Michael Desmarais Sells COSTAR GROUP, INC. Stock

On March 15, 2026, Michael Desmarais, Chief Human Resources Officer of COSTAR GROUP, INC. (CSGP), sold 2873 shares of common stock (par value $0.01 per share) at a price of $43.63 per share. This transaction was a disposition of shares. Following this transaction, Desmarais owns 87725 shares. The closing price of the Company's common stock on Nasdaq on the preceding business day, March 13, 2026, was also $43.63.