Arlington, Virginia-based CoStar Group, Inc. (CSGP) provides information, analytics, and online marketplace services to real estate and related business communities in the United States and internationally. The company has a market cap of $12.7 billion and a wide array of digital service offerings, including leasing and selling marketplaces, sales comparable information, decision support, contact management, tenant information, and more.
CoStar Group shares have lagged behind the broader market over the past year, declining 64.7% compared to the S&P 500 Index’s ($SPX) 19.3% surge. Moreover, in 2026, the stock has fallen nearly 53.3%, underperforming the SPX’s 12.4% rise as well.
