ChartRow logo
Sign in
Share this page
MRK
$144.30+0.34%
as of close, Oct 2, 2026
☾ AH $144.30 +0.34%
Merck & Co. Inc.Stock · HealthcareDow Jones 1.5%S&P 500 0.5%Russell 1000 0.5%US Stock Market 0.4%Russell 3000 0.4%MSCI World 0.3%MSCI ACWI 0.3%S&P 500 Equal Weight 0.2%
PeersMRNALLYUNHJNJTMOAMGN
Annual returnsBy monthBy weekTrailing

Merck & Co. Inc. monthly returns

Merck & Co. Inc. has averaged 1.08% per month, positive in 57% of months. Month-by-month returns for Merck & Co. Inc. (MRK) below, through October 2, 2026 — the table lists the most recent months; the bar chart plots the last 5 years.

Average month
+1.1%
670 months
Best month
+31.4%
Oct 1974
Worst month
-26.0%
Sep 2004
Positive months
57%
of all months

Merck & Co. Inc. monthly returns#

Merck & Co. Inc. total return by month
MonthTotal return
Oct 2026
-0.7%
Sep 2026
-1.1%
Aug 2026
+13.5%
Jul 2026
+1.1%
Jun 2026
+9.3%
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
+4.1%
May 2025
-9.8%
Apr 2025
-5.1%
Mar 2025
-1.9%
Feb 2025
-6.6%
Jan 2025
-0.7%
Dec 2024
-1.3%
Nov 2024
-0.7%
Oct 2024
-9.9%
Sep 2024
-3.5%
Aug 2024
+4.7%
Jul 2024
-8.6%
Jun 2024
-0.8%
May 2024
-2.8%
Apr 2024
-2.1%
Mar 2024
+4.4%
Feb 2024
+5.3%
Jan 2024
+10.8%
Dec 2023
+7.2%
Nov 2023
-0.2%
Oct 2023
-0.2%
Sep 2023
-4.9%
Aug 2023
+2.2%
Jul 2023
-7.6%
Jun 2023
+5.2%
May 2023
-4.4%
Apr 2023
+8.5%
Mar 2023
+0.8%
Feb 2023
-1.1%
Jan 2023
-3.2%
Dec 2022
+1.4%
Nov 2022
+8.8%
Oct 2022
+17.5%
Sep 2022
+1.7%
Aug 2022
-4.5%
Jul 2022
-2.0%
Jun 2022
-0.1%
May 2022
+3.8%
Apr 2022
+8.1%
Mar 2022
+8.1%
Feb 2022
-6.0%
Jan 2022
+6.3%
Dec 2021
+3.3%
Nov 2021
-14.9%
Oct 2021
+17.2%
Sep 2021
-0.7%
Aug 2021
-0.8%
Jul 2021
-1.2%
Jun 2021
+8.3%
May 2021
+1.9%
Apr 2021
-3.4%
Mar 2021
+7.1%
Feb 2021
-5.8%
Jan 2021
-5.8%
Dec 2020
+2.6%
Nov 2020
+6.9%
Oct 2020
-9.3%
Sep 2020
-2.0%
Aug 2020
+6.3%
Jul 2020
+3.8%
Jun 2020
-3.4%
May 2020
+1.7%
Apr 2020
+3.1%
Mar 2020
+1.3%
Feb 2020
-10.4%
Jan 2020
-6.1%
Dec 2019
+5.0%
Nov 2019
+0.6%
Oct 2019
+2.9%
Sep 2019
-2.0%
Aug 2019
+4.2%
Jul 2019
-1.0%
Jun 2019
+6.6%
May 2019
+0.6%
Apr 2019
-5.4%
Mar 2019
+3.0%
Feb 2019
+9.2%
Jan 2019
-2.6%
Dec 2018
-3.0%
Nov 2018
+7.8%
Oct 2018
+3.8%
Sep 2018
+4.1%
Aug 2018
+4.1%
Jul 2018
+8.5%
Jun 2018
+2.8%
May 2018
+1.1%
Apr 2018
+8.1%
Mar 2018
+1.3%
Feb 2018
-8.5%
Jan 2018
+5.3%
Dec 2017
+2.7%
Nov 2017
+0.3%
Oct 2017
-14.0%
Sep 2017
+1.0%
Aug 2017
-0.0%
Jul 2017
-0.3%
Jun 2017
-0.8%
May 2017
+4.5%
Apr 2017
-1.9%
Mar 2017
-2.8%
Feb 2017
+6.3%
Jan 2017
+5.3%
Dec 2016
-3.1%
Nov 2016
+4.2%

Monthly total return (since Nov 2021)#

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.

FAQ#

What is Merck & Co. Inc.'s average monthly return?
Merck & Co. Inc. (MRK) has averaged about 1.08% per month, positive in roughly 57% of months. The best month was Oct 1974 (+31.4%) and the worst was Sep 2004 (-26.0%).

More on Merck & Co. Inc.

Annual returnsBy weekTrailingDrawdown
By month for: S&P 500 · S&P 500 Equal Weight · US Stock Market · Nasdaq-100