Historical annual and monthly returns for Merck & Co. (MRK).
For Merck & Co. (MRK), the strongest completed calendar year was 2022, when the stock returned 49.4%, while its weakest was 2008, with a return of -45.3%. Across the 26 completed calendar years from 2000 through 2025, its average annual return was 8.5% and its compounded annual return was 5.7%. MRK posted positive returns in 17 of those 26 years (65%). In 2025, the latest completed year, it returned 9.8%. In 2026 year to date, MRK has returned 44.3%.
Returns are calculated from the adjusted daily closing prices for Merck & Co. (MRK). 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.
