0001057352 2025-04-06 2025-04-06 false 0001057352 8-K 2025-04-06 COSTAR GROUP, INC. DE 0-24531 52-2091509 1201 Wilson Blvd. Arlington VA 20009 (202) 346-6500 false false false false Common Stock ($0.01 par value) CSGP NASDAQ false