IEX'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, 6 were higher 21 sessions later · n = 10 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 30 Jul 2025 | -11.3% | -2.8% | +0.6% | +1.6% |
| 5 Feb 2025 | -9.6% | -2.0% | -5.0% | -8.9% |
| 3 Apr 2025 | -8.0% | -1.0% | +7.7% | +6.7% |
| 1 Aug 2024 | -5.8% | -0.7% | +5.2% | +11.8% |
| 1 Feb 2023 | -5.0% | -1.4% | +0.2% | -7.7% |
| 18 Dec 2024 | -4.7% | +0.6% | +4.3% | -12.3% |
| 2 Feb 2022 | -4.5% | -3.7% | -6.9% | -4.4% |
| 17 Dec 2021 | -4.5% | +2.1% | -5.3% | -13.0% |
| 30 Nov 2021 | -4.2% | +4.7% | +4.8% | -13.8% |
| 18 May 2022 | -4.0% | +2.0% | -4.7% | +20.3% |
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 |
|---|---|---|---|---|
| 9 Apr 2025 | +7.3% | -5.6% | +5.6% | +5.2% |
| 30 Oct 2024 | +7.2% | +7.4% | +5.5% | +0.4% |
| 29 Apr 2026 | +5.8% | +0.4% | -3.0% | +7.6% |
| 4 Feb 2026 | +5.3% | -0.4% | -6.8% | +2.8% |
| 10 Nov 2022 | +5.0% | -0.6% | +3.0% | -2.5% |
| 9 Mar 2022 | +4.7% | +2.2% | +3.5% | +1.6% |
| 21 Nov 2025 | +4.7% | +2.3% | +5.7% | +20.8% |
| 6 Nov 2024 | +4.5% | -1.7% | -2.2% | -16.1% |
| 12 May 2025 | +4.3% | -0.3% | -3.9% | -14.0% |
| 1 Feb 2024 | +4.1% | +2.6% | +7.9% | +0.2% |