AON'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 |
|---|---|---|---|---|
| 31 Aug 2026 | -9.5% | -1.8% | -14.0% | pending |
| 29 Apr 2022 | -9.3% | -0.6% | -4.3% | -2.5% |
| 9 Feb 2026 | -9.3% | +5.0% | +2.1% | +0.6% |
| 25 Apr 2025 | -8.0% | +6.3% | +8.9% | +10.1% |
| 26 Apr 2024 | -6.9% | -1.5% | -1.8% | +12.3% |
| 20 Dec 2023 | -6.0% | -1.6% | +3.5% | +11.3% |
| 14 Dec 2023 | -5.2% | -9.4% | -4.6% | +0.8% |
| 28 Jul 2023 | -5.1% | -1.3% | +3.9% | +0.2% |
| 4 Apr 2025 | -4.7% | +0.1% | -4.5% | -5.4% |
| 9 Jun 2025 | -4.7% | -1.1% | +1.5% | +3.5% |
Biggest one-day rises
Of these 9, 7 were higher 21 sessions later · n = 9 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 26 Jul 2021 | +8.2% | +3.5% | +11.3% | +27.8% |
| 26 Jul 2024 | +8.0% | +2.4% | +4.8% | +10.7% |
| 10 Nov 2022 | +5.4% | -0.2% | +3.8% | +8.6% |
| 4 Feb 2022 | +5.4% | -2.7% | -4.9% | -1.5% |
| 30 Apr 2021 | +5.3% | +2.8% | +0.7% | +3.6% |
| 25 Oct 2024 | +5.2% | -2.8% | +4.0% | -2.1% |
| 9 Mar 2022 | +5.1% | +6.4% | +14.6% | -8.2% |
| 16 Mar 2023 | +4.6% | +1.3% | +10.3% | +10.9% |
| 25 Jul 2025 | +4.6% | -5.2% | -0.5% | -8.5% |
| 4 Nov 2026 | +4.4% | pending | pending | pending |