Form 4 Filing for COSTAR GROUP, INC.

This filing details a Form 4 submission for COSTAR GROUP, INC. (CSGP) concerning transactions by Christine M. McCarthy. On June 23, 2026, McCarthy acquired 8,262 shares of Common Stock at a price of $0.00 per share under transaction code "A". This acquisition vests fully on the earlier of the first anniversary of the grant date or the Company's 2027 Annual Meeting. Following this transaction, McCarthy now owns 11,585 shares. The filing also notes that a previous filing inadvertently omitted some shares. McCarthy, who is a director at COSTAR GROUP, INC., reported this transaction on June 24, 2026.