Historical annual and monthly returns for CoStar Group (CSGP).
For CoStar Group (CSGP), the strongest completed calendar year was 2003, when the stock returned 126.0%, while its weakest was 2000, with a return of -34.1%. Across the 26 completed calendar years from 2000 through 2025, its average annual return was 17.5% and its compounded annual return was 11.9%. CSGP posted positive returns in 15 of those 26 years (58%). In 2025, the latest completed year, it returned -6.1%. In 2026 year to date, CSGP has returned -58.2%.
Returns are calculated from the adjusted daily closing prices for CoStar Group (CSGP). Annual returns measure the percentage change between the final available trading prices of consecutive calendar years. Monthly returns use the corresponding month-end observations. Adjusted prices account for stock splits and distributions when supplied by the market-data provider. Results are nominal and are not adjusted for inflation.
