COSTAR GROUP, INC. — Director's Dealing 2026

Feb 23, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP, INC. (CSGP)
CIK: 0001057352
Period of Report: 2026-02-19

Reporting Person: SIMURO FRANK (Chief Technology Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-19	Common Stock, par value $0.01 per share	D	30727	—	Disposed	448721	Direct
2026-02-19	Common Stock, par value $0.01 per share	F	4421	$49.07	Disposed	444300	Direct

Footnotes

F1: Shares forfeited from February 14, 2023 performance restricted stock grant upon certification of actual achievement of the performance goal by the Compensation Committee.

F2: On February 19, 2026, the closing price of the Company's Common Stock on Nasdaq was $49.07.