COSTAR GROUP, INC. — Director's Dealing 2025

Feb 24, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP, INC. (CSGP)
CIK: 0001057352
Period of Report: 2025-02-13

Reporting Person: SIMURO FRANK (Chief Technology Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-02-13	Common Stock, par value $0.01 per share	D	6452	—	Disposed	378567	Direct
2025-02-13	Common Stock, par value $0.01 per share	F	7476	$73.27	Disposed	371091	Direct
2025-02-20	Common Stock, par value $0.01 per share	A	130640	—	Acquired	501731	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	33000	Acquired	2035-02-19	Common Stock (33000)	Direct

Footnotes

F1: Shares forfeited from February 16, 2022 performance restricted stock grant upon certification of actual achievement of the performance goal by the Compensation Committee.

F2: Includes a grant of 63,200 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 67,440 shares of restricted
common stock that vest based upon CoStar Group, Inc.'s achievement of a three-year performance goal.

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