Mar-25

12:45:15 PM

68

1365.50

CEUX

GENMAB A/S

27-Mar-25

12:45:15 PM

22

1365.50

TQEX

GENMAB A/S

27-Mar-25

12:45:15 PM

34

1365.50

AQEU

GENMAB A/S

27-Mar-25

12:47:02 PM

22

1364.50

TQEX

GENMAB A/S

27-Mar-25

12:47:06 PM

3

1364.50

XCSE

GENMAB A/S

27-Mar-25

12:48:18 PM

73

1366.00

XCSE

GENMAB A/S

27-Mar-25

12:48:18 PM

76

1366.00

CEUX

GENMAB A/S

27-Mar-25

12:48:18 PM

23

1366.00

AQEU

GENMAB A/S

27-Mar-25

12:48:22 PM

33

1366.00

XCSE

GENMAB A/S

27-Mar-25

12:50:00 PM

1

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:50:01 PM

21

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:50:13 PM

2

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:50:14 PM

2

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:50:17 PM

2

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:50:21 PM

9

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:50:21 PM

9

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:50:21 PM

4

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:50:27 PM

2

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:53:43 PM

15

1368.50

XCSE

GENMAB A/S

27-Mar-25

12:55:17 PM

15

1366.00

XCSE

GENMAB A/S

27-Mar-25

12:55:17 PM

27

1366.00

XCSE

GENMAB A/S

27-Mar-25

12:55:17 PM

77

1366.00

XCSE

GENMAB A/S

27-Mar-25

12:55:17 PM

41

1366.00

XCSE

GENMAB A/S

27-Mar-25

12:55:17 PM

75

1368.50

XCSE

GENMAB A/S

27-Mar-25

12:55:17 PM

10

1366.00

XCSE

GENMAB A/S

27-Mar-25

12:55:17 PM

73

1367.00

XCSE

GENMAB A/S

27-Mar-25

12:55:17 PM

98

1368.50

XCSE

GENMAB A/S

27-Mar-25

12:55:17 PM

46

1366.00

CEUX

GENMAB A/S

27-Mar-25

12:55:17 PM

76

1368.00

CEUX

GENMAB A/S

27-Mar-25

12:55:17 PM

78

1367.00

CEUX

GENMAB A/S

27-Mar-25

12:55:17 PM

1

1368.00

CEUX

GENMAB A/S

27-Mar-25

12:55:17 PM

29

1367.50

TQEX

GENMAB A/S

27-Mar-25

12:55:17 PM

22

1366.50

TQEX

GENMAB A/S

27-Mar-25

12:55:17 PM

23

1368.00

AQEU

GENMAB A/S

27-Mar-25

12:55:17 PM

22

1367.00

AQEU

GENMAB A/S

27-Mar-25

12:55:17 PM

23

1366.00

AQEU

92


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

12:55:18 PM

11

1365.50

AQEU

GENMAB A/S

27-Mar-25

12:55:21 PM

28

1365.50

AQEU

GENMAB A/S

27-Mar-25

12:55:33 PM

76

1364.50

XCSE

GENMAB A/S

27-Mar-25

12:55:33 PM

9

1364.50

CEUX

GENMAB A/S

27-Mar-25

12:55:33 PM

67

1364.50

CEUX

GENMAB A/S

27-Mar-25

12:55:43 PM

78

1363.50

CEUX

GENMAB A/S

27-Mar-25

12:55:44 PM

19

1363.50

XCSE

GENMAB A/S

27-Mar-25

12:55:44 PM

55

1363.50

XCSE

GENMAB A/S

27-Mar-25

12:55:44 PM

15

1364.00

AQEU

GENMAB A/S

27-Mar-25

12:55:44 PM

9

1364.00

AQEU

GENMAB A/S

27-Mar-25

12:55:51 PM

45

1362.50

CEUX

GENMAB A/S

27-Mar-25

12:55:53 PM

76

1362.50

XCSE

GENMAB A/S

27-Mar-25

12:57:14 PM

27

1363.00

TQEX

GENMAB A/S

27-Mar-25

12:59:36 PM

48

1363.50

XCSE

GENMAB A/S

27-Mar-25

12:59:36 PM

29

1363.50

XCSE

GENMAB A/S

27-Mar-25

1:00:00 PM

48

1363.50

CEUX

GENMAB A/S

27-Mar-25

1:00:26 PM

48

1364.00

XCSE

GENMAB A/S

27-Mar-25

1:00:26 PM

8

1364.00

XCSE

GENMAB A/S

27-Mar-25

1:00:26 PM

13

1364.00

XCSE

GENMAB A/S

27-Mar-25

1:00:51 PM

39

1363.50

CEUX

GENMAB A/S

27-Mar-25

1:04:20 PM

56

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:04:20 PM

17

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:04:20 PM

69

1367.50

CEUX

GENMAB A/S

27-Mar-25

1:04:20 PM

40

1367.50

AQEU

GENMAB A/S

27-Mar-25

1:04:21 PM

9

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:04:21 PM

12

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:04:21 PM

8

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:04:21 PM

24

1367.00

TQEX

GENMAB A/S

27-Mar-25

1:04:24 PM

62

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:04:24 PM

22

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:04:29 PM

36

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:04:56 PM

27

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:04:56 PM

5

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:04:56 PM

21

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:04:56 PM

25

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:04:56 PM

8

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:04:56 PM

9

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:06:18 PM

24

1367.00

TQEX

GENMAB A/S

27-Mar-25

1:06:29 PM

34

1367.00

AQEU

GENMAB A/S

27-Mar-25

1:08:07 PM

22

1367.00

TQEX

GENMAB A/S

27-Mar-25

1:08:42 PM

40

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:08:42 PM

18

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:08:42 PM

24

1367.00

AQEU

GENMAB A/S

27-Mar-25

1:08:43 PM

42

1367.00

XCSE

GENMAB A/S

27-Mar-25

1:08:56 PM

26

1367.00

XCSE

93


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

1:09:09 PM

10

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:09:09 PM

19

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:09:09 PM

7

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:09:09 PM

9

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:09:09 PM

37

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:09:09 PM

8

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:09:09 PM

8

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:09:17 PM

26

1366.50

XCSE

GENMAB A/S

27-Mar-25

1:09:17 PM

50

1366.50

XCSE

GENMAB A/S

27-Mar-25

1:09:18 PM

58

1366.50

CEUX

GENMAB A/S

27-Mar-25

1:09:43 PM

2

1365.50

XCSE

GENMAB A/S

27-Mar-25

1:09:43 PM

73

1365.50

XCSE

GENMAB A/S

27-Mar-25

1:09:48 PM

36

1365.00

CEUX

GENMAB A/S

27-Mar-25

1:11:31 PM

75

1367.00

CEUX

GENMAB A/S

27-Mar-25

1:12:13 PM

40

1367.50

TQEX

GENMAB A/S

27-Mar-25

1:12:18 PM

17

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:12:18 PM

8

1367.50

XCSE

GENMAB A/S

27-Mar-25

1:12:19 PM

25

1367.00

CEUX

GENMAB A/S

27-Mar-25

1:12:19 PM

3

1367.00

CEUX

GENMAB A/S

27-Mar-25

1:12:25 PM

1

1367.00

AQEU

GENMAB A/S

27-Mar-25

1:13:10 PM

34

1368.00

CEUX

GENMAB A/S

27-Mar-25

1:13:26 PM

16

1368.00

XCSE

GENMAB A/S

27-Mar-25

1:13:29 PM

6

1368.00

XCSE

GENMAB A/S

27-Mar-25

1:13:30 PM

26

1368.00

CEUX

GENMAB A/S

27-Mar-25

1:14:23 PM

27

1371.00

XCSE

GENMAB A/S

27-Mar-25

1:14:23 PM

2

1371.00

XCSE

GENMAB A/S

27-Mar-25

1:14:23 PM

35

1371.00

XCSE

GENMAB A/S

27-Mar-25

1:14:24 PM

8

1371.00

XCSE

GENMAB A/S

27-Mar-25

1:14:24 PM

8

1371.00

XCSE

GENMAB A/S

27-Mar-25

1:14:24 PM

11

1371.00

XCSE

GENMAB A/S

27-Mar-25

1:14:25 PM

74

1371.00

XCSE

GENMAB A/S

27-Mar-25

1:15:05 PM

74

1373.00

XCSE

GENMAB A/S

27-Mar-25

1:15:08 PM

74

1372.50

CEUX

GENMAB A/S

27-Mar-25

1:15:32 PM

77

1372.00

XCSE

GENMAB A/S

27-Mar-25

1:15:54 PM

72

1371.00

XCSE

GENMAB A/S

27-Mar-25

1:15:54 PM

56

1371.50

CEUX

GENMAB A/S

27-Mar-25

1:19:02 PM

14

1371.50

CEUX

GENMAB A/S

27-Mar-25

1:19:18 PM

14

1371.50

CEUX

GENMAB A/S

27-Mar-25

1:19:37 PM

6

1371.50

CEUX

GENMAB A/S

27-Mar-25

1:19:39 PM

10

1371.50

XCSE

GENMAB A/S

27-Mar-25

1:19:39 PM

33

1371.50

XCSE

GENMAB A/S

27-Mar-25

1:19:39 PM

10

1371.50

XCSE

GENMAB A/S

27-Mar-25

1:19:39 PM

10

1371.50

XCSE

GENMAB A/S

27-Mar-25

1:20:39 PM

14

1371.50

XCSE

GENMAB A/S

27-Mar-25

1:20:39 PM

11

1371.50

XCSE

94


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

1:20:39 PM

50

1371.50

XCSE

GENMAB A/S

27-Mar-25

1:20:39 PM

23

1371.50

TQEX

GENMAB A/S

27-Mar-25

1:21:15 PM

18

1372.50

CEUX

GENMAB A/S

27-Mar-25

1:21:15 PM

57

1372.50

CEUX

GENMAB A/S

27-Mar-25

1:23:06 PM

19

1373.50

XCSE

GENMAB A/S

27-Mar-25

1:23:06 PM

14

1373.50

XCSE

GENMAB A/S

27-Mar-25

1:23:10 PM

44

1373.50

XCSE

GENMAB A/S

27-Mar-25

1:23:10 PM

20

1373.50

XCSE

GENMAB A/S

27-Mar-25

1:23:10 PM

34

1373.50

XCSE

GENMAB A/S

27-Mar-25

1:23:10 PM

76

1373.00

XCSE

GENMAB A/S

27-Mar-25

1:23:10 PM

64

1373.00

CEUX

GENMAB A/S

27-Mar-25

1:23:10 PM

42

1373.00

TQEX

GENMAB A/S

27-Mar-25

1:24:27 PM

4

1372.00

XCSE

GENMAB A/S

27-Mar-25

1:24:35 PM

4

1372.00

XCSE

GENMAB A/S

27-Mar-25

1:25:35 PM

38

1372.00

XCSE

GENMAB A/S

27-Mar-25

1:25:35 PM

68

1372.00

XCSE

GENMAB A/S

27-Mar-25

1:25:35 PM

60

1372.00

XCSE

GENMAB A/S

27-Mar-25

1:26:00 PM

14

1371.50

CEUX

GENMAB A/S

27-Mar-25

1:26:56 PM

43

1373.00

XCSE

GENMAB A/S

27-Mar-25

1:26:56 PM

3

1373.00

XCSE

GENMAB A/S

27-Mar-25

1:26:56 PM

15

1373.00

XCSE

GENMAB A/S

27-Mar-25

1:26:56 PM

9

1373.00

XCSE

GENMAB A/S

27-Mar-25

1:26:56 PM

2

1373.00

XCSE

GENMAB A/S

27-Mar-25

1:26:56 PM

2

1372.50

XCSE

GENMAB A/S

27-Mar-25

1:26:56 PM

24

1373.00

XCSE

GENMAB A/S

27-Mar-25

1:28:09 PM

42

1375.50

CEUX

GENMAB A/S

27-Mar-25

1:28:09 PM

34

1375.50

CEUX

GENMAB A/S

27-Mar-25

1:28:09 PM

42

1375.50

TQEX

GENMAB A/S

27-Mar-25

1:29:38 PM

36

1375.00

XCSE

GENMAB A/S

27-Mar-25

1:29:38 PM

30

1375.00

XCSE

GENMAB A/S

27-Mar-25

1:29:38 PM

72

1375.00

XCSE

GENMAB A/S

27-Mar-25

1:29:38 PM

22

1375.00

AQEU

GENMAB A/S

27-Mar-25

1:30:31 PM

19

1375.50

XCSE

GENMAB A/S

27-Mar-25

1:30:31 PM

11

1375.50

XCSE

GENMAB A/S

27-Mar-25

1:30:31 PM

22

1375.50

XCSE

GENMAB A/S

27-Mar-25

1:30:31 PM

46

1375.50

XCSE

GENMAB A/S

27-Mar-25

1:33:07 PM

73

1376.00

XCSE

GENMAB A/S

27-Mar-25

1:33:07 PM

26

1376.00

AQEU

GENMAB A/S

27-Mar-25

1:34:14 PM

47

1376.50

XCSE

GENMAB A/S

27-Mar-25

1:34:14 PM

51

1376.50

XCSE

GENMAB A/S

27-Mar-25

1:34:15 PM

41

1376.50

XCSE

GENMAB A/S

27-Mar-25

1:37:15 PM

35

1376.50

XCSE

GENMAB A/S

27-Mar-25

1:37:15 PM

42

1376.50

XCSE

GENMAB A/S

27-Mar-25

1:37:15 PM

21

1376.50

XCSE

GENMAB A/S

27-Mar-25

1:37:15 PM

72

1376.50

CEUX

95


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

1:37:15 PM

32

1376.00

CEUX

GENMAB A/S

27-Mar-25

1:37:15 PM

31

1376.50

AQEU

GENMAB A/S

27-Mar-25

1:37:17 PM

9

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:37:17 PM

10

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:37:17 PM

8

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:37:17 PM

32

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:37:17 PM

18

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:37:17 PM

17

1377.00

XCSE

GENMAB A/S

27-Mar-25

1:37:37 PM

23

1378.00

CEUX

GENMAB A/S

27-Mar-25

1:41:27 PM

26

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:41:27 PM

8

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:41:27 PM

10

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:41:27 PM

11

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:41:27 PM

18

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:41:27 PM

14

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:41:27 PM

7

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:41:32 PM

31

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:41:32 PM

40

1378.00

TQEX

GENMAB A/S

27-Mar-25

1:41:42 PM

15

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

15

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

11

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

8

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

26

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

9

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

46

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

10

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

20

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

74

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:41:42 PM

4

1378.00

CEUX

GENMAB A/S

27-Mar-25

1:41:42 PM

72

1377.50

CEUX

GENMAB A/S

27-Mar-25

1:41:42 PM

3

1377.50

CEUX

GENMAB A/S

27-Mar-25

1:41:42 PM

23

1377.00

TQEX

GENMAB A/S

27-Mar-25

1:41:42 PM

22

1377.50

AQEU

GENMAB A/S

27-Mar-25

1:41:52 PM

8

1377.50

XCSE

GENMAB A/S

27-Mar-25

1:41:56 PM

5

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:41:57 PM

12

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:42:16 PM

45

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:42:16 PM

17

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:42:19 PM

20

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:42:19 PM

14

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:42:30 PM

3

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:44:24 PM

10

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:44:24 PM

8

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:44:24 PM

69

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:44:24 PM

9

1378.50

CEUX

96


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

1:44:24 PM

73

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:44:24 PM

22

1378.50

AQEU

GENMAB A/S

27-Mar-25

1:44:25 PM

29

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:44:25 PM

21

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:44:25 PM

9

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:44:25 PM

30

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:44:25 PM

9

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:45:06 PM

14

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:45:06 PM

43

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:45:06 PM

12

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:45:06 PM

10

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:49:06 PM

26

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:49:07 PM

43

1379.00

CEUX

GENMAB A/S

27-Mar-25

1:50:00 PM

12

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:00 PM

33

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:00 PM

9

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:00 PM

10

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:00 PM

9

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:00 PM

9

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:00 PM

1

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:00 PM

6

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:00 PM

8

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:00 PM

9

1379.50

XCSE

GENMAB A/S

27-Mar-25

1:50:02 PM

49

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:50:02 PM

76

1379.00

XCSE

GENMAB A/S

27-Mar-25

1:50:02 PM

1

1379.00

CEUX

GENMAB A/S

27-Mar-25

1:50:02 PM

30

1379.00

CEUX

GENMAB A/S

27-Mar-25

1:50:02 PM

40

1379.00

CEUX

GENMAB A/S

27-Mar-25

1:50:02 PM

34

1379.00

CEUX

GENMAB A/S

27-Mar-25

1:50:44 PM

12

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:50:44 PM

19

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:50:46 PM

18

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:50:46 PM

30

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:50:46 PM

15

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:50:46 PM

23

1378.50

TQEX

GENMAB A/S

27-Mar-25

1:50:46 PM

24

1378.50

AQEU

GENMAB A/S

27-Mar-25

1:50:47 PM

44

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:50:47 PM

8

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:50:49 PM

28

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:50:49 PM

44

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:51:01 PM

78

1379.50

CEUX

GENMAB A/S

27-Mar-25

1:51:01 PM

32

1379.50

TQEX

GENMAB A/S

27-Mar-25

1:51:01 PM

7

1379.50

AQEU

GENMAB A/S

27-Mar-25

1:51:01 PM

15

1379.50

AQEU

GENMAB A/S

27-Mar-25

1:51:34 PM

17

1378.50

XCSE

97


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

1:51:34 PM

44

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:51:34 PM

12

1378.50

XCSE

GENMAB A/S

27-Mar-25

1:51:34 PM

69

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:51:34 PM

8

1378.50

CEUX

GENMAB A/S

27-Mar-25

1:51:34 PM

22

1378.50

AQEU

GENMAB A/S

27-Mar-25

1:52:46 PM

22

1377.50

CEUX

GENMAB A/S

27-Mar-25

1:52:46 PM

54

1377.50

CEUX

GENMAB A/S

27-Mar-25

1:53:16 PM

8

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:53:16 PM

9

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:53:16 PM

14

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:53:16 PM

10

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:53:16 PM

13

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:54:06 PM

9

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:54:06 PM

32

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:54:06 PM

6

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:54:06 PM

9

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:54:06 PM

8

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:54:56 PM

9

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:54:56 PM

6

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:54:56 PM

10

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:54:56 PM

10

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:55:59 PM

78

1378.00

XCSE

GENMAB A/S

27-Mar-25

1:55:59 PM

73

1377.50

CEUX

GENMAB A/S

27-Mar-25

1:55:59 PM

25

1378.00

TQEX

GENMAB A/S

27-Mar-25

1:55:59 PM

22

1378.00

AQEU

GENMAB A/S

27-Mar-25

1:56:12 PM

72

1377.00

XCSE

GENMAB A/S

27-Mar-25

1:58:48 PM

43

1377.00

XCSE

GENMAB A/S

27-Mar-25

1:58:48 PM

55

1377.00

XCSE

GENMAB A/S

27-Mar-25

1:58:49 PM

48

1377.00

XCSE

GENMAB A/S

27-Mar-25

1:59:14 PM

28

1376.50

AQEU

GENMAB A/S

27-Mar-25

1:59:26 PM

41

1376.50

XCSE

GENMAB A/S

27-Mar-25

1:59:26 PM

32

1376.50

XCSE

GENMAB A/S

27-Mar-25

1:59:43 PM

72

1376.00

CEUX

GENMAB A/S

27-Mar-25

2:00:31 PM

27

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:00:31 PM

73

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:00:57 PM

74

1376.00

CEUX

GENMAB A/S

27-Mar-25

2:01:28 PM

10

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:01:28 PM

78

1376.50

CEUX

GENMAB A/S

27-Mar-25

2:01:28 PM

9

1376.50

TQEX

GENMAB A/S

27-Mar-25

2:01:28 PM

14

1376.50

TQEX

GENMAB A/S

27-Mar-25

2:01:38 PM

2

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:01:57 PM

39

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:04:58 PM

27

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:04:58 PM

23

1376.00

AQEU

GENMAB A/S

27-Mar-25

2:05:19 PM

39

1375.50

XCSE

98


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:05:19 PM

10

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:05:19 PM

73

1375.50

CEUX

GENMAB A/S

27-Mar-25

2:05:19 PM

22

1375.50

TQEX

GENMAB A/S

27-Mar-25

2:06:06 PM

10

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

9

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

9

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

7

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

8

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

10

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

20

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

9

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

10

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

13

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

11

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

10

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

10

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:06 PM

8

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:23 PM

8

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:23 PM

20

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:06:23 PM

3

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:07:25 PM

44

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:25 PM

8

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:25 PM

11

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:25 PM

9

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:25 PM

9

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:25 PM

30

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:25 PM

17

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:46 PM

7

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:46 PM

10

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:46 PM

10

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:07:46 PM

3

1375.00

XCSE

GENMAB A/S

27-Mar-25

2:08:12 PM

24

1374.50

XCSE

GENMAB A/S

27-Mar-25

2:08:12 PM

51

1374.50

XCSE

GENMAB A/S

27-Mar-25

2:08:12 PM

15

1374.50

AQEU

GENMAB A/S

27-Mar-25

2:09:39 PM

30

1374.50

XCSE

GENMAB A/S

27-Mar-25

2:09:39 PM

9

1374.50

XCSE

GENMAB A/S

27-Mar-25

2:09:39 PM

17

1374.50

XCSE

GENMAB A/S

27-Mar-25

2:09:39 PM

58

1374.50

CEUX

GENMAB A/S

27-Mar-25

2:09:39 PM

14

1374.50

CEUX

GENMAB A/S

27-Mar-25

2:09:39 PM

8

1374.50

AQEU

GENMAB A/S

27-Mar-25

2:09:41 PM

23

1374.00

TQEX

GENMAB A/S

27-Mar-25

2:11:06 PM

12

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:11:15 PM

61

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:11:38 PM

30

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:11:38 PM

43

1374.00

XCSE

99


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:11:38 PM

8

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:11:38 PM

17

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:11:38 PM

44

1374.00

CEUX

GENMAB A/S

27-Mar-25

2:11:38 PM

34

1374.00

CEUX

GENMAB A/S

27-Mar-25

2:11:38 PM

30

1373.50

TQEX

GENMAB A/S

27-Mar-25

2:11:38 PM

24

1373.50

AQEU

GENMAB A/S

27-Mar-25

2:12:16 PM

9

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:12:16 PM

12

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:12:16 PM

9

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:12:16 PM

10

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:12:16 PM

13

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:12:16 PM

10

1374.00

XCSE

GENMAB A/S

27-Mar-25

2:12:46 PM

24

1373.00

XCSE

GENMAB A/S

27-Mar-25

2:13:18 PM

49

1373.00

XCSE

GENMAB A/S

27-Mar-25

2:14:25 PM

41

1373.00

XCSE

GENMAB A/S

27-Mar-25

2:14:25 PM

10

1373.00

XCSE

GENMAB A/S

27-Mar-25

2:14:25 PM

8

1373.00

XCSE

GENMAB A/S

27-Mar-25

2:14:25 PM

10

1373.00

XCSE

GENMAB A/S

27-Mar-25

2:14:25 PM

49

1373.00

CEUX

GENMAB A/S

27-Mar-25

2:14:25 PM

32

1373.50

CEUX

GENMAB A/S

27-Mar-25

2:14:36 PM

7

1372.50

XCSE

GENMAB A/S

27-Mar-25

2:14:36 PM

7

1372.50

XCSE

GENMAB A/S

27-Mar-25

2:14:36 PM

12

1372.50

XCSE

GENMAB A/S

27-Mar-25

2:14:36 PM

4

1372.50

XCSE

GENMAB A/S

27-Mar-25

2:14:36 PM

10

1372.50

XCSE

GENMAB A/S

27-Mar-25

2:14:41 PM

19

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:14:41 PM

54

1375.50

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

13

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

3

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

43

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

7

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

9

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

15

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

2

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

8

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

12

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

6

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

4

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:10 PM

9

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:16 PM

13

1376.00

XCSE

GENMAB A/S

27-Mar-25

2:17:25 PM

22

1377.00

CEUX

GENMAB A/S

27-Mar-25

2:17:30 PM

12

1377.00

XCSE

GENMAB A/S

27-Mar-25

2:17:31 PM

73

1377.50

XCSE

GENMAB A/S

27-Mar-25

2:17:31 PM

5

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:18:09 PM

73

1377.00

CEUX

100


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:18:09 PM

22

1377.00

TQEX

GENMAB A/S

27-Mar-25

2:21:23 PM

72

1376.50

XCSE

GENMAB A/S

27-Mar-25

2:21:24 PM

5

1376.50

CEUX

GENMAB A/S

27-Mar-25

2:21:24 PM

36

1376.50

CEUX

GENMAB A/S

27-Mar-25

2:22:31 PM

5

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:31 PM

5

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:31 PM

5

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:31 PM

30

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:31 PM

9

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:31 PM

1

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:31 PM

5

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:32 PM

12

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:46 PM

62

1377.50

XCSE

GENMAB A/S

27-Mar-25

2:22:46 PM

31

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:49 PM

62

1377.50

XCSE

GENMAB A/S

27-Mar-25

2:22:49 PM

31

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:22:51 PM

15

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:23:12 PM

5

1377.00

CEUX

GENMAB A/S

27-Mar-25

2:23:29 PM

98

1377.00

XCSE

GENMAB A/S

27-Mar-25

2:23:29 PM

69

1377.00

CEUX

GENMAB A/S

27-Mar-25

2:23:29 PM

42

1377.00

TQEX

GENMAB A/S

27-Mar-25

2:23:29 PM

10

1376.50

AQEU

GENMAB A/S

27-Mar-25

2:23:30 PM

98

1377.00

XCSE

GENMAB A/S

27-Mar-25

2:24:48 PM

4

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:24:49 PM

73

1377.00

CEUX

GENMAB A/S

27-Mar-25

2:24:49 PM

25

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:24:49 PM

4

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:24:49 PM

5

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:24:49 PM

4

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:25:20 PM

10

1378.00

CEUX

GENMAB A/S

27-Mar-25

2:25:41 PM

10

1378.50

XCSE

GENMAB A/S

27-Mar-25

2:25:41 PM

8

1378.50

XCSE

GENMAB A/S

27-Mar-25

2:25:41 PM

7

1378.50

XCSE

GENMAB A/S

27-Mar-25

2:25:41 PM

12

1378.50

XCSE

GENMAB A/S

27-Mar-25

2:26:19 PM

23

1380.50

XCSE

GENMAB A/S

27-Mar-25

2:26:19 PM

62

1380.50

XCSE

GENMAB A/S

27-Mar-25

2:26:19 PM

32

1380.50

CEUX

GENMAB A/S

27-Mar-25

2:26:20 PM

44

1380.50

XCSE

GENMAB A/S

27-Mar-25

2:26:41 PM

12

1381.00

CEUX

GENMAB A/S

27-Mar-25

2:26:41 PM

7

1381.00

CEUX

GENMAB A/S

27-Mar-25

2:26:59 PM

15

1381.00

CEUX

GENMAB A/S

27-Mar-25

2:27:14 PM

10

1381.00

CEUX

GENMAB A/S

27-Mar-25

2:27:23 PM

30

1380.50

XCSE

GENMAB A/S

27-Mar-25

2:27:26 PM

10

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:26 PM

17

1381.50

XCSE

101


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:27:26 PM

17

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:26 PM

10

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:26 PM

1

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:26 PM

9

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:26 PM

42

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:26 PM

7

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:26 PM

4

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:26 PM

12

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:36 PM

17

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:36 PM

10

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:36 PM

10

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:36 PM

10

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:36 PM

7

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:37 PM

2

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:37 PM

12

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:27:42 PM

4

1381.50

CEUX

GENMAB A/S

27-Mar-25

2:27:50 PM

73

1381.00

CEUX

GENMAB A/S

27-Mar-25

2:28:20 PM

30

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:28:21 PM

10

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:28:21 PM

12

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:28:21 PM

9

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:28:21 PM

8

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:28:30 PM

8

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:28:30 PM

10

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:29:02 PM

98

1381.00

XCSE

GENMAB A/S

27-Mar-25

2:29:02 PM

74

1379.50

XCSE

GENMAB A/S

27-Mar-25

2:29:02 PM

76

1378.50

XCSE

GENMAB A/S

27-Mar-25

2:29:02 PM

76

1380.50

XCSE

GENMAB A/S

27-Mar-25

2:29:02 PM

77

1381.00

CEUX

GENMAB A/S

27-Mar-25

2:29:02 PM

34

1379.00

CEUX

GENMAB A/S

27-Mar-25

2:29:02 PM

41

1379.00

CEUX

GENMAB A/S

27-Mar-25

2:29:02 PM

72

1380.00

CEUX

GENMAB A/S

27-Mar-25

2:29:02 PM

29

1379.50

TQEX

GENMAB A/S

27-Mar-25

2:29:02 PM

38

1380.50

TQEX

GENMAB A/S

27-Mar-25

2:29:02 PM

32

1378.50

TQEX

GENMAB A/S

27-Mar-25

2:29:02 PM

23

1378.50

AQEU

GENMAB A/S

27-Mar-25

2:29:03 PM

22

1377.50

XCSE

GENMAB A/S

27-Mar-25

2:29:03 PM

50

1377.50

XCSE

GENMAB A/S

27-Mar-25

2:29:03 PM

71

1377.50

CEUX

GENMAB A/S

27-Mar-25

2:29:36 PM

10

1379.00

XCSE

GENMAB A/S

27-Mar-25

2:29:36 PM

12

1379.00

XCSE

GENMAB A/S

27-Mar-25

2:29:36 PM

12

1379.00

XCSE

GENMAB A/S

27-Mar-25

2:29:46 PM

8

1379.00

XCSE

GENMAB A/S

27-Mar-25

2:29:46 PM

37

1379.00

XCSE

GENMAB A/S

27-Mar-25

2:29:46 PM

15

1379.00

XCSE

102


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:29:46 PM

11

1379.00

XCSE

GENMAB A/S

27-Mar-25

2:29:46 PM

8

1379.00

XCSE

GENMAB A/S

27-Mar-25

2:29:46 PM

8

1379.00

XCSE

GENMAB A/S

27-Mar-25

2:29:48 PM

5

1378.50

CEUX

GENMAB A/S

27-Mar-25

2:30:05 PM

28

1379.50

CEUX

GENMAB A/S

27-Mar-25

2:31:09 PM

1

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:31:09 PM

19

1382.50

CEUX

GENMAB A/S

27-Mar-25

2:31:09 PM

57

1382.50

CEUX

GENMAB A/S

27-Mar-25

2:31:09 PM

26

1382.50

TQEX

GENMAB A/S

27-Mar-25

2:31:15 PM

13

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:31:15 PM

10

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:31:15 PM

22

1381.50

TQEX

GENMAB A/S

27-Mar-25

2:31:21 PM

29

1381.50

XCSE

GENMAB A/S

27-Mar-25

2:31:35 PM

15

1382.50

XCSE

GENMAB A/S

27-Mar-25

2:31:35 PM

1

1382.50

XCSE

GENMAB A/S

27-Mar-25

2:31:35 PM

38

1382.50

XCSE

GENMAB A/S

27-Mar-25

2:31:35 PM

20

1382.50

XCSE

GENMAB A/S

27-Mar-25

2:31:45 PM

30

1382.50

CEUX

GENMAB A/S

27-Mar-25

2:31:48 PM

8

1383.00

XCSE

GENMAB A/S

27-Mar-25

2:31:48 PM

12

1383.00

XCSE

GENMAB A/S

27-Mar-25

2:31:48 PM

9

1383.00

XCSE

GENMAB A/S

27-Mar-25

2:31:50 PM

10

1383.00

XCSE

GENMAB A/S

27-Mar-25

2:31:51 PM

7

1383.00

XCSE

GENMAB A/S

27-Mar-25

2:31:54 PM

13

1383.00

XCSE

GENMAB A/S

27-Mar-25

2:32:01 PM

14

1383.00

XCSE

GENMAB A/S

27-Mar-25

2:32:52 PM

56

1384.50

CEUX

GENMAB A/S

27-Mar-25

2:32:52 PM

29

1385.00

TQEX

GENMAB A/S

27-Mar-25

2:32:53 PM

34

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:33:26 PM

73

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:33:26 PM

24

1386.00

TQEX

GENMAB A/S

27-Mar-25

2:34:21 PM

49

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:34:21 PM

2

1386.50

XCSE

GENMAB A/S

27-Mar-25

2:34:21 PM

11

1386.50

XCSE

GENMAB A/S

27-Mar-25

2:34:21 PM

24

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:34:21 PM

4

1386.50

XCSE

GENMAB A/S

27-Mar-25

2:34:21 PM

10

1386.50

XCSE

GENMAB A/S

27-Mar-25

2:34:21 PM

74

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:34:21 PM

23

1386.00

TQEX

GENMAB A/S

27-Mar-25

2:34:28 PM

12

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:34:28 PM

33

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:34:29 PM

42

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:34:44 PM

33

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:35:24 PM

31

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:35:24 PM

8

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:35:25 PM

8

1386.00

CEUX

103


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:35:27 PM

10

1385.00

XCSE

GENMAB A/S

27-Mar-25

2:35:27 PM

5

1385.00

XCSE

GENMAB A/S

27-Mar-25

2:35:27 PM

67

1385.00

XCSE

GENMAB A/S

27-Mar-25

2:35:27 PM

14

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:35:27 PM

39

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:35:27 PM

4

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:35:27 PM

31

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:35:27 PM

4

1385.50

CEUX

GENMAB A/S

27-Mar-25

2:35:27 PM

8

1385.00

TQEX

GENMAB A/S

27-Mar-25

2:35:27 PM

11

1385.00

TQEX

GENMAB A/S

27-Mar-25

2:35:27 PM

3

1385.00

TQEX

GENMAB A/S

27-Mar-25

2:35:27 PM

14

1385.50

AQEU

GENMAB A/S

27-Mar-25

2:35:27 PM

26

1385.50

AQEU

GENMAB A/S

27-Mar-25

2:35:57 PM

19

1384.50

CEUX

GENMAB A/S

27-Mar-25

2:35:57 PM

36

1384.50

CEUX

GENMAB A/S

27-Mar-25

2:36:05 PM

42

1384.50

XCSE

GENMAB A/S

27-Mar-25

2:36:05 PM

56

1384.50

XCSE

GENMAB A/S

27-Mar-25

2:36:07 PM

21

1384.50

XCSE

GENMAB A/S

27-Mar-25

2:36:38 PM

19

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:36:39 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:36:39 PM

17

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:36:39 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:36:39 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:36:52 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:36:52 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:36:52 PM

11

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:36:52 PM

36

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:36:52 PM

5

1387.00

CEUX

GENMAB A/S

27-Mar-25

2:36:52 PM

5

1387.00

CEUX

GENMAB A/S

27-Mar-25

2:36:52 PM

56

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:36:55 PM

20

1386.50

AQEU

GENMAB A/S

27-Mar-25

2:36:55 PM

2

1386.50

AQEU

GENMAB A/S

27-Mar-25

2:37:01 PM

74

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:37:01 PM

85

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:37:01 PM

24

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:37:01 PM

5

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:37:01 PM

73

1385.50

CEUX

GENMAB A/S

27-Mar-25

2:37:01 PM

12

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:37:01 PM

9

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:37:01 PM

25

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:37:01 PM

33

1385.50

TQEX

GENMAB A/S

27-Mar-25

2:37:30 PM

8

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:37:33 PM

28

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:37:33 PM

25

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:37:33 PM

40

1386.00

CEUX

104


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:38:01 PM

32

1385.50

TQEX

GENMAB A/S

27-Mar-25

2:38:12 PM

14

1387.00

CEUX

GENMAB A/S

27-Mar-25

2:39:14 PM

14

1388.00

XCSE

GENMAB A/S

27-Mar-25

2:39:14 PM

55

1388.00

XCSE

GENMAB A/S

27-Mar-25

2:39:14 PM

55

1388.00

XCSE

GENMAB A/S

27-Mar-25

2:39:14 PM

36

1388.00

XCSE

GENMAB A/S

27-Mar-25

2:39:14 PM

7

1388.00

XCSE

GENMAB A/S

27-Mar-25

2:39:14 PM

40

1388.00

XCSE

GENMAB A/S

27-Mar-25

2:39:14 PM

55

1388.00

XCSE

GENMAB A/S

27-Mar-25

2:39:14 PM

3

1388.00

XCSE

GENMAB A/S

27-Mar-25

2:39:14 PM

29

1388.00

XCSE

GENMAB A/S

27-Mar-25

2:39:20 PM

59

1387.00

CEUX

GENMAB A/S

27-Mar-25

2:39:21 PM

44

1387.50

XCSE

GENMAB A/S

27-Mar-25

2:39:49 PM

23

1387.00

TQEX

GENMAB A/S

27-Mar-25

2:39:49 PM

32

1387.00

AQEU

GENMAB A/S

27-Mar-25

2:40:01 PM

73

1386.50

XCSE

GENMAB A/S

27-Mar-25

2:40:01 PM

11

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:01 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:01 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:01 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:01 PM

49

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

30

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

20

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

11

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

26

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:02 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:03 PM

20

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:03 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:03 PM

11

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:03 PM

13

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:03 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:03 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:03 PM

49

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:03 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:04 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:04 PM

19

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:04 PM

49

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:05 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:05 PM

49

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:05 PM

10

1387.00

XCSE

105


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:40:05 PM

19

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:05 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:06 PM

49

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:06 PM

22

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:06 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:06 PM

19

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

49

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

19

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

49

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

19

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:07 PM

19

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:08 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:08 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:08 PM

49

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:08 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:08 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:08 PM

17

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:08 PM

19

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:10 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:10 PM

7

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:10 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:12 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:13 PM

6

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:13 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:13 PM

30

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:13 PM

43

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:13 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:13 PM

1

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:40:13 PM

10

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:40:13 PM

11

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:40:13 PM

16

1387.00

CEUX

GENMAB A/S

27-Mar-25

2:40:13 PM

74

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:40:13 PM

15

1387.00

CEUX

GENMAB A/S

27-Mar-25

2:40:13 PM

31

1386.00

TQEX

GENMAB A/S

27-Mar-25

2:40:14 PM

25

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:40:14 PM

40

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:41:05 PM

73

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:41:12 PM

15

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:41:12 PM

13

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:41:12 PM

19

1386.00

XCSE

106


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:41:12 PM

24

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:41:25 PM

28

1385.50

AQEU

GENMAB A/S

27-Mar-25

2:42:15 PM

19

1385.50

CEUX

GENMAB A/S

27-Mar-25

2:42:15 PM

23

1386.00

TQEX

GENMAB A/S

27-Mar-25

2:42:15 PM

13

1386.00

AQEU

GENMAB A/S

27-Mar-25

2:42:16 PM

9

1386.00

AQEU

GENMAB A/S

27-Mar-25

2:42:30 PM

68

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:42:30 PM

10

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:42:30 PM

72

1385.50

CEUX

GENMAB A/S

27-Mar-25

2:42:30 PM

36

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:35 PM

4

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:35 PM

11

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:35 PM

5

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:40 PM

8

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:43 PM

4

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:43 PM

22

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:43 PM

18

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:43 PM

5

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:43 PM

25

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:45 PM

10

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:52 PM

19

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:52 PM

22

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:52 PM

10

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:52 PM

11

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:52 PM

9

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:52 PM

15

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:42:52 PM

41

1386.00

TQEX

GENMAB A/S

27-Mar-25

2:42:59 PM

77

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:42:59 PM

41

1386.00

AQEU

GENMAB A/S

27-Mar-25

2:43:00 PM

13

1384.50

XCSE

GENMAB A/S

27-Mar-25

2:43:00 PM

11

1385.00

XCSE

GENMAB A/S

27-Mar-25

2:43:00 PM

32

1385.00

XCSE

GENMAB A/S

27-Mar-25

2:43:00 PM

24

1385.00

CEUX

GENMAB A/S

27-Mar-25

2:43:05 PM

1

1384.50

XCSE

GENMAB A/S

27-Mar-25

2:43:05 PM

23

1384.50

XCSE

GENMAB A/S

27-Mar-25

2:43:05 PM

42

1384.50

CEUX

GENMAB A/S

27-Mar-25

2:43:11 PM

10

1384.50

XCSE

GENMAB A/S

27-Mar-25

2:43:12 PM

29

1384.50

XCSE

GENMAB A/S

27-Mar-25

2:43:12 PM

30

1384.50

CEUX

GENMAB A/S

27-Mar-25

2:43:27 PM

1

1384.50

CEUX

GENMAB A/S

27-Mar-25

2:44:21 PM

10

1384.00

XCSE

GENMAB A/S

27-Mar-25

2:44:21 PM

30

1384.00

XCSE

GENMAB A/S

27-Mar-25

2:44:21 PM

15

1384.00

CEUX

GENMAB A/S

27-Mar-25

2:44:21 PM

22

1384.00

AQEU

GENMAB A/S

27-Mar-25

2:44:22 PM

20

1384.00

CEUX

107


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:44:22 PM

2

1384.00

CEUX

GENMAB A/S

27-Mar-25

2:44:26 PM

9

1383.50

XCSE

GENMAB A/S

27-Mar-25

2:44:26 PM

9

1383.50

XCSE

GENMAB A/S

27-Mar-25

2:44:26 PM

10

1383.50

XCSE

GENMAB A/S

27-Mar-25

2:44:26 PM

10

1383.50

XCSE

GENMAB A/S

27-Mar-25

2:45:11 PM

74

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:45:11 PM

15

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:45:11 PM

22

1386.00

TQEX

GENMAB A/S

27-Mar-25

2:45:11 PM

24

1386.00

AQEU

GENMAB A/S

27-Mar-25

2:45:20 PM

10

1385.50

XCSE

GENMAB A/S

27-Mar-25

2:45:21 PM

3

1385.50

CEUX

GENMAB A/S

27-Mar-25

2:45:23 PM

4

1385.50

CEUX

GENMAB A/S

27-Mar-25

2:45:33 PM

78

1386.00

CEUX

GENMAB A/S

27-Mar-25

2:45:43 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:43 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:43 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:43 PM

13

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:43 PM

20

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:43 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:43 PM

19

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:45:43 PM

58

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:45:45 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:45 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:45 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:45 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:45 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:45 PM

20

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:45 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:45 PM

20

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:46 PM

2

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:45:46 PM

1

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:45:47 PM

11

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:47 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:48 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:48 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:48 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:48 PM

19

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:48 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:51 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:51 PM

19

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:51 PM

1

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:45:52 PM

14

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:52 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:52 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:52 PM

10

1387.00

XCSE

108


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:45:52 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:52 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:52 PM

10

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:52 PM

9

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:53 PM

8

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:45:56 PM

7

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:46:01 PM

13

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:46:07 PM

75

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:46:07 PM

22

1387.00

TQEX

GENMAB A/S

27-Mar-25

2:46:07 PM

25

1387.00

AQEU

GENMAB A/S

27-Mar-25

2:46:15 PM

21

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:46:15 PM

20

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:46:15 PM

8

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:46:19 PM

14

1387.00

AQEU

GENMAB A/S

27-Mar-25

2:46:20 PM

74

1387.00

XCSE

GENMAB A/S

27-Mar-25

2:46:26 PM

20

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:46:26 PM

30

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:46:26 PM

10

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:46:26 PM

1

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:46:26 PM

14

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:46:26 PM

10

1387.00

AQEU

GENMAB A/S

27-Mar-25

2:46:30 PM

24

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:46:41 PM

4

1386.00

XCSE

GENMAB A/S

27-Mar-25

2:46:52 PM

74

1386.50

XCSE

GENMAB A/S

27-Mar-25

2:46:52 PM

74

1386.50

CEUX

GENMAB A/S

27-Mar-25

2:46:52 PM

28

1386.00

AQEU

GENMAB A/S

27-Mar-25

2:47:43 PM

74

1386.50

XCSE

GENMAB A/S

27-Mar-25

2:47:59 PM

19

1388.00

CEUX

GENMAB A/S

27-Mar-25

2:48:03 PM

17

1388.00

CEUX

GENMAB A/S

27-Mar-25

2:48:06 PM

12

1388.00

CEUX

GENMAB A/S

27-Mar-25

2:48:09 PM

2

1388.00

CEUX

GENMAB A/S

27-Mar-25

2:48:11 PM

1

1388.00

CEUX

GENMAB A/S

27-Mar-25

2:48:11 PM

1

1388.00

CEUX

GENMAB A/S

27-Mar-25

2:48:11 PM

1

1388.00

CEUX

GENMAB A/S

27-Mar-25

2:48:11 PM

1

1388.00

CEUX

GENMAB A/S

27-Mar-25

2:48:15 PM

22

1388.00

CEUX

GENMAB A/S

27-Mar-25

2:48:21 PM

15

1388.00

TQEX

GENMAB A/S

27-Mar-25

2:48:54 PM

72

1389.00

XCSE

GENMAB A/S

27-Mar-25

2:48:54 PM

9

1389.00

XCSE

GENMAB A/S

27-Mar-25

2:48:54 PM

14

1389.00

XCSE

GENMAB A/S

27-Mar-25

2:48:54 PM

3

1389.00

XCSE

GENMAB A/S

27-Mar-25

2:49:24 PM

9

1390.00

XCSE

GENMAB A/S

27-Mar-25

2:49:24 PM

20

1390.00

XCSE

GENMAB A/S

27-Mar-25

2:49:24 PM

10

1390.00

XCSE

GENMAB A/S

27-Mar-25

2:49:24 PM

8

1390.00

XCSE

109


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:49:25 PM

42

1390.00

XCSE

GENMAB A/S

27-Mar-25

2:49:41 PM

20

1389.50

XCSE

GENMAB A/S

27-Mar-25

2:49:41 PM

18

1389.50

CEUX

GENMAB A/S

27-Mar-25

2:49:41 PM

5

1389.50

CEUX

GENMAB A/S

27-Mar-25

2:49:41 PM

45

1389.50

CEUX

GENMAB A/S

27-Mar-25

2:49:41 PM

5

1389.50

CEUX

GENMAB A/S

27-Mar-25

2:49:41 PM

22

1389.50

TQEX

GENMAB A/S

27-Mar-25

2:49:41 PM

22

1389.50

AQEU

GENMAB A/S

27-Mar-25

2:50:27 PM

56

1390.50

XCSE

GENMAB A/S

27-Mar-25

2:50:27 PM

3

1390.50

XCSE

GENMAB A/S

27-Mar-25

2:50:30 PM

68

1391.00

XCSE

GENMAB A/S

27-Mar-25

2:50:32 PM

7

1391.00

XCSE

GENMAB A/S

27-Mar-25

2:50:32 PM

4

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:50:32 PM

1

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:50:32 PM

1

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:50:32 PM

12

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:50:32 PM

25

1391.00

TQEX

GENMAB A/S

27-Mar-25

2:50:46 PM

56

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:50:46 PM

19

1390.50

AQEU

GENMAB A/S

27-Mar-25

2:50:48 PM

60

1390.50

XCSE

GENMAB A/S

27-Mar-25

2:50:48 PM

3

1390.50

AQEU

GENMAB A/S

27-Mar-25

2:51:23 PM

31

1392.00

XCSE

GENMAB A/S

27-Mar-25

2:51:23 PM

46

1392.00

XCSE

GENMAB A/S

27-Mar-25

2:51:23 PM

10

1391.50

CEUX

GENMAB A/S

27-Mar-25

2:51:23 PM

10

1391.50

CEUX

GENMAB A/S

27-Mar-25

2:51:23 PM

2

1391.50

CEUX

GENMAB A/S

27-Mar-25

2:51:23 PM

8

1391.50

CEUX

GENMAB A/S

27-Mar-25

2:51:24 PM

53

1392.00

XCSE

GENMAB A/S

27-Mar-25

2:51:24 PM

27

1392.00

XCSE

GENMAB A/S

27-Mar-25

2:51:31 PM

6

1391.00

XCSE

GENMAB A/S

27-Mar-25

2:51:31 PM

44

1391.50

CEUX

GENMAB A/S

27-Mar-25

2:51:31 PM

26

1391.50

AQEU

GENMAB A/S

27-Mar-25

2:51:34 PM

2

1391.50

AQEU

GENMAB A/S

27-Mar-25

2:51:35 PM

52

1390.00

XCSE

GENMAB A/S

27-Mar-25

2:51:35 PM

21

1390.00

XCSE

GENMAB A/S

27-Mar-25

2:51:35 PM

71

1391.00

XCSE

GENMAB A/S

27-Mar-25

2:51:35 PM

41

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:51:35 PM

31

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:51:35 PM

4

1390.50

AQEU

GENMAB A/S

27-Mar-25

2:51:35 PM

18

1390.50

AQEU

GENMAB A/S

27-Mar-25

2:51:46 PM

10

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:51:59 PM

77

1390.00

XCSE

GENMAB A/S

27-Mar-25

2:51:59 PM

59

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:51:59 PM

6

1390.50

CEUX

GENMAB A/S

27-Mar-25

2:51:59 PM

6

1390.50

TQEX

110


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:51:59 PM

17

1390.50

TQEX

GENMAB A/S

27-Mar-25

2:51:59 PM

2

1390.00

AQEU

GENMAB A/S

27-Mar-25

2:51:59 PM

2

1390.00

AQEU

GENMAB A/S

27-Mar-25

2:52:29 PM

24

1390.00

AQEU

GENMAB A/S

27-Mar-25

2:52:54 PM

2

1392.00

CEUX

GENMAB A/S

27-Mar-25

2:52:54 PM

8

1392.00

CEUX

GENMAB A/S

27-Mar-25

2:53:26 PM

8

1394.00

XCSE

GENMAB A/S

27-Mar-25

2:53:31 PM

74

1393.50

XCSE

GENMAB A/S

27-Mar-25

2:53:50 PM

73

1392.50

XCSE

GENMAB A/S

27-Mar-25

2:53:50 PM

73

1393.00

CEUX

GENMAB A/S

27-Mar-25

2:53:50 PM

10

1392.00

CEUX

GENMAB A/S

27-Mar-25

2:53:50 PM

41

1393.00

TQEX

GENMAB A/S

27-Mar-25

2:54:16 PM

69

1393.00

XCSE

GENMAB A/S

27-Mar-25

2:54:16 PM

9

1393.00

XCSE

GENMAB A/S

27-Mar-25

2:54:16 PM

4

1393.00

CEUX

GENMAB A/S

27-Mar-25

2:54:16 PM

72

1393.00

CEUX

GENMAB A/S

27-Mar-25

2:54:16 PM

28

1393.00

AQEU

GENMAB A/S

27-Mar-25

2:54:20 PM

76

1393.00

XCSE

GENMAB A/S

27-Mar-25

2:54:27 PM

5

1392.00

CEUX

GENMAB A/S

27-Mar-25

2:54:31 PM

5

1392.00

CEUX

GENMAB A/S

27-Mar-25

2:54:31 PM

15

1392.00

CEUX

GENMAB A/S

27-Mar-25

2:55:28 PM

2

1392.50

XCSE

GENMAB A/S

27-Mar-25

2:55:28 PM

28

1392.50

XCSE

GENMAB A/S

27-Mar-25

2:55:30 PM

48

1392.50

XCSE

GENMAB A/S

27-Mar-25

2:56:07 PM

72

1392.50

XCSE

GENMAB A/S

27-Mar-25

2:56:38 PM

10

1394.00

CEUX

GENMAB A/S

27-Mar-25

2:56:38 PM

21

1394.00

CEUX

GENMAB A/S

27-Mar-25

2:56:51 PM

30

1394.00

XCSE

GENMAB A/S

27-Mar-25

2:56:51 PM

47

1394.00

XCSE

GENMAB A/S

27-Mar-25

2:56:51 PM

46

1394.00

CEUX

GENMAB A/S

27-Mar-25

2:57:09 PM

15

1394.00

XCSE

GENMAB A/S

27-Mar-25

2:57:09 PM

9

1394.00

XCSE

GENMAB A/S

27-Mar-25

2:57:24 PM

22

1393.50

TQEX

GENMAB A/S

27-Mar-25

2:57:29 PM

8

1394.50

XCSE

GENMAB A/S

27-Mar-25

2:57:29 PM

32

1394.50

XCSE

GENMAB A/S

27-Mar-25

2:57:29 PM

31

1394.50

XCSE

GENMAB A/S

27-Mar-25

2:57:29 PM

1

1394.50

XCSE

GENMAB A/S

27-Mar-25

2:57:29 PM

16

1394.50

XCSE

GENMAB A/S

27-Mar-25

2:57:29 PM

10

1394.50

XCSE

GENMAB A/S

27-Mar-25

2:58:45 PM

3

1396.00

CEUX

GENMAB A/S

27-Mar-25

2:58:55 PM

29

1397.00

XCSE

GENMAB A/S

27-Mar-25

2:58:55 PM

4

1397.00

XCSE

GENMAB A/S

27-Mar-25

2:58:55 PM

65

1397.00

XCSE

GENMAB A/S

27-Mar-25

2:58:55 PM

95

1397.00

XCSE

GENMAB A/S

27-Mar-25

2:59:28 PM

1

1396.00

CEUX

111


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

2:59:54 PM

12

1398.00

XCSE

GENMAB A/S

27-Mar-25

2:59:54 PM

49

1398.00

XCSE

GENMAB A/S

27-Mar-25

2:59:54 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

2:59:54 PM

27

1398.00

XCSE

GENMAB A/S

27-Mar-25

2:59:56 PM

52

1398.00

XCSE

GENMAB A/S

27-Mar-25

2:59:56 PM

8

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:00:01 PM

9

1398.50

CEUX

GENMAB A/S

27-Mar-25

3:00:09 PM

13

1399.00

CEUX

GENMAB A/S

27-Mar-25

3:00:10 PM

78

1398.50

XCSE

GENMAB A/S

27-Mar-25

3:00:10 PM

45

1398.50

CEUX

GENMAB A/S

27-Mar-25

3:00:10 PM

29

1398.50

CEUX

GENMAB A/S

27-Mar-25

3:00:10 PM

1

1399.00

CEUX

GENMAB A/S

27-Mar-25

3:00:10 PM

22

1398.50

TQEX

GENMAB A/S

27-Mar-25

3:01:01 PM

2

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:01:01 PM

21

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:01:01 PM

9

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:01:01 PM

10

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:01:01 PM

10

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:01:01 PM

5

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:01:01 PM

4

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:01:01 PM

2

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:01:01 PM

5

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:01:01 PM

23

1401.50

TQEX

GENMAB A/S

27-Mar-25

3:01:22 PM

76

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:01:22 PM

76

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:01:22 PM

19

1402.50

AQEU

GENMAB A/S

27-Mar-25

3:01:22 PM

3

1402.50

AQEU

GENMAB A/S

27-Mar-25

3:01:23 PM

28

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:01:23 PM

77

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:01:23 PM

48

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:01:23 PM

47

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:01:23 PM

28

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:01:23 PM

76

1400.00

CEUX

GENMAB A/S

27-Mar-25

3:01:23 PM

31

1401.50

AQEU

GENMAB A/S

27-Mar-25

3:01:23 PM

22

1400.00

AQEU

GENMAB A/S

27-Mar-25

3:02:03 PM

72

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:02:03 PM

22

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:02:03 PM

26

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:02:13 PM

75

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:02:13 PM

42

1402.50

TQEX

GENMAB A/S

27-Mar-25

3:02:35 PM

30

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:02:35 PM

22

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:03:07 PM

4

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:03:07 PM

9

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:03:15 PM

25

1402.50

XCSE

112


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:03:34 PM

34

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:03:34 PM

77

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:03:34 PM

23

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:03:43 PM

17

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:03:43 PM

40

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:04:28 PM

29

1403.00

AQEU

GENMAB A/S

27-Mar-25

3:04:51 PM

45

1403.50

XCSE

GENMAB A/S

27-Mar-25

3:04:51 PM

9

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:04:51 PM

10

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:04:52 PM

12

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:05:27 PM

54

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:05:27 PM

3

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:05:31 PM

63

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:06:45 PM

32

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:07:07 PM

19

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:07:07 PM

17

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:07:13 PM

50

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:07:15 PM

30

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:07:15 PM

25

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:07:15 PM

13

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:07:15 PM

26

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:07:15 PM

43

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:07:15 PM

16

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:07:15 PM

73

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:07:15 PM

76

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:07:15 PM

73

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:07:15 PM

9

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:07:15 PM

22

1403.00

TQEX

GENMAB A/S

27-Mar-25

3:07:15 PM

22

1402.00

TQEX

GENMAB A/S

27-Mar-25

3:07:15 PM

22

1403.00

AQEU

GENMAB A/S

27-Mar-25

3:07:15 PM

29

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:07:17 PM

40

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:07:18 PM

10

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:07:18 PM

14

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:07:21 PM

33

1401.00

AQEU

GENMAB A/S

27-Mar-25

3:07:27 PM

78

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:07:27 PM

34

1400.50

CEUX

GENMAB A/S

27-Mar-25

3:09:00 PM

40

1402.00

TQEX

GENMAB A/S

27-Mar-25

3:09:35 PM

4

1406.00

XCSE

GENMAB A/S

27-Mar-25

3:09:41 PM

55

1406.50

CEUX

GENMAB A/S

27-Mar-25

3:09:41 PM

17

1406.50

CEUX

GENMAB A/S

27-Mar-25

3:09:42 PM

9

1407.00

XCSE

GENMAB A/S

27-Mar-25

3:09:49 PM

73

1406.50

XCSE

GENMAB A/S

27-Mar-25

3:10:03 PM

11

1409.00

XCSE

GENMAB A/S

27-Mar-25

3:10:04 PM

73

1408.50

XCSE

113


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:10:04 PM

30

1409.00

XCSE

GENMAB A/S

27-Mar-25

3:10:04 PM

9

1409.00

XCSE

GENMAB A/S

27-Mar-25

3:10:04 PM

12

1409.00

XCSE

GENMAB A/S

27-Mar-25

3:10:04 PM

43

1409.00

XCSE

GENMAB A/S

27-Mar-25

3:10:04 PM

4

1409.00

XCSE

GENMAB A/S

27-Mar-25

3:10:04 PM

72

1408.50

CEUX

GENMAB A/S

27-Mar-25

3:10:04 PM

33

1409.00

AQEU

GENMAB A/S

27-Mar-25

3:10:06 PM

72

1408.00

XCSE

GENMAB A/S

27-Mar-25

3:10:06 PM

52

1408.50

CEUX

GENMAB A/S

27-Mar-25

3:10:06 PM

22

1408.50

AQEU

GENMAB A/S

27-Mar-25

3:10:35 PM

9

1407.00

XCSE

GENMAB A/S

27-Mar-25

3:10:35 PM

73

1408.00

XCSE

GENMAB A/S

27-Mar-25

3:10:35 PM

15

1407.00

XCSE

GENMAB A/S

27-Mar-25

3:10:35 PM

15

1407.00

XCSE

GENMAB A/S

27-Mar-25

3:10:35 PM

10

1407.00

XCSE

GENMAB A/S

27-Mar-25

3:10:35 PM

5

1407.00

XCSE

GENMAB A/S

27-Mar-25

3:10:35 PM

15

1407.00

XCSE

GENMAB A/S

27-Mar-25

3:10:35 PM

5

1407.00

XCSE

GENMAB A/S

27-Mar-25

3:10:35 PM

48

1407.00

CEUX

GENMAB A/S

27-Mar-25

3:10:35 PM

14

1408.00

CEUX

GENMAB A/S

27-Mar-25

3:10:35 PM

42

1409.00

CEUX

GENMAB A/S

27-Mar-25

3:10:35 PM

13

1408.00

CEUX

GENMAB A/S

27-Mar-25

3:10:35 PM

24

1407.50

AQEU

GENMAB A/S

27-Mar-25

3:10:35 PM

30

1408.50

AQEU

GENMAB A/S

27-Mar-25

3:11:10 PM

22

1408.50

CEUX

GENMAB A/S

27-Mar-25

3:11:22 PM

35

1407.50

XCSE

GENMAB A/S

27-Mar-25

3:11:22 PM

41

1407.50

XCSE

GENMAB A/S

27-Mar-25

3:11:22 PM

27

1407.50

CEUX

GENMAB A/S

27-Mar-25

3:11:22 PM

23

1407.50

AQEU

GENMAB A/S

27-Mar-25

3:12:00 PM

72

1407.00

XCSE

GENMAB A/S

27-Mar-25

3:12:00 PM

22

1407.00

CEUX

GENMAB A/S

27-Mar-25

3:12:00 PM

22

1407.00

TQEX

GENMAB A/S

27-Mar-25

3:12:00 PM

19

1407.00

AQEU

GENMAB A/S

27-Mar-25

3:12:03 PM

5

1407.00

AQEU

GENMAB A/S

27-Mar-25

3:12:06 PM

26

1406.00

XCSE

GENMAB A/S

27-Mar-25

3:12:06 PM

10

1406.00

XCSE

GENMAB A/S

27-Mar-25

3:12:06 PM

40

1406.00

XCSE

GENMAB A/S

27-Mar-25

3:12:11 PM

8

1406.00

AQEU

GENMAB A/S

27-Mar-25

3:12:13 PM

41

1405.50

CEUX

GENMAB A/S

27-Mar-25

3:12:13 PM

24

1406.00

AQEU

GENMAB A/S

27-Mar-25

3:12:43 PM

78

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:12:43 PM

22

1404.00

CEUX

GENMAB A/S

27-Mar-25

3:12:43 PM

24

1405.00

AQEU

GENMAB A/S

27-Mar-25

3:12:43 PM

24

1403.50

AQEU

GENMAB A/S

27-Mar-25

3:12:44 PM

24

1403.00

XCSE

114


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:12:44 PM

50

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:12:59 PM

53

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:12:59 PM

35

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:12:59 PM

17

1402.50

AQEU

GENMAB A/S

27-Mar-25

3:13:19 PM

43

1404.00

XCSE

GENMAB A/S

27-Mar-25

3:13:19 PM

22

1403.50

AQEU

GENMAB A/S

27-Mar-25

3:14:07 PM

18

1404.00

TQEX

GENMAB A/S

27-Mar-25

3:14:10 PM

62

1404.00

XCSE

GENMAB A/S

27-Mar-25

3:14:10 PM

24

1404.00

CEUX

GENMAB A/S

27-Mar-25

3:14:10 PM

16

1404.00

CEUX

GENMAB A/S

27-Mar-25

3:14:10 PM

3

1404.00

AQEU

GENMAB A/S

27-Mar-25

3:14:36 PM

10

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:14:36 PM

4

1404.00

AQEU

GENMAB A/S

27-Mar-25

3:14:36 PM

16

1404.00

AQEU

GENMAB A/S

27-Mar-25

3:14:40 PM

22

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:14:40 PM

30

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:14:48 PM

7

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:14:48 PM

24

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:15:03 PM

43

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:15:03 PM

22

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:15:32 PM

47

1400.50

XCSE

GENMAB A/S

27-Mar-25

3:15:32 PM

21

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:15:32 PM

36

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:15:32 PM

5

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:15:32 PM

20

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:15:32 PM

26

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:15:32 PM

6

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:15:32 PM

2

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:15:32 PM

23

1401.00

TQEX

GENMAB A/S

27-Mar-25

3:15:33 PM

36

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:15:33 PM

7

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:15:33 PM

19

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:15:48 PM

60

1398.50

XCSE

GENMAB A/S

27-Mar-25

3:15:51 PM

16

1399.00

CEUX

GENMAB A/S

27-Mar-25

3:15:51 PM

7

1399.00

CEUX

GENMAB A/S

27-Mar-25

3:15:55 PM

3

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:15:55 PM

21

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:15:55 PM

9

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:16:14 PM

29

1398.50

XCSE

GENMAB A/S

27-Mar-25

3:16:14 PM

29

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:17:09 PM

19

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:17:13 PM

25

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:17:13 PM

7

1396.00

XCSE

GENMAB A/S

27-Mar-25

3:17:13 PM

29

1396.50

CEUX

GENMAB A/S

27-Mar-25

3:17:13 PM

3

1398.00

CEUX

115


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:17:13 PM

25

1396.50

TQEX

GENMAB A/S

27-Mar-25

3:17:13 PM

23

1398.00

AQEU

GENMAB A/S

27-Mar-25

3:17:13 PM

22

1397.00

AQEU

GENMAB A/S

27-Mar-25

3:17:16 PM

60

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:18:13 PM

15

1397.50

CEUX

GENMAB A/S

27-Mar-25

3:18:34 PM

17

1397.50

CEUX

GENMAB A/S

27-Mar-25

3:19:56 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:19:56 PM

13

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:19:56 PM

41

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:20:34 PM

17

1396.00

XCSE

GENMAB A/S

27-Mar-25

3:20:34 PM

30

1396.50

CEUX

GENMAB A/S

27-Mar-25

3:20:34 PM

22

1396.50

TQEX

GENMAB A/S

27-Mar-25

3:21:09 PM

76

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:21:09 PM

39

1397.00

CEUX

GENMAB A/S

27-Mar-25

3:21:09 PM

22

1397.00

CEUX

GENMAB A/S

27-Mar-25

3:21:17 PM

16

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:21:17 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:21:17 PM

42

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:21:17 PM

42

1397.00

TQEX

GENMAB A/S

27-Mar-25

3:21:17 PM

22

1397.00

AQEU

GENMAB A/S

27-Mar-25

3:21:24 PM

10

1396.00

XCSE

GENMAB A/S

27-Mar-25

3:21:32 PM

10

1396.00

XCSE

GENMAB A/S

27-Mar-25

3:21:32 PM

10

1396.00

XCSE

GENMAB A/S

27-Mar-25

3:21:38 PM

4

1396.00

XCSE

GENMAB A/S

27-Mar-25

3:21:50 PM

39

1396.00

XCSE

GENMAB A/S

27-Mar-25

3:22:05 PM

55

1396.50

CEUX

GENMAB A/S

27-Mar-25

3:22:08 PM

29

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:22:19 PM

11

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:22:19 PM

11

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:22:20 PM

47

1397.00

CEUX

GENMAB A/S

27-Mar-25

3:22:28 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:22:36 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:22:37 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:22:37 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:22:46 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:22:52 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:22:58 PM

12

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:23:09 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:24:34 PM

41

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:24:34 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:24:34 PM

24

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:24:34 PM

73

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:25:24 PM

1

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:25:24 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:25:24 PM

2

1399.00

XCSE

116


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:25:24 PM

7

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:25:24 PM

14

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:25:58 PM

7

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:25:58 PM

31

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:25:58 PM

42

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:25:58 PM

18

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:26:01 PM

42

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:26:01 PM

12

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:26:01 PM

10

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:26:01 PM

8

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:26:01 PM

10

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:26:07 PM

11

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:26:07 PM

31

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:26:07 PM

18

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:26:07 PM

42

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:26:07 PM

76

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:26:07 PM

22

1403.00

TQEX

GENMAB A/S

27-Mar-25

3:26:07 PM

11

1403.00

AQEU

GENMAB A/S

27-Mar-25

3:26:07 PM

4

1403.00

AQEU

GENMAB A/S

27-Mar-25

3:26:07 PM

11

1403.00

AQEU

GENMAB A/S

27-Mar-25

3:26:20 PM

10

1403.50

XCSE

GENMAB A/S

27-Mar-25

3:26:20 PM

30

1403.50

XCSE

GENMAB A/S

27-Mar-25

3:26:20 PM

10

1403.50

XCSE

GENMAB A/S

27-Mar-25

3:26:20 PM

1

1403.50

CEUX

GENMAB A/S

27-Mar-25

3:26:20 PM

44

1403.50

CEUX

GENMAB A/S

27-Mar-25

3:26:20 PM

4

1403.50

CEUX

GENMAB A/S

27-Mar-25

3:26:20 PM

2

1403.50

CEUX

GENMAB A/S

27-Mar-25

3:26:20 PM

22

1403.50

TQEX

GENMAB A/S

27-Mar-25

3:26:32 PM

76

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:26:32 PM

67

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:26:32 PM

78

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:26:32 PM

32

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:26:32 PM

28

1403.00

AQEU

GENMAB A/S

27-Mar-25

3:27:09 PM

74

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:27:09 PM

23

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:27:09 PM

3

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:27:09 PM

21

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:27:55 PM

77

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:27:55 PM

28

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:27:55 PM

23

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:27:55 PM

2

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:27:58 PM

77

1400.50

XCSE

GENMAB A/S

27-Mar-25

3:28:19 PM

7

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:28:19 PM

69

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:28:56 PM

5

1402.00

CEUX

117


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:29:11 PM

9

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:29:11 PM

18

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:29:11 PM

5

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:29:11 PM

22

1402.00

TQEX

GENMAB A/S

27-Mar-25

3:29:11 PM

42

1402.00

AQEU

GENMAB A/S

27-Mar-25

3:29:15 PM

12

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:29:16 PM

20

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:29:16 PM

34

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:30:15 PM

73

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:30:15 PM

41

1402.00

TQEX

GENMAB A/S

27-Mar-25

3:31:07 PM

72

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:31:07 PM

60

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:31:10 PM

77

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:31:10 PM

5

1401.50

CEUX

GENMAB A/S

27-Mar-25

3:31:10 PM

18

1401.50

CEUX

GENMAB A/S

27-Mar-25

3:31:50 PM

16

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:32:46 PM

4

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:33:01 PM

10

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:33:01 PM

4

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:33:01 PM

9

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:33:07 PM

8

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:33:07 PM

24

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:33:07 PM

30

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:33:07 PM

77

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:33:07 PM

26

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:33:07 PM

74

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:33:07 PM

10

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:33:07 PM

48

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:33:07 PM

22

1401.00

AQEU

GENMAB A/S

27-Mar-25

3:33:07 PM

22

1402.50

AQEU

GENMAB A/S

27-Mar-25

3:33:30 PM

73

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:33:30 PM

10

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:33:30 PM

64

1402.00

XCSE

GENMAB A/S

27-Mar-25

3:33:30 PM

40

1402.50

CEUX

GENMAB A/S

27-Mar-25

3:34:17 PM

72

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:34:17 PM

48

1405.00

CEUX

GENMAB A/S

27-Mar-25

3:34:17 PM

22

1405.00

TQEX

GENMAB A/S

27-Mar-25

3:34:17 PM

22

1405.00

AQEU

GENMAB A/S

27-Mar-25

3:34:28 PM

45

1404.00

CEUX

GENMAB A/S

27-Mar-25

3:35:06 PM

17

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:35:06 PM

13

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:35:06 PM

5

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:35:06 PM

14

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:35:17 PM

77

1403.50

XCSE

GENMAB A/S

27-Mar-25

3:35:38 PM

19

1404.50

CEUX

118


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:35:38 PM

34

1404.50

CEUX

GENMAB A/S

27-Mar-25

3:36:01 PM

10

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:36:01 PM

10

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:36:01 PM

9

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:36:01 PM

8

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:36:40 PM

38

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:36:40 PM

60

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:36:45 PM

5

1404.00

AQEU

GENMAB A/S

27-Mar-25

3:36:56 PM

6

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:36:56 PM

32

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:37:16 PM

47

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:37:36 PM

41

1404.00

XCSE

GENMAB A/S

27-Mar-25

3:37:36 PM

11

1404.00

XCSE

GENMAB A/S

27-Mar-25

3:37:36 PM

43

1404.00

XCSE

GENMAB A/S

27-Mar-25

3:37:42 PM

50

1403.50

XCSE

GENMAB A/S

27-Mar-25

3:37:42 PM

74

1404.00

CEUX

GENMAB A/S

27-Mar-25

3:37:42 PM

30

1404.00

AQEU

GENMAB A/S

27-Mar-25

3:39:58 PM

42

1403.50

XCSE

GENMAB A/S

27-Mar-25

3:39:58 PM

23

1403.50

XCSE

GENMAB A/S

27-Mar-25

3:39:58 PM

22

1403.50

TQEX

GENMAB A/S

27-Mar-25

3:40:04 PM

46

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:40:07 PM

33

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:40:08 PM

42

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:40:08 PM

44

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:40:08 PM

12

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:40:12 PM

13

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:40:12 PM

11

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:40:13 PM

30

1402.50

AQEU

GENMAB A/S

27-Mar-25

3:40:19 PM

53

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:41:10 PM

38

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:41:10 PM

60

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:41:10 PM

29

1404.50

TQEX

GENMAB A/S

27-Mar-25

3:41:10 PM

8

1404.50

AQEU

GENMAB A/S

27-Mar-25

3:41:24 PM

73

1405.00

CEUX

GENMAB A/S

27-Mar-25

3:41:24 PM

24

1405.00

TQEX

GENMAB A/S

27-Mar-25

3:41:44 PM

30

1405.50

XCSE

GENMAB A/S

27-Mar-25

3:41:44 PM

9

1405.50

XCSE

GENMAB A/S

27-Mar-25

3:41:44 PM

22

1405.50

XCSE

GENMAB A/S

27-Mar-25

3:41:44 PM

37

1405.50

XCSE

GENMAB A/S

27-Mar-25

3:41:53 PM

14

1406.00

XCSE

GENMAB A/S

27-Mar-25

3:42:12 PM

40

1406.50

XCSE

GENMAB A/S

27-Mar-25

3:42:12 PM

4

1406.50

XCSE

GENMAB A/S

27-Mar-25

3:42:12 PM

40

1406.50

XCSE

GENMAB A/S

27-Mar-25

3:42:12 PM

19

1406.50

XCSE

GENMAB A/S

27-Mar-25

3:42:12 PM

33

1406.50

XCSE

119


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:42:12 PM

10

1406.50

XCSE

GENMAB A/S

27-Mar-25

3:42:12 PM

30

1406.50

CEUX

GENMAB A/S

27-Mar-25

3:42:12 PM

47

1406.50

CEUX

GENMAB A/S

27-Mar-25

3:42:12 PM

12

1406.50

TQEX

GENMAB A/S

27-Mar-25

3:42:12 PM

22

1406.50

TQEX

GENMAB A/S

27-Mar-25

3:42:28 PM

77

1405.50

XCSE

GENMAB A/S

27-Mar-25

3:42:28 PM

73

1404.50

XCSE

GENMAB A/S

27-Mar-25

3:42:28 PM

77

1405.50

CEUX

GENMAB A/S

27-Mar-25

3:42:28 PM

37

1405.00

AQEU

GENMAB A/S

27-Mar-25

3:42:40 PM

72

1404.00

CEUX

GENMAB A/S

27-Mar-25

3:42:41 PM

78

1403.00

XCSE

GENMAB A/S

27-Mar-25

3:42:41 PM

73

1403.00

CEUX

GENMAB A/S

27-Mar-25

3:42:42 PM

11

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:42:42 PM

12

1402.50

XCSE

GENMAB A/S

27-Mar-25

3:42:46 PM

49

1402.00

CEUX

GENMAB A/S

27-Mar-25

3:42:56 PM

72

1401.50

XCSE

GENMAB A/S

27-Mar-25

3:43:26 PM

62

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:43:26 PM

22

1400.50

CEUX

GENMAB A/S

27-Mar-25

3:44:03 PM

22

1399.00

CEUX

GENMAB A/S

27-Mar-25

3:44:53 PM

4

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:46:20 PM

13

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:46:20 PM

25

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:46:20 PM

1

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:46:20 PM

10

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:46:20 PM

9

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:46:46 PM

72

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:48:02 PM

11

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:48:02 PM

1

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:48:02 PM

7

1400.50

XCSE

GENMAB A/S

27-Mar-25

3:48:02 PM

30

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:48:02 PM

27

1400.00

TQEX

GENMAB A/S

27-Mar-25

3:48:02 PM

3

1400.00

AQEU

GENMAB A/S

27-Mar-25

3:48:02 PM

21

1400.00

AQEU

GENMAB A/S

27-Mar-25

3:48:03 PM

13

1400.50

XCSE

GENMAB A/S

27-Mar-25

3:48:21 PM

2

1400.50

AQEU

GENMAB A/S

27-Mar-25

3:48:21 PM

2

1400.50

AQEU

GENMAB A/S

27-Mar-25

3:48:21 PM

20

1400.50

AQEU

GENMAB A/S

27-Mar-25

3:48:21 PM

3

1400.50

AQEU

GENMAB A/S

27-Mar-25

3:48:48 PM

42

1400.50

XCSE

GENMAB A/S

27-Mar-25

3:48:48 PM

77

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:48:48 PM

9

1400.50

XCSE

GENMAB A/S

27-Mar-25

3:48:48 PM

20

1400.50

XCSE

GENMAB A/S

27-Mar-25

3:48:50 PM

1

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:48:50 PM

12

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:48:50 PM

9

1400.00

XCSE

120


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:48:50 PM

14

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:48:57 PM

9

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:49:06 PM

14

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:49:06 PM

61

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:49:06 PM

1

1401.00

CEUX

GENMAB A/S

27-Mar-25

3:49:07 PM

9

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:07 PM

21

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:09 PM

20

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:09 PM

26

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:09 PM

42

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:09 PM

10

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:10 PM

37

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:10 PM

10

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:10 PM

8

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:10 PM

42

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:10 PM

8

1401.00

XCSE

GENMAB A/S

27-Mar-25

3:49:17 PM

76

1400.50

CEUX

GENMAB A/S

27-Mar-25

3:49:21 PM

27

1400.00

TQEX

GENMAB A/S

27-Mar-25

3:49:22 PM

14

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:49:22 PM

4

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:49:44 PM

22

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:49:44 PM

22

1399.00

TQEX

GENMAB A/S

27-Mar-25

3:49:45 PM

8

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:49:45 PM

6

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:49:45 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:49:45 PM

30

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:49:45 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:49:45 PM

18

1399.00

AQEU

GENMAB A/S

27-Mar-25

3:49:46 PM

22

1398.50

CEUX

GENMAB A/S

27-Mar-25

3:51:53 PM

42

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:51:53 PM

37

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:51:53 PM

42

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:51:53 PM

37

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:51:53 PM

14

1400.00

XCSE

GENMAB A/S

27-Mar-25

3:51:53 PM

36

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:51:53 PM

2

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:51:53 PM

15

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:51:53 PM

71

1399.50

CEUX

GENMAB A/S

27-Mar-25

3:51:53 PM

7

1399.50

TQEX

GENMAB A/S

27-Mar-25

3:51:53 PM

15

1399.50

TQEX

GENMAB A/S

27-Mar-25

3:51:56 PM

17

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:51:56 PM

11

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:52:46 PM

9

1398.50

XCSE

GENMAB A/S

27-Mar-25

3:52:46 PM

9

1398.50

XCSE

GENMAB A/S

27-Mar-25

3:52:46 PM

42

1398.50

XCSE

121


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:52:46 PM

25

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:52:46 PM

10

1399.50

XCSE

GENMAB A/S

27-Mar-25

3:52:46 PM

25

1398.50

XCSE

GENMAB A/S

27-Mar-25

3:52:46 PM

75

1398.50

CEUX

GENMAB A/S

27-Mar-25

3:52:46 PM

22

1398.50

TQEX

GENMAB A/S

27-Mar-25

3:53:35 PM

9

1398.50

XCSE

GENMAB A/S

27-Mar-25

3:53:35 PM

25

1398.50

XCSE

GENMAB A/S

27-Mar-25

3:54:58 PM

2

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:58 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:58 PM

14

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:58 PM

42

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:58 PM

30

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:58 PM

25

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:58 PM

36

1398.50

CEUX

GENMAB A/S

27-Mar-25

3:54:58 PM

24

1398.00

AQEU

GENMAB A/S

27-Mar-25

3:54:59 PM

18

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:59 PM

39

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:59 PM

29

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:59 PM

30

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:59 PM

42

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:54:59 PM

30

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:56:09 PM

74

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:56:09 PM

37

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:56:09 PM

77

1397.00

CEUX

GENMAB A/S

27-Mar-25

3:56:09 PM

40

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:56:09 PM

27

1397.00

TQEX

GENMAB A/S

27-Mar-25

3:56:09 PM

23

1398.00

TQEX

GENMAB A/S

27-Mar-25

3:56:09 PM

22

1397.00

AQEU

GENMAB A/S

27-Mar-25

3:56:09 PM

33

1398.00

AQEU

GENMAB A/S

27-Mar-25

3:56:10 PM

32

1397.00

CEUX

GENMAB A/S

27-Mar-25

3:56:16 PM

1

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:56:16 PM

44

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:56:16 PM

12

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:56:17 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:56:17 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

3:56:56 PM

34

1398.50

CEUX

GENMAB A/S

27-Mar-25

3:56:56 PM

41

1398.50

CEUX

GENMAB A/S

27-Mar-25

3:57:07 PM

29

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:57:07 PM

18

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:57:07 PM

30

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:57:07 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:57:07 PM

2

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:57:07 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:57:08 PM

98

1399.00

XCSE

GENMAB A/S

27-Mar-25

3:57:08 PM

98

1399.00

XCSE

122


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

3:57:21 PM

29

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:57:21 PM

46

1397.50

XCSE

GENMAB A/S

27-Mar-25

3:57:21 PM

32

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:57:21 PM

40

1398.00

AQEU

GENMAB A/S

27-Mar-25

3:57:39 PM

9

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:59:49 PM

76

1398.00

XCSE

GENMAB A/S

27-Mar-25

3:59:49 PM

32

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:59:49 PM

24

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:59:49 PM

25

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:59:52 PM

28

1398.00

CEUX

GENMAB A/S

27-Mar-25

3:59:52 PM

25

1398.00

AQEU

GENMAB A/S

27-Mar-25

4:00:03 PM

26

1398.50

TQEX

GENMAB A/S

27-Mar-25

4:00:05 PM

26

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:00:05 PM

8

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:00:05 PM

1

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:00:05 PM

10

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:00:05 PM

8

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:00:05 PM

36

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:00:05 PM

4

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:00:05 PM

5

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:00:05 PM

5

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:00:11 PM

15

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:00:11 PM

1

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:00:11 PM

4

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:00:11 PM

5

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:00:11 PM

5

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:00:11 PM

5

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:00:12 PM

15

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:00:45 PM

74

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:01:06 PM

41

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:06 PM

12

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:06 PM

45

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:06 PM

77

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:01:06 PM

36

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:01:06 PM

22

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:01:07 PM

12

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:07 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:07 PM

8

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:07 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:07 PM

78

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:01:07 PM

45

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:07 PM

32

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:01:21 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:21 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:21 PM

32

1398.00

XCSE

123


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:01:21 PM

78

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:01:21 PM

45

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:21 PM

77

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:01:21 PM

2

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:01:21 PM

72

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:01:21 PM

5

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:01:21 PM

33

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:01:22 PM

11

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:01:22 PM

9

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:01:22 PM

16

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:01:34 PM

20

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:01:34 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:01:34 PM

7

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:01:34 PM

45

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:01:34 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:01:34 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:05:02 PM

73

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:05:02 PM

45

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:05:02 PM

2

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:05:02 PM

14

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:05:02 PM

10

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:05:02 PM

41

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:05:02 PM

75

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:05:02 PM

75

1396.00

CEUX

GENMAB A/S

27-Mar-25

4:05:02 PM

25

1396.50

TQEX

GENMAB A/S

27-Mar-25

4:05:02 PM

11

1396.50

AQEU

GENMAB A/S

27-Mar-25

4:05:02 PM

11

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:05:02 PM

19

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:05:02 PM

15

1396.50

AQEU

GENMAB A/S

27-Mar-25

4:05:12 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:05:12 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:05:12 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:05:12 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:05:12 PM

24

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:05:12 PM

8

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:05:12 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:05:12 PM

45

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:05:12 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:05:17 PM

10

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:05:17 PM

6

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:05:17 PM

5

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:05:17 PM

5

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:05:47 PM

73

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:05:47 PM

36

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:05:47 PM

4

1398.50

CEUX

124


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:05:47 PM

3

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:05:47 PM

34

1398.50

AQEU

GENMAB A/S

27-Mar-25

4:06:21 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:06:21 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:06:21 PM

8

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:06:21 PM

6

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:06:21 PM

24

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:07:20 PM

36

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:07:20 PM

33

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:07:48 PM

8

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:07:48 PM

36

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:07:48 PM

21

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:07:48 PM

14

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:07:48 PM

29

1400.00

TQEX

GENMAB A/S

27-Mar-25

4:07:55 PM

1

1400.00

AQEU

GENMAB A/S

27-Mar-25

4:08:07 PM

44

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:08:07 PM

75

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:08:07 PM

15

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:08:07 PM

24

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:08:07 PM

34

1400.00

AQEU

GENMAB A/S

27-Mar-25

4:08:11 PM

30

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:08:11 PM

36

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:08:11 PM

72

1399.50

CEUX

GENMAB A/S

27-Mar-25

4:08:21 PM

19

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:08:21 PM

41

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:08:21 PM

3

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:08:22 PM

10

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:08:40 PM

26

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:08:40 PM

30

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:08:40 PM

36

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:08:59 PM

74

1399.50

CEUX

GENMAB A/S

27-Mar-25

4:09:02 PM

12

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:09:36 PM

19

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:10:36 PM

30

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:10:40 PM

10

1399.50

CEUX

GENMAB A/S

27-Mar-25

4:10:42 PM

28

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:42 PM

48

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:42 PM

45

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:42 PM

11

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:42 PM

30

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:42 PM

25

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:10:42 PM

1

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:42 PM

9

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:42 PM

10

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:42 PM

6

1399.50

XCSE

125


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:10:42 PM

30

1399.00

TQEX

GENMAB A/S

27-Mar-25

4:10:42 PM

29

1399.00

AQEU

GENMAB A/S

27-Mar-25

4:10:43 PM

9

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:43 PM

30

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:43 PM

10

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:43 PM

9

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:10:48 PM

77

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:10:48 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:10:48 PM

12

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:10:48 PM

8

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:10:48 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:10:48 PM

4

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:10:48 PM

5

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:10:48 PM

4

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:10:48 PM

25

1399.00

TQEX

GENMAB A/S

27-Mar-25

4:11:09 PM

73

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:11:10 PM

3

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:11:12 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:12 PM

15

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:12 PM

38

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:12 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:12 PM

8

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:12 PM

44

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:12 PM

37

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:12 PM

6

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:12 PM

11

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:12 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

16

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

45

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

39

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

8

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

3

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:13 PM

38

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

8

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

8

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

14

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

25

1399.00

XCSE

126


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:11:14 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

14

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

8

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

45

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

38

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:14 PM

13

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:15 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:15 PM

9

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:15 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:16 PM

8

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:23 PM

13

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:41 PM

9

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:11:41 PM

38

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:11:41 PM

9

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:11:41 PM

8

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:11:41 PM

17

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:11:41 PM

9

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:11:41 PM

8

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:11:48 PM

36

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:48 PM

10

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:11:55 PM

13

1399.50

CEUX

GENMAB A/S

27-Mar-25

4:12:37 PM

10

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:37 PM

8

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:37 PM

17

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:37 PM

45

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:37 PM

3

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:37 PM

8

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:37 PM

32

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:37 PM

10

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:37 PM

10

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:37 PM

8

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:46 PM

9

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:50 PM

14

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:12:53 PM

36

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:12:56 PM

7

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:12:57 PM

8

1400.00

XCSE

GENMAB A/S

27-Mar-25

4:13:05 PM

36

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:13:06 PM

41

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:13:06 PM

20

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:13:28 PM

47

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:13:29 PM

5

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:13:29 PM

4

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:13:29 PM

36

1400.00

CEUX

127


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:13:29 PM

5

1400.00

CEUX

GENMAB A/S

27-Mar-25

4:13:44 PM

12

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:44 PM

39

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:44 PM

10

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:44 PM

4

1399.50

CEUX

GENMAB A/S

27-Mar-25

4:13:44 PM

36

1399.50

CEUX

GENMAB A/S

27-Mar-25

4:13:44 PM

4

1399.50

CEUX

GENMAB A/S

27-Mar-25

4:13:44 PM

5

1399.50

CEUX

GENMAB A/S

27-Mar-25

4:13:45 PM

44

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:54 PM

17

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:54 PM

10

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:54 PM

7

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:54 PM

18

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:54 PM

10

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:54 PM

9

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:54 PM

7

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:54 PM

22

1399.50

CEUX

GENMAB A/S

27-Mar-25

4:13:55 PM

2

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:55 PM

10

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:55 PM

10

1399.50

XCSE

GENMAB A/S

27-Mar-25

4:13:58 PM

74

1399.00

XCSE

GENMAB A/S

27-Mar-25

4:13:58 PM

75

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:13:58 PM

22

1399.00

TQEX

GENMAB A/S

27-Mar-25

4:13:58 PM

23

1399.00

AQEU

GENMAB A/S

27-Mar-25

4:14:18 PM

78

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:14:18 PM

23

1398.00

TQEX

GENMAB A/S

27-Mar-25

4:14:18 PM

10

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:14:26 PM

72

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:14:26 PM

16

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:14:27 PM

25

1397.00

TQEX

GENMAB A/S

27-Mar-25

4:15:02 PM

27

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:15:02 PM

19

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:15:02 PM

16

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:15:04 PM

5

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:15:18 PM

53

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:15:59 PM

10

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:16:08 PM

5

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:16:29 PM

10

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:16:29 PM

12

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:16:29 PM

11

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:16:59 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:16:59 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:16:59 PM

1

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:16:59 PM

45

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:16:59 PM

9

1397.00

XCSE

128


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:16:59 PM

8

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:16:59 PM

32

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:17:14 PM

30

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:17:14 PM

20

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:17:14 PM

15

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:17:23 PM

45

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:23 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:23 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:23 PM

26

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:23 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

8

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

9

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

1

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

10

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

11

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

44

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

29

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

12

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

45

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

11

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:17:53 PM

22

1396.50

TQEX

GENMAB A/S

27-Mar-25

4:17:54 PM

17

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:54 PM

2

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:55 PM

13

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:55 PM

3

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:55 PM

25

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:55 PM

13

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:56 PM

18

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:56 PM

8

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:56 PM

9

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:56 PM

1

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:58 PM

9

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:17:58 PM

10

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:18:09 PM

28

1396.50

CEUX

GENMAB A/S

27-Mar-25

4:18:09 PM

17

1396.50

CEUX

GENMAB A/S

27-Mar-25

4:18:39 PM

26

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:18:39 PM

7

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:18:39 PM

8

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:18:39 PM

17

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:18:39 PM

8

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:18:39 PM

8

1396.50

XCSE

129


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:18:39 PM

78

1396.00

CEUX

GENMAB A/S

27-Mar-25

4:18:39 PM

10

1396.50

CEUX

GENMAB A/S

27-Mar-25

4:18:39 PM

28

1396.50

CEUX

GENMAB A/S

27-Mar-25

4:18:39 PM

21

1396.50

CEUX

GENMAB A/S

27-Mar-25

4:18:40 PM

11

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:19:08 PM

72

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:20:49 PM

76

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:20:50 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:20:51 PM

2

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:20:51 PM

6

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:21:11 PM

75

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:21:11 PM

32

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:21:29 PM

19

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:21:31 PM

7

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:22:08 PM

15

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:22:08 PM

45

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:22:08 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:22:08 PM

12

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:22:08 PM

1

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:22:08 PM

1

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:22:08 PM

69

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:22:08 PM

31

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:22:08 PM

37

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:22:28 PM

65

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:22:34 PM

19

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:22:45 PM

32

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:22:52 PM

21

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:22:55 PM

49

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:23:03 PM

12

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:23:03 PM

30

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:23:03 PM

34

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:23:08 PM

44

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:23:08 PM

4

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:23:59 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:23:59 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:23:59 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:24:01 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:24:13 PM

12

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:13 PM

19

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:24:13 PM

36

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:24:17 PM

45

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:17 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:17 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:17 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:17 PM

8

1397.00

XCSE

130


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:24:17 PM

16

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

43

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

41

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

11

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

18

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:18 PM

28

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:19 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:24:44 PM

1

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:24:44 PM

30

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:24:44 PM

1

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:24:44 PM

16

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:24:44 PM

7

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:25:29 PM

17

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:25:29 PM

9

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:25:29 PM

21

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:25:29 PM

12

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:26:08 PM

3

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

46

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

42

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

30

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

14

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

11

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

12

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

13

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

45

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

28

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:08 PM

26

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:26:08 PM

24

1396.50

CEUX

GENMAB A/S

27-Mar-25

4:26:08 PM

29

1396.50

TQEX

GENMAB A/S

27-Mar-25

4:26:08 PM

25

1396.50

AQEU

GENMAB A/S

27-Mar-25

4:26:09 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

45

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

28

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

9

1397.00

XCSE

131


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:26:09 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

25

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

1

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

45

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:09 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:10 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:10 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:10 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:10 PM

2

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:10 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:10 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:10 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:11 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:11 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:11 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:11 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:11 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:11 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:11 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:13 PM

14

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:15 PM

29

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:15 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:16 PM

29

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:16 PM

36

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:26:21 PM

78

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:26:56 PM

12

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:26:56 PM

16

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:27:04 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:27:08 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:08 PM

42

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:08 PM

28

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:08 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:08 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:27 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:27 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:27 PM

23

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:27 PM

5

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:27 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:54 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:54 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:27:54 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:28:11 PM

10

1397.50

XCSE

132


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:28:14 PM

7

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:28:32 PM

12

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:28:37 PM

10

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:28:37 PM

11

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:29:06 PM

9

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:29:50 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:29:50 PM

5

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:29:54 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:29:54 PM

25

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:29:54 PM

1

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:03 PM

75

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:30:03 PM

42

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:30:03 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:03 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:03 PM

36

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:03 PM

30

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:03 PM

30

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:03 PM

37

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:30:03 PM

20

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:30:03 PM

27

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:30:05 PM

19

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:30:05 PM

30

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:30:05 PM

2

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:30:05 PM

12

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:30:05 PM

35

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:30:05 PM

36

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:05 PM

5

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:25 PM

1

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:34 PM

29

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:34 PM

30

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:34 PM

24

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:34 PM

1

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:34 PM

13

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:34 PM

2

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:34 PM

12

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:34 PM

2

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:40 PM

45

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:40 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:40 PM

8

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:41 PM

7

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:46 PM

11

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:50 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:50 PM

45

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:50 PM

75

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:30:50 PM

9

1398.00

XCSE

133


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:30:50 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:50 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:30:50 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:50 PM

36

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:50 PM

28

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:30:50 PM

19

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:30:50 PM

4

1397.50

AQEU

GENMAB A/S

27-Mar-25

4:30:51 PM

5

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:51 PM

5

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:51 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:30:52 PM

12

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:30:52 PM

4

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:30:52 PM

15

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:30:52 PM

19

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:31:05 PM

13

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:31:33 PM

19

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:31:33 PM

24

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:31:35 PM

22

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:31:41 PM

10

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:31:52 PM

78

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:31:52 PM

48

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:31:52 PM

75

1396.00

CEUX

GENMAB A/S

27-Mar-25

4:31:52 PM

39

1395.00

CEUX

GENMAB A/S

27-Mar-25

4:31:52 PM

23

1395.50

TQEX

GENMAB A/S

27-Mar-25

4:31:52 PM

28

1396.50

TQEX

GENMAB A/S

27-Mar-25

4:31:52 PM

38

1395.50

AQEU

GENMAB A/S

27-Mar-25

4:31:52 PM

25

1396.50

AQEU

GENMAB A/S

27-Mar-25

4:31:56 PM

14

1395.00

XCSE

GENMAB A/S

27-Mar-25

4:31:56 PM

10

1395.00

XCSE

GENMAB A/S

27-Mar-25

4:31:56 PM

11

1395.00

XCSE

GENMAB A/S

27-Mar-25

4:31:56 PM

13

1395.00

XCSE

GENMAB A/S

27-Mar-25

4:31:56 PM

1

1395.00

XCSE

GENMAB A/S

27-Mar-25

4:31:56 PM

41

1395.00

XCSE

GENMAB A/S

27-Mar-25

4:32:15 PM

24

1394.00

XCSE

GENMAB A/S

27-Mar-25

4:32:15 PM

31

1394.50

TQEX

GENMAB A/S

27-Mar-25

4:32:15 PM

24

1394.00

AQEU

GENMAB A/S

27-Mar-25

4:32:19 PM

54

1394.00

CEUX

GENMAB A/S

27-Mar-25

4:32:26 PM

43

1394.00

XCSE

GENMAB A/S

27-Mar-25

4:32:26 PM

8

1394.00

XCSE

GENMAB A/S

27-Mar-25

4:32:58 PM

2

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:32:58 PM

43

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:00 PM

32

1394.00

CEUX

GENMAB A/S

27-Mar-25

4:33:14 PM

45

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:14 PM

10

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:14 PM

8

1393.50

XCSE

134


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:33:14 PM

22

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:14 PM

10

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:14 PM

76

1393.50

CEUX

GENMAB A/S

27-Mar-25

4:33:26 PM

7

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:26 PM

16

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:26 PM

17

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:38 PM

38

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:39 PM

31

1393.50

XCSE

GENMAB A/S

27-Mar-25

4:33:49 PM

34

1393.50

TQEX

GENMAB A/S

27-Mar-25

4:33:49 PM

17

1393.50

AQEU

GENMAB A/S

27-Mar-25

4:33:57 PM

9

1394.00

XCSE

GENMAB A/S

27-Mar-25

4:33:57 PM

5

1394.00

XCSE

GENMAB A/S

27-Mar-25

4:33:57 PM

27

1394.00

XCSE

GENMAB A/S

27-Mar-25

4:34:06 PM

16

1394.00

CEUX

GENMAB A/S

27-Mar-25

4:34:16 PM

19

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:16 PM

9

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:17 PM

10

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:17 PM

12

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:26 PM

8

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:26 PM

9

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:26 PM

19

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:36 PM

14

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:36 PM

5

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:38 PM

19

1394.00

CEUX

GENMAB A/S

27-Mar-25

4:34:46 PM

8

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:46 PM

8

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:47 PM

15

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:56 PM

7

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:34:56 PM

17

1394.00

CEUX

GENMAB A/S

27-Mar-25

4:35:22 PM

40

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:35:22 PM

34

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:35:22 PM

39

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:35:22 PM

10

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:35:22 PM

23

1394.50

AQEU

GENMAB A/S

27-Mar-25

4:35:30 PM

33

1394.50

AQEU

GENMAB A/S

27-Mar-25

4:36:02 PM

36

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:36:03 PM

10

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:03 PM

9

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:11 PM

9

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:11 PM

10

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:11 PM

45

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:11 PM

11

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:11 PM

24

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:11 PM

10

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:11 PM

9

1394.00

CEUX

135


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:36:11 PM

3

1394.00

CEUX

GENMAB A/S

27-Mar-25

4:36:13 PM

3

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:20 PM

6

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:36:20 PM

30

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:36:21 PM

41

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:36:44 PM

9

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:44 PM

10

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:36:44 PM

36

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:36:45 PM

28

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:36:59 PM

53

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:37:00 PM

45

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:37:00 PM

18

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:37:00 PM

19

1394.50

XCSE

GENMAB A/S

27-Mar-25

4:37:00 PM

55

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:37:27 PM

77

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:37:27 PM

11

1395.50

CEUX

GENMAB A/S

27-Mar-25

4:37:27 PM

9

1395.50

CEUX

GENMAB A/S

27-Mar-25

4:37:31 PM

65

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:37:31 PM

13

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:37:31 PM

43

1396.50

CEUX

GENMAB A/S

27-Mar-25

4:37:31 PM

16

1395.50

CEUX

GENMAB A/S

27-Mar-25

4:37:31 PM

19

1396.00

TQEX

GENMAB A/S

27-Mar-25

4:37:31 PM

3

1396.00

TQEX

GENMAB A/S

27-Mar-25

4:37:31 PM

35

1396.00

AQEU

GENMAB A/S

27-Mar-25

4:38:04 PM

25

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:38:11 PM

61

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:11 PM

48

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:38:11 PM

17

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:11 PM

72

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:11 PM

36

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:38:11 PM

27

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:38:11 PM

29

1397.00

TQEX

GENMAB A/S

27-Mar-25

4:38:11 PM

23

1398.00

TQEX

GENMAB A/S

27-Mar-25

4:38:26 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:26 PM

22

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:26 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:26 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:26 PM

13

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:26 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:46 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:46 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:46 PM

22

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:46 PM

12

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:46 PM

8

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:38:46 PM

13

1397.00

XCSE

136


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:38:49 PM

76

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:38:49 PM

4

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:38:49 PM

7

1395.50

CEUX

GENMAB A/S

27-Mar-25

4:38:49 PM

3

1395.50

CEUX

GENMAB A/S

27-Mar-25

4:38:49 PM

3

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:38:50 PM

4

1394.50

CEUX

GENMAB A/S

27-Mar-25

4:39:26 PM

11

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:26 PM

9

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:26 PM

7

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:26 PM

13

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:26 PM

10

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:45 PM

2

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:45 PM

10

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:45 PM

9

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:45 PM

17

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:49 PM

10

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:49 PM

9

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:49 PM

10

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:39:49 PM

22

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:40:18 PM

42

1395.50

XCSE

GENMAB A/S

27-Mar-25

4:40:26 PM

3

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:40:27 PM

1

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:40:27 PM

6

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:41:16 PM

4

1396.00

CEUX

GENMAB A/S

27-Mar-25

4:41:16 PM

4

1396.00

CEUX

GENMAB A/S

27-Mar-25

4:41:16 PM

36

1396.00

CEUX

GENMAB A/S

27-Mar-25

4:41:22 PM

32

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:41:22 PM

19

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:41:22 PM

2

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:41:22 PM

45

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:41:26 PM

9

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:41:26 PM

8

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:41:38 PM

63

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:41:55 PM

4

1396.00

XCSE

GENMAB A/S

27-Mar-25

4:41:56 PM

27

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:42:24 PM

44

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:24 PM

54

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:25 PM

12

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:42:27 PM

20

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:42:28 PM

66

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:42:29 PM

78

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:42:29 PM

19

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:42:29 PM

27

1398.00

TQEX

GENMAB A/S

27-Mar-25

4:42:29 PM

23

1398.00

AQEU

GENMAB A/S

27-Mar-25

4:42:50 PM

36

1397.50

CEUX

137


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:42:50 PM

34

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:42:50 PM

21

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:42:50 PM

23

1397.00

TQEX

GENMAB A/S

27-Mar-25

4:42:50 PM

23

1397.00

AQEU

GENMAB A/S

27-Mar-25

4:42:51 PM

50

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:51 PM

45

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:51 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:51 PM

29

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:51 PM

10

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:51 PM

38

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:51 PM

5

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:51 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:52 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:52 PM

8

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:52 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:52 PM

30

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:52 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:52 PM

8

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:52 PM

30

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:52 PM

8

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:42:52 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:43:06 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:43:08 PM

53

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:43:08 PM

9

1398.00

XCSE

GENMAB A/S

27-Mar-25

4:43:24 PM

19

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:43:36 PM

13

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:43:36 PM

27

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:43:36 PM

4

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:43:36 PM

45

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:43:36 PM

9

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:43:40 PM

7

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:43:40 PM

63

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:43:52 PM

25

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:43:52 PM

56

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:43:52 PM

22

1398.00

AQEU

GENMAB A/S

27-Mar-25

4:44:24 PM

8

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:44:24 PM

9

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:44:24 PM

14

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:44:24 PM

41

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:44:31 PM

78

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:44:31 PM

36

1398.00

CEUX

GENMAB A/S

27-Mar-25

4:44:54 PM

22

1398.00

AQEU

GENMAB A/S

27-Mar-25

4:45:12 PM

73

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:45:12 PM

24

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:45:28 PM

42

1397.50

XCSE

138


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:45:40 PM

35

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:45:44 PM

36

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:45:44 PM

21

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:45:44 PM

9

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:46:02 PM

5

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:46:02 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:46:02 PM

36

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:46:02 PM

5

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:46:03 PM

11

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:46:03 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:46:07 PM

7

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:07 PM

14

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:08 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:09 PM

12

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:13 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:14 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:18 PM

11

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:18 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:19 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:23 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:23 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:24 PM

13

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:46:29 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:46:29 PM

78

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:46:29 PM

10

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:46:29 PM

5

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:46:29 PM

45

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:46:29 PM

4

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:46:29 PM

65

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:46:29 PM

4

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:46:29 PM

27

1397.00

AQEU

GENMAB A/S

27-Mar-25

4:46:30 PM

16

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:46:30 PM

12

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:46:30 PM

15

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:46:30 PM

37

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:46:41 PM

9

1397.00

XCSE

GENMAB A/S

27-Mar-25

4:47:01 PM

20

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:47:01 PM

36

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:47:01 PM

8

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:47:01 PM

34

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:47:01 PM

24

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:47:02 PM

7

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:47:09 PM

15

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:47:19 PM

11

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:47:19 PM

15

1397.50

CEUX

139


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:47:19 PM

17

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:48:21 PM

35

1396.50

XCSE

GENMAB A/S

27-Mar-25

4:48:22 PM

9

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:48:22 PM

63

1397.00

CEUX

GENMAB A/S

27-Mar-25

4:49:47 PM

9

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:47 PM

36

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:54 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:49:54 PM

8

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:49:54 PM

9

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:49:54 PM

10

1397.50

XCSE

GENMAB A/S

27-Mar-25

4:49:54 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:54 PM

5

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:54 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:55 PM

9

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:55 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:55 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:55 PM

23

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:55 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:49:55 PM

2

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:49:55 PM

2

1397.50

TQEX

GENMAB A/S

27-Mar-25

4:49:58 PM

8

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:50:16 PM

4

1397.50

CEUX

GENMAB A/S

27-Mar-25

4:50:16 PM

39

1398.00

AQEU

GENMAB A/S

27-Mar-25

4:50:19 PM

98

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:50:19 PM

78

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:50:19 PM

74

1398.50

CEUX

GENMAB A/S

27-Mar-25

4:50:20 PM

13

1398.50

AQEU

GENMAB A/S

27-Mar-25

4:50:31 PM

36

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:50:31 PM

78

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:50:31 PM

24

1399.00

CEUX

GENMAB A/S

27-Mar-25

4:50:31 PM

2

1399.00

TQEX

GENMAB A/S

27-Mar-25

4:50:31 PM

2

1399.00

TQEX

GENMAB A/S

27-Mar-25

4:50:37 PM

32

1398.50

XCSE

GENMAB A/S

27-Mar-25

4:51:00 PM

71

1402.00

CEUX

GENMAB A/S

27-Mar-25

4:51:00 PM

27

1402.00

CEUX

GENMAB A/S

27-Mar-25

4:51:00 PM

24

1402.00

CEUX

GENMAB A/S

27-Mar-25

4:51:00 PM

11

1402.00

TQEX

GENMAB A/S

27-Mar-25

4:51:00 PM

11

1402.00

TQEX

GENMAB A/S

27-Mar-25

4:51:09 PM

74

1401.50

XCSE

GENMAB A/S

27-Mar-25

4:51:09 PM

32

1402.00

CEUX

GENMAB A/S

27-Mar-25

4:51:09 PM

2

1402.00

TQEX

GENMAB A/S

27-Mar-25

4:51:09 PM

11

1402.00

TQEX

GENMAB A/S

27-Mar-25

4:51:09 PM

2

1402.00

TQEX

GENMAB A/S

27-Mar-25

4:51:09 PM

23

1401.50

TQEX

GENMAB A/S

27-Mar-25

4:51:09 PM

29

1401.50

AQEU

140


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:51:16 PM

77

1401.50

XCSE

GENMAB A/S

27-Mar-25

4:51:23 PM

25

1402.00

CEUX

GENMAB A/S

27-Mar-25

4:51:46 PM

3

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:46 PM

11

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:46 PM

22

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:47 PM

36

1403.00

CEUX

GENMAB A/S

27-Mar-25

4:51:47 PM

25

1403.00

AQEU

GENMAB A/S

27-Mar-25

4:51:51 PM

8

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

73

1402.50

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

10

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

17

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

45

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

24

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

9

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

45

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

28

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

10

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:51 PM

25

1403.00

CEUX

GENMAB A/S

27-Mar-25

4:51:51 PM

4

1403.00

CEUX

GENMAB A/S

27-Mar-25

4:51:51 PM

5

1403.00

CEUX

GENMAB A/S

27-Mar-25

4:51:51 PM

36

1403.00

CEUX

GENMAB A/S

27-Mar-25

4:51:51 PM

2

1403.00

CEUX

GENMAB A/S

27-Mar-25

4:51:51 PM

44

1402.50

CEUX

GENMAB A/S

27-Mar-25

4:51:51 PM

31

1402.50

TQEX

GENMAB A/S

27-Mar-25

4:51:51 PM

10

1402.00

AQEU

GENMAB A/S

27-Mar-25

4:51:52 PM

8

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

13

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

9

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

45

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

8

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

9

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

45

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

8

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

9

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

30

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

2

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

6

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

1

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

8

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

45

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:51:52 PM

14

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:52:03 PM

10

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:52:03 PM

45

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:52:03 PM

31

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:52:03 PM

9

1403.00

XCSE

141


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:52:03 PM

3

1403.00

XCSE

GENMAB A/S

27-Mar-25

4:52:19 PM

30

1403.50

CEUX

GENMAB A/S

27-Mar-25

4:52:19 PM

3

1403.50

TQEX

GENMAB A/S

27-Mar-25

4:52:19 PM

19

1403.50

TQEX

GENMAB A/S

27-Mar-25

4:52:20 PM

25

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:52:30 PM

31

1404.50

XCSE

GENMAB A/S

27-Mar-25

4:52:30 PM

64

1403.50

XCSE

GENMAB A/S

27-Mar-25

4:52:30 PM

45

1404.50

XCSE

GENMAB A/S

27-Mar-25

4:52:30 PM

22

1404.50

XCSE

GENMAB A/S

27-Mar-25

4:52:30 PM

2

1403.50

XCSE

GENMAB A/S

27-Mar-25

4:52:30 PM

73

1404.50

XCSE

GENMAB A/S

27-Mar-25

4:52:30 PM

17

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:52:30 PM

2

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:52:30 PM

32

1405.00

CEUX

GENMAB A/S

27-Mar-25

4:52:30 PM

22

1405.00

CEUX

GENMAB A/S

27-Mar-25

4:52:30 PM

6

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:52:30 PM

26

1404.50

TQEX

GENMAB A/S

27-Mar-25

4:52:30 PM

11

1403.50

TQEX

GENMAB A/S

27-Mar-25

4:52:30 PM

23

1404.00

AQEU

GENMAB A/S

27-Mar-25

4:52:30 PM

12

1404.50

AQEU

GENMAB A/S

27-Mar-25

4:52:31 PM

22

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:52:31 PM

25

1404.00

AQEU

GENMAB A/S

27-Mar-25

4:52:32 PM

18

1404.00

TQEX

GENMAB A/S

27-Mar-25

4:52:43 PM

51

1404.00

XCSE

GENMAB A/S

27-Mar-25

4:52:50 PM

12

1404.00

TQEX

GENMAB A/S

27-Mar-25

4:53:16 PM

10

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:53:18 PM

17

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:53:35 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:35 PM

4

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:35 PM

2

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:35 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:35 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:35 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:35 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:35 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:36 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:36 PM

4

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:36 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:38 PM

4

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:38 PM

4

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:38 PM

4

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:38 PM

36

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:39 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:39 PM

5

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:53:39 PM

4

1404.50

CEUX

142


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

27-Mar-25

4:53:49 PM

8

1403.50

XCSE

GENMAB A/S

27-Mar-25

4:53:57 PM

10

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:53:57 PM

10

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:54:03 PM

17

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:54:10 PM

41

1404.00

CEUX

GENMAB A/S

27-Mar-25

4:54:13 PM

19

1404.00

TQEX

GENMAB A/S

27-Mar-25

4:54:13 PM

10

1404.00

TQEX

GENMAB A/S

27-Mar-25

4:54:21 PM

45

1404.50

XCSE

GENMAB A/S

27-Mar-25

4:54:21 PM

8

1404.50

XCSE

GENMAB A/S

27-Mar-25

4:54:21 PM

10

1404.50

XCSE

GENMAB A/S

27-Mar-25

4:54:21 PM

10

1404.50

XCSE

GENMAB A/S

27-Mar-25

4:54:29 PM

78

1404.00

XCSE

GENMAB A/S

27-Mar-25

4:54:37 PM

10

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:37 PM

1

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:37 PM

9

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:37 PM

9

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:37 PM

45

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:37 PM

14

1404.50

CEUX

GENMAB A/S

27-Mar-25

4:54:38 PM

10

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:38 PM

17

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:38 PM

45

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:38 PM

8

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:38 PM

10

1405.00

XCSE

GENMAB A/S

27-Mar-25

4:54:52 PM

28

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

11

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

30

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

10

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

9

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

9

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

30

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

10

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

8

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

9

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

8

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:53 PM

30

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:54 PM

10

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:54 PM

9

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:54 PM

9

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:56 PM

30

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:56 PM

9

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:56 PM

9

1405.50

XCSE

GENMAB A/S

27-Mar-25

4:54:56 PM

10

1405.50

XCSE

GENMAB A/S

28-Mar-25

10:09:21 AM

16

1387.00

TQEX

GENMAB A/S

28-Mar-25

10:10:35 AM

62

1386.00

XCSE

GENMAB A/S

28-Mar-25

10:10:35 AM

64

1387.00

XCSE

143


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

10:10:35 AM

73

1386.00

CEUX

GENMAB A/S

28-Mar-25

10:10:35 AM

50

1387.00

TQEX

GENMAB A/S

28-Mar-25

10:10:35 AM

64

1386.00

TQEX

GENMAB A/S

28-Mar-25

10:10:35 AM

71

1386.50

AQEU

GENMAB A/S

28-Mar-25

10:10:35 AM

49

1385.50

AQEU

GENMAB A/S

28-Mar-25

10:10:35 AM

21

1385.50

AQEU

GENMAB A/S

28-Mar-25

10:12:11 AM

59

1387.50

CEUX

GENMAB A/S

28-Mar-25

10:12:11 AM

8

1387.50

AQEU

GENMAB A/S

28-Mar-25

10:12:11 AM

14

1387.50

AQEU

GENMAB A/S

28-Mar-25

10:21:09 AM

36

1388.50

CEUX

GENMAB A/S

28-Mar-25

10:21:09 AM

25

1388.50

CEUX

GENMAB A/S

28-Mar-25

10:21:09 AM

79

1388.50

CEUX

GENMAB A/S

28-Mar-25

10:21:09 AM

25

1388.50

TQEX

GENMAB A/S

28-Mar-25

10:21:09 AM

22

1388.50

AQEU

GENMAB A/S

28-Mar-25

10:21:10 AM

17

1389.50

TQEX

GENMAB A/S

28-Mar-25

10:21:13 AM

10

1389.50

TQEX

GENMAB A/S

28-Mar-25

10:22:43 AM

55

1389.50

XCSE

GENMAB A/S

28-Mar-25

10:22:43 AM

23

1389.50

XCSE

GENMAB A/S

28-Mar-25

10:22:43 AM

36

1389.50

CEUX

GENMAB A/S

28-Mar-25

10:22:45 AM

34

1390.00

CEUX

GENMAB A/S

28-Mar-25

10:22:45 AM

15

1390.00

CEUX

GENMAB A/S

28-Mar-25

10:22:54 AM

41

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:22:54 AM

11

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:22:54 AM

30

1390.00

CEUX

GENMAB A/S

28-Mar-25

10:24:35 AM

36

1390.00

CEUX

GENMAB A/S

28-Mar-25

10:25:32 AM

1

1389.50

XCSE

GENMAB A/S

28-Mar-25

10:25:32 AM

73

1389.50

XCSE

GENMAB A/S

28-Mar-25

10:25:32 AM

28

1389.50

TQEX

GENMAB A/S

28-Mar-25

10:25:39 AM

20

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:25:39 AM

53

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:25:39 AM

26

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:25:39 AM

12

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:25:39 AM

21

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:25:39 AM

41

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:25:39 AM

28

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:25:39 AM

32

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:25:39 AM

15

1389.00

CEUX

GENMAB A/S

28-Mar-25

10:25:40 AM

58

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:26:12 AM

41

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:26:12 AM

26

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:26:12 AM

30

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:26:12 AM

36

1390.00

CEUX

GENMAB A/S

28-Mar-25

10:26:28 AM

26

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:26:28 AM

41

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:26:28 AM

30

1390.00

XCSE

144


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

10:26:28 AM

4

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:26:28 AM

24

1389.50

TQEX

GENMAB A/S

28-Mar-25

10:26:29 AM

79

1389.50

XCSE

GENMAB A/S

28-Mar-25

10:26:29 AM

5

1390.00

CEUX

GENMAB A/S

28-Mar-25

10:26:29 AM

5

1390.00

CEUX

GENMAB A/S

28-Mar-25

10:26:29 AM

17

1389.50

TQEX

GENMAB A/S

28-Mar-25

10:26:29 AM

14

1389.50

TQEX

GENMAB A/S

28-Mar-25

10:26:38 AM

10

1390.50

CEUX

GENMAB A/S

28-Mar-25

10:26:38 AM

13

1390.50

CEUX

GENMAB A/S

28-Mar-25

10:26:38 AM

43

1390.00

CEUX

GENMAB A/S

28-Mar-25

10:26:43 AM

22

1390.50

TQEX

GENMAB A/S

28-Mar-25

10:27:44 AM

54

1391.00

XCSE

GENMAB A/S

28-Mar-25

10:27:44 AM

34

1391.00

XCSE

GENMAB A/S

28-Mar-25

10:27:44 AM

13

1391.00

XCSE

GENMAB A/S

28-Mar-25

10:27:44 AM

33

1391.00

XCSE

GENMAB A/S

28-Mar-25

10:27:45 AM

28

1391.50

TQEX

GENMAB A/S

28-Mar-25

10:28:46 AM

43

1392.00

XCSE

GENMAB A/S

28-Mar-25

10:28:46 AM

41

1392.00

XCSE

GENMAB A/S

28-Mar-25

10:28:46 AM

78

1392.00

XCSE

GENMAB A/S

28-Mar-25

10:28:46 AM

17

1392.00

XCSE

GENMAB A/S

28-Mar-25

10:28:46 AM

80

1392.00

CEUX

GENMAB A/S

28-Mar-25

10:28:46 AM

24

1392.00

AQEU

GENMAB A/S

28-Mar-25

10:29:45 AM

17

1393.00

XCSE

GENMAB A/S

28-Mar-25

10:29:45 AM

41

1393.00

XCSE

GENMAB A/S

28-Mar-25

10:29:45 AM

43

1393.00

XCSE

GENMAB A/S

28-Mar-25

10:29:45 AM

32

1392.50

CEUX

GENMAB A/S

28-Mar-25

10:29:45 AM

26

1392.50

TQEX

GENMAB A/S

28-Mar-25

10:29:49 AM

76

1392.00

XCSE

GENMAB A/S

28-Mar-25

10:29:49 AM

61

1392.50

XCSE

GENMAB A/S

28-Mar-25

10:29:49 AM

14

1392.00

CEUX

GENMAB A/S

28-Mar-25

10:29:49 AM

66

1392.00

CEUX

GENMAB A/S

28-Mar-25

10:29:51 AM

45

1392.00

XCSE

GENMAB A/S

28-Mar-25

10:29:51 AM

14

1392.00

XCSE

GENMAB A/S

28-Mar-25

10:30:05 AM

78

1392.00

XCSE

GENMAB A/S

28-Mar-25

10:30:05 AM

17

1392.00

CEUX

GENMAB A/S

28-Mar-25

10:30:05 AM

62

1392.00

CEUX

GENMAB A/S

28-Mar-25

10:30:19 AM

30

1391.50

XCSE

GENMAB A/S

28-Mar-25

10:30:19 AM

41

1391.50

XCSE

GENMAB A/S

28-Mar-25

10:30:19 AM

16

1391.50

XCSE

GENMAB A/S

28-Mar-25

10:30:20 AM

79

1391.00

XCSE

GENMAB A/S

28-Mar-25

10:30:20 AM

76

1391.00

CEUX

GENMAB A/S

28-Mar-25

10:31:38 AM

79

1390.00

XCSE

GENMAB A/S

28-Mar-25

10:31:38 AM

75

1390.00

CEUX

GENMAB A/S

28-Mar-25

10:32:12 AM

29

1389.00

TQEX

GENMAB A/S

28-Mar-25

10:32:24 AM

76

1388.50

XCSE

145


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

10:32:24 AM

76

1388.50

CEUX

GENMAB A/S

28-Mar-25

10:32:25 AM

2

1387.50

XCSE

GENMAB A/S

28-Mar-25

10:32:25 AM

77

1387.50

XCSE

GENMAB A/S

28-Mar-25

10:32:26 AM

45

1387.00

CEUX

GENMAB A/S

28-Mar-25

10:32:28 AM

11

1387.00

CEUX

GENMAB A/S

28-Mar-25

10:32:30 AM

74

1386.00

XCSE

GENMAB A/S

28-Mar-25

10:32:30 AM

12

1385.50

CEUX

GENMAB A/S

28-Mar-25

10:32:30 AM

35

1385.50

CEUX

GENMAB A/S

28-Mar-25

10:33:05 AM

14

1384.50

CEUX

GENMAB A/S

28-Mar-25

10:33:12 AM

6

1385.00

AQEU

GENMAB A/S

28-Mar-25

10:33:35 AM

77

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:33:35 AM

25

1386.50

CEUX

GENMAB A/S

28-Mar-25

10:33:35 AM

3

1386.50

TQEX

GENMAB A/S

28-Mar-25

10:35:26 AM

74

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:36:00 AM

76

1385.50

XCSE

GENMAB A/S

28-Mar-25

10:36:00 AM

25

1385.50

CEUX

GENMAB A/S

28-Mar-25

10:37:31 AM

33

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:37:31 AM

17

1386.50

CEUX

GENMAB A/S

28-Mar-25

10:38:57 AM

52

1386.50

CEUX

GENMAB A/S

28-Mar-25

10:40:02 AM

30

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:40:02 AM

80

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:40:02 AM

41

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:40:02 AM

12

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:40:02 AM

73

1386.50

CEUX

GENMAB A/S

28-Mar-25

10:40:02 AM

27

1386.00

TQEX

GENMAB A/S

28-Mar-25

10:40:02 AM

22

1386.50

AQEU

GENMAB A/S

28-Mar-25

10:40:03 AM

18

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:40:03 AM

43

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:40:37 AM

50

1387.50

CEUX

GENMAB A/S

28-Mar-25

10:44:41 AM

26

1387.00

XCSE

GENMAB A/S

28-Mar-25

10:44:41 AM

55

1387.00

XCSE

GENMAB A/S

28-Mar-25

10:44:41 AM

13

1387.00

XCSE

GENMAB A/S

28-Mar-25

10:44:41 AM

23

1387.00

TQEX

GENMAB A/S

28-Mar-25

10:44:52 AM

13

1387.00

XCSE

GENMAB A/S

28-Mar-25

10:44:52 AM

7

1387.00

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

12

1386.00

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

41

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

30

1387.00

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

53

1386.00

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

7

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

11

1386.00

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

18

1387.00

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

13

1386.00

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

12

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

30

1386.00

XCSE

146


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

10:45:50 AM

79

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

35

1386.50

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

41

1386.00

XCSE

GENMAB A/S

28-Mar-25

10:45:50 AM

56

1385.50

CEUX

GENMAB A/S

28-Mar-25

10:45:50 AM

58

1386.50

CEUX

GENMAB A/S

28-Mar-25

10:45:50 AM

5

1386.00

TQEX

GENMAB A/S

28-Mar-25

10:45:50 AM

26

1386.50

AQEU

GENMAB A/S

28-Mar-25

10:45:51 AM

23

1385.50

XCSE

GENMAB A/S

28-Mar-25

10:46:02 AM

27

1385.50

XCSE

GENMAB A/S

28-Mar-25

10:46:02 AM

30

1385.50

XCSE

GENMAB A/S

28-Mar-25

10:46:14 AM

15

1385.00

AQEU

GENMAB A/S

28-Mar-25

10:46:44 AM

10

1384.50

XCSE

GENMAB A/S

28-Mar-25

10:46:44 AM

58

1384.50

XCSE

GENMAB A/S

28-Mar-25

10:46:44 AM

29

1385.00

TQEX

GENMAB A/S

28-Mar-25

10:46:44 AM

1

1385.00

AQEU

GENMAB A/S

28-Mar-25

10:47:06 AM

9

1384.50

XCSE

GENMAB A/S

28-Mar-25

10:48:07 AM

24

1384.00

CEUX

GENMAB A/S

28-Mar-25

10:48:10 AM

12

1384.00

XCSE

GENMAB A/S

28-Mar-25

10:48:10 AM

41

1384.00

XCSE

GENMAB A/S

28-Mar-25

10:48:21 AM

41

1384.00

XCSE

GENMAB A/S

28-Mar-25

10:48:21 AM

6

1384.00

XCSE

GENMAB A/S

28-Mar-25

10:48:41 AM

77

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:48:41 AM

64

1382.50

CEUX

GENMAB A/S

28-Mar-25

10:48:41 AM

16

1382.50

CEUX

GENMAB A/S

28-Mar-25

10:48:41 AM

23

1383.50

TQEX

GENMAB A/S

28-Mar-25

10:48:41 AM

38

1383.50

AQEU

GENMAB A/S

28-Mar-25

10:49:21 AM

74

1382.00

XCSE

GENMAB A/S

28-Mar-25

10:49:21 AM

9

1382.00

TQEX

GENMAB A/S

28-Mar-25

10:49:21 AM

20

1382.00

TQEX

GENMAB A/S

28-Mar-25

10:49:26 AM

24

1382.00

AQEU

GENMAB A/S

28-Mar-25

10:51:01 AM

27

1382.00

XCSE

GENMAB A/S

28-Mar-25

10:51:01 AM

19

1382.00

XCSE

GENMAB A/S

28-Mar-25

10:51:01 AM

14

1382.00

XCSE

GENMAB A/S

28-Mar-25

10:51:01 AM

41

1382.00

XCSE

GENMAB A/S

28-Mar-25

10:51:01 AM

4

1382.00

AQEU

GENMAB A/S

28-Mar-25

10:51:24 AM

77

1381.00

XCSE

GENMAB A/S

28-Mar-25

10:51:24 AM

59

1381.00

CEUX

GENMAB A/S

28-Mar-25

10:51:24 AM

15

1381.00

CEUX

GENMAB A/S

28-Mar-25

10:51:24 AM

23

1381.50

TQEX

GENMAB A/S

28-Mar-25

10:51:24 AM

24

1381.00

AQEU

GENMAB A/S

28-Mar-25

10:52:02 AM

76

1380.00

XCSE

GENMAB A/S

28-Mar-25

10:52:02 AM

13

1380.00

CEUX

GENMAB A/S

28-Mar-25

10:52:02 AM

25

1381.50

CEUX

GENMAB A/S

28-Mar-25

10:52:02 AM

66

1380.00

CEUX

GENMAB A/S

28-Mar-25

10:52:02 AM

2

1380.00

AQEU

147


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

10:52:10 AM

51

1381.50

CEUX

GENMAB A/S

28-Mar-25

10:54:31 AM

37

1382.50

XCSE

GENMAB A/S

28-Mar-25

10:54:31 AM

36

1382.50

XCSE

GENMAB A/S

28-Mar-25

10:54:31 AM

15

1382.50

CEUX

GENMAB A/S

28-Mar-25

10:54:31 AM

9

1382.50

CEUX

GENMAB A/S

28-Mar-25

10:54:31 AM

50

1382.50

CEUX

GENMAB A/S

28-Mar-25

10:57:47 AM

13

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:47 AM

41

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:47 AM

41

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:47 AM

11

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:47 AM

11

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:47 AM

12

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:48 AM

11

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:48 AM

12

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:48 AM

41

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:50 AM

41

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:50 AM

11

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:50 AM

41

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:50 AM

11

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:50 AM

38

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:50 AM

30

1383.00

XCSE

GENMAB A/S

28-Mar-25

10:57:50 AM

78

1382.50

CEUX

GENMAB A/S

28-Mar-25

10:57:50 AM

16

1382.00

AQEU

GENMAB A/S

28-Mar-25

10:58:09 AM

78

1382.00

XCSE

GENMAB A/S

28-Mar-25

10:58:09 AM

26

1382.00

TQEX

GENMAB A/S

28-Mar-25

10:58:09 AM

15

1382.00

AQEU

GENMAB A/S

28-Mar-25

10:59:21 AM

77

1381.00

XCSE

GENMAB A/S

28-Mar-25

10:59:21 AM

32

1381.50

CEUX

GENMAB A/S

28-Mar-25

10:59:21 AM

26

1381.50

CEUX

GENMAB A/S

28-Mar-25

10:59:21 AM

14

1381.00

AQEU

GENMAB A/S

28-Mar-25

10:59:21 AM

8

1381.00

AQEU

GENMAB A/S

28-Mar-25

11:00:37 AM

13

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:00:37 AM

18

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:00:37 AM

74

1380.50

CEUX

GENMAB A/S

28-Mar-25

11:00:37 AM

22

1380.50

TQEX

GENMAB A/S

28-Mar-25

11:00:57 AM

2

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:00:57 AM

14

1380.00

AQEU

GENMAB A/S

28-Mar-25

11:03:27 AM

22

1382.00

TQEX

GENMAB A/S

28-Mar-25

11:04:01 AM

40

1381.50

XCSE

GENMAB A/S

28-Mar-25

11:04:01 AM

40

1381.50

XCSE

GENMAB A/S

28-Mar-25

11:04:01 AM

75

1381.50

CEUX

GENMAB A/S

28-Mar-25

11:05:47 AM

4

1380.50

XCSE

GENMAB A/S

28-Mar-25

11:06:28 AM

37

1381.50

CEUX

GENMAB A/S

28-Mar-25

11:06:28 AM

11

1381.50

CEUX

GENMAB A/S

28-Mar-25

11:06:28 AM

10

1381.50

CEUX

148


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

11:06:51 AM

22

1381.00

TQEX

GENMAB A/S

28-Mar-25

11:06:51 AM

15

1381.00

AQEU

GENMAB A/S

28-Mar-25

11:06:52 AM

72

1380.50

XCSE

GENMAB A/S

28-Mar-25

11:06:52 AM

19

1381.00

AQEU

GENMAB A/S

28-Mar-25

11:07:11 AM

8

1381.50

CEUX

GENMAB A/S

28-Mar-25

11:07:11 AM

3

1381.50

CEUX

GENMAB A/S

28-Mar-25

11:09:59 AM

8

1382.50

CEUX

GENMAB A/S

28-Mar-25

11:10:09 AM

71

1382.50

CEUX

GENMAB A/S

28-Mar-25

11:10:09 AM

15

1382.50

CEUX

GENMAB A/S

28-Mar-25

11:11:49 AM

41

1382.50

XCSE

GENMAB A/S

28-Mar-25

11:11:49 AM

1

1382.50

XCSE

GENMAB A/S

28-Mar-25

11:11:51 AM

20

1382.00

XCSE

GENMAB A/S

28-Mar-25

11:13:00 AM

59

1382.00

XCSE

GENMAB A/S

28-Mar-25

11:13:04 AM

31

1382.00

TQEX

GENMAB A/S

28-Mar-25

11:13:07 AM

23

1382.00

CEUX

GENMAB A/S

28-Mar-25

11:13:07 AM

25

1382.00

AQEU

GENMAB A/S

28-Mar-25

11:13:11 AM

12

1382.00

XCSE

GENMAB A/S

28-Mar-25

11:13:11 AM

32

1382.00

CEUX

GENMAB A/S

28-Mar-25

11:13:11 AM

73

1382.50

CEUX

GENMAB A/S

28-Mar-25

11:13:11 AM

28

1382.50

CEUX

GENMAB A/S

28-Mar-25

11:13:11 AM

1

1382.00

TQEX

GENMAB A/S

28-Mar-25

11:13:11 AM

34

1382.00

TQEX

GENMAB A/S

28-Mar-25

11:13:19 AM

101

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:19 AM

78

1381.50

XCSE

GENMAB A/S

28-Mar-25

11:13:19 AM

65

1381.50

CEUX

GENMAB A/S

28-Mar-25

11:13:19 AM

23

1381.00

TQEX

GENMAB A/S

28-Mar-25

11:13:19 AM

6

1381.00

AQEU

GENMAB A/S

28-Mar-25

11:13:19 AM

20

1381.00

AQEU

GENMAB A/S

28-Mar-25

11:13:20 AM

101

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:20 AM

42

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:20 AM

101

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:20 AM

59

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:20 AM

9

1380.50

CEUX

GENMAB A/S

28-Mar-25

11:13:21 AM

101

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:21 AM

101

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:22 AM

9

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:22 AM

92

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:22 AM

101

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:23 AM

3

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:23 AM

62

1381.00

XCSE

GENMAB A/S

28-Mar-25

11:13:32 AM

77

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:13:32 AM

80

1380.50

XCSE

GENMAB A/S

28-Mar-25

11:13:32 AM

34

1380.50

CEUX

GENMAB A/S

28-Mar-25

11:13:32 AM

33

1380.50

CEUX

GENMAB A/S

28-Mar-25

11:13:32 AM

8

1380.00

AQEU

149


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

11:13:43 AM

74

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:13:43 AM

20

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:13:43 AM

57

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:13:45 AM

22

1378.50

AQEU

GENMAB A/S

28-Mar-25

11:14:23 AM

10

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:14:23 AM

69

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:15:58 AM

20

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:16:00 AM

17

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:16:21 AM

1

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:16:21 AM

13

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:16:38 AM

16

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:16:51 AM

41

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:16:51 AM

11

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:16:51 AM

12

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:17:17 AM

75

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:18:20 AM

17

1377.50

AQEU

GENMAB A/S

28-Mar-25

11:18:26 AM

59

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:18:26 AM

30

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:18:26 AM

5

1377.50

AQEU

GENMAB A/S

28-Mar-25

11:18:45 AM

25

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:18:45 AM

3

1377.50

TQEX

GENMAB A/S

28-Mar-25

11:18:53 AM

53

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:18:53 AM

19

1377.50

TQEX

GENMAB A/S

28-Mar-25

11:19:04 AM

45

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:19:04 AM

15

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:20:00 AM

21

1376.50

TQEX

GENMAB A/S

28-Mar-25

11:20:01 AM

9

1377.00

XCSE

GENMAB A/S

28-Mar-25

11:20:01 AM

61

1377.00

XCSE

GENMAB A/S

28-Mar-25

11:21:14 AM

3

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:21:15 AM

18

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:21:15 AM

41

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:21:15 AM

13

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:21:39 AM

25

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:21:39 AM

8

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:21:39 AM

38

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:23:33 AM

52

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:23:33 AM

49

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:23:33 AM

11

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:23:33 AM

20

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:23:52 AM

41

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:23:52 AM

13

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:23:52 AM

13

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:23:53 AM

11

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:23:53 AM

33

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:23:53 AM

26

1378.50

XCSE

150


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

11:24:37 AM

45

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:25:57 AM

35

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:25:57 AM

36

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:25:58 AM

1

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:26:42 AM

41

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:26:42 AM

41

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:26:42 AM

11

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:26:42 AM

31

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:28:06 AM

76

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:28:06 AM

41

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:28:06 AM

14

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:28:06 AM

66

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:28:06 AM

32

1378.50

TQEX

GENMAB A/S

28-Mar-25

11:28:06 AM

39

1378.50

AQEU

GENMAB A/S

28-Mar-25

11:28:47 AM

27

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:29:08 AM

34

1379.50

TQEX

GENMAB A/S

28-Mar-25

11:29:18 AM

36

1379.50

CEUX

GENMAB A/S

28-Mar-25

11:30:28 AM

75

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:30:28 AM

28

1379.00

AQEU

GENMAB A/S

28-Mar-25

11:30:30 AM

41

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:30:30 AM

23

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:30:30 AM

1

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:31:58 AM

10

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:31:58 AM

7

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:31:58 AM

5

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:31:59 AM

1

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:31:59 AM

33

1378.50

TQEX

GENMAB A/S

28-Mar-25

11:32:00 AM

77

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:32:00 AM

5

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:32:00 AM

44

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:32:00 AM

30

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:32:00 AM

22

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:32:58 AM

26

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:32:58 AM

44

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:33:21 AM

14

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:33:22 AM

41

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:33:22 AM

11

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:33:27 AM

26

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:34:17 AM

52

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:34:46 AM

15

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:34:46 AM

25

1379.00

TQEX

GENMAB A/S

28-Mar-25

11:35:08 AM

68

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:35:08 AM

11

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:35:08 AM

32

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:35:10 AM

41

1379.00

XCSE

151


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

11:35:52 AM

11

1379.00

XCSE

GENMAB A/S

28-Mar-25

11:36:37 AM

24

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:36:37 AM

36

1379.00

CEUX

GENMAB A/S

28-Mar-25

11:36:47 AM

41

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:47 AM

31

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:47 AM

13

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:47 AM

12

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:47 AM

17

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:47 AM

12

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:47 AM

41

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:48 AM

27

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:48 AM

41

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:48 AM

30

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:48 AM

13

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:48 AM

41

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:48 AM

19

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:36:48 AM

11

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:37:21 AM

13

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:37:21 AM

37

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:37:55 AM

10

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:37:55 AM

12

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:37:55 AM

13

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:38:19 AM

9

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:38:19 AM

13

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:38:43 AM

12

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:38:43 AM

41

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:38:43 AM

31

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:38:50 AM

16

1379.50

CEUX

GENMAB A/S

28-Mar-25

11:38:57 AM

34

1379.50

CEUX

GENMAB A/S

28-Mar-25

11:39:03 AM

32

1379.50

CEUX

GENMAB A/S

28-Mar-25

11:39:16 AM

32

1379.50

CEUX

GENMAB A/S

28-Mar-25

11:40:12 AM

26

1379.50

CEUX

GENMAB A/S

28-Mar-25

11:40:22 AM

44

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:40:22 AM

77

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:40:22 AM

50

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:40:22 AM

10

1379.50

CEUX

GENMAB A/S

28-Mar-25

11:40:22 AM

69

1379.50

CEUX

GENMAB A/S

28-Mar-25

11:40:22 AM

39

1379.50

TQEX

GENMAB A/S

28-Mar-25

11:42:16 AM

5

1380.50

XCSE

GENMAB A/S

28-Mar-25

11:42:16 AM

80

1381.00

CEUX

GENMAB A/S

28-Mar-25

11:44:27 AM

18

1380.50

XCSE

GENMAB A/S

28-Mar-25

11:44:27 AM

73

1380.50

XCSE

GENMAB A/S

28-Mar-25

11:44:27 AM

22

1380.50

TQEX

GENMAB A/S

28-Mar-25

11:44:27 AM

22

1380.50

AQEU

GENMAB A/S

28-Mar-25

11:44:28 AM

43

1380.50

XCSE

152


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

11:44:38 AM

3

1380.50

CEUX

GENMAB A/S

28-Mar-25

11:44:38 AM

53

1380.50

CEUX

GENMAB A/S

28-Mar-25

11:45:05 AM

59

1380.00

CEUX

GENMAB A/S

28-Mar-25

11:45:05 AM

20

1380.00

CEUX

GENMAB A/S

28-Mar-25

11:45:37 AM

22

1380.00

XCSE

GENMAB A/S

28-Mar-25

11:45:37 AM

1

1380.00

XCSE

GENMAB A/S

28-Mar-25

11:46:46 AM

12

1380.00

AQEU

GENMAB A/S

28-Mar-25

11:47:13 AM

25

1380.00

AQEU

GENMAB A/S

28-Mar-25

11:47:21 AM

79

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:47:34 AM

24

1379.50

TQEX

GENMAB A/S

28-Mar-25

11:47:44 AM

23

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:47:44 AM

11

1379.50

XCSE

GENMAB A/S

28-Mar-25

11:47:55 AM

14

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:48:30 AM

14

1378.50

TQEX

GENMAB A/S

28-Mar-25

11:48:47 AM

58

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:49:57 AM

22

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:52:34 AM

21

1378.50

XCSE

GENMAB A/S

28-Mar-25

11:52:34 AM

28

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:52:35 AM

14

1378.50

CEUX

GENMAB A/S

28-Mar-25

11:52:35 AM

8

1378.50

TQEX

GENMAB A/S

28-Mar-25

11:54:27 AM

74

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:54:27 AM

36

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:54:27 AM

23

1377.50

TQEX

GENMAB A/S

28-Mar-25

11:54:28 AM

8

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:54:28 AM

31

1377.00

XCSE

GENMAB A/S

28-Mar-25

11:54:28 AM

36

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:54:29 AM

26

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:54:29 AM

43

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:54:29 AM

1

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:54:29 AM

53

1377.50

XCSE

GENMAB A/S

28-Mar-25

11:56:17 AM

12

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:56:17 AM

14

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:56:51 AM

16

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:56:51 AM

17

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:56:51 AM

12

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:56:51 AM

30

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:56:52 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:56:52 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:56:53 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:56:57 AM

13

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:56:59 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:00 AM

13

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:10 AM

13

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:15 AM

37

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:15 AM

13

1378.00

XCSE

153


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

11:57:15 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:15 AM

13

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:15 AM

37

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:15 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:15 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:15 AM

13

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:16 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:16 AM

37

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:16 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:16 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:16 AM

13

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:16 AM

37

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:16 AM

14

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:57:17 AM

37

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:17 AM

30

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:17 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:17 AM

37

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:17 AM

13

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:17 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:18 AM

37

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:18 AM

13

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:18 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:18 AM

35

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:57:29 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:29 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:55 AM

31

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:55 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:56 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:56 AM

11

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:56 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:56 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:56 AM

12

1377.50

CEUX

GENMAB A/S

28-Mar-25

11:57:57 AM

12

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:57:59 AM

7

1378.00

XCSE

GENMAB A/S

28-Mar-25

11:59:40 AM

46

1377.00

XCSE

GENMAB A/S

28-Mar-25

11:59:40 AM

79

1378.00

CEUX

GENMAB A/S

28-Mar-25

11:59:46 AM

6

1378.00

CEUX

GENMAB A/S

28-Mar-25

12:02:27 PM

20

1377.50

CEUX

GENMAB A/S

28-Mar-25

12:02:28 PM

44

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:28 PM

1

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

14

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

41

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

10

1376.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

13

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

15

1376.50

XCSE

154


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

12:02:46 PM

9

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

13

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

12

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

9

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

79

1376.00

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

41

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

4

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

30

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

16

1377.50

XCSE

GENMAB A/S

28-Mar-25

12:02:46 PM

36

1377.50

CEUX

GENMAB A/S

28-Mar-25

12:02:46 PM

20

1377.00

CEUX

GENMAB A/S

28-Mar-25

12:02:46 PM

44

1376.50

CEUX

GENMAB A/S

28-Mar-25

12:02:46 PM

34

1376.50

CEUX

GENMAB A/S

28-Mar-25

12:02:46 PM

5

1377.00

CEUX

GENMAB A/S

28-Mar-25

12:02:46 PM

5

1377.00

CEUX

GENMAB A/S

28-Mar-25

12:02:46 PM

11

1376.50

TQEX

GENMAB A/S

28-Mar-25

12:02:46 PM

15

1376.50

TQEX

GENMAB A/S

28-Mar-25

12:02:47 PM

18

1376.00

XCSE

GENMAB A/S

28-Mar-25

12:02:47 PM

19

1375.50

CEUX

GENMAB A/S

28-Mar-25

12:02:55 PM

33

1375.50

CEUX

GENMAB A/S

28-Mar-25

12:02:55 PM

22

1375.50

CEUX

GENMAB A/S

28-Mar-25

12:03:35 PM

41

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:03:35 PM

78

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:03:35 PM

15

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:03:35 PM

12

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:03:35 PM

28

1375.00

TQEX

GENMAB A/S

28-Mar-25

12:03:37 PM

23

1374.50

CEUX

GENMAB A/S

28-Mar-25

12:03:37 PM

54

1374.50

CEUX

GENMAB A/S

28-Mar-25

12:03:38 PM

35

1374.50

XCSE

GENMAB A/S

28-Mar-25

12:03:38 PM

33

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:03:38 PM

43

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:03:38 PM

44

1374.50

XCSE

GENMAB A/S

28-Mar-25

12:03:38 PM

27

1374.00

TQEX

GENMAB A/S

28-Mar-25

12:06:43 PM

77

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:08:25 PM

23

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:09:07 PM

55

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:09:13 PM

30

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:09:13 PM

29

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:09:37 PM

50

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:10:46 PM

10

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:10:46 PM

20

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:10:46 PM

34

1375.00

CEUX

GENMAB A/S

28-Mar-25

12:11:17 PM

14

1375.00

CEUX

GENMAB A/S

28-Mar-25

12:11:45 PM

29

1375.00

CEUX

GENMAB A/S

28-Mar-25

12:11:58 PM

32

1375.00

TQEX

155


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

12:12:10 PM

2

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:10 PM

25

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:10 PM

41

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:10 PM

8

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:10 PM

3

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:10 PM

30

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:12 PM

4

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:12 PM

13

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:47 PM

23

1374.50

AQEU

GENMAB A/S

28-Mar-25

12:12:48 PM

32

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:48 PM

11

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:48 PM

39

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:48 PM

11

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:48 PM

15

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:12:49 PM

13

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:49 PM

12

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:49 PM

41

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:49 PM

11

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:49 PM

13

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:49 PM

32

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:50 PM

11

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:50 PM

10

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:50 PM

13

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:50 PM

13

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:50 PM

13

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:51 PM

5

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:51 PM

12

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:12:51 PM

28

1375.00

XCSE

GENMAB A/S

28-Mar-25

12:13:03 PM

16

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:13:03 PM

58

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:13:03 PM

75

1373.50

XCSE

GENMAB A/S

28-Mar-25

12:13:03 PM

61

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:13:03 PM

10

1372.00

CEUX

GENMAB A/S

28-Mar-25

12:13:03 PM

70

1372.00

CEUX

GENMAB A/S

28-Mar-25

12:13:03 PM

79

1373.00

CEUX

GENMAB A/S

28-Mar-25

12:13:03 PM

27

1372.50

TQEX

GENMAB A/S

28-Mar-25

12:13:03 PM

3

1372.50

TQEX

GENMAB A/S

28-Mar-25

12:13:03 PM

22

1373.50

TQEX

GENMAB A/S

28-Mar-25

12:13:03 PM

23

1373.50

AQEU

GENMAB A/S

28-Mar-25

12:13:03 PM

18

1372.00

AQEU

GENMAB A/S

28-Mar-25

12:13:03 PM

4

1372.00

AQEU

GENMAB A/S

28-Mar-25

12:13:04 PM

15

1371.50

XCSE

GENMAB A/S

28-Mar-25

12:13:04 PM

18

1371.50

XCSE

GENMAB A/S

28-Mar-25

12:13:18 PM

44

1371.50

XCSE

GENMAB A/S

28-Mar-25

12:13:18 PM

24

1371.50

TQEX

156


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

12:14:23 PM

3

1371.50

TQEX

GENMAB A/S

28-Mar-25

12:18:22 PM

44

1371.50

CEUX

GENMAB A/S

28-Mar-25

12:18:47 PM

5

1371.50

XCSE

GENMAB A/S

28-Mar-25

12:18:47 PM

11

1371.00

XCSE

GENMAB A/S

28-Mar-25

12:18:47 PM

12

1371.50

XCSE

GENMAB A/S

28-Mar-25

12:18:47 PM

30

1371.00

XCSE

GENMAB A/S

28-Mar-25

12:18:47 PM

30

1371.50

XCSE

GENMAB A/S

28-Mar-25

12:18:47 PM

35

1371.00

XCSE

GENMAB A/S

28-Mar-25

12:18:47 PM

12

1371.00

XCSE

GENMAB A/S

28-Mar-25

12:18:47 PM

24

1371.50

XCSE

GENMAB A/S

28-Mar-25

12:18:47 PM

43

1371.00

XCSE

GENMAB A/S

28-Mar-25

12:18:48 PM

74

1370.50

XCSE

GENMAB A/S

28-Mar-25

12:18:48 PM

74

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:18:48 PM

6

1369.00

CEUX

GENMAB A/S

28-Mar-25

12:18:48 PM

77

1370.50

CEUX

GENMAB A/S

28-Mar-25

12:18:48 PM

55

1369.00

CEUX

GENMAB A/S

28-Mar-25

12:18:48 PM

31

1370.50

TQEX

GENMAB A/S

28-Mar-25

12:19:10 PM

8

1368.50

XCSE

GENMAB A/S

28-Mar-25

12:19:10 PM

60

1368.50

XCSE

GENMAB A/S

28-Mar-25

12:20:42 PM

75

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:24:21 PM

53

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:24:21 PM

1

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:24:21 PM

6

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:24:21 PM

9

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:25:21 PM

11

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:25:21 PM

19

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:25:21 PM

13

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:26:10 PM

11

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:26:10 PM

22

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:26:57 PM

42

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:32:27 PM

1

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:32:27 PM

53

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:32:27 PM

16

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:32:27 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:32:28 PM

11

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:32:39 PM

12

1372.50

CEUX

GENMAB A/S

28-Mar-25

12:32:39 PM

48

1372.50

CEUX

GENMAB A/S

28-Mar-25

12:32:39 PM

39

1372.50

CEUX

GENMAB A/S

28-Mar-25

12:32:53 PM

12

1373.00

CEUX

GENMAB A/S

28-Mar-25

12:32:53 PM

46

1373.00

CEUX

GENMAB A/S

28-Mar-25

12:32:53 PM

43

1373.00

CEUX

GENMAB A/S

28-Mar-25

12:34:17 PM

32

1372.00

XCSE

GENMAB A/S

28-Mar-25

12:34:17 PM

77

1372.50

CEUX

GENMAB A/S

28-Mar-25

12:34:17 PM

14

1372.50

TQEX

GENMAB A/S

28-Mar-25

12:34:17 PM

25

1372.50

TQEX

157


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

12:34:44 PM

15

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:34:44 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:33 PM

42

1372.00

XCSE

GENMAB A/S

28-Mar-25

12:35:33 PM

22

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:33 PM

30

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:33 PM

50

1372.00

XCSE

GENMAB A/S

28-Mar-25

12:35:33 PM

32

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:33 PM

30

1372.00

XCSE

GENMAB A/S

28-Mar-25

12:35:33 PM

21

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:33 PM

16

1372.00

XCSE

GENMAB A/S

28-Mar-25

12:35:33 PM

4

1372.00

AQEU

GENMAB A/S

28-Mar-25

12:35:34 PM

2

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:34 PM

8

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:34 PM

12

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:34 PM

11

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:34 PM

1

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:35 PM

12

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:35 PM

11

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:35 PM

30

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:35 PM

30

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:36 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:36 PM

2

1372.00

XCSE

GENMAB A/S

28-Mar-25

12:35:36 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:36 PM

37

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:35:36 PM

30

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:36:27 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:36:27 PM

42

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:36:27 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:36:27 PM

32

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:37:11 PM

11

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:37:11 PM

11

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:37:11 PM

32

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:38:00 PM

2

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:38:24 PM

96

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:38:28 PM

4

1372.50

CEUX

GENMAB A/S

28-Mar-25

12:38:28 PM

59

1372.50

CEUX

GENMAB A/S

28-Mar-25

12:38:32 PM

10

1372.50

CEUX

GENMAB A/S

28-Mar-25

12:39:21 PM

74

1372.50

XCSE

GENMAB A/S

28-Mar-25

12:39:21 PM

1

1373.00

CEUX

GENMAB A/S

28-Mar-25

12:41:44 PM

25

1374.50

CEUX

GENMAB A/S

28-Mar-25

12:41:44 PM

5

1374.50

CEUX

GENMAB A/S

28-Mar-25

12:41:44 PM

70

1374.50

CEUX

GENMAB A/S

28-Mar-25

12:41:44 PM

44

1374.50

TQEX

GENMAB A/S

28-Mar-25

12:41:44 PM

22

1374.50

AQEU

GENMAB A/S

28-Mar-25

12:41:45 PM

1

1374.50

XCSE

158


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

12:41:45 PM

1

1374.50

CEUX

GENMAB A/S

28-Mar-25

12:42:28 PM

36

1374.50

CEUX

GENMAB A/S

28-Mar-25

12:43:00 PM

10

1374.50

CEUX

GENMAB A/S

28-Mar-25

12:45:47 PM

78

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:48:15 PM

1

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:48:15 PM

36

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:48:17 PM

6

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:48:28 PM

5

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:48:35 PM

10

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:48:37 PM

35

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:48:37 PM

25

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:48:37 PM

10

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:48:37 PM

13

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:48:37 PM

3

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:48:38 PM

1

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:50:00 PM

10

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:50:30 PM

5

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:50:30 PM

5

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:50:43 PM

1

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:51:00 PM

10

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:51:18 PM

6

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:51:18 PM

6

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:51:18 PM

5

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:51:45 PM

6

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:51:45 PM

6

1373.50

CEUX

GENMAB A/S

28-Mar-25

12:51:45 PM

6

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:51:45 PM

6

1374.00

CEUX

GENMAB A/S

28-Mar-25

12:51:52 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:52 PM

41

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:52 PM

13

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:53 PM

12

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:53 PM

13

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:54 PM

7

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:54 PM

12

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:54 PM

12

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:55 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:55 PM

10

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:55 PM

30

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:55 PM

13

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:56 PM

30

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:56 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:56 PM

13

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:59 PM

74

1373.00

XCSE

GENMAB A/S

28-Mar-25

12:51:59 PM

16

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:59 PM

30

1374.00

XCSE

159


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

12:51:59 PM

42

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:59 PM

13

1374.00

XCSE

GENMAB A/S

28-Mar-25

12:51:59 PM

70

1373.50

CEUX

GENMAB A/S

28-Mar-25

12:51:59 PM

35

1373.50

CEUX

GENMAB A/S

28-Mar-25

12:51:59 PM

36

1373.50

CEUX

GENMAB A/S

28-Mar-25

12:51:59 PM

30

1373.50

CEUX

GENMAB A/S

28-Mar-25

12:51:59 PM

45

1373.50

TQEX

GENMAB A/S

28-Mar-25

12:51:59 PM

25

1373.00

AQEU

GENMAB A/S

28-Mar-25

12:52:00 PM

49

1373.00

XCSE

GENMAB A/S

28-Mar-25

12:52:00 PM

11

1373.00

XCSE

GENMAB A/S

28-Mar-25

12:52:00 PM

36

1373.00

CEUX

GENMAB A/S

28-Mar-25

12:52:00 PM

6

1373.00

CEUX

GENMAB A/S

28-Mar-25

12:52:00 PM

6

1373.00

CEUX

GENMAB A/S

28-Mar-25

12:52:00 PM

34

1373.50

CEUX

GENMAB A/S

28-Mar-25

12:52:02 PM

3

1373.00

XCSE

GENMAB A/S

28-Mar-25

12:52:02 PM

42

1373.00

XCSE

GENMAB A/S

28-Mar-25

12:52:04 PM

2

1373.00

XCSE

GENMAB A/S

28-Mar-25

12:52:04 PM

30

1373.00

XCSE

GENMAB A/S

28-Mar-25

12:52:04 PM

42

1373.00

XCSE

GENMAB A/S

28-Mar-25

12:52:14 PM

77

1372.00

XCSE

GENMAB A/S

28-Mar-25

12:52:14 PM

101

1372.00

XCSE

GENMAB A/S

28-Mar-25

12:52:14 PM

79

1372.50

CEUX

GENMAB A/S

28-Mar-25

12:52:14 PM

37

1372.50

TQEX

GENMAB A/S

28-Mar-25

12:52:14 PM

19

1372.00

AQEU

GENMAB A/S

28-Mar-25

12:52:33 PM

76

1370.50

XCSE

GENMAB A/S

28-Mar-25

12:52:33 PM

45

1371.00

CEUX

GENMAB A/S

28-Mar-25

12:52:33 PM

34

1371.00

CEUX

GENMAB A/S

28-Mar-25

12:52:33 PM

32

1371.00

TQEX

GENMAB A/S

28-Mar-25

12:52:36 PM

79

1370.00

CEUX

GENMAB A/S

28-Mar-25

12:52:36 PM

42

1370.00

TQEX

GENMAB A/S

28-Mar-25

12:52:36 PM

28

1370.00

AQEU

GENMAB A/S

28-Mar-25

12:52:38 PM

46

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:52:38 PM

30

1369.50

XCSE

GENMAB A/S

28-Mar-25

12:54:59 PM

34

1370.00

CEUX

GENMAB A/S

28-Mar-25

12:54:59 PM

26

1370.00

CEUX

GENMAB A/S

28-Mar-25

12:55:00 PM

30

1370.00

XCSE

GENMAB A/S

28-Mar-25

12:55:00 PM

8

1370.00

XCSE

GENMAB A/S

28-Mar-25

12:55:00 PM

9

1370.00

XCSE

GENMAB A/S

28-Mar-25

12:55:00 PM

3

1370.00

CEUX

GENMAB A/S

28-Mar-25

12:55:00 PM

15

1370.00

CEUX

GENMAB A/S

28-Mar-25

12:55:00 PM

16

1370.00

TQEX

GENMAB A/S

28-Mar-25

12:57:17 PM

79

1370.00

XCSE

GENMAB A/S

28-Mar-25

12:57:17 PM

1

1370.00

XCSE

GENMAB A/S

28-Mar-25

12:57:17 PM

9

1370.00

XCSE

GENMAB A/S

28-Mar-25

12:57:17 PM

42

1370.00

XCSE

160


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

12:57:17 PM

10

1370.00

TQEX

GENMAB A/S

28-Mar-25

12:57:45 PM

26

1371.00

XCSE

GENMAB A/S

28-Mar-25

12:57:45 PM

10

1371.00

XCSE

GENMAB A/S

28-Mar-25

12:57:46 PM

11

1371.00

XCSE

GENMAB A/S

28-Mar-25

12:57:48 PM

58

1371.00

XCSE

GENMAB A/S

28-Mar-25

1:00:07 PM

78

1370.00

CEUX

GENMAB A/S

28-Mar-25

1:01:17 PM

72

1369.50

XCSE

GENMAB A/S

28-Mar-25

1:02:46 PM

42

1369.50

XCSE

GENMAB A/S

28-Mar-25

1:02:46 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

1:02:46 PM

4

1369.50

XCSE

GENMAB A/S

28-Mar-25

1:02:46 PM

44

1369.50

XCSE

GENMAB A/S

28-Mar-25

1:02:46 PM

35

1369.50

AQEU

GENMAB A/S

28-Mar-25

1:05:17 PM

12

1369.50

CEUX

GENMAB A/S

28-Mar-25

1:05:18 PM

33

1369.50

CEUX

GENMAB A/S

28-Mar-25

1:05:18 PM

38

1369.50

CEUX

GENMAB A/S

28-Mar-25

1:05:29 PM

6

1369.00

CEUX

GENMAB A/S

28-Mar-25

1:05:43 PM

32

1369.00

CEUX

GENMAB A/S

28-Mar-25

1:06:13 PM

32

1369.00

CEUX

GENMAB A/S

28-Mar-25

1:06:35 PM

11

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:06:35 PM

42

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:06:35 PM

5

1369.00

CEUX

GENMAB A/S

28-Mar-25

1:06:35 PM

16

1369.00

TQEX

GENMAB A/S

28-Mar-25

1:06:35 PM

6

1369.00

TQEX

GENMAB A/S

28-Mar-25

1:06:36 PM

15

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:06:36 PM

19

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:06:36 PM

42

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

9

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

12

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

25

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

32

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

42

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

16

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

11

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

7

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

6

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

6

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

78

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

11

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

42

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

18

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:16 PM

3

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:37 PM

32

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:07:38 PM

33

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:38 PM

4

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:51 PM

12

1369.00

XCSE

161


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

1:07:51 PM

13

1369.00

XCSE

GENMAB A/S

28-Mar-25

1:07:54 PM

4

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:08:21 PM

42

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:08:21 PM

43

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:08:21 PM

13

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:08:21 PM

1

1368.50

XCSE

GENMAB A/S

28-Mar-25

1:08:38 PM

32

1368.50

CEUX

GENMAB A/S

28-Mar-25

1:08:57 PM

14

1368.00

TQEX

GENMAB A/S

28-Mar-25

1:08:57 PM

13

1368.00

TQEX

GENMAB A/S

28-Mar-25

1:09:28 PM

28

1368.00

CEUX

GENMAB A/S

28-Mar-25

1:09:28 PM

12

1368.00

CEUX

GENMAB A/S

28-Mar-25

1:09:28 PM

32

1368.00

CEUX

GENMAB A/S

28-Mar-25

1:09:28 PM

30

1368.00

CEUX

GENMAB A/S

28-Mar-25

1:11:19 PM

77

1367.50

XCSE

GENMAB A/S

28-Mar-25

1:11:19 PM

24

1367.50

XCSE

GENMAB A/S

28-Mar-25

1:11:19 PM

79

1367.50

CEUX

GENMAB A/S

28-Mar-25

1:14:17 PM

60

1367.00

XCSE

GENMAB A/S

28-Mar-25

1:14:17 PM

41

1367.00

XCSE

GENMAB A/S

28-Mar-25

1:14:17 PM

25

1367.00

TQEX

GENMAB A/S

28-Mar-25

1:16:27 PM

74

1367.00

XCSE

GENMAB A/S

28-Mar-25

1:16:28 PM

15

1367.00

XCSE

GENMAB A/S

28-Mar-25

1:16:28 PM

1

1367.00

XCSE

GENMAB A/S

28-Mar-25

1:16:28 PM

48

1367.00

XCSE

GENMAB A/S

28-Mar-25

1:16:28 PM

35

1366.50

CEUX

GENMAB A/S

28-Mar-25

1:16:31 PM

9

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:16:31 PM

48

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:16:31 PM

44

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:16:31 PM

79

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:16:31 PM

42

1366.50

CEUX

GENMAB A/S

28-Mar-25

1:16:58 PM

10

1368.00

CEUX

GENMAB A/S

28-Mar-25

1:17:18 PM

9

1368.00

XCSE

GENMAB A/S

28-Mar-25

1:17:18 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

1:17:18 PM

32

1368.00

CEUX

GENMAB A/S

28-Mar-25

1:17:39 PM

10

1368.00

XCSE

GENMAB A/S

28-Mar-25

1:17:39 PM

32

1368.00

XCSE

GENMAB A/S

28-Mar-25

1:17:39 PM

45

1367.50

XCSE

GENMAB A/S

28-Mar-25

1:17:39 PM

79

1368.00

XCSE

GENMAB A/S

28-Mar-25

1:17:39 PM

14

1367.50

XCSE

GENMAB A/S

28-Mar-25

1:17:39 PM

78

1367.50

CEUX

GENMAB A/S

28-Mar-25

1:17:39 PM

30

1367.50

TQEX

GENMAB A/S

28-Mar-25

1:17:40 PM

77

1367.00

XCSE

GENMAB A/S

28-Mar-25

1:17:41 PM

9

1366.50

CEUX

GENMAB A/S

28-Mar-25

1:18:47 PM

69

1366.50

CEUX

GENMAB A/S

28-Mar-25

1:18:47 PM

29

1366.50

TQEX

GENMAB A/S

28-Mar-25

1:20:10 PM

54

1366.50

CEUX

162


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

1:20:10 PM

22

1366.50

CEUX

GENMAB A/S

28-Mar-25

1:20:10 PM

22

1366.50

TQEX

GENMAB A/S

28-Mar-25

1:20:11 PM

75

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:20:11 PM

76

1365.50

CEUX

GENMAB A/S

28-Mar-25

1:20:11 PM

25

1366.00

AQEU

GENMAB A/S

28-Mar-25

1:20:13 PM

22

1365.00

AQEU

GENMAB A/S

28-Mar-25

1:23:39 PM

48

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:23:39 PM

30

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:23:39 PM

1

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:23:45 PM

8

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:24:35 PM

78

1365.00

CEUX

GENMAB A/S

28-Mar-25

1:24:35 PM

28

1365.00

TQEX

GENMAB A/S

28-Mar-25

1:24:40 PM

18

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:24:40 PM

25

1365.00

AQEU

GENMAB A/S

28-Mar-25

1:24:41 PM

20

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:24:42 PM

13

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:24:42 PM

48

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:25:08 PM

48

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:25:08 PM

1

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:25:08 PM

12

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:25:08 PM

13

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:25:19 PM

79

1364.50

XCSE

GENMAB A/S

28-Mar-25

1:26:26 PM

13

1364.50

XCSE

GENMAB A/S

28-Mar-25

1:26:26 PM

9

1364.50

XCSE

GENMAB A/S

28-Mar-25

1:26:31 PM

31

1364.50

XCSE

GENMAB A/S

28-Mar-25

1:26:51 PM

1

1364.50

XCSE

GENMAB A/S

28-Mar-25

1:26:51 PM

4

1364.50

XCSE

GENMAB A/S

28-Mar-25

1:27:46 PM

20

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:27:46 PM

34

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:27:46 PM

11

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:27:46 PM

24

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:27:46 PM

12

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:27:50 PM

31

1364.00

CEUX

GENMAB A/S

28-Mar-25

1:27:50 PM

43

1364.00

CEUX

GENMAB A/S

28-Mar-25

1:27:52 PM

20

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:28:43 PM

34

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:28:43 PM

18

1363.50

TQEX

GENMAB A/S

28-Mar-25

1:28:43 PM

4

1363.50

TQEX

GENMAB A/S

28-Mar-25

1:30:26 PM

11

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:30:26 PM

1

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:30:27 PM

25

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:30:27 PM

46

1363.00

CEUX

GENMAB A/S

28-Mar-25

1:30:27 PM

32

1363.00

CEUX

GENMAB A/S

28-Mar-25

1:30:29 PM

1

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:30:37 PM

5

1362.50

XCSE

163


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

1:30:37 PM

45

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:30:37 PM

23

1362.00

TQEX

GENMAB A/S

28-Mar-25

1:30:37 PM

1

1362.00

TQEX

GENMAB A/S

28-Mar-25

1:30:53 PM

12

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:30:54 PM

11

1363.00

XCSE

GENMAB A/S

28-Mar-25

1:32:14 PM

27

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:32:19 PM

32

1363.00

TQEX

GENMAB A/S

28-Mar-25

1:32:25 PM

83

1363.00

XCSE

GENMAB A/S

28-Mar-25

1:32:25 PM

48

1363.00

XCSE

GENMAB A/S

28-Mar-25

1:32:26 PM

13

1363.00

XCSE

GENMAB A/S

28-Mar-25

1:34:03 PM

12

1362.00

XCSE

GENMAB A/S

28-Mar-25

1:34:03 PM

47

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:34:03 PM

41

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:34:03 PM

48

1362.00

XCSE

GENMAB A/S

28-Mar-25

1:34:03 PM

11

1361.50

CEUX

GENMAB A/S

28-Mar-25

1:34:03 PM

75

1362.50

CEUX

GENMAB A/S

28-Mar-25

1:34:03 PM

12

1361.50

CEUX

GENMAB A/S

28-Mar-25

1:34:31 PM

9

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:34:31 PM

13

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:34:41 PM

13

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:34:41 PM

12

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:34:41 PM

8

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:35:28 PM

14

1362.00

CEUX

GENMAB A/S

28-Mar-25

1:37:08 PM

13

1361.50

XCSE

GENMAB A/S

28-Mar-25

1:37:08 PM

48

1361.50

XCSE

GENMAB A/S

28-Mar-25

1:37:08 PM

76

1361.50

XCSE

GENMAB A/S

28-Mar-25

1:37:08 PM

11

1361.50

XCSE

GENMAB A/S

28-Mar-25

1:37:08 PM

18

1361.50

CEUX

GENMAB A/S

28-Mar-25

1:37:08 PM

34

1361.50

CEUX

GENMAB A/S

28-Mar-25

1:37:08 PM

24

1360.50

TQEX

GENMAB A/S

28-Mar-25

1:37:09 PM

12

1361.50

CEUX

GENMAB A/S

28-Mar-25

1:37:23 PM

13

1361.50

XCSE

GENMAB A/S

28-Mar-25

1:37:23 PM

11

1361.50

XCSE

GENMAB A/S

28-Mar-25

1:37:23 PM

11

1361.50

XCSE

GENMAB A/S

28-Mar-25

1:37:23 PM

30

1361.50

CEUX

GENMAB A/S

28-Mar-25

1:37:23 PM

32

1361.50

CEUX

GENMAB A/S

28-Mar-25

1:37:46 PM

65

1362.00

XCSE

GENMAB A/S

28-Mar-25

1:37:46 PM

12

1362.00

XCSE

GENMAB A/S

28-Mar-25

1:37:46 PM

14

1362.00

AQEU

GENMAB A/S

28-Mar-25

1:37:46 PM

8

1362.00

AQEU

GENMAB A/S

28-Mar-25

1:38:53 PM

79

1362.00

XCSE

GENMAB A/S

28-Mar-25

1:38:53 PM

32

1361.00

XCSE

GENMAB A/S

28-Mar-25

1:38:53 PM

47

1361.00

XCSE

GENMAB A/S

28-Mar-25

1:38:53 PM

80

1361.50

CEUX

GENMAB A/S

28-Mar-25

1:38:53 PM

22

1362.00

TQEX

164


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

1:38:53 PM

23

1361.00

AQEU

GENMAB A/S

28-Mar-25

1:38:53 PM

28

1362.00

AQEU

GENMAB A/S

28-Mar-25

1:40:54 PM

12

1361.00

XCSE

GENMAB A/S

28-Mar-25

1:40:54 PM

36

1361.00

XCSE

GENMAB A/S

28-Mar-25

1:40:54 PM

13

1361.00

XCSE

GENMAB A/S

28-Mar-25

1:40:54 PM

1

1361.00

XCSE

GENMAB A/S

28-Mar-25

1:40:54 PM

39

1361.00

XCSE

GENMAB A/S

28-Mar-25

1:42:37 PM

23

1362.50

AQEU

GENMAB A/S

28-Mar-25

1:43:00 PM

34

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:43:00 PM

44

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:43:00 PM

25

1362.50

CEUX

GENMAB A/S

28-Mar-25

1:43:00 PM

12

1362.50

TQEX

GENMAB A/S

28-Mar-25

1:43:25 PM

29

1362.50

CEUX

GENMAB A/S

28-Mar-25

1:43:26 PM

13

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:43:26 PM

43

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:43:26 PM

7

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:43:26 PM

16

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:43:26 PM

10

1362.50

CEUX

GENMAB A/S

28-Mar-25

1:43:26 PM

22

1362.50

CEUX

GENMAB A/S

28-Mar-25

1:43:38 PM

26

1362.50

CEUX

GENMAB A/S

28-Mar-25

1:43:41 PM

12

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:43:41 PM

43

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:43:41 PM

6

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:44:18 PM

3

1362.50

CEUX

GENMAB A/S

28-Mar-25

1:44:18 PM

12

1362.50

CEUX

GENMAB A/S

28-Mar-25

1:44:18 PM

2

1362.50

CEUX

GENMAB A/S

28-Mar-25

1:44:25 PM

1

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:44:25 PM

2

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:44:25 PM

1

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:44:45 PM

12

1363.00

XCSE

GENMAB A/S

28-Mar-25

1:44:45 PM

8

1363.00

XCSE

GENMAB A/S

28-Mar-25

1:44:51 PM

10

1363.00

XCSE

GENMAB A/S

28-Mar-25

1:45:26 PM

5

1363.00

XCSE

GENMAB A/S

28-Mar-25

1:46:05 PM

31

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:05 PM

12

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:05 PM

13

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:05 PM

2

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:05 PM

9

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:06 PM

14

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:06 PM

8

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:06 PM

12

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:06 PM

1

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:06 PM

1

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:21 PM

11

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:21 PM

11

1363.50

XCSE

165


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

1:46:41 PM

12

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:41 PM

9

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:41 PM

13

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:46:53 PM

25

1362.50

XCSE

GENMAB A/S

28-Mar-25

1:47:16 PM

5

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:47:16 PM

11

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:47:16 PM

24

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:47:16 PM

6

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:47:16 PM

17

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:47:17 PM

22

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:47:17 PM

17

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:47:17 PM

8

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:47:21 PM

5

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:47:21 PM

41

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:47:38 PM

1

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:47:38 PM

23

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:48:25 PM

7

1363.50

XCSE

GENMAB A/S

28-Mar-25

1:48:25 PM

10

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:49:25 PM

25

1363.50

CEUX

GENMAB A/S

28-Mar-25

1:50:09 PM

34

1365.00

CEUX

GENMAB A/S

28-Mar-25

1:50:09 PM

15

1365.00

CEUX

GENMAB A/S

28-Mar-25

1:50:09 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

1:50:09 PM

23

1365.00

CEUX

GENMAB A/S

28-Mar-25

1:50:09 PM

13

1365.00

TQEX

GENMAB A/S

28-Mar-25

1:53:11 PM

34

1365.50

CEUX

GENMAB A/S

28-Mar-25

1:53:11 PM

1

1365.50

AQEU

GENMAB A/S

28-Mar-25

1:53:11 PM

21

1365.50

AQEU

GENMAB A/S

28-Mar-25

1:53:33 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:53:33 PM

15

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:53:33 PM

9

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:53:33 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:53:34 PM

7

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:54:00 PM

33

1366.00

TQEX

GENMAB A/S

28-Mar-25

1:54:12 PM

43

1365.50

CEUX

GENMAB A/S

28-Mar-25

1:54:14 PM

17

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:54:14 PM

42

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:54:14 PM

36

1366.00

CEUX

GENMAB A/S

28-Mar-25

1:54:14 PM

6

1366.00

CEUX

GENMAB A/S

28-Mar-25

1:54:14 PM

80

1366.00

CEUX

GENMAB A/S

28-Mar-25

1:54:15 PM

36

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:54:15 PM

14

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:54:26 PM

41

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:54:26 PM

23

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:54:26 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:54:26 PM

10

1366.00

XCSE

166


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

1:54:27 PM

26

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:54:27 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:55:00 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

1:55:00 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

1:55:00 PM

1

1366.50

XCSE

GENMAB A/S

28-Mar-25

1:55:00 PM

3

1366.50

XCSE

GENMAB A/S

28-Mar-25

1:55:00 PM

53

1366.50

XCSE

GENMAB A/S

28-Mar-25

1:55:00 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

1:55:00 PM

42

1366.50

XCSE

GENMAB A/S

28-Mar-25

1:55:19 PM

36

1366.00

CEUX

GENMAB A/S

28-Mar-25

1:55:31 PM

19

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:55:31 PM

44

1366.00

XCSE

GENMAB A/S

28-Mar-25

1:55:31 PM

24

1365.50

XCSE

GENMAB A/S

28-Mar-25

1:55:31 PM

51

1365.50

XCSE

GENMAB A/S

28-Mar-25

1:55:31 PM

43

1366.00

CEUX

GENMAB A/S

28-Mar-25

1:55:31 PM

79

1366.00

CEUX

GENMAB A/S

28-Mar-25

1:55:31 PM

3

1366.00

TQEX

GENMAB A/S

28-Mar-25

1:55:31 PM

33

1366.00

TQEX

GENMAB A/S

28-Mar-25

1:55:31 PM

29

1366.00

TQEX

GENMAB A/S

28-Mar-25

1:56:57 PM

36

1365.50

XCSE

GENMAB A/S

28-Mar-25

1:56:57 PM

13

1365.50

XCSE

GENMAB A/S

28-Mar-25

1:56:57 PM

13

1365.50

XCSE

GENMAB A/S

28-Mar-25

1:56:57 PM

5

1365.50

AQEU

GENMAB A/S

28-Mar-25

1:56:58 PM

100

1365.50

XCSE

GENMAB A/S

28-Mar-25

1:56:58 PM

14

1365.50

XCSE

GENMAB A/S

28-Mar-25

1:57:19 PM

80

1365.00

CEUX

GENMAB A/S

28-Mar-25

1:57:41 PM

8

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:57:41 PM

41

1365.00

XCSE

GENMAB A/S

28-Mar-25

1:58:46 PM

76

1364.50

XCSE

GENMAB A/S

28-Mar-25

1:58:46 PM

23

1365.00

TQEX

GENMAB A/S

28-Mar-25

1:58:46 PM

6

1364.50

AQEU

GENMAB A/S

28-Mar-25

1:58:48 PM

21

1365.50

AQEU

GENMAB A/S

28-Mar-25

2:00:55 PM

42

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:00:55 PM

1

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:00:55 PM

18

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:00:55 PM

30

1367.50

AQEU

GENMAB A/S

28-Mar-25

2:01:28 PM

40

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:01:28 PM

53

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:01:28 PM

8

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:01:45 PM

25

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:02:05 PM

42

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:02:05 PM

13

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:02:05 PM

30

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:02:36 PM

74

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:03:08 PM

11

1367.00

CEUX

167


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:03:08 PM

1

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:03:28 PM

10

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:03:28 PM

12

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:04:25 PM

32

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:04:35 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:04:35 PM

20

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:04:35 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:04:45 PM

20

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:04:45 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:04:45 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:04:45 PM

78

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:04:45 PM

27

1366.50

TQEX

GENMAB A/S

28-Mar-25

2:05:12 PM

30

1366.50

AQEU

GENMAB A/S

28-Mar-25

2:05:21 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:05:21 PM

31

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:05:51 PM

23

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:05:51 PM

1

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:05:51 PM

10

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:05:51 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:05:51 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:06:41 PM

75

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:06:41 PM

34

1365.00

XCSE

GENMAB A/S

28-Mar-25

2:06:41 PM

78

1365.00

XCSE

GENMAB A/S

28-Mar-25

2:06:41 PM

74

1365.50

CEUX

GENMAB A/S

28-Mar-25

2:06:41 PM

20

1364.00

CEUX

GENMAB A/S

28-Mar-25

2:06:41 PM

14

1364.00

CEUX

GENMAB A/S

28-Mar-25

2:06:41 PM

24

1365.50

TQEX

GENMAB A/S

28-Mar-25

2:06:41 PM

2

1365.00

TQEX

GENMAB A/S

28-Mar-25

2:06:41 PM

23

1365.00

AQEU

GENMAB A/S

28-Mar-25

2:06:41 PM

2

1364.00

AQEU

GENMAB A/S

28-Mar-25

2:06:41 PM

2

1366.50

AQEU

GENMAB A/S

28-Mar-25

2:06:41 PM

23

1365.50

AQEU

GENMAB A/S

28-Mar-25

2:06:41 PM

29

1364.00

AQEU

GENMAB A/S

28-Mar-25

2:07:46 PM

4

1364.00

CEUX

GENMAB A/S

28-Mar-25

2:08:37 PM

34

1366.00

CEUX

GENMAB A/S

28-Mar-25

2:08:37 PM

43

1366.00

CEUX

GENMAB A/S

28-Mar-25

2:09:47 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:09:47 PM

22

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:09:47 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:11:04 PM

72

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:11:04 PM

4

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:11:04 PM

29

1366.50

TQEX

GENMAB A/S

28-Mar-25

2:11:04 PM

29

1366.50

AQEU

GENMAB A/S

28-Mar-25

2:11:05 PM

44

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:11:31 PM

23

1367.00

XCSE

168


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:11:31 PM

1

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:11:31 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:11:31 PM

14

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:11:31 PM

24

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:11:32 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:11:32 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:11:32 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:11:32 PM

24

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:11:32 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:12:11 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:12:11 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:13:25 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:13:25 PM

32

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:13:58 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:13:58 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:13:58 PM

42

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:13:58 PM

2

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:13:58 PM

26

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:13:58 PM

75

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:13:58 PM

80

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:13:58 PM

23

1366.50

TQEX

GENMAB A/S

28-Mar-25

2:13:58 PM

29

1366.50

AQEU

GENMAB A/S

28-Mar-25

2:14:13 PM

20

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:14:13 PM

43

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:14:51 PM

47

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:15:25 PM

21

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:15:25 PM

1

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:15:41 PM

43

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:15:41 PM

6

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:15:41 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:16:00 PM

21

1366.00

CEUX

GENMAB A/S

28-Mar-25

2:16:00 PM

55

1366.00

CEUX

GENMAB A/S

28-Mar-25

2:16:25 PM

3

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:16:26 PM

14

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:16:47 PM

42

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:16:47 PM

11

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:16:47 PM

11

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:17:01 PM

74

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:17:04 PM

22

1366.50

TQEX

GENMAB A/S

28-Mar-25

2:17:28 PM

9

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:17:28 PM

56

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:17:28 PM

36

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:17:50 PM

26

1366.00

CEUX

GENMAB A/S

28-Mar-25

2:17:50 PM

52

1366.00

CEUX

GENMAB A/S

28-Mar-25

2:18:25 PM

11

1366.00

XCSE

169


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:18:25 PM

24

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:18:25 PM

42

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:18:27 PM

37

1365.00

XCSE

GENMAB A/S

28-Mar-25

2:18:27 PM

20

1364.50

XCSE

GENMAB A/S

28-Mar-25

2:18:27 PM

79

1365.50

XCSE

GENMAB A/S

28-Mar-25

2:18:27 PM

65

1365.00

CEUX

GENMAB A/S

28-Mar-25

2:18:27 PM

14

1365.00

CEUX

GENMAB A/S

28-Mar-25

2:18:27 PM

30

1365.00

TQEX

GENMAB A/S

28-Mar-25

2:18:27 PM

22

1365.50

AQEU

GENMAB A/S

28-Mar-25

2:18:37 PM

44

1364.50

XCSE

GENMAB A/S

28-Mar-25

2:18:37 PM

10

1364.50

XCSE

GENMAB A/S

28-Mar-25

2:18:37 PM

27

1364.50

AQEU

GENMAB A/S

28-Mar-25

2:18:39 PM

34

1364.00

CEUX

GENMAB A/S

28-Mar-25

2:19:09 PM

6

1364.00

CEUX

GENMAB A/S

28-Mar-25

2:19:16 PM

76

1363.50

XCSE

GENMAB A/S

28-Mar-25

2:19:16 PM

22

1363.50

TQEX

GENMAB A/S

28-Mar-25

2:22:27 PM

74

1365.50

XCSE

GENMAB A/S

28-Mar-25

2:23:25 PM

46

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:23:25 PM

34

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:23:43 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:23:43 PM

67

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:23:43 PM

78

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:23:43 PM

31

1367.00

TQEX

GENMAB A/S

28-Mar-25

2:23:43 PM

17

1367.00

AQEU

GENMAB A/S

28-Mar-25

2:23:43 PM

3

1367.00

AQEU

GENMAB A/S

28-Mar-25

2:23:43 PM

7

1367.00

AQEU

GENMAB A/S

28-Mar-25

2:24:00 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:24:30 PM

14

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:24:30 PM

30

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:24:30 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:25:26 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:25:48 PM

12

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:25:48 PM

10

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:25:48 PM

5

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:25:48 PM

29

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:26:17 PM

79

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:26:23 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:26:23 PM

14

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:27:50 PM

32

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:27:50 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:27:50 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:27:50 PM

5

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:27:50 PM

29

1367.50

CEUX

GENMAB A/S

28-Mar-25

2:27:50 PM

37

1367.50

CEUX

GENMAB A/S

28-Mar-25

2:27:50 PM

30

1367.50

CEUX

170


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:27:50 PM

41

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:27:50 PM

5

1367.50

CEUX

GENMAB A/S

28-Mar-25

2:27:50 PM

34

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:27:50 PM

22

1367.00

TQEX

GENMAB A/S

28-Mar-25

2:27:50 PM

22

1367.00

AQEU

GENMAB A/S

28-Mar-25

2:28:25 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:28:25 PM

76

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:28:25 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:28:25 PM

42

1366.50

XCSE

GENMAB A/S

28-Mar-25

2:28:25 PM

10

1366.00

AQEU

GENMAB A/S

28-Mar-25

2:28:41 PM

42

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:28:41 PM

29

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:28:41 PM

30

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:28:41 PM

25

1366.00

TQEX

GENMAB A/S

28-Mar-25

2:28:41 PM

14

1366.00

AQEU

GENMAB A/S

28-Mar-25

2:28:44 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:28:44 PM

42

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:28:44 PM

21

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:28:44 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:28:48 PM

32

1366.00

CEUX

GENMAB A/S

28-Mar-25

2:29:05 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:29:05 PM

42

1366.00

XCSE

GENMAB A/S

28-Mar-25

2:30:00 PM

10

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:30:00 PM

7

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:30:00 PM

42

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:30:00 PM

26

1367.00

XCSE

GENMAB A/S

28-Mar-25

2:30:00 PM

16

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:30:00 PM

10

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:30:00 PM

30

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:30:00 PM

34

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:30:00 PM

5

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:30:00 PM

11

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:30:00 PM

2

1366.50

CEUX

GENMAB A/S

28-Mar-25

2:30:00 PM

10

1367.00

CEUX

GENMAB A/S

28-Mar-25

2:30:01 PM

101

1367.50

XCSE

GENMAB A/S

28-Mar-25

2:30:20 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:20 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:20 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:20 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:20 PM

3

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:20 PM

5

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:29 PM

16

1368.50

XCSE

GENMAB A/S

28-Mar-25

2:30:29 PM

12

1368.50

XCSE

GENMAB A/S

28-Mar-25

2:30:29 PM

7

1368.50

XCSE

GENMAB A/S

28-Mar-25

2:30:29 PM

12

1368.50

XCSE

171


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:30:29 PM

42

1368.50

XCSE

GENMAB A/S

28-Mar-25

2:30:37 PM

30

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:37 PM

42

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:38 PM

5

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:38 PM

42

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:38 PM

42

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:38 PM

10

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:38 PM

42

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:30:38 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:31:12 PM

75

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:31:12 PM

75

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:31:12 PM

36

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:31:12 PM

10

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:31:12 PM

11

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:31:12 PM

33

1370.50

TQEX

GENMAB A/S

28-Mar-25

2:31:12 PM

22

1370.50

AQEU

GENMAB A/S

28-Mar-25

2:31:16 PM

42

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:31:16 PM

20

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:31:16 PM

36

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:31:16 PM

2

1370.50

TQEX

GENMAB A/S

28-Mar-25

2:31:16 PM

22

1370.50

TQEX

GENMAB A/S

28-Mar-25

2:31:16 PM

34

1370.50

AQEU

GENMAB A/S

28-Mar-25

2:31:26 PM

2

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:31:31 PM

46

1371.00

CEUX

GENMAB A/S

28-Mar-25

2:31:31 PM

24

1371.00

CEUX

GENMAB A/S

28-Mar-25

2:31:47 PM

20

1371.00

CEUX

GENMAB A/S

28-Mar-25

2:32:17 PM

62

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:32:17 PM

14

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:32:17 PM

15

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:32:17 PM

36

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:32:25 PM

18

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:32:49 PM

44

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:32:49 PM

80

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:32:49 PM

3

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:32:49 PM

36

1371.50

CEUX

GENMAB A/S

28-Mar-25

2:32:49 PM

29

1371.50

CEUX

GENMAB A/S

28-Mar-25

2:32:49 PM

48

1371.50

CEUX

GENMAB A/S

28-Mar-25

2:32:49 PM

22

1371.50

TQEX

GENMAB A/S

28-Mar-25

2:32:49 PM

31

1371.50

AQEU

GENMAB A/S

28-Mar-25

2:33:05 PM

8

1371.50

CEUX

GENMAB A/S

28-Mar-25

2:33:05 PM

14

1371.50

CEUX

GENMAB A/S

28-Mar-25

2:33:05 PM

32

1371.50

CEUX

GENMAB A/S

28-Mar-25

2:33:09 PM

42

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:33:09 PM

12

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:33:24 PM

17

1371.00

XCSE

172


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:33:24 PM

12

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:33:24 PM

64

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:33:24 PM

42

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:33:24 PM

10

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:33:24 PM

30

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:33:24 PM

74

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:33:24 PM

28

1370.50

TQEX

GENMAB A/S

28-Mar-25

2:33:27 PM

79

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:33:40 PM

78

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:33:59 PM

30

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:33:59 PM

25

1370.50

TQEX

GENMAB A/S

28-Mar-25

2:34:17 PM

75

1369.50

XCSE

GENMAB A/S

28-Mar-25

2:34:17 PM

76

1369.50

CEUX

GENMAB A/S

28-Mar-25

2:34:17 PM

34

1369.50

TQEX

GENMAB A/S

28-Mar-25

2:34:38 PM

27

1369.50

CEUX

GENMAB A/S

28-Mar-25

2:34:38 PM

1

1369.50

CEUX

GENMAB A/S

28-Mar-25

2:34:38 PM

22

1369.50

CEUX

GENMAB A/S

28-Mar-25

2:35:25 PM

3

1370.00

CEUX

GENMAB A/S

28-Mar-25

2:35:25 PM

30

1370.00

CEUX

GENMAB A/S

28-Mar-25

2:35:26 PM

3

1370.00

CEUX

GENMAB A/S

28-Mar-25

2:35:26 PM

58

1370.00

CEUX

GENMAB A/S

28-Mar-25

2:35:35 PM

78

1369.50

CEUX

GENMAB A/S

28-Mar-25

2:35:35 PM

22

1369.50

TQEX

GENMAB A/S

28-Mar-25

2:35:42 PM

42

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:35:42 PM

14

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:35:42 PM

50

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:35:42 PM

13

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:35:42 PM

9

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:35:42 PM

13

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:35:42 PM

19

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:35:42 PM

42

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:35:42 PM

76

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:35:51 PM

42

1368.50

XCSE

GENMAB A/S

28-Mar-25

2:35:51 PM

1

1368.50

XCSE

GENMAB A/S

28-Mar-25

2:35:51 PM

18

1368.50

AQEU

GENMAB A/S

28-Mar-25

2:35:51 PM

4

1368.50

AQEU

GENMAB A/S

28-Mar-25

2:35:57 PM

4

1368.50

XCSE

GENMAB A/S

28-Mar-25

2:35:57 PM

1

1368.50

AQEU

GENMAB A/S

28-Mar-25

2:36:01 PM

75

1368.00

XCSE

GENMAB A/S

28-Mar-25

2:36:01 PM

80

1368.00

CEUX

GENMAB A/S

28-Mar-25

2:36:12 PM

25

1368.00

TQEX

GENMAB A/S

28-Mar-25

2:38:27 PM

62

1370.00

XCSE

GENMAB A/S

28-Mar-25

2:38:32 PM

35

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:38:33 PM

30

1371.00

CEUX

GENMAB A/S

28-Mar-25

2:38:33 PM

14

1371.00

CEUX

173


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:38:56 PM

38

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:38:56 PM

10

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:38:56 PM

13

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:39:19 PM

38

1373.00

XCSE

GENMAB A/S

28-Mar-25

2:39:19 PM

15

1373.00

XCSE

GENMAB A/S

28-Mar-25

2:40:47 PM

36

1373.00

CEUX

GENMAB A/S

28-Mar-25

2:40:47 PM

78

1373.00

CEUX

GENMAB A/S

28-Mar-25

2:40:47 PM

26

1373.00

AQEU

GENMAB A/S

28-Mar-25

2:41:07 PM

23

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:41:07 PM

54

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:41:07 PM

36

1372.50

TQEX

GENMAB A/S

28-Mar-25

2:41:08 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:41:08 PM

12

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:41:08 PM

12

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:41:08 PM

5

1372.50

CEUX

GENMAB A/S

28-Mar-25

2:41:08 PM

6

1372.50

CEUX

GENMAB A/S

28-Mar-25

2:41:08 PM

36

1372.50

CEUX

GENMAB A/S

28-Mar-25

2:41:09 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:41:09 PM

4

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:41:09 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:41:09 PM

61

1372.50

CEUX

GENMAB A/S

28-Mar-25

2:42:01 PM

76

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:42:05 PM

62

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:42:05 PM

36

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:42:06 PM

36

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:42:06 PM

5

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:42:14 PM

36

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:42:15 PM

16

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:42:15 PM

32

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:42:26 PM

13

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:42:26 PM

13

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:42:26 PM

44

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:42:26 PM

11

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:42:26 PM

11

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:42:28 PM

54

1371.50

CEUX

GENMAB A/S

28-Mar-25

2:43:16 PM

74

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:43:22 PM

78

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:43:22 PM

5

1371.00

CEUX

GENMAB A/S

28-Mar-25

2:43:22 PM

80

1371.00

CEUX

GENMAB A/S

28-Mar-25

2:43:22 PM

39

1371.00

CEUX

GENMAB A/S

28-Mar-25

2:43:22 PM

11

1371.00

TQEX

GENMAB A/S

28-Mar-25

2:43:22 PM

49

1372.00

TQEX

GENMAB A/S

28-Mar-25

2:43:22 PM

41

1371.00

TQEX

GENMAB A/S

28-Mar-25

2:43:22 PM

3

1371.00

TQEX

GENMAB A/S

28-Mar-25

2:43:22 PM

11

1371.00

TQEX

174


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:43:35 PM

74

1373.00

CEUX

GENMAB A/S

28-Mar-25

2:44:50 PM

24

1372.50

TQEX

GENMAB A/S

28-Mar-25

2:44:58 PM

60

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:44:58 PM

19

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:44:58 PM

75

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:44:58 PM

77

1372.00

CEUX

GENMAB A/S

28-Mar-25

2:44:58 PM

23

1372.00

AQEU

GENMAB A/S

28-Mar-25

2:44:59 PM

11

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:44:59 PM

64

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:44:59 PM

15

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:45:00 PM

15

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:45:00 PM

30

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:45:00 PM

42

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:45:00 PM

6

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:45:00 PM

13

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:45:00 PM

11

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:45:00 PM

12

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:45:01 PM

77

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:45:01 PM

101

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:45:01 PM

30

1371.00

CEUX

GENMAB A/S

28-Mar-25

2:45:01 PM

22

1371.50

TQEX

GENMAB A/S

28-Mar-25

2:45:02 PM

11

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:02 PM

12

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:02 PM

42

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:02 PM

22

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:02 PM

13

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:02 PM

42

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:02 PM

16

1370.00

XCSE

GENMAB A/S

28-Mar-25

2:45:02 PM

11

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:02 PM

12

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:02 PM

13

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:07 PM

3

1370.00

XCSE

GENMAB A/S

28-Mar-25

2:45:11 PM

22

1370.00

AQEU

GENMAB A/S

28-Mar-25

2:45:26 PM

3

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:26 PM

1

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:45:29 PM

101

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:45:29 PM

101

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:45:29 PM

101

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:45:30 PM

101

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:45:30 PM

101

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:45:55 PM

39

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:55 PM

4

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:55 PM

16

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:55 PM

42

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:56 PM

12

1372.50

XCSE

175


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:45:56 PM

20

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:56 PM

12

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:56 PM

16

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:56 PM

2

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:56 PM

42

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:56 PM

11

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:56 PM

13

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:56 PM

50

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:45:56 PM

24

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:46:36 PM

12

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:46:36 PM

2

1372.50

XCSE

GENMAB A/S

28-Mar-25

2:46:53 PM

41

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:46:53 PM

75

1371.00

XCSE

GENMAB A/S

28-Mar-25

2:46:53 PM

75

1372.00

XCSE

GENMAB A/S

28-Mar-25

2:46:53 PM

60

1371.50

XCSE

GENMAB A/S

28-Mar-25

2:46:53 PM

74

1371.50

CEUX

GENMAB A/S

28-Mar-25

2:46:53 PM

22

1371.50

TQEX

GENMAB A/S

28-Mar-25

2:47:01 PM

13

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:47:01 PM

77

1370.00

XCSE

GENMAB A/S

28-Mar-25

2:47:01 PM

50

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:47:01 PM

38

1370.50

XCSE

GENMAB A/S

28-Mar-25

2:47:01 PM

34

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:47:01 PM

45

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:47:01 PM

31

1370.00

TQEX

GENMAB A/S

28-Mar-25

2:47:56 PM

101

1370.00

XCSE

GENMAB A/S

28-Mar-25

2:47:56 PM

78

1370.00

XCSE

GENMAB A/S

28-Mar-25

2:47:56 PM

21

1369.50

XCSE

GENMAB A/S

28-Mar-25

2:47:56 PM

30

1369.50

XCSE

GENMAB A/S

28-Mar-25

2:47:56 PM

9

1369.50

XCSE

GENMAB A/S

28-Mar-25

2:47:56 PM

41

1369.50

XCSE

GENMAB A/S

28-Mar-25

2:47:56 PM

54

1369.50

CEUX

GENMAB A/S

28-Mar-25

2:47:56 PM

77

1370.50

CEUX

GENMAB A/S

28-Mar-25

2:47:57 PM

30

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:47:57 PM

12

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:47:57 PM

13

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:47:57 PM

41

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:47:57 PM

5

1369.00

XCSE

GENMAB A/S

28-Mar-25

2:48:58 PM

29

1369.00

CEUX

GENMAB A/S

28-Mar-25

2:48:58 PM

11

1369.00

CEUX

GENMAB A/S

28-Mar-25

2:49:27 PM

74

1369.50

XCSE

GENMAB A/S

28-Mar-25

2:50:54 PM

74

1374.00

XCSE

GENMAB A/S

28-Mar-25

2:50:54 PM

16

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:50:54 PM

42

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:50:54 PM

32

1373.50

TQEX

GENMAB A/S

28-Mar-25

2:51:07 PM

5

1373.50

XCSE

176


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:51:07 PM

30

1373.00

XCSE

GENMAB A/S

28-Mar-25

2:51:07 PM

43

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:51:07 PM

21

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:51:07 PM

50

1373.00

XCSE

GENMAB A/S

28-Mar-25

2:51:07 PM

77

1373.00

XCSE

GENMAB A/S

28-Mar-25

2:51:07 PM

11

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:51:07 PM

42

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:51:07 PM

76

1373.00

CEUX

GENMAB A/S

28-Mar-25

2:51:08 PM

8

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:51:08 PM

17

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:51:08 PM

12

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:00 PM

42

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:00 PM

30

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:00 PM

42

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:00 PM

64

1373.00

CEUX

GENMAB A/S

28-Mar-25

2:52:00 PM

12

1373.00

CEUX

GENMAB A/S

28-Mar-25

2:52:00 PM

22

1373.50

TQEX

GENMAB A/S

28-Mar-25

2:52:08 PM

13

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:08 PM

24

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:08 PM

12

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:09 PM

9

1373.00

XCSE

GENMAB A/S

28-Mar-25

2:52:09 PM

13

1373.00

XCSE

GENMAB A/S

28-Mar-25

2:52:09 PM

77

1373.00

CEUX

GENMAB A/S

28-Mar-25

2:52:09 PM

22

1373.00

AQEU

GENMAB A/S

28-Mar-25

2:52:21 PM

41

1373.00

XCSE

GENMAB A/S

28-Mar-25

2:52:41 PM

14

1373.00

XCSE

GENMAB A/S

28-Mar-25

2:52:53 PM

33

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:53 PM

11

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:53 PM

42

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:52:53 PM

12

1373.50

XCSE

GENMAB A/S

28-Mar-25

2:54:03 PM

74

1374.00

CEUX

GENMAB A/S

28-Mar-25

2:54:03 PM

22

1374.00

AQEU

GENMAB A/S

28-Mar-25

2:54:04 PM

4

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:54:04 PM

61

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:54:04 PM

26

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:54:04 PM

40

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:54:04 PM

12

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:54:04 PM

42

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:54:04 PM

11

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:54:31 PM

13

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:54:31 PM

13

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:55:21 PM

69

1375.00

XCSE

GENMAB A/S

28-Mar-25

2:55:21 PM

32

1375.00

XCSE

GENMAB A/S

28-Mar-25

2:55:22 PM

12

1375.00

XCSE

GENMAB A/S

28-Mar-25

2:55:25 PM

8

1374.50

TQEX

177


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

2:55:32 PM

12

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:56:27 PM

2

1375.50

CEUX

GENMAB A/S

28-Mar-25

2:56:38 PM

9

1375.00

AQEU

GENMAB A/S

28-Mar-25

2:57:25 PM

37

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:57:25 PM

5

1375.50

XCSE

GENMAB A/S

28-Mar-25

2:57:25 PM

18

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:57:25 PM

10

1374.50

XCSE

GENMAB A/S

28-Mar-25

2:57:25 PM

20

1375.50

CEUX

GENMAB A/S

28-Mar-25

2:57:25 PM

13

1375.00

AQEU

GENMAB A/S

28-Mar-25

2:57:25 PM

8

1374.00

AQEU

GENMAB A/S

28-Mar-25

2:58:13 PM

25

1375.00

XCSE

GENMAB A/S

28-Mar-25

2:58:13 PM

53

1375.00

XCSE

GENMAB A/S

28-Mar-25

2:58:13 PM

8

1375.00

XCSE

GENMAB A/S

28-Mar-25

2:58:25 PM

29

1376.00

CEUX

GENMAB A/S

28-Mar-25

2:58:25 PM

10

1376.00

CEUX

GENMAB A/S

28-Mar-25

2:58:25 PM

21

1376.00

CEUX

GENMAB A/S

28-Mar-25

2:58:40 PM

40

1376.00

XCSE

GENMAB A/S

28-Mar-25

2:59:02 PM

15

1375.50

CEUX

GENMAB A/S

28-Mar-25

2:59:02 PM

78

1375.50

CEUX

GENMAB A/S

28-Mar-25

2:59:02 PM

41

1375.50

TQEX

GENMAB A/S

28-Mar-25

2:59:25 PM

2

1375.50

XCSE

GENMAB A/S

28-Mar-25

2:59:26 PM

7

1375.50

CEUX

GENMAB A/S

28-Mar-25

2:59:59 PM

10

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

3

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

16

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

9

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

11

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

55

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

11

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

13

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

2

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

1

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

4

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

6

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

7

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

2

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

10

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

69

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

31

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:00:00 PM

26

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

38

1374.50

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

13

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

2

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

20

1374.50

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

29

1373.00

CEUX

178


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:00:00 PM

3

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

7

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

6

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

5

1374.50

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

3

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

15

1374.50

CEUX

GENMAB A/S

28-Mar-25

3:00:00 PM

6

1373.50

TQEX

GENMAB A/S

28-Mar-25

3:00:00 PM

16

1374.50

TQEX

GENMAB A/S

28-Mar-25

3:00:00 PM

8

1373.50

TQEX

GENMAB A/S

28-Mar-25

3:00:00 PM

3

1373.50

TQEX

GENMAB A/S

28-Mar-25

3:00:00 PM

5

1373.50

TQEX

GENMAB A/S

28-Mar-25

3:00:00 PM

2

1373.50

TQEX

GENMAB A/S

28-Mar-25

3:00:00 PM

3

1373.50

TQEX

GENMAB A/S

28-Mar-25

3:00:00 PM

15

1374.00

AQEU

GENMAB A/S

28-Mar-25

3:00:00 PM

7

1373.00

AQEU

GENMAB A/S

28-Mar-25

3:00:00 PM

3

1373.00

AQEU

GENMAB A/S

28-Mar-25

3:00:25 PM

5

1374.00

CEUX

GENMAB A/S

28-Mar-25

3:00:25 PM

5

1374.00

CEUX

GENMAB A/S

28-Mar-25

3:00:26 PM

31

1374.00

CEUX

GENMAB A/S

28-Mar-25

3:00:28 PM

1

1374.00

CEUX

GENMAB A/S

28-Mar-25

3:00:28 PM

4

1374.00

CEUX

GENMAB A/S

28-Mar-25

3:01:03 PM

78

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:01:03 PM

80

1374.00

CEUX

GENMAB A/S

28-Mar-25

3:01:03 PM

31

1374.00

TQEX

GENMAB A/S

28-Mar-25

3:01:03 PM

10

1373.00

AQEU

GENMAB A/S

28-Mar-25

3:01:38 PM

3

1372.50

XCSE

GENMAB A/S

28-Mar-25

3:01:38 PM

5

1372.50

XCSE

GENMAB A/S

28-Mar-25

3:01:38 PM

2

1372.50

XCSE

GENMAB A/S

28-Mar-25

3:01:38 PM

14

1372.50

XCSE

GENMAB A/S

28-Mar-25

3:01:38 PM

1

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:01:38 PM

73

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:01:38 PM

8

1373.00

AQEU

GENMAB A/S

28-Mar-25

3:02:17 PM

54

1372.50

XCSE

GENMAB A/S

28-Mar-25

3:02:26 PM

10

1372.50

TQEX

GENMAB A/S

28-Mar-25

3:02:26 PM

17

1372.50

TQEX

GENMAB A/S

28-Mar-25

3:03:12 PM

76

1372.00

CEUX

GENMAB A/S

28-Mar-25

3:03:12 PM

36

1372.50

CEUX

GENMAB A/S

28-Mar-25

3:03:12 PM

6

1372.50

CEUX

GENMAB A/S

28-Mar-25

3:04:07 PM

80

1371.50

XCSE

GENMAB A/S

28-Mar-25

3:04:17 PM

14

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:17 PM

11

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:17 PM

34

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:17 PM

42

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:18 PM

32

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:18 PM

53

1372.00

XCSE

179


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:04:18 PM

10

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:18 PM

13

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:18 PM

16

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:18 PM

11

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:18 PM

20

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:18 PM

11

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:18 PM

12

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:19 PM

11

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:19 PM

11

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:19 PM

20

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:04:28 PM

14

1372.00

CEUX

GENMAB A/S

28-Mar-25

3:04:28 PM

7

1372.00

CEUX

GENMAB A/S

28-Mar-25

3:04:28 PM

29

1372.00

CEUX

GENMAB A/S

28-Mar-25

3:04:28 PM

12

1372.00

CEUX

GENMAB A/S

28-Mar-25

3:06:02 PM

62

1373.50

CEUX

GENMAB A/S

28-Mar-25

3:06:47 PM

62

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:07:01 PM

17

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:07:30 PM

20

1373.50

CEUX

GENMAB A/S

28-Mar-25

3:07:30 PM

41

1373.50

TQEX

GENMAB A/S

28-Mar-25

3:07:55 PM

37

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:07:56 PM

13

1374.50

XCSE

GENMAB A/S

28-Mar-25

3:07:56 PM

12

1374.50

XCSE

GENMAB A/S

28-Mar-25

3:07:56 PM

14

1374.50

CEUX

GENMAB A/S

28-Mar-25

3:07:57 PM

10

1374.00

CEUX

GENMAB A/S

28-Mar-25

3:07:57 PM

65

1374.00

CEUX

GENMAB A/S

28-Mar-25

3:07:57 PM

23

1374.00

AQEU

GENMAB A/S

28-Mar-25

3:08:00 PM

40

1375.00

CEUX

GENMAB A/S

28-Mar-25

3:08:48 PM

10

1375.00

CEUX

GENMAB A/S

28-Mar-25

3:09:00 PM

11

1375.00

CEUX

GENMAB A/S

28-Mar-25

3:09:47 PM

36

1375.50

XCSE

GENMAB A/S

28-Mar-25

3:10:13 PM

40

1375.50

XCSE

GENMAB A/S

28-Mar-25

3:10:13 PM

1

1375.50

XCSE

GENMAB A/S

28-Mar-25

3:10:13 PM

15

1375.50

XCSE

GENMAB A/S

28-Mar-25

3:10:13 PM

58

1375.50

CEUX

GENMAB A/S

28-Mar-25

3:10:13 PM

36

1375.50

CEUX

GENMAB A/S

28-Mar-25

3:10:13 PM

21

1375.50

CEUX

GENMAB A/S

28-Mar-25

3:10:13 PM

15

1375.50

CEUX

GENMAB A/S

28-Mar-25

3:10:13 PM

37

1375.50

TQEX

GENMAB A/S

28-Mar-25

3:10:14 PM

10

1375.50

CEUX

GENMAB A/S

28-Mar-25

3:10:42 PM

76

1376.00

CEUX

GENMAB A/S

28-Mar-25

3:10:42 PM

28

1376.00

TQEX

GENMAB A/S

28-Mar-25

3:10:52 PM

38

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

12

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

12

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

13

1375.00

XCSE

180


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:10:52 PM

6

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

42

1374.50

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

38

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

12

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

30

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

12

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

74

1374.50

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

4

1375.00

XCSE

GENMAB A/S

28-Mar-25

3:10:52 PM

2

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:10:52 PM

59

1374.50

CEUX

GENMAB A/S

28-Mar-25

3:10:52 PM

6

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:10:52 PM

4

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:10:52 PM

16

1374.50

CEUX

GENMAB A/S

28-Mar-25

3:10:52 PM

7

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:10:52 PM

31

1374.50

TQEX

GENMAB A/S

28-Mar-25

3:10:52 PM

20

1373.50

TQEX

GENMAB A/S

28-Mar-25

3:10:52 PM

20

1373.50

AQEU

GENMAB A/S

28-Mar-25

3:10:52 PM

25

1376.00

AQEU

GENMAB A/S

28-Mar-25

3:10:52 PM

2

1373.50

AQEU

GENMAB A/S

28-Mar-25

3:10:53 PM

3

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:10:53 PM

3

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:10:53 PM

53

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:10:53 PM

1

1373.00

CEUX

GENMAB A/S

28-Mar-25

3:11:00 PM

30

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:11:00 PM

42

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:11:00 PM

42

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:11:00 PM

11

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:11:00 PM

11

1373.50

XCSE

GENMAB A/S

28-Mar-25

3:11:00 PM

77

1373.50

CEUX

GENMAB A/S

28-Mar-25

3:11:18 PM

5

1373.00

XCSE

GENMAB A/S

28-Mar-25

3:11:35 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:35 PM

16

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:35 PM

42

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:35 PM

19

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:35 PM

13

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:35 PM

17

1373.50

CEUX

GENMAB A/S

28-Mar-25

3:11:35 PM

6

1373.50

CEUX

GENMAB A/S

28-Mar-25

3:11:35 PM

30

1373.50

CEUX

GENMAB A/S

28-Mar-25

3:11:35 PM

20

1373.50

CEUX

GENMAB A/S

28-Mar-25

3:11:35 PM

25

1373.50

AQEU

GENMAB A/S

28-Mar-25

3:11:36 PM

15

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:36 PM

42

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:36 PM

15

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:36 PM

5

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:36 PM

13

1374.00

XCSE

181


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:11:36 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:36 PM

3

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:36 PM

14

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:36 PM

42

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:36 PM

30

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:36 PM

12

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:37 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:37 PM

9

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:37 PM

12

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:37 PM

42

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:37 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:37 PM

4

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:37 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:37 PM

3

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:37 PM

5

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

2

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

19

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

6

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

42

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

13

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

16

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

42

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:55 PM

23

1373.50

AQEU

GENMAB A/S

28-Mar-25

3:11:56 PM

13

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:56 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:56 PM

11

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:56 PM

12

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:11:56 PM

42

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:12:03 PM

2

1374.00

XCSE

GENMAB A/S

28-Mar-25

3:12:27 PM

60

1372.50

XCSE

GENMAB A/S

28-Mar-25

3:12:27 PM

8

1373.00

XCSE

GENMAB A/S

28-Mar-25

3:12:27 PM

1

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:12:27 PM

13

1373.00

XCSE

GENMAB A/S

28-Mar-25

3:12:27 PM

66

1373.00

XCSE

GENMAB A/S

28-Mar-25

3:12:27 PM

76

1372.00

XCSE

GENMAB A/S

28-Mar-25

3:12:27 PM

20

1373.00

XCSE

GENMAB A/S

28-Mar-25

3:12:27 PM

4

1373.00

XCSE

GENMAB A/S

28-Mar-25

3:12:27 PM

23

1373.50

CEUX

GENMAB A/S

28-Mar-25

3:12:27 PM

74

1372.50

CEUX

GENMAB A/S

28-Mar-25

3:12:27 PM

22

1372.50

TQEX

GENMAB A/S

28-Mar-25

3:12:55 PM

64

1371.50

CEUX

GENMAB A/S

28-Mar-25

3:12:55 PM

12

1371.50

CEUX

182


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:13:10 PM

80

1371.00

XCSE

GENMAB A/S

28-Mar-25

3:13:10 PM

42

1371.00

XCSE

GENMAB A/S

28-Mar-25

3:13:10 PM

17

1371.00

XCSE

GENMAB A/S

28-Mar-25

3:13:15 PM

79

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:13:15 PM

17

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:13:15 PM

53

1370.00

CEUX

GENMAB A/S

28-Mar-25

3:14:21 PM

80

1369.00

XCSE

GENMAB A/S

28-Mar-25

3:14:21 PM

27

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:14:21 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:15:00 PM

43

1370.50

TQEX

GENMAB A/S

28-Mar-25

3:15:28 PM

2

1370.50

XCSE

GENMAB A/S

28-Mar-25

3:16:21 PM

1

1370.50

XCSE

GENMAB A/S

28-Mar-25

3:16:37 PM

75

1370.50

XCSE

GENMAB A/S

28-Mar-25

3:16:37 PM

1

1370.50

XCSE

GENMAB A/S

28-Mar-25

3:16:42 PM

101

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:16:42 PM

74

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:16:42 PM

22

1370.00

AQEU

GENMAB A/S

28-Mar-25

3:16:43 PM

101

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:16:43 PM

42

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:16:43 PM

59

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:16:43 PM

80

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:16:53 PM

40

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:16:53 PM

22

1369.50

TQEX

GENMAB A/S

28-Mar-25

3:16:58 PM

74

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:16:58 PM

23

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:16:58 PM

25

1368.50

AQEU

GENMAB A/S

28-Mar-25

3:17:10 PM

12

1368.50

AQEU

GENMAB A/S

28-Mar-25

3:17:10 PM

10

1368.50

AQEU

GENMAB A/S

28-Mar-25

3:17:47 PM

35

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:17:47 PM

42

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:17:47 PM

35

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:17:47 PM

16

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:18:54 PM

50

1368.50

CEUX

GENMAB A/S

28-Mar-25

3:18:54 PM

22

1368.50

AQEU

GENMAB A/S

28-Mar-25

3:18:56 PM

15

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:18:56 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:18:56 PM

30

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:18:56 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:18:56 PM

80

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:18:56 PM

14

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:21:12 PM

73

1369.00

XCSE

GENMAB A/S

28-Mar-25

3:21:12 PM

2

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:21:12 PM

75

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:21:12 PM

22

1369.50

TQEX

GENMAB A/S

28-Mar-25

3:21:25 PM

12

1369.50

XCSE

183


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:21:26 PM

6

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:22:27 PM

53

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:22:30 PM

4

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:23:10 PM

28

1370.00

TQEX

GENMAB A/S

28-Mar-25

3:24:37 PM

74

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:24:42 PM

11

1370.00

AQEU

GENMAB A/S

28-Mar-25

3:25:10 PM

30

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:25:10 PM

11

1370.00

AQEU

GENMAB A/S

28-Mar-25

3:25:43 PM

9

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:25:57 PM

71

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:25:57 PM

36

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:25:57 PM

34

1370.50

AQEU

GENMAB A/S

28-Mar-25

3:26:25 PM

13

1371.00

XCSE

GENMAB A/S

28-Mar-25

3:26:25 PM

6

1371.00

CEUX

GENMAB A/S

28-Mar-25

3:26:28 PM

6

1371.00

CEUX

GENMAB A/S

28-Mar-25

3:27:26 PM

22

1371.00

CEUX

GENMAB A/S

28-Mar-25

3:27:50 PM

3

1371.00

XCSE

GENMAB A/S

28-Mar-25

3:27:50 PM

11

1371.00

CEUX

GENMAB A/S

28-Mar-25

3:28:29 PM

24

1371.00

TQEX

GENMAB A/S

28-Mar-25

3:28:29 PM

13

1371.00

TQEX

GENMAB A/S

28-Mar-25

3:28:38 PM

61

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:28:38 PM

15

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:29:26 PM

12

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:30:43 PM

34

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:30:43 PM

16

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:30:47 PM

20

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:30:59 PM

13

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:30:59 PM

42

1370.50

XCSE

GENMAB A/S

28-Mar-25

3:30:59 PM

22

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:30:59 PM

35

1370.50

XCSE

GENMAB A/S

28-Mar-25

3:30:59 PM

4

1370.50

XCSE

GENMAB A/S

28-Mar-25

3:30:59 PM

44

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:30:59 PM

20

1370.50

XCSE

GENMAB A/S

28-Mar-25

3:30:59 PM

79

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:30:59 PM

7

1370.50

CEUX

GENMAB A/S

28-Mar-25

3:30:59 PM

46

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:30:59 PM

25

1370.00

TQEX

GENMAB A/S

28-Mar-25

3:31:00 PM

12

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:00 PM

11

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:00 PM

20

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:00 PM

20

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:00 PM

12

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:00 PM

12

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:00 PM

42

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:00 PM

12

1370.00

XCSE

184


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:31:00 PM

12

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:00 PM

13

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:00 PM

21

1369.50

TQEX

GENMAB A/S

28-Mar-25

3:31:00 PM

3

1369.50

TQEX

GENMAB A/S

28-Mar-25

3:31:01 PM

42

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:01 PM

13

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:01 PM

19

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:01 PM

42

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:01 PM

11

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:01 PM

13

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:02 PM

5

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:02 PM

11

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:22 PM

12

1370.00

XCSE

GENMAB A/S

28-Mar-25

3:31:30 PM

31

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:31:30 PM

45

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:31:30 PM

27

1369.50

TQEX

GENMAB A/S

28-Mar-25

3:31:31 PM

2

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:47 PM

30

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:47 PM

11

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:47 PM

13

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:47 PM

13

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:47 PM

41

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:47 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:47 PM

36

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:31:47 PM

6

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:31:47 PM

5

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:31:51 PM

13

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:51 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:51 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:52 PM

3

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:52 PM

13

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:52 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:53 PM

11

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:55 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:55 PM

13

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:55 PM

41

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:55 PM

41

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:55 PM

12

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:31:56 PM

41

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:56 PM

41

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:56 PM

41

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:56 PM

13

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:56 PM

11

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:56 PM

13

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:56 PM

11

1369.50

XCSE

185


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:31:56 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:56 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:57 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:31:58 PM

13

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:32:08 PM

10

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:32:08 PM

15

1369.50

CEUX

GENMAB A/S

28-Mar-25

3:32:10 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:32:10 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:32:11 PM

11

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:32:11 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:32:18 PM

7

1369.00

XCSE

GENMAB A/S

28-Mar-25

3:32:32 PM

52

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:32:32 PM

6

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:32:32 PM

17

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:32:32 PM

69

1368.50

CEUX

GENMAB A/S

28-Mar-25

3:32:32 PM

42

1368.50

TQEX

GENMAB A/S

28-Mar-25

3:33:13 PM

23

1368.00

AQEU

GENMAB A/S

28-Mar-25

3:33:26 PM

35

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:33:26 PM

1

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:33:27 PM

4

1368.50

XCSE

GENMAB A/S

28-Mar-25

3:33:27 PM

73

1368.50

XCSE

GENMAB A/S

28-Mar-25

3:33:28 PM

2

1368.50

XCSE

GENMAB A/S

28-Mar-25

3:33:29 PM

20

1368.50

XCSE

GENMAB A/S

28-Mar-25

3:33:48 PM

53

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:09 PM

24

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:09 PM

78

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:34:25 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:25 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:25 PM

20

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:25 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:25 PM

42

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:25 PM

44

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:25 PM

25

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:25 PM

3

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:25 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:34:28 PM

3

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:34:28 PM

11

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:34:28 PM

78

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:34:37 PM

20

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:34:37 PM

3

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:34:37 PM

10

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:34:48 PM

20

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:34:48 PM

20

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:34:51 PM

4

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:36:00 PM

36

1369.00

XCSE

186


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:36:00 PM

43

1369.00

XCSE

GENMAB A/S

28-Mar-25

3:36:15 PM

4

1369.00

XCSE

GENMAB A/S

28-Mar-25

3:36:15 PM

1

1369.00

XCSE

GENMAB A/S

28-Mar-25

3:36:20 PM

75

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:36:28 PM

12

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:36:28 PM

65

1369.00

XCSE

GENMAB A/S

28-Mar-25

3:36:28 PM

11

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:36:28 PM

13

1369.00

XCSE

GENMAB A/S

28-Mar-25

3:36:28 PM

39

1369.50

XCSE

GENMAB A/S

28-Mar-25

3:37:38 PM

23

1368.50

TQEX

GENMAB A/S

28-Mar-25

3:37:47 PM

76

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:18 PM

75

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:38:18 PM

5

1369.00

CEUX

GENMAB A/S

28-Mar-25

3:38:31 PM

50

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:38:31 PM

24

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:38:38 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:38 PM

9

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:38 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:39 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:39 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:39 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:39 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:39 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:39 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:40 PM

33

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:40 PM

33

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:40 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:40 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:40 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:40 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:41 PM

33

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:41 PM

33

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:41 PM

33

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:41 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:41 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:41 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:41 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:41 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:41 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:42 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:42 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:42 PM

33

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:42 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:42 PM

33

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:42 PM

33

1368.00

XCSE

187


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:38:42 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:51 PM

42

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:38:51 PM

8

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:39:11 PM

2

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:39:11 PM

15

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:39:11 PM

53

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:39:17 PM

80

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:40:27 PM

46

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:41:05 PM

34

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:41:05 PM

35

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:41:05 PM

8

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:41:07 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:41:08 PM

32

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:41:38 PM

6

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:41:38 PM

6

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:43:01 PM

30

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:43:01 PM

45

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:43:01 PM

25

1367.00

TQEX

GENMAB A/S

28-Mar-25

3:43:14 PM

23

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:43:26 PM

54

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:43:26 PM

20

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:43:26 PM

1

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:43:57 PM

44

1366.50

XCSE

GENMAB A/S

28-Mar-25

3:44:05 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

3:44:05 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

3:44:05 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

3:44:06 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

3:44:10 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

3:44:10 PM

42

1366.50

XCSE

GENMAB A/S

28-Mar-25

3:44:42 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

3:44:42 PM

36

1366.50

CEUX

GENMAB A/S

28-Mar-25

3:45:34 PM

35

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:45:34 PM

41

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:45:44 PM

16

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:44 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:44 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:44 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:44 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:44 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:44 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:45 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:45 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:49 PM

39

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:49 PM

40

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:49 PM

11

1367.00

XCSE

188


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:45:49 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:49 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:49 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:49 PM

39

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:49 PM

1

1366.50

AQEU

GENMAB A/S

28-Mar-25

3:45:49 PM

20

1366.50

AQEU

GENMAB A/S

28-Mar-25

3:45:49 PM

10

1366.50

AQEU

GENMAB A/S

28-Mar-25

3:45:50 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:50 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:50 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:50 PM

39

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:50 PM

34

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:50 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:50 PM

39

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:50 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:51 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:51 PM

35

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:51 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:45:51 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:46:07 PM

77

1366.00

XCSE

GENMAB A/S

28-Mar-25

3:46:07 PM

22

1366.00

TQEX

GENMAB A/S

28-Mar-25

3:46:08 PM

22

1366.50

CEUX

GENMAB A/S

28-Mar-25

3:46:08 PM

20

1366.50

CEUX

GENMAB A/S

28-Mar-25

3:46:51 PM

74

1366.50

XCSE

GENMAB A/S

28-Mar-25

3:46:51 PM

12

1366.50

CEUX

GENMAB A/S

28-Mar-25

3:46:51 PM

25

1366.50

CEUX

GENMAB A/S

28-Mar-25

3:46:51 PM

48

1366.50

TQEX

GENMAB A/S

28-Mar-25

3:46:57 PM

75

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:52:12 PM

8

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:52:12 PM

8

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:13 PM

9

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:22 PM

4

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:52:22 PM

4

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:22 PM

2

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:29 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:29 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:30 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:30 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:33 PM

32

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:38 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

3:52:38 PM

9

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:39 PM

27

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:39 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:39 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:39 PM

6

1368.00

CEUX

189


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:52:48 PM

3

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:52:53 PM

24

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:53:07 PM

31

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:53:27 PM

1

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:55:15 PM

13

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:15 PM

13

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:15 PM

1

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:15 PM

78

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:55:15 PM

42

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:15 PM

11

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:16 PM

18

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:16 PM

24

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:16 PM

6

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:16 PM

17

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:16 PM

42

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:16 PM

13

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:16 PM

82

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:55:28 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:55:28 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:55:28 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:55:28 PM

5

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:55:28 PM

13

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:55:28 PM

14

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:55:28 PM

5

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:55:57 PM

26

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:55:57 PM

36

1367.00

CEUX

GENMAB A/S

28-Mar-25

3:56:01 PM

67

1366.50

CEUX

GENMAB A/S

28-Mar-25

3:56:01 PM

11

1366.50

CEUX

GENMAB A/S

28-Mar-25

3:56:01 PM

3

1366.50

TQEX

GENMAB A/S

28-Mar-25

3:57:31 PM

11

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:57:31 PM

25

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:57:31 PM

10

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:57:31 PM

20

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:58:16 PM

36

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:58:25 PM

11

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:58:26 PM

9

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:58:47 PM

77

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:58:47 PM

36

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:58:47 PM

66

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:58:48 PM

23

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:58:48 PM

78

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:25 PM

10

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:26 PM

16

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:57 PM

80

1367.00

XCSE

GENMAB A/S

28-Mar-25

3:59:57 PM

5

1367.50

CEUX

190


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

3:59:57 PM

6

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:59:57 PM

36

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:57 PM

5

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:59:57 PM

78

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:57 PM

5

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:59:57 PM

14

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:59:57 PM

30

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:59:58 PM

91

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:59:58 PM

2

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:59:58 PM

8

1367.50

XCSE

GENMAB A/S

28-Mar-25

3:59:58 PM

5

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:58 PM

25

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:58 PM

76

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:58 PM

6

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:59 PM

5

1367.50

CEUX

GENMAB A/S

28-Mar-25

3:59:59 PM

33

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:59:59 PM

5

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:59:59 PM

5

1368.00

CEUX

GENMAB A/S

28-Mar-25

3:59:59 PM

36

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:00:00 PM

13

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:00:00 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:00:02 PM

32

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:00:18 PM

2

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:00:21 PM

78

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:00:21 PM

32

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:00:31 PM

41

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:31 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:31 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:31 PM

60

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:31 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:31 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:31 PM

6

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:00:31 PM

68

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:00:31 PM

76

1367.00

TQEX

GENMAB A/S

28-Mar-25

4:00:31 PM

39

1367.00

AQEU

GENMAB A/S

28-Mar-25

4:00:32 PM

44

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:32 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:32 PM

35

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:32 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:45 PM

4

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:45 PM

30

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:45 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:45 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:45 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

11

1367.00

XCSE

191


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:00:46 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

30

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

3

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

33

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

38

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

47

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

1

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:46 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:47 PM

1

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:47 PM

14

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:00:58 PM

42

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:00:58 PM

59

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:01:00 PM

34

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:00 PM

43

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:00 PM

79

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:01:06 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:06 PM

41

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:06 PM

42

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:06 PM

11

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:06 PM

11

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:07 PM

2

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:13 PM

28

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:01:13 PM

18

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:13 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:13 PM

42

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:01:13 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:01:13 PM

76

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:01:13 PM

22

1365.50

AQEU

GENMAB A/S

28-Mar-25

4:01:15 PM

28

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:01:15 PM

59

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:01:25 PM

11

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:01:25 PM

12

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:02:23 PM

7

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:02:24 PM

8

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:02:26 PM

1

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:02:26 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:02:55 PM

37

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:02:55 PM

34

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:02:55 PM

40

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:02:55 PM

23

1365.50

AQEU

192


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:02:56 PM

39

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:02:56 PM

42

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:02:56 PM

24

1365.00

TQEX

GENMAB A/S

28-Mar-25

4:03:05 PM

13

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:03:28 PM

10

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:03:46 PM

34

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:03:46 PM

46

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:04:42 PM

11

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:04:52 PM

32

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:04:52 PM

41

1365.00

TQEX

GENMAB A/S

28-Mar-25

4:04:52 PM

30

1365.00

TQEX

GENMAB A/S

28-Mar-25

4:05:00 PM

11

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:05:11 PM

77

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:05:25 PM

12

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:05:43 PM

43

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:05:43 PM

37

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:05:43 PM

1

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:05:43 PM

38

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:05:43 PM

76

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:05:43 PM

25

1365.00

TQEX

GENMAB A/S

28-Mar-25

4:06:37 PM

60

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:07:25 PM

1

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:07:25 PM

10

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:07:26 PM

1

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:07:30 PM

11

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:07:30 PM

13

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:07:30 PM

36

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:07:30 PM

6

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:07:30 PM

6

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:07:30 PM

41

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:08:07 PM

14

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:07 PM

36

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:07 PM

78

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:07 PM

44

1365.00

TQEX

GENMAB A/S

28-Mar-25

4:08:16 PM

23

1364.50

AQEU

GENMAB A/S

28-Mar-25

4:08:25 PM

36

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:25 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:25 PM

6

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:26 PM

13

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:26 PM

52

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:26 PM

13

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:26 PM

23

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:27 PM

24

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:27 PM

12

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:27 PM

12

1365.00

XCSE

193


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:08:27 PM

51

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:27 PM

11

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:28 PM

13

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:28 PM

27

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:30 PM

11

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:30 PM

11

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:33 PM

11

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:08:38 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:38 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:38 PM

12

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:48 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:48 PM

7

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:48 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:48 PM

19

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:08:54 PM

42

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:08:54 PM

12

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:08:54 PM

42

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:08:54 PM

1

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:09:25 PM

3

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:09:25 PM

2

1364.50

AQEU

GENMAB A/S

28-Mar-25

4:09:29 PM

10

1364.50

AQEU

GENMAB A/S

28-Mar-25

4:10:02 PM

41

1364.50

TQEX

GENMAB A/S

28-Mar-25

4:10:07 PM

25

1364.50

AQEU

GENMAB A/S

28-Mar-25

4:10:48 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:10:48 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:10:54 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:03 PM

2

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:11:19 PM

36

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:11:19 PM

6

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:11:19 PM

6

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:11:19 PM

9

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:11:19 PM

34

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:11:26 PM

10

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:11:32 PM

32

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:11:39 PM

42

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:39 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:39 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:39 PM

18

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:39 PM

15

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:40 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:40 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:40 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:40 PM

78

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:41 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:11:41 PM

13

1366.00

XCSE

194


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:11:57 PM

11

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:12:03 PM

2

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:12:26 PM

3

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

74

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:12:27 PM

74

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

2

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

2

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

2

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

2

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

6

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

15

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

3

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:27 PM

31

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:12:35 PM

41

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:37 PM

32

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

3

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

32

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

25

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

2

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

42

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

2

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

80

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

20

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

1

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

5

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

2

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

5

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

21

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

43

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

2

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

17

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:12:46 PM

2

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

12

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

5

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

2

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

2

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

30

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

8

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

10

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

15

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

10

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

36

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

4

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

4

1363.50

CEUX

195


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:12:46 PM

3

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

10

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:12:46 PM

46

1364.50

TQEX

GENMAB A/S

28-Mar-25

4:12:47 PM

34

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:12:47 PM

2

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:13:27 PM

71

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:27 PM

6

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:27 PM

36

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:13:28 PM

41

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:28 PM

21

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:28 PM

8

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:28 PM

42

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:28 PM

11

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:28 PM

10

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:28 PM

5

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:29 PM

11

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:29 PM

12

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:29 PM

11

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:32 PM

13

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:32 PM

13

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:32 PM

42

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:13:33 PM

22

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:13:56 PM

44

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:14:00 PM

12

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:14:00 PM

12

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:14:00 PM

16

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:14:10 PM

12

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:14:10 PM

42

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:14:10 PM

12

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:14:40 PM

11

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:14:40 PM

66

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:14:43 PM

12

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:43 PM

10

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:43 PM

77

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:43 PM

12

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:14:43 PM

35

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:14:43 PM

10

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:14:43 PM

29

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:14:52 PM

31

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:52 PM

42

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:52 PM

11

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:52 PM

11

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:52 PM

12

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:52 PM

33

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:52 PM

13

1364.00

XCSE

196


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:14:52 PM

11

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:52 PM

27

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:52 PM

13

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:53 PM

13

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:53 PM

30

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:53 PM

12

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:53 PM

13

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:53 PM

12

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:53 PM

42

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:54 PM

64

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:54 PM

15

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:55 PM

21

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:55 PM

42

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:55 PM

27

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:55 PM

13

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:55 PM

61

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:57 PM

11

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:14:57 PM

27

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:15:10 PM

80

1364.00

XCSE

GENMAB A/S

28-Mar-25

4:15:10 PM

79

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:15:10 PM

23

1364.00

TQEX

GENMAB A/S

28-Mar-25

4:15:59 PM

27

1364.00

AQEU

GENMAB A/S

28-Mar-25

4:16:13 PM

75

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:16:13 PM

4

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:16:13 PM

32

1364.00

CEUX

GENMAB A/S

28-Mar-25

4:16:13 PM

12

1364.00

AQEU

GENMAB A/S

28-Mar-25

4:16:14 PM

1

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:16:14 PM

3

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:16:14 PM

13

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:16:14 PM

75

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:16:15 PM

43

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:16:34 PM

25

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:16:51 PM

77

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:17:25 PM

12

1363.50

AQEU

GENMAB A/S

28-Mar-25

4:17:57 PM

4

1363.50

AQEU

GENMAB A/S

28-Mar-25

4:19:00 PM

28

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:19:00 PM

52

1363.50

XCSE

GENMAB A/S

28-Mar-25

4:19:00 PM

36

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:19:00 PM

7

1363.50

AQEU

GENMAB A/S

28-Mar-25

4:19:00 PM

2

1363.50

AQEU

GENMAB A/S

28-Mar-25

4:19:27 PM

2

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:19:27 PM

16

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:19:50 PM

11

1363.50

CEUX

GENMAB A/S

28-Mar-25

4:21:07 PM

49

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:21:07 PM

31

1364.50

XCSE

197


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:21:07 PM

27

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:21:07 PM

56

1364.50

CEUX

GENMAB A/S

28-Mar-25

4:21:07 PM

77

1364.50

CEUX

GENMAB A/S

28-Mar-25

4:21:07 PM

45

1364.50

CEUX

GENMAB A/S

28-Mar-25

4:21:07 PM

35

1364.50

AQEU

GENMAB A/S

28-Mar-25

4:21:08 PM

14

1364.50

CEUX

GENMAB A/S

28-Mar-25

4:21:30 PM

75

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:21:30 PM

8

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:21:30 PM

7

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:21:34 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:21:34 PM

6

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:21:34 PM

6

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:21:34 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:21:34 PM

17

1364.50

CEUX

GENMAB A/S

28-Mar-25

4:21:43 PM

58

1364.50

CEUX

GENMAB A/S

28-Mar-25

4:21:43 PM

36

1364.50

CEUX

GENMAB A/S

28-Mar-25

4:21:44 PM

4

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:21:44 PM

41

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:23:07 PM

46

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:23:32 PM

95

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:23:32 PM

2

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:23:32 PM

18

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:23:32 PM

14

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:23:32 PM

8

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:23:32 PM

10

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:23:57 PM

29

1365.00

TQEX

GENMAB A/S

28-Mar-25

4:24:00 PM

30

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:24:00 PM

28

1365.00

TQEX

GENMAB A/S

28-Mar-25

4:24:00 PM

8

1365.00

AQEU

GENMAB A/S

28-Mar-25

4:24:03 PM

8

1365.00

AQEU

GENMAB A/S

28-Mar-25

4:24:37 PM

34

1364.50

XCSE

GENMAB A/S

28-Mar-25

4:24:37 PM

8

1365.00

AQEU

GENMAB A/S

28-Mar-25

4:25:28 PM

8

1365.00

AQEU

GENMAB A/S

28-Mar-25

4:26:28 PM

1

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:28 PM

59

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:28 PM

6

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:28 PM

11

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:32 PM

53

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:32 PM

12

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:32 PM

12

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:32 PM

12

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:32 PM

36

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:32 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:32 PM

6

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:33 PM

24

1365.00

CEUX

198


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:26:33 PM

21

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:33 PM

6

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:35 PM

12

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:35 PM

11

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:35 PM

13

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:35 PM

5

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:36 PM

42

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:26:36 PM

31

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:36 PM

21

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:41 PM

73

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:26:53 PM

45

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:26:53 PM

36

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:26:53 PM

34

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:26:54 PM

41

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:27:49 PM

28

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:27:49 PM

17

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:27:49 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:27:49 PM

5

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:27:49 PM

48

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:27:49 PM

8

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:27:49 PM

31

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:27:49 PM

53

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:27:50 PM

18

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:27:50 PM

53

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:28:00 PM

3

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:28:27 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:28:27 PM

53

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:28:42 PM

43

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:28:42 PM

28

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:28:42 PM

36

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:28:42 PM

54

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:28:44 PM

11

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:29:03 PM

13

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:29:17 PM

35

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:17 PM

6

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:29:17 PM

36

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:29:17 PM

5

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:29:17 PM

25

1365.50

AQEU

GENMAB A/S

28-Mar-25

4:29:26 PM

13

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

12

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

11

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

18

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

12

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

30

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

30

1365.50

XCSE

199


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:29:26 PM

11

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

13

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

13

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

13

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

12

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

30

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

21

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:26 PM

6

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:29:26 PM

6

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:29:26 PM

36

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:29:26 PM

17

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:29:26 PM

6

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:29:26 PM

26

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:29:26 PM

6

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:29:26 PM

6

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:29:27 PM

12

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:27 PM

9

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:29:27 PM

13

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:30:17 PM

11

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:30:25 PM

2

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:30:43 PM

10

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:30:49 PM

3

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:31:04 PM

12

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:31:05 PM

42

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:31:31 PM

20

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:31:31 PM

30

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:31:37 PM

36

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:31:46 PM

62

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:31:55 PM

31

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:00 PM

11

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:00 PM

10

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:03 PM

15

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:03 PM

11

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:11 PM

58

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:12 PM

34

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:15 PM

28

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:16 PM

8

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:32:16 PM

17

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:16 PM

56

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:32:17 PM

2

1366.00

AQEU

GENMAB A/S

28-Mar-25

4:32:28 PM

63

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:32:28 PM

10

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:32:28 PM

22

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:32:28 PM

15

1366.00

AQEU

GENMAB A/S

28-Mar-25

4:32:28 PM

16

1366.00

AQEU

200


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:32:45 PM

51

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:46 PM

7

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:32:46 PM

64

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:32:46 PM

22

1366.00

AQEU

GENMAB A/S

28-Mar-25

4:32:47 PM

23

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:32:48 PM

5

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:33:07 PM

48

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:33:26 PM

10

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:26 PM

25

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:26 PM

2

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:26 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:26 PM

53

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:26 PM

75

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:33:26 PM

24

1366.50

TQEX

GENMAB A/S

28-Mar-25

4:33:27 PM

9

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:27 PM

42

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:27 PM

50

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:28 PM

73

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:31 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:31 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:31 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:31 PM

53

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:38 PM

5

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:39 PM

18

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:39 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:39 PM

53

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:39 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:40 PM

43

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:53 PM

53

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:53 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:53 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:33:54 PM

10

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:33:59 PM

16

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:34:00 PM

40

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:34:00 PM

22

1366.50

AQEU

GENMAB A/S

28-Mar-25

4:34:37 PM

5

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:34:37 PM

42

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:34:37 PM

36

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:34:37 PM

13

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:34:41 PM

30

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:34:41 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:34:41 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:34:41 PM

1

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:34:45 PM

7

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:34:45 PM

10

1367.00

XCSE

201


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:34:45 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:34:45 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:34:45 PM

30

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:34:45 PM

53

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:34:51 PM

12

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:34:51 PM

13

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:35:01 PM

1

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:35:01 PM

2

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:35:01 PM

25

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:35:01 PM

1

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:35:01 PM

32

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:35:01 PM

28

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:35:01 PM

22

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:35:01 PM

3

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:35:03 PM

3

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:35:03 PM

2

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:35:03 PM

3

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:35:03 PM

7

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:35:03 PM

15

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:35:03 PM

2

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:35:03 PM

1

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:35:03 PM

3

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:35:03 PM

3

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:35:03 PM

10

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:35:03 PM

2

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:35:03 PM

3

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:35:03 PM

3

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:35:08 PM

79

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:08 PM

5

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:08 PM

53

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:08 PM

15

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:08 PM

7

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:08 PM

11

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:08 PM

10

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:08 PM

28

1368.50

TQEX

GENMAB A/S

28-Mar-25

4:35:20 PM

76

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:20 PM

21

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:35:20 PM

10

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:35:20 PM

45

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:35:20 PM

25

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:35:20 PM

3

1368.50

TQEX

GENMAB A/S

28-Mar-25

4:35:20 PM

7

1368.50

TQEX

GENMAB A/S

28-Mar-25

4:35:20 PM

4

1368.50

TQEX

GENMAB A/S

28-Mar-25

4:35:20 PM

4

1368.50

TQEX

GENMAB A/S

28-Mar-25

4:35:20 PM

2

1368.50

TQEX

202


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:35:20 PM

2

1368.50

TQEX

GENMAB A/S

28-Mar-25

4:35:20 PM

22

1369.00

AQEU

GENMAB A/S

28-Mar-25

4:35:25 PM

10

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:25 PM

12

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:25 PM

11

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:26 PM

5

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:34 PM

25

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:35:34 PM

7

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:35:34 PM

14

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:35:37 PM

18

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:35:37 PM

12

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:35:37 PM

9

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:35:37 PM

36

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:35:37 PM

20

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:35:37 PM

6

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:35:37 PM

48

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:35:37 PM

5

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:35:37 PM

5

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:35:37 PM

3

1367.00

TQEX

GENMAB A/S

28-Mar-25

4:35:37 PM

3

1367.00

TQEX

GENMAB A/S

28-Mar-25

4:35:37 PM

2

1367.00

TQEX

GENMAB A/S

28-Mar-25

4:35:37 PM

6

1367.00

TQEX

GENMAB A/S

28-Mar-25

4:35:37 PM

17

1367.00

TQEX

GENMAB A/S

28-Mar-25

4:35:37 PM

5

1367.00

TQEX

GENMAB A/S

28-Mar-25

4:36:18 PM

65

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:18 PM

36

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:27 PM

15

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:36:30 PM

12

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:30 PM

22

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:30 PM

1

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:30 PM

13

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:30 PM

53

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:30 PM

12

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:36:31 PM

12

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:31 PM

10

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:36:31 PM

53

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:31 PM

2

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:31 PM

24

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:36:31 PM

23

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:36:42 PM

7

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:36:57 PM

10

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:36:57 PM

11

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:36:57 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:36:57 PM

3

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:36:57 PM

8

1368.00

CEUX

203


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:36:59 PM

69

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:37:08 PM

6

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:37:08 PM

15

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:37:08 PM

6

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:37:08 PM

12

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:37:26 PM

7

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:37:26 PM

22

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:37:37 PM

10

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:37:37 PM

6

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:37:37 PM

6

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:37:37 PM

25

1367.00

AQEU

GENMAB A/S

28-Mar-25

4:37:46 PM

10

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:37:46 PM

63

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:38:34 PM

26

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:38:34 PM

30

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:38:34 PM

15

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:38:47 PM

65

1367.00

CEUX

GENMAB A/S

28-Mar-25

4:39:14 PM

22

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:39:14 PM

75

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:39:14 PM

8

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:39:16 PM

83

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:39:17 PM

12

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:39:37 PM

11

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:39:48 PM

52

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:40:32 PM

1

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:32 PM

1

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:32 PM

5

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:33 PM

90

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:40:33 PM

9

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:40:40 PM

53

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:40 PM

11

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:40 PM

3

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:45 PM

39

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:40:48 PM

53

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:48 PM

10

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:48 PM

12

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:48 PM

79

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:48 PM

12

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:40:48 PM

27

1367.50

TQEX

GENMAB A/S

28-Mar-25

4:41:00 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:00 PM

32

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:00 PM

42

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:00 PM

2

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:00 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:00 PM

25

1368.00

XCSE

204


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:41:00 PM

46

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:00 PM

10

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:00 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:00 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:01 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:01 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:01 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:01 PM

93

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:03 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:03 PM

53

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:03 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:03 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:04 PM

12

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:04 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:04 PM

11

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:15 PM

5

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:41:17 PM

56

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:41:37 PM

53

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:41:37 PM

12

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:41:37 PM

11

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:41:39 PM

93

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:41:40 PM

53

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:41:40 PM

13

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:41:40 PM

11

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:42:05 PM

12

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:42:05 PM

11

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:42:05 PM

53

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:42:06 PM

39

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:42:15 PM

46

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:42:18 PM

35

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:42:18 PM

19

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:42:18 PM

17

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:42:18 PM

42

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:42:18 PM

9

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:42:18 PM

42

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:42:18 PM

25

1368.50

TQEX

GENMAB A/S

28-Mar-25

4:42:23 PM

13

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:42:23 PM

9

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:42:23 PM

12

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:43:02 PM

52

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:43:02 PM

11

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:43:02 PM

101

1369.00

CEUX

GENMAB A/S

28-Mar-25

4:43:18 PM

49

1369.00

CEUX

GENMAB A/S

28-Mar-25

4:43:27 PM

26

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:43:36 PM

28

1369.00

XCSE

205


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:43:36 PM

53

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:43:38 PM

37

1369.00

CEUX

GENMAB A/S

28-Mar-25

4:43:38 PM

8

1369.00

CEUX

GENMAB A/S

28-Mar-25

4:43:46 PM

40

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:43:46 PM

29

1369.00

AQEU

GENMAB A/S

28-Mar-25

4:43:49 PM

22

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:44:02 PM

28

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:44:02 PM

19

1369.00

XCSE

GENMAB A/S

28-Mar-25

4:44:08 PM

13

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:44:08 PM

12

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:44:08 PM

53

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:44:08 PM

50

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:44:08 PM

20

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:44:08 PM

22

1368.50

TQEX

GENMAB A/S

28-Mar-25

4:44:13 PM

12

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:44:23 PM

7

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:44:28 PM

10

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:44:28 PM

28

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:44:28 PM

10

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:44:28 PM

22

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:45:00 PM

12

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:45:08 PM

24

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:45:08 PM

42

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:45:28 PM

1

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:45:28 PM

4

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:45:28 PM

31

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:45:28 PM

2

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:46:15 PM

41

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:46:17 PM

33

1368.50

TQEX

GENMAB A/S

28-Mar-25

4:46:22 PM

11

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:22 PM

5

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:22 PM

1

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:22 PM

5

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:22 PM

42

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:46:24 PM

13

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:24 PM

1

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:24 PM

11

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:24 PM

44

1368.50

CEUX

GENMAB A/S

28-Mar-25

4:46:29 PM

30

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:29 PM

13

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:29 PM

53

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:29 PM

13

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:29 PM

12

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:29 PM

8

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:29 PM

5

1368.50

XCSE

206


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:46:29 PM

12

1368.50

XCSE

GENMAB A/S

28-Mar-25

4:46:47 PM

21

1368.00

AQEU

GENMAB A/S

28-Mar-25

4:47:24 PM

1

1368.00

AQEU

GENMAB A/S

28-Mar-25

4:47:25 PM

30

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:47:25 PM

21

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:47:26 PM

11

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:47:37 PM

22

1368.00

AQEU

GENMAB A/S

28-Mar-25

4:47:55 PM

47

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:47:55 PM

34

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:47:55 PM

11

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:48:02 PM

47

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:48:02 PM

12

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:48:04 PM

5

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:48:04 PM

42

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:48:04 PM

5

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:48:05 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:48:05 PM

13

1368.00

XCSE

GENMAB A/S

28-Mar-25

4:48:05 PM

36

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:48:05 PM

2

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:48:05 PM

2

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:48:05 PM

11

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:48:07 PM

33

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:48:07 PM

37

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:48:07 PM

25

1367.50

TQEX

GENMAB A/S

28-Mar-25

4:48:07 PM

2

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:48:07 PM

11

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:48:07 PM

3

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:48:07 PM

6

1368.00

TQEX

GENMAB A/S

28-Mar-25

4:48:25 PM

33

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:48:36 PM

41

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:48:36 PM

8

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:48:52 PM

14

1367.00

AQEU

GENMAB A/S

28-Mar-25

4:48:52 PM

5

1367.00

AQEU

GENMAB A/S

28-Mar-25

4:48:55 PM

12

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:48:55 PM

34

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:49:19 PM

27

1368.00

AQEU

GENMAB A/S

28-Mar-25

4:49:26 PM

78

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:49:26 PM

17

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:49:26 PM

51

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:49:26 PM

5

1368.00

CEUX

GENMAB A/S

28-Mar-25

4:49:26 PM

18

1367.50

CEUX

GENMAB A/S

28-Mar-25

4:49:26 PM

23

1367.50

TQEX

GENMAB A/S

28-Mar-25

4:49:27 PM

13

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:49:27 PM

11

1367.50

XCSE

GENMAB A/S

28-Mar-25

4:49:45 PM

8

1367.00

AQEU

207


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:50:00 PM

11

1367.00

XCSE

GENMAB A/S

28-Mar-25

4:50:00 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:50:00 PM

8

1366.50

TQEX

GENMAB A/S

28-Mar-25

4:50:14 PM

25

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:50:14 PM

5

1366.50

TQEX

GENMAB A/S

28-Mar-25

4:50:19 PM

6

1366.50

TQEX

GENMAB A/S

28-Mar-25

4:50:19 PM

4

1366.50

TQEX

GENMAB A/S

28-Mar-25

4:50:24 PM

5

1366.50

TQEX

GENMAB A/S

28-Mar-25

4:50:47 PM

1

1366.00

AQEU

GENMAB A/S

28-Mar-25

4:50:52 PM

1

1366.00

AQEU

GENMAB A/S

28-Mar-25

4:50:57 PM

10

1366.00

AQEU

GENMAB A/S

28-Mar-25

4:50:57 PM

5

1366.00

AQEU

GENMAB A/S

28-Mar-25

4:50:57 PM

16

1366.00

AQEU

GENMAB A/S

28-Mar-25

4:50:57 PM

1

1366.00

AQEU

GENMAB A/S

28-Mar-25

4:51:07 PM

42

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:51:07 PM

33

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:51:07 PM

24

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:51:07 PM

11

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:51:08 PM

2

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:51:08 PM

33

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:51:09 PM

101

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:51:09 PM

51

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:51:10 PM

12

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:51:10 PM

35

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:51:11 PM

13

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:51:11 PM

26

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:51:11 PM

30

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:51:12 PM

1

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:51:27 PM

45

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:51:27 PM

22

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:51:32 PM

12

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:51:32 PM

21

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:51:47 PM

70

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:52:07 PM

4

1365.00

XCSE

GENMAB A/S

28-Mar-25

4:52:10 PM

12

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:52:10 PM

35

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:52:10 PM

13

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:52:10 PM

10

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:52:10 PM

31

1366.00

CEUX

GENMAB A/S

28-Mar-25

4:52:34 PM

100

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:52:34 PM

11

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:52:34 PM

9

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:52:55 PM

5

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:52:57 PM

8

1365.00

CEUX

GENMAB A/S

28-Mar-25

4:52:57 PM

6

1365.50

CEUX

208


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:52:58 PM

53

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:52:58 PM

18

1365.00

AQEU

GENMAB A/S

28-Mar-25

4:52:59 PM

5

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:52:59 PM

5

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:02 PM

11

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:19 PM

10

1365.00

AQEU

GENMAB A/S

28-Mar-25

4:53:26 PM

36

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:27 PM

13

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:53:27 PM

3

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:53:27 PM

85

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:53:27 PM

6

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:27 PM

5

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:27 PM

6

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:27 PM

42

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:27 PM

2

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:53:27 PM

3

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:53:27 PM

3

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:53:27 PM

12

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:53:27 PM

2

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:53:28 PM

12

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:28 PM

62

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:28 PM

5

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:53:28 PM

22

1365.50

TQEX

GENMAB A/S

28-Mar-25

4:53:29 PM

6

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:53:38 PM

8

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:53:41 PM

42

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:53:41 PM

42

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:53:41 PM

6

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:53:41 PM

6

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:53:41 PM

5

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:53:51 PM

42

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:53:51 PM

6

1366.50

CEUX

GENMAB A/S

28-Mar-25

4:53:55 PM

101

1366.00

XCSE

GENMAB A/S

28-Mar-25

4:53:55 PM

33

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:53:55 PM

30

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:53:55 PM

7

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:53:55 PM

4

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:53:55 PM

5

1366.00

TQEX

GENMAB A/S

28-Mar-25

4:54:02 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:02 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:03 PM

26

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:03 PM

64

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:03 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:04 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:04 PM

12

1366.50

XCSE

209


Exhibit 99.1(a)

APPENDIX Share buy-back programme - Specification for March 26 – March 28, 2025

Graphic

GENMAB A/S

28-Mar-25

4:54:04 PM

30

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:04 PM

6

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:04 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:04 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:05 PM

55

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:07 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:07 PM

53

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:07 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:14 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:14 PM

53

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:14 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:15 PM

100

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:15 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:15 PM

13

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:15 PM

53

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:19 PM

100

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:33 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:40 PM

1

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:40 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:40 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:40 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:40 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:40 PM

12

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:40 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:41 PM

11

1366.50

XCSE

GENMAB A/S

28-Mar-25

4:54:45 PM

25

1365.50

CEUX

GENMAB A/S

28-Mar-25

4:54:51 PM

20

1365.50

AQEU

GENMAB A/S

28-Mar-25

4:54:56 PM

23

1365.50

XCSE

GENMAB A/S

28-Mar-25

4:54:58 PM

21

1365.50

XCSE

210