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Date of Report (Date of earliest event reported): June 26, 2025

Registrant’s telephone number, including area code: (202) 346-6500

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:  

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.     

☐

On June 26, 2025, at the Annual Meeting of Stockholders (the “Annual Meeting”) of CoStar Group, Inc. (the “Company” or “our”), the stockholders of the Company, upon the recommendation of the Board of Directors of the Company (the “Board”), approved the CoStar Group, Inc. 2025 Stock Incentive Plan (the “2025 Plan”), which was approved by the Board on April 28, 2025 (the “Effective Date”), subject to stockholder approval. The 2025 Plan, among other things, permits the grant of stock options, stock appreciation rights, restricted stock and restricted stock units to employees, officers, consultants and directors of the Company and its subsidiaries. The 2025 Plan replaces the CoStar Group, Inc. 2016 Stock Incentive Plan (the “2016 Plan”), and no further grants will be made pursuant to the 2016 Plan. The number of shares of Company common stock that will be available for grant under the 2025 Plan will be the sum of (i) any shares that remained available for grant under the 2016 Plan as of the Effective Date, plus (ii) shares subject to outstanding awards under the 2016 Plan as of the Effective Date that are later forfeited.

A more detailed description of the material terms of the 2025 Plan was included in the Company’s Definitive Proxy Statement on Schedule 14A (“Proxy Statement”) filed with the Securities and Exchange Commission on April 30, 2025. The foregoing and the summary in the Proxy Statement are not complete summaries of the terms of the 2025 Plan and are qualified by reference to the text of the 2025 Plan, which is included as Exhibit 10.1 hereto and is incorporated by reference herein.

The following items, which are more fully described in our Proxy Statement, were submitted to a vote of the stockholders of the Company at the Annual Meeting. The final voting results are as follows:

1.Each of the following nominees were elected to our Board to serve until the Company’s 2026 Annual Meeting of Stockholders or until his or her successor is elected and qualified: Louise S. Sams, Andrew C. Florance, John L. Berisford, Angelique G. Brunner, Rachel C. Glaser, John W. Hill, Christine M. McCarthy, and Robert W. Musslewhite.

2.The appointment of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2025 was ratified upon the following vote:

3.The advisory resolution to approve the Company's executive compensation was approved upon the following vote:

4.     The 2025 Plan was approved upon the following vote:

5.    The stockholder proposal regarding support for transparency in political spending was not approved upon the following vote:

Item 9.01 Financial Statements and Exhibits.

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 hereunto duly authorized.