$135.17−$0.80 (-0.59%)as of market close, Aug 18, 2026
☀ Pre-market:$146.62+8.47%8:01 AM ET
MRK weekly returns
Merck & Co. Inc. has averaged 0.25% per week, positive in 52% of weeks. Week-by-week returns for Merck & Co. Inc. (MRK) below, through August 18, 2026 — the table lists the most recent weeks; the bar chart plots the last 2 years.
Average week
+0.2%
2955 weeks
Best week
+19.0%
Mar 13, 2009
Worst week
-24.5%
Oct 1, 2004
Positive weeks
52%
of all weeks
Merck & Co. Inc. weekly returns#
| Week ending | Path | Total return |
|---|---|---|
| Aug 18, 2026 | -0.5% | |
| Aug 14, 2026 | +5.6% | |
| Aug 7, 2026 | -1.2% | |
| Jul 31, 2026 | -0.7% | |
| Jul 24, 2026 | +2.8% | |
| Jul 17, 2026 | +3.2% | |
| Jul 10, 2026 | -4.6% | |
| Jul 2, 2026 | +0.7% | |
| Jun 26, 2026 | +13.0% | |
| Jun 18, 2026 | -3.7% | |
| Jun 12, 2026 | -2.1% | |
| Jun 5, 2026 | +1.7% | |
| May 29, 2026 | -3.0% | |
| May 22, 2026 | +9.9% | |
| May 15, 2026 | +0.0% |
Weekly total return (since Aug 30, 2024)
-10%-5%+0%+5%+10%
20252026
Methodology#
Weekly returns are total returns (dividends reinvested), computed from MRK's split- and dividend-adjusted weekly (ISO week) closes. The table shows the most recent 260 weeks and the bar chart the most recent 104. 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 weekly return?
- Merck & Co. Inc. (MRK) has averaged about 0.25% per week, positive in roughly 52% of weeks. The best week was Mar 13, 2009 (+19.0%) and the worst was Oct 1, 2004 (-24.5%).