Costar (CSGP) 4: Musslewhite Robert W bought 8,262 shares of Common Stock, p… (Jun 24, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-23 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: COSTAR GROUP, INC. (CSGP) CIK: 0001057352 --- Reporting Owner --- Name: Musslewhite Robert W CIK: 0001390194 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock, par value $0.01 per share Date: 2026-06-23 | Code: A (Grant or award) Shares: +8,262 | Price: $0.00 Shares Owned After: 26,539 | Ownership: D (Direct) Footnotes: [F1] The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders. --- Footnotes (Complete Index) --- F1: The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders. --- Signature --- /s/ /s/ Gene Boxer, Attorney-in-Fact (2026-06-24)