Notice of insider transaction for COSTAR GROUP, INC.

Cynthia Cammett, Chief Accounting Officer of COSTAR GROUP, INC. (CSGP), reported a disposition of 461 shares of common stock on June 15, 2026. The transaction, coded as 'F' (likely a sale or gift), occurred at a price of $32.04 per share. Following this transaction, Ms. Cammett directly owns 24,687 shares of the company's common stock. The filing is Form 4, indicating a change in beneficial ownership by an insider.