Costar Group, INC Form 4 insider transactions

Andrew C Florance, Founder and CEO and a Director of Costar Group, Inc., purchased 83,300 shares of common stock on August 4, 2026 for $29.89 per share.

Robin Jack Rossmann, Chief Financial Officer of Costar Group, Inc., received 34,771 shares of common stock on July 31, 2026.

Cynthia Cammett Cann, Chief Accounting Officer of Costar Group, Inc., reported multiple transactions in common stock on July 31, 2026.

Frederick G. Saint, President, Marketplaces of Costar Group, Inc., reported a transaction in 1,436 shares of common stock on August 1, 2026.

Christian Lown, Chief Financial Officer of CoStar Group, Inc., reported a sale of 5,597 shares of common stock on July 1, 2026.

Rachel C. Glaser, a Director at CoStar Group, Inc., acquired 8,262 shares of common stock on June 23, 2026, as detailed in a Form 4 filing.

Director John Berisford acquired 8,262 shares of COSTAR GROUP, INC. common stock through a restricted stock award.

John Hill, a Director at COSTAR GROUP, Inc., reported the acquisition of 8,262 shares of common stock on June 23, 2026.

Angelique G. Brunner, a Director at COSTAR GROUP, INC., reported the acquisition of 8,262 shares of common stock on June 23, 2026.

Robert W. Musslewhite, a Director at CoStar Group, Inc., reported the acquisition of 8,262 shares of common stock on June 23, 2026.

Louise S. Sams, a Director at COSTAR GROUP, INC. (CSGP), acquired 8,262 shares of common stock on June 23, 2026.

Christine McCarthy, a Director at CoStar Group, Inc., reported transactions involving the acquisition and disposition of common stock.

Chief Accounting Officer Cynthia Cammett disposed of 461 shares of CoStar Group common stock to cover tax obligations.

Andrew C. Florance, President and CEO of CoStar Group, Inc., reported transactions involving the acquisition of company stock.

CoStar Group's General Counsel, Gene Boxer, filed an amended Form 4 to correct an administrative error regarding a disposition of 482 common shares.

CoStar Group's Senior VP of Global Operations, Lisa Ruggles, disposed of 2,977 shares of common stock to cover tax withholding obligations.

CoStar Group's General Counsel, Gene Boxer, disposed of 428 shares of common stock to cover tax withholding obligations.

CoStar Group's Chief Technology Officer, Frank Simuro, disposed of 11,107 shares of common stock to cover tax liabilities, reducing his direct beneficial ownership to 414,491 shares.

CoStar Group's Chief Human Resources Officer and Director, Michael J. Desmarais, disposed of 2,873 shares of common stock to cover tax withholding obligations.

CoStar Group's Chief Accounting Officer, Cynthia Cammett Cann, disposed of 1,194 shares of common stock to cover tax obligations.

CoStar Group's Chief Financial Officer, Christian M. Lown, reported the acquisition of 39,652 restricted stock units and the disposition of 7,175 shares for tax withholding purposes.

CoStar Group's President of Marketplaces, Frederick G. Saint, was granted 39,652 restricted stock units, vesting over three years.

CoStar Group's President and CEO, Andrew C. Florance, acquired 83,708 restricted stock units and disposed of 59,593 common shares for tax obligations.

CoStar Group's General Counsel, Gene Boxer, reported the acquisition of 26,888 restricted stock units and the disposition of 4,547 common shares for tax withholding.

CoStar Group's Chief Human Resources Officer, Michael J. Desmarais, reported the acquisition of 17,926 restricted stock units and the disposition of 6,353 common shares for tax purposes.

CoStar Group's Chief Accounting Officer, Cynthia Cann, reported the acquisition of 6,834 restricted stock units and the disposition of 1,385 common shares.

CoStar Group's Senior VP of Global Operations, Lisa Ruggles, acquired 28,197 restricted stock units and disposed of 8,931 common shares for tax purposes.

CoStar Group's Chief Technology Officer, Frank Simuro, reported the acquisition of 52,869 restricted stock units and the disposition of 18,702 common shares for tax purposes.

CoStar Group's President and CEO, Andrew C. Florance, acquired 55,720 shares of common stock at an average price of $44.52 per share.

CoStar Group's Chief Technology Officer, Frank Simuro, reported a forfeiture of performance-based restricted stock and a tax-related disposition of shares.