Here are the 10-K annual reports from CoStar Group Inc (CSGP) in our archive since June 2025, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 10-K covers the audited annual report, with the full financial statements, so if you follow CSGP and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full CSGP filings page.
CoStar Group is a Delaware-based provider of online real estate marketplaces, data, analytics, and 3D digital twin technology serving commercial and residential property markets worldwide. It operates two segments, Commercial Real Estate and Residential Real Estate, after shifting from geography-based reporting in 2025.
The company has built a large proprietary real estate database over more than 35 years and delivers most services via recurring subscriptions, complemented by transaction-based revenue such as auction fees and 3D capture services. Major brands include CoStar, LoopNet, Apartments.com, Homes.com, Land.com, OnTheMarket, Domain, Matterport, STR, BizBuySell, and Visual Lease.
CoStar expanded through recent acquisitions of Visual Lease in 2024, Matterport in February 2025, and Domain in August 2025, and authorized a stock repurchase program of up to $1.5 billion in CoStar Group Shares in December 2025. As of June 30, 2025, non‑affiliate market value of common stock was about $33.9 billion, and 419,793,301 shares were outstanding as of February 20, 2026. The filing outlines extensive risk factors, including competition, AI-related issues, data protection, acquisitions integration, macroeconomic and real estate cycles, indebtedness, regulatory compliance, and execution of its stock repurchase program.