$135.17−$0.80 (-0.59%)as of market close, Aug 18, 2026
☀ Pre-market:$144.54+6.93%8:52 AM ET
MRK monthly returns
Merck & Co. Inc. has averaged 1.07% per month, positive in 57% of months. Month-by-month returns for Merck & Co. Inc. (MRK) below, through August 18, 2026 — the table lists the most recent months; the bar chart plots the last 5 years.
Average month
+1.1%
668 months
Best month
+31.3%
Oct 1974
Worst month
-26.0%
Sep 2004
Positive months
57%
of all months
Merck & Co. Inc. monthly returns#
| Month | Path | Total return |
|---|---|---|
| Aug 2026 | +3.8% | |
| Jul 2026 | +1.1% | |
| Jun 2026 | +8.5% | |
| May 2026 | +8.7% | |
| Apr 2026 | -9.2% | |
| Mar 2026 | -2.1% | |
| Feb 2026 | +12.3% | |
| Jan 2026 | +4.8% | |
| Dec 2025 | +1.3% | |
| Nov 2025 | +21.9% | |
| Oct 2025 | +2.4% | |
| Sep 2025 | +0.8% | |
| Aug 2025 | +7.7% | |
| Jul 2025 | -1.3% | |
| Jun 2025 | +4.0% |
Monthly total return (since Sep 2021)
-20%-10%+0%+10%+20%
20222023202420252026
Methodology#
Monthly returns are total returns (dividends reinvested), computed from MRK's split- and dividend-adjusted month-end closes. The table shows the most recent 120 months and the bar chart the most recent 60. See the year-by-year returns for the annual view. Past performance does not predict future returns; not investment advice.
See also: S&P 500 · Nasdaq-100 · Dow Jones · Russell 2000 · US Bond Market · Gold · Silver · Bitcoin · Ethereum
FAQ#
- What is Merck & Co. Inc.'s average monthly return?
- Merck & Co. Inc. (MRK) has averaged about 1.07% per month, positive in roughly 57% of months. The best month was Oct 1974 (+31.3%) and the worst was Sep 2004 (-26.0%).