Form 4 Filing for COSTAR GROUP, INC. - Officer Stock Acquisition

This filing details a Form 4 submission for COSTAR GROUP, INC. (CSGP) concerning a transaction by Robin Jack Rossmann, Chief Financial Officer. On July 31, 2026, Rossmann acquired 34,771 Restricted Stock Units (RSUs) with a transaction price of $0.00 per share. These RSUs represent a contingent right to receive one share of CoStar Group, Inc. common stock. The RSUs are set to vest in three equal installments on August 1, 2027, August 1, 2028, and August 1, 2029. Following this transaction, Rossmann owns 34,771 shares of common stock. The filing was signed on August 4, 2026, by Gene Boxer, Attorney-in-Fact.