AMPH
$25.94-0.77%
Amphastar Pharmaceuticals Inc.Stock · HealthcareRussell 2000 · 0.02% of IWMRussell 3000 · 0.001% of IWVUS Stock Market · 0.0009% of VTI
Amphastar Pharmaceuticals Inc. monthly returns
Amphastar Pharmaceuticals Inc. has averaged 1.24% per month, positive in 49% of months. Month-by-month returns for Amphastar Pharmaceuticals Inc. (AMPH) below, through October 20, 2026 — the table lists the most recent months; the bar chart plots the last 5 years.
Average month
+1.2%
142 months
Best month
+46.2%
Aug 2025
Worst month
-23.6%
Feb 2026
Positive months
49%
of all months
Amphastar Pharmaceuticals Inc. monthly returns#
| Month | Path | Total return |
|---|---|---|
| Oct 2026 | +0.5% | |
| Sep 2026 | +14.6% | |
| Aug 2026 | +13.0% | |
| Jul 2026 | -1.2% | |
| Jun 2026 | +7.1% | |
| May 2026 | -14.2% | |
| Apr 2026 | +12.1% | |
| Mar 2026 | -3.2% | |
| Feb 2026 | -23.6% | |
| Jan 2026 | -1.1% | |
| Dec 2025 | -3.3% | |
| Nov 2025 | +8.6% | |
| Oct 2025 | -4.3% | |
| Sep 2025 | -13.0% | |
| Aug 2025 | +46.2% | |
| Jul 2025 | -8.8% | |
| Jun 2025 | -10.7% | |
| May 2025 | +5.3% | |
| Apr 2025 | -15.8% | |
| Mar 2025 | +2.0% | |
| Feb 2025 | -18.5% | |
| Jan 2025 | -6.1% | |
| Dec 2024 | -17.8% | |
| Nov 2024 | -10.6% | |
| Oct 2024 | +4.1% | |
| Sep 2024 | -0.4% | |
| Aug 2024 | +12.0% | |
| Jul 2024 | +8.8% | |
| Jun 2024 | -5.5% | |
| May 2024 | +2.6% | |
| Apr 2024 | -6.1% | |
| Mar 2024 | -5.7% | |
| Feb 2024 | -12.7% | |
| Jan 2024 | -13.7% | |
| Dec 2023 | +9.8% | |
| Nov 2023 | +24.4% | |
| Oct 2023 | -1.6% | |
| Sep 2023 | -13.7% | |
| Aug 2023 | -12.2% | |
| Jul 2023 | +5.6% | |
| Jun 2023 | +29.5% | |
| May 2023 | +24.0% | |
| Apr 2023 | -4.6% | |
| Mar 2023 | +17.7% | |
| Feb 2023 | +5.3% | |
| Jan 2023 | +8.0% | |
| Dec 2022 | -5.0% | |
| Nov 2022 | -4.6% | |
| Oct 2022 | +10.0% | |
| Sep 2022 | -5.1% | |
| Aug 2022 | -20.8% | |
| Jul 2022 | +7.5% | |
| Jun 2022 | -6.3% | |
| May 2022 | +4.7% | |
| Apr 2022 | -1.2% | |
| Mar 2022 | +29.6% | |
| Feb 2022 | +20.0% | |
| Jan 2022 | -0.9% | |
| Dec 2021 | +19.1% | |
| Nov 2021 | +4.7% | |
| Oct 2021 | -1.7% | |
| Sep 2021 | -3.3% | |
| Aug 2021 | -6.2% | |
| Jul 2021 | +3.9% | |
| Jun 2021 | +6.6% | |
| May 2021 | +8.7% | |
| Apr 2021 | -5.0% | |
| Mar 2021 | +4.5% | |
| Feb 2021 | -3.6% | |
| Jan 2021 | -9.6% | |
| Dec 2020 | +13.2% | |
| Nov 2020 | -9.3% | |
| Oct 2020 | +4.5% | |
| Sep 2020 | -8.0% | |
| Aug 2020 | +1.8% | |
| Jul 2020 | -10.9% | |
| Jun 2020 | +20.5% | |
| May 2020 | +10.0% | |
| Apr 2020 | +14.2% | |
| Mar 2020 | -3.6% | |
| Feb 2020 | -18.6% | |
| Jan 2020 | -2.0% | |
| Dec 2019 | -1.1% | |
| Nov 2019 | +1.0% | |
| Oct 2019 | -2.6% | |
| Sep 2019 | -11.7% | |
| Aug 2019 | +11.5% | |
| Jul 2019 | -4.5% | |
| Jun 2019 | +9.7% | |
| May 2019 | -10.8% | |
| Apr 2019 | +5.7% | |
| Mar 2019 | -17.8% | |
| Feb 2019 | +9.2% | |
| Jan 2019 | +14.4% | |
| Dec 2018 | -8.4% | |
| Nov 2018 | +21.0% | |
| Oct 2018 | -6.7% | |
| Sep 2018 | +1.4% | |
| Aug 2018 | +8.8% | |
| Jul 2018 | +14.4% | |
| Jun 2018 | -3.4% | |
| May 2018 | -17.2% | |
| Apr 2018 | +1.8% | |
| Mar 2018 | +2.1% | |
| Feb 2018 | -1.5% | |
| Jan 2018 | -3.1% | |
| Dec 2017 | -1.8% | |
| Nov 2017 | +8.4% | |
| Oct 2017 | +1.1% | |
| Sep 2017 | +11.6% | |
| Aug 2017 | -7.3% | |
| Jul 2017 | -3.2% | |
| Jun 2017 | +4.6% | |
| May 2017 | +13.0% | |
| Apr 2017 | +4.1% | |
| Mar 2017 | -6.3% | |
| Feb 2017 | -1.8% | |
| Jan 2017 | -14.5% | |
| Dec 2016 | -9.1% | |
| Nov 2016 | +11.7% |
Monthly total return (since Nov 2021)#
-40%-20%0%20%40%
Nov 2021+4.7%
Dec 2021+19%
Jan 2022-0.86%2022
Feb 2022+20%
Mar 2022+30%
Apr 2022-1.2%
May 2022+4.7%
Jun 2022-6.3%
Jul 2022+7.5%
Aug 2022-21%
Sep 2022-5.1%
Oct 2022+10.0%
Nov 2022-4.6%
Dec 2022-5.0%
Jan 2023+8.0%2023
Feb 2023+5.3%
Mar 2023+18%
Apr 2023-4.6%
May 2023+24%
Jun 2023+30%
Jul 2023+5.6%
Aug 2023-12%
Sep 2023-14%
Oct 2023-1.6%
Nov 2023+24%
Dec 2023+9.8%
Jan 2024-14%2024
Feb 2024-13%
Mar 2024-5.7%
Apr 2024-6.1%
May 2024+2.6%
Jun 2024-5.5%
Jul 2024+8.8%
Aug 2024+12%
Sep 2024-0.43%
Oct 2024+4.1%
Nov 2024-11%
Dec 2024-18%
Jan 2025-6.1%2025
Feb 2025-18%
Mar 2025+2.0%
Apr 2025-16%
May 2025+5.3%
Jun 2025-11%
Jul 2025-8.8%
Aug 2025+46%
Sep 2025-13%
Oct 2025-4.3%
Nov 2025+8.6%
Dec 2025-3.3%
Jan 2026-1.1%2026
Feb 2026-24%
Mar 2026-3.2%
Apr 2026+12%
May 2026-14%
Jun 2026+7.1%
Jul 2026-1.2%
Aug 2026+13%
Sep 2026+15%
Oct 2026+0.5%
Amphastar Pharmaceuticals Inc. returns by calendar month#
Every month of every year since 2015, one tick per year on a shared scale; the dark bar is the month's average. Total returns, dividends reinvested.
October 2026 so far: +0.50% — 6th of 12 Octobers since 2015 at the last close; the average October returned -0.0%.
| Month | −50%0+50% | Average | Median | Up | Best | Worst |
|---|---|---|---|---|---|---|
| Jan | -3.3% | -2.5% | 25% | +14.4% 2019 | -15.3% 2016 | |
| Feb | -3.6% | -2.7% | 33% | +20.0% 2022 | -23.6% 2026 | |
| Mar | +3.3% | +2.0% | 58% | +29.6% 2022 | -17.8% 2019 | |
| Apr | +0.4% | +0.3% | 50% | +14.2% 2020 | -15.8% 2025 | |
| May | +5.0% | +5.7% | 75% | +27.9% 2016 | -17.2% 2018 | |
| Jun | +5.8% | +5.6% | 67% | +29.5% 2023 | -10.7% 2025 | |
| Jul | +0.4% | -0.4% | 50% | +14.4% 2018 | -10.9% 2020 | |
| Aug | +3.6% | +5.3% | 58% | +46.2% 2025 | -20.8% 2015 | |
| Sep | -3.1% | -4.2% | 25% | +14.6% 2026 | -13.7% 2023 | |
| Oct | -0.0% | -1.6% | 45% | +10.0% 2022 | -6.7% 2018 | |
| Nov | +7.7% | +8.4% | 73% | +29.6% 2015 | -10.6% 2024 | |
| Dec | -1.1% | -3.3% | 27% | +19.1% 2021 | -17.8% 2024 |
Methodology#
Monthly returns are total returns (dividends reinvested), computed from AMPH'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 Amphastar Pharmaceuticals Inc.'s average monthly return?
- Amphastar Pharmaceuticals Inc. (AMPH) has averaged about 1.24% per month, positive in roughly 49% of months. The best month was Aug 2025 (+46.2%) and the worst was Feb 2026 (-23.6%).
More on Amphastar Pharmaceuticals Inc.
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