AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 2. AMENDMENT/MODIFICATION NO. 3. EFFECTIVE DATE P00020 See Block 16C 6. ISSUED BY CODE AS PR-BARDA AS PR-BARDA 200 Independence Ave., s.w. Room 640-G Washington DC 20201 8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code) MERGENT PRODUCT DEVELOPMENT GAITHERSBURG INC. MERGENT PRODUCT DEVELOPMENT GAITHE 00 PROFESSIONAL DR# 100 1 1. CONTRACT ID CODE 4. REQUISITION/PURCHASE REQ. NO. ASP344018 7. ADMINISTERED BY (If other than Item 6) AS PR-BARDA 200 Independence Ave., Room 638-G Washington DC 20201 £L 9A. AMENDMENT OF SOLICITATION NO. 98. DATED (SEE ITEM 11) I PAGE OF PAGES 1 I 4 r· PROJECT NO. (If applicable) s.w. CODE IASPR-BARDA E E 3 G AITHERSBURG MD 208793419 X 10A. MODIFICATION OF CONTRACT/ORDER NO. HHSO100201600030C 108. DATED (SEE ITEM 13) CODE 1365869 FACILITY CODE 09/30/2016 11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS D The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers Dis extended, Dis not extended. Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended , by one of the following methods: (a) By completing Items 8 and 15, and returning copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted ; or (c) By separate letter or electronic communication which indudes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGEMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted , such change may be made by letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified. 12. ACCOUNTING AND APPROPRIATION DATA(lf required) Net Increase: $ 3 0, 0 00, 0 00. 00 2025.Q99BASN.26088 13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIRES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14. CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT ORDER NO. IN ITEM 1 DA. B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b). C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF: X FAR Part 43.103(a) - Bilateral Modifications D. OTHER (Specify type of modification and authority) E. IMPORTANT: Contractor Dis not Iii] is required to sign this document and return 1 copies to the issuing office. 14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.) Tax ID Number: [**] UEI: CNPVCR8DK7M8 The purpose of this modification is to Exercise CLIN 00llE. ARTICLES 8.3 OPTION PRICES, 8.5. ADVANCE UNDERSTANDINGS, ARTICLE C.l. STATEMENT OF WORK, and SECTION J- LIST OF ATTACHMENTS are revised. Funds Obligated Pior to this Modification: Funded via Mod #20: Total Funds Obligated to Date: Continued ... $[**] $[**] $[**] Except as provided herein, all terms and conditions of the document referenced in Item 9 A or 1 DA, as heretofore changed, remains unchanged and in full force and effect . 15A. NAME AND TITLE OF SIGNER (Type or print) 16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print) Paul Williams SVP, Products Business 158. CONTRACTOR/OFFEROR ,,..., ,.,,,..,,,,,,, Ele ctronically signed by: Paul Williams C "l� r .. Reason:lapprovethisdocument Date: Aug 29, 2025 09:27:55 EDT (Signature of person authorized to sign) Previous edition unusable 15C. DATE SIGNED 08/29/2025 YIFAN YANG 16C.PATE SIGNED Digitally sighed by Yitan Yang -5 Date: 202s.11s.29 17:05:40 -04'00' STANDARD FORM 30 (REV. 11/2016) Prescribed by GSA FAR (48 CFR) 53.243 Certain identified information has been excluded from this exhibit because it is both (i) not material and (ii) is the type of information that the registrant treats as private or confidential. Double asterisks denote omissions.

REFERENCE NO. OF DOCUMENT BEING CONTINUED CONTINUATION SHEET HHSO100201600030C/P00020 NAME OF OFFEROR OR CONTRACTOR EMERGENT PRODUCT DEVELOPMENT GAITHERSBURG INC. 1365869 ITEM NO. SUPPLIES/SERVICES (A) 15 (BJ All other terms and conditions remain unchanged. OTA: N Appr. Yr.: 2025 CAN: Q99BASN Object Class: 26088 Period of Performance: 09/30/2016 to 09/29/2026 Add Item 15 as follows: CLIN 00llE Additional Surge Capacity (Li censure) Obligated Amount: $[**] NSN 7540-01-152-8067 QUANTITY UNIT UNIT PRICE (C) (D) (E) OF 4 AMOUNT (F) [**] OPTIONAL FORM 336 (4-86) Sponsored by GSA FAR (48 CFR) 53.110

HHS0100201600030C P00020 Page 3 of 4 The purpose of this modification is to modify ARTICLES B.3 OPTION PRICES, B.5. ADVANCE UNDERSTANDINGS, ARTICLE C.l. STATEMENT OF WORK, and SECTION J- LIST OF ATTACHMENTS ARTICLE B.3. OPTION PRICES - CUN 0011 is modified as follows: CLIN Period of Supplies/ Estimated Performance Services Doses 0011E 08/29/2025 Additional [**] Total Not to Exceed Cost $[**] (Funded) **(Option through Surge Quantity) 3/31/2026 Capacity (Licensure) [**] Price per Dose $[**] ([**] months from date of manufacture) $[**] ([**] months from date of manufacture) *Under CLIN 00llE a total of [**] estimated doses are expected to be procured at the unit prices stated above. Each vial contains [**] doses; a credit will be issued on the final invoice for any doses delivered above $[**]. The exact quantity within each pricing tier is subject to change depending on timing of delivery. ** Delivery of Doses supplied under CUN 0011E shall not occur prior to October 1, 2025. ARTICLE B.5. ADVANCE UNDERSTANDINGS - is modified as follows: p. CUN 0011E • For CUN 0011E, BARDA agrees to receiving doses that are more than [**] months but not exceeding [**] months from their date of manufacture (Reduced Shelf-Life Doses). • These anthrax vaccine doses will have two different unit prices depending on the age of the vaccine post-manufacture. Vaccine doses delivered up to or equal to [**] months from their manufacture date will be charged a dose price of $[**] per dose. Vaccines delivered with a reduced shelf life greater than [**] months, but less than or equal to [**] months post-manufacture will be charged a unit dose price of $[**] per dose. The following table is provided as an estimate of doses to be delivered under CUN 0llE but subject to change: Product Base Doses Period of Performance [**] months from date of manufacture Reduced Shelf-Life Estimated Quantity for Delivery [**] 0 Doses End of Modification #20 [**] months but [**] months from date of manufacture

HHSO100201600030C P00020 Page 4 of 4 SECTION C DESCRIPTION/SPECIFICATIONS/WORK STATEMENT ARTICLE C.1. STATEMENT OF WORK is modified as follows: Independently and not as an agent of the Government, the Contractor shall furnish all necessary services, qualified personnel, material, equipment, and facilities not otherwise provided by the Government as needed to perform the Statement of Work dated August 2025, set forth in SECTION J List of Attachments, attached hereto and incorporated into this Prime Contract. SECTION J LIST OF ATTACHMENTS is modified as follows: 1. Statement of Work, dated August 2025, 10 pages