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COSTAR GROUP, INC. Director's Dealing 2025

Feb 24, 2025

30100_dirs_2025-02-24_cd1b8802-68da-47bb-bbc9-4e8fef18d5be.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP, INC. (CSGP)
CIK: 0001057352
Period of Report: 2025-02-20

Reporting Person: LOWN CHRISTIAN M. (Chief Financial Officer)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2025-02-20 Common Stock, par value $0.01 per share A 97600 Acquired 134823 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2025-02-20 Option to Acquire Common Stock $78.33 A 24600 Acquired 2035-02-19 Common Stock (24600) Direct

Footnotes

F1: Includes a grant of 47,200 shares of restricted common stock that vest in three equal installments on March 1, 2026, March 1, 2027 and March 1, 2028, and a grant of 50,400 shares of restricted
common stock that vest based upon CoStar Group, Inc.'s achievement of a three-year performance goal.

F2: A historical Form 3 filed on behalf of the Reporting Person underreported the Reporting Person's beneficial ownership by an immaterial amount. The Reporting Person's ownership has been corrected on this Form 4.

F3: The option vests in three equal installments on March 1, 2026, March 1, 2027 and March 1, 2028.