AMGN's biggest one-day moves since 2021, and what happened next
Describes the past; not a signal. Pre-licensed data — internal estimates, to be re-verified after our licensed data rebuild.
Close-to-close daily changes from 1 Apr 2021 to 4 Nov 2026 (1406 sessions). Later changes are measured from the close on the day of the move.
Biggest one-day falls
Of these 10, 5 were higher 21 sessions later · n = 10 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 8 Sep 2026 | -10.1% | -4.5% | +5.1% | pending |
| 28 Apr 2021 | -7.2% | +5.3% | +0.1% | +3.9% |
| 12 Nov 2024 | -7.1% | -5.6% | -7.6% | -1.0% |
| 4 Aug 2021 | -6.5% | -0.1% | -0.3% | -5.4% |
| 7 Feb 2024 | -6.4% | -2.0% | -6.8% | +4.7% |
| 23 Jun 2025 | -5.8% | +2.5% | +13.5% | +5.0% |
| 25 Sep 2024 | -5.5% | +2.2% | +0.9% | -14.8% |
| 6 Aug 2025 | -5.1% | +1.6% | -0.4% | +4.2% |
| 7 Aug 2024 | -5.0% | +3.3% | +3.3% | +2.9% |
| 4 Apr 2025 | -5.0% | -2.9% | -8.1% | +1.8% |
Biggest one-day rises
Of these 10, 6 were higher 21 sessions later · n = 10 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 3 May 2024 | +11.8% | -0.4% | -0.6% | +5.2% |
| 4 Feb 2026 | +8.2% | +0.1% | +0.9% | -9.6% |
| 8 Feb 2022 | +7.8% | -6.3% | -5.0% | +0.7% |
| 5 Nov 2025 | +7.8% | +5.1% | +3.1% | +20.2% |
| 5 Feb 2025 | +6.5% | -4.1% | +6.4% | -9.7% |
| 1 Oct 2025 | +5.8% | -1.3% | -2.2% | +9.7% |
| 11 Oct 2022 | +5.7% | +2.7% | +18.0% | +12.0% |
| 8 Nov 2022 | +5.5% | -3.0% | -1.7% | -17.4% |
| 4 Aug 2023 | +5.5% | +7.9% | +5.3% | +10.5% |
| 11 Jun 2026 | +4.8% | -4.6% | +0.3% | +6.6% |