Historical annual and monthly returns for Costco (COST).
For Costco (COST), the strongest completed calendar year was 2021, when the stock returned 51.8%, while its weakest was 2002, with a return of -36.8%. Across the 26 completed calendar years from 2000 through 2025, its average annual return was 16.1% and its compounded annual return was 13.7%. COST posted positive returns in 21 of those 26 years (81%). In 2025, the latest completed year, it returned -5.4%. In 2026 year to date, COST has returned 7.5%.
Returns are calculated from the adjusted daily closing prices for Costco (COST). 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.
