0001057352 2025-02-28 2025-02-28 false 0001057352 8-K 2025-02-28 COSTAR GROUP, INC. DE 0-24531 52-2091509 1201 Wilson Blvd. Arlington VA 22209 (202) 346-6500 false false false false Common Stock ($0.01 par value) CSGP NASDAQ false