Welcome to our dedicated page for Costar Group SEC filings (Ticker: CSGP), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
CoStar Group filings document the regulatory record of a Delaware operating company that provides online real estate marketplaces, information, analytics, and 3D digital twin technology. Its 8-K reports commonly furnish quarterly and annual operating results, Regulation FD disclosures, investor presentation channels, and material corporate events tied to its property-market data and marketplace business.
Proxy and governance filings cover annual meeting matters, board composition, executive compensation arrangements, severance plans, and related employment agreements. Recent filings also document completed acquisition activity, capital actions, and formal disclosures connected to CoStar Group’s corporate structure and public-company governance.
CoStar Group, Inc. reported that President and CEO Andrew C. Florance acquired 124,162 shares of common stock through an equity award. Under a Management Stock Purchase Plan, his annual cash incentive was converted into Deferred Stock Units at $46.34 per unit, and he received Restricted Stock Units for an equal number of shares that vest in full after four years. Following this grant, he directly holds 1,651,435.03 shares of CoStar common stock, reflecting a sizable, compensation-related increase rather than an open-market purchase.
CoStar Group’s Chief Financial Officer Christian M. Lown received an equity compensation award tied to his annual incentive. On March 10, 2026, he was granted 12,268 shares of common stock at no cash cost to him, recorded as a grant or award acquisition. According to the company’s Management Stock Purchase Plan, all or part of his annual cash incentive was converted into Deferred Stock Units at $46.34 per unit, and he was awarded an equal number of Restricted Stock Units that vest in full after four years. Following this grant, Lown directly holds 135,250 shares of CoStar Group common stock.
CoStar Group’s General Counsel and Secretary, Gene Boxer, received a stock-based compensation award. On March 10, 2026, he acquired 21,920 shares of CoStar Group common stock at a stated price of $0.00 per share, bringing his direct holdings to 95,945 shares.
According to the footnote, under the Management Stock Purchase Plan, all or part of his annual cash incentive was converted into Deferred Stock Units at $46.34 per unit, and the company granted an equal number of Restricted Stock Units that vest in full after four years. This is a compensation-related, non-market transaction rather than an open-market purchase or sale.
CoStar Group’s Chief Human Resources Officer, Michael J. Desmarais, received a grant of 17,676 shares of common stock as reported on a Form 4. These shares were acquired at a reported price of $0.00 per share, reflecting a compensation-related award rather than a market purchase.
According to the footnote, a portion of his annual cash incentive was converted into Deferred Stock Units at $46.34 per unit, and he was also awarded an equal number of Restricted Stock Units that vest in full after four years. Following this award, Desmarais directly owns 90,598 shares of CoStar Group common stock.
CoStar Group director buys additional shares. Louise S. Sams, a director of CoStar Group, Inc., purchased 1000 shares of common stock in an open-market transaction at a price of $48.3600 per share. Following this purchase, Sams directly holds a total of 20409 CoStar Group shares.
CoStar Group Chief Financial Officer Christian M. Lown reported a mix of equity award and tax-related share disposition. He received 39,652 restricted stock units, each equal to one CoStar common share, vesting in three equal installments on March 1 of 2027, 2028, and 2029. To cover tax withholding, 7,175 common shares were disposed of at $44.63 per share, leaving him with 122,982 common shares held directly.
SAINT FREDERICK G. reported acquisition or exercise transactions in this Form 4 filing.
CoStar Group reported that Frederick G. Saint, President, Marketplaces, received a grant of 39,652 restricted stock units. Each unit represents a contingent right to receive one share of CoStar Group common stock. The units vest in three equal installments on March 1, 2027, March 1, 2028, and March 1, 2029.
CoStar Group President and CEO Andrew C. Florance reported a mix of equity compensation events. He received a grant of 83,708 restricted stock units on February 27, 2026, each representing a contingent right to one share of CoStar Group common stock. These units vest in three equal installments on March 1, 2027, March 1, 2028, and March 1, 2029.
On March 1, 2026, 59,593 shares of common stock were disposed of at $44.63 per share in a tax-withholding transaction to cover obligations associated with equity awards. After this disposition, he directly owned 1,527,273.03 shares of common stock, in addition to the 83,708 restricted stock units.
CoStar Group General Counsel and Secretary Gene Boxer reported two equity-related transactions. He received 26,888 restricted stock units on February 27, 2026, each representing one share of common stock. These RSUs vest in three equal installments on March 1, 2027, 2028 and 2029.
On March 1, 2026, Boxer had 4,547 shares of common stock disposed in a tax-withholding transaction at $44.63 per share, corresponding to the prior Nasdaq closing price. After this, he directly owned 74,025 common shares and 26,888 RSUs.
CoStar Group Chief Human Resources Officer Michael J. Desmarais reported routine equity compensation activity. He received a grant of 17,926 restricted stock units, each representing one future share of CoStar Group common stock. The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028, and March 1, 2029.
To cover tax obligations, 6,353 shares of common stock were disposed of at a price of $44.63 per share through a tax-withholding transaction rather than an open-market sale. Following these transactions, Desmarais directly held 72,922 shares of CoStar Group common stock.