CoStar Group

CoStar Group, Inc.
	Headquarters in Arlington, Virginia
Company type	Public
Traded as	Nasdaq: CSGP; Nasdaq-100 component; S&P 500 component;
Industry	Commercial property Residential property Technology company
Founded	1987
Founder	Andrew Florance
Headquarters	Arlington, Virginia, U.S.
Area served	Australia; Canada; France; Germany; Spain; United Kingdom; United States;
Key people	Andrew C. Florance (president and CEO); Louise S. Sams (chairman); Lisa Ruggles (SVP, global operations); Frank Simuro (CTO);
Revenue	US$3.25 billion (2025)
Operating income	US$(72) million (2025)
Net income	US$7 million (2025)
Total assets	US$10.54 billion (2025)
Total equity	US$8.33 billion (2025)
Number of employees	8,400 (2026)
Subsidiaries	Apartments.com; Domain Group; Homes.com; LoopNet; Matterport; STR;
Website	costargroup.com
	Footnotes / references;

CoStar Group, Inc. is an American provider of information, analytics, and marketing services to the commercial property industry in North America and Europe. Founded in 1987 by Andrew C. Florance and based in Arlington, Virginia, the company operates the CoStar online database and news website and several online marketplaces, including Apartments.com and Homes.com.