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. (CSGP) announced completion of its acquisition of Bora, Inc. and its subsidiaries (together, Zonda) for $800 million in cash, adding a leading new home construction data, software and marketplaces platform to its portfolio. Zonda generated about $170 million of revenue in 2025 with a 23% Adjusted EBITDA margin, contributing a scaled, profitable and largely subscription-based business. The deal expands CoStar’s presence in the U.S. new home market, which the company cites at about $400 billion in annual home sales, and brings the NewHomeSource.com and Livabl marketplaces into CoStar’s network.
Management states the acquisition is expected to enhance profitability in the residential segment and support CoStar’s consolidated margin profile while creating long-term growth opportunities across commercial, residential, multifamily, lending and analytics businesses. For the second quarter of 2026, CoStar reported $925 million in revenue, up 18% year-over-year, with Adjusted EBITDA of $184 million, more than double the prior year. Residential revenue was $444 million, up 33%, and the residential segment produced positive Adjusted EBITDA, providing a profitability backdrop as Zonda is integrated.
Baron Capital Group, Inc., BAMCO, Inc., Baron Capital Management, Inc. and Ronald Baron report a significant ownership stake in CoStar Group, Inc. They collectively report beneficial ownership of 21,626,763 shares of CoStar common stock, representing 5.3% of the outstanding class as of June 30, 2026.
All reported shares are held with shared rather than sole power. The group reports 21,369,752 shares with shared voting power and 21,626,763 shares with shared dispositive power, with no sole voting or dispositive power. BAMCO and Baron Capital Management are subsidiaries of Baron Capital Group, and Ronald Baron owns a controlling interest in Baron Capital Group.
The advisory clients of BAMCO and Baron Capital Management have the right to receive dividends or sale proceeds for the CoStar shares held in their accounts, and to the filers’ knowledge, no single client has an interest in more than 5% of the class.
COSTAR GROUP, INC. Chief Accounting Officer Cynthia Cammett Cann reported a sale of 4,788 shares of common stock on 2026-08-07 in an open market or private transaction at $30.78 per share. Following this transaction, she holds 18,822 shares of CoStar Group common stock directly.
CoStar Group, Inc. director John W. Hill reported a sale of 3,500 shares of common stock on 2026-08-05 at $30.21 per share in an open market or private transaction. Following this sale, Hill directly holds 22,993 shares of CoStar Group common stock.
CoStar Group (CSGP) has a notice of proposed sale covering up to 3,500 shares of common stock, with an aggregate market value of $106,067.50, to be sold through Ameritas Investment Corp on or after August 5, 2026 on NASDAQ.
The shares relate to stock issued as payment for services rendered on several dates, including 989 shares on November 1, 2025, 25 shares on September 15, 2025, 922 shares on August 1, 2025, 617 shares on September 15, 2024, and 947 shares on September 14, 2015, all classified as compensation common stock.
CoStar Group, Inc. founder and CEO Andrew C. Florance reported purchasing 83,300 shares of common stock on August 4, 2026 at an average price of $29.89 per share, based on prices ranging from $29.57 to $29.99. After this open-market purchase, he directly holds 1,806,165.03 shares.
Rossmann Robin Jack reported acquisition or exercise transactions in this Form 4 filing.
CoStar Group, Inc. granted Chief Financial Officer Robin Jack Rossmann 34,771 restricted stock units on July 31, 2026. Each unit represents a contingent right to receive one share of common stock. The award vests in three equal installments on August 1, 2027, 2028 and 2029, and Rossmann now directly holds 34,771 RSUs.
CoStar Group, Inc. Chief Accounting Officer Cynthia Cammett received a grant of 26,078 restricted stock units on July 31, 2026, each representing one share of common stock vesting in four equal installments on August 1, 2027, 2028, 2029, and 2030.
On August 1, 2026, 1,077 shares of common stock were withheld at $28.76 per share to satisfy tax obligations, leaving her with 23,610 CoStar common shares held directly, in addition to the new RSU award.
COSTAR GROUP, INC. executive SAINT FREDERICK G., President, Marketplaces, disposed of 1,436 shares of common stock on August 1, 2026. The shares were delivered or withheld to satisfy an exercise price or tax liability at $28.76 per share. After this transaction, he directly holds 278,415 shares of CoStar common stock.
CoStar Group, Inc. reports the initial equity holdings of Chief Financial Officer Robin Jack Rossmann. As of July 31, 2026, he directly owns 86,691 shares of common stock and 10,223 restricted stock units, each RSU representing one share. These RSUs vest in four equal installments on March 15, 2027, March 15, 2028, March 15, 2029 and March 15, 2030.