COSTAR GROUP, INC. (CSGP) · Insider Trading (Form 4) SEC Filing

=== 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: McCarthy Christine M CIK: 0001332169 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: 11,585 | 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. [F2] This amount includes shares that were inadvertently omitted from the insider's prior filing. --- 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. F2: This amount includes shares that were inadvertently omitted from the insider's prior filing. --- Signature --- /s/ /s/ Gene Boxer, Attorney-in-Fact (2026-06-24)