MRNA'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.
1 one-day changes above ±100% are withheld for price review.
Biggest one-day falls
Of these 9, 4 were higher 21 sessions later · n = 9 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 20 Aug 2026 | -23.5% | +7.1% | +29.5% | pending |
| 1 Aug 2024 | -21.0% | -10.5% | -17.8% | -41.9% |
| 4 Nov 2021 | -17.9% | -20.5% | -6.6% | -42.6% |
| 22 Oct 2026 | -17.6% | +9.9% | pending | pending |
| 13 Jan 2025 | -16.8% | +2.1% | -13.1% | -23.8% |
| 5 Nov 2021 | -16.6% | -2.4% | +19.1% | -32.4% |
| 11 Aug 2021 | -15.6% | +3.5% | +16.6% | -38.5% |
| 6 Dec 2021 | -13.5% | +2.5% | -18.9% | -51.3% |
| 12 Sep 2024 | -12.4% | -2.4% | -16.3% | -38.5% |
| 6 May 2025 | -12.2% | +4.3% | +6.9% | +9.3% |
Biggest one-day rises
Of these 10, 4 were higher 21 sessions later · n = 10 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 26 Nov 2021 | +20.6% | -7.0% | -26.8% | -53.4% |
| 13 Dec 2022 | +19.6% | +1.8% | -2.8% | -23.2% |
| 9 Aug 2021 | +17.1% | -22.8% | -12.7% | -51.1% |
| 13 Jan 2026 | +17.0% | +25.8% | +1.3% | +37.0% |
| 4 Mar 2026 | +16.0% | -3.2% | -14.9% | -15.1% |
| 3 Aug 2022 | +16.0% | -6.6% | -25.5% | -17.1% |
| 5 Mar 2025 | +15.9% | -0.6% | -26.9% | -22.6% |
| 21 Jan 2026 | +15.8% | -9.1% | +0.1% | +11.6% |
| 24 Feb 2022 | +15.1% | -9.4% | +6.2% | -16.2% |
| 25 Aug 2026 | +14.4% | -2.9% | +22.6% | pending |