CSGP ▼ -1.8% - CoStar Group, Inc. $CSGP - Homes.com Shares Most Expensive Home Sales Across Major U.S. Markets in August CoStar Group shares fell 1.8% today despite the company's Homes.com platform reporting on the most expensive home sales across major U.S. markets in August. The decline came on a day when the real estate listings business shared market data, suggesting investor sentiment moved independent of the content announcement. 23-SEP-2026 04:24 PM ET