As of May 2026 CoStar Group has a market cap of โน1.280 Trillion. This makes CoStar Group the world's 1609th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On May 16th, 2026 the market cap of CoStar Group was reported to be: