BA'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 5 Apr 2021 to 4 Nov 2026 (1405 sessions). Later changes are measured from the close on the day of the move.
Biggest one-day falls
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 |
|---|---|---|---|---|
| 27 Oct 2026 | -10.7% | +3.1% | pending | pending |
| 3 Apr 2025 | -10.5% | +3.1% | +23.6% | +44.9% |
| 9 May 2022 | -10.5% | -6.9% | +4.7% | +23.7% |
| 4 Apr 2025 | -9.5% | +14.8% | +36.1% | +60.0% |
| 13 Jun 2022 | -8.8% | +18.0% | +27.0% | +27.1% |
| 26 Oct 2022 | -8.8% | +10.2% | +33.3% | +57.8% |
| 8 Jan 2024 | -8.0% | -12.4% | -7.5% | -22.2% |
| 16 Jan 2024 | -7.9% | +5.5% | +1.4% | -14.9% |
| 23 May 2024 | -7.6% | +3.1% | +1.7% | +1.6% |
| 27 Apr 2022 | -7.5% | +1.6% | -17.3% | +3.0% |
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 | +15.4% | -2.7% | +21.2% | +41.1% |
| 2 Dec 2025 | +10.1% | -2.4% | +10.9% | +8.1% |
| 15 Jun 2022 | +9.5% | +0.2% | +10.5% | +12.0% |
| 26 Jul 2023 | +8.7% | -0.6% | -6.7% | -21.7% |
| 3 Aug 2026 | +8.0% | -0.3% | -11.9% | -26.5% |
| 2 Dec 2021 | +7.5% | +2.6% | +2.7% | -10.6% |
| 2 Jun 2022 | +7.5% | -4.8% | -2.0% | +9.4% |
| 12 Jul 2022 | +7.4% | +6.1% | +14.9% | -10.4% |
| 19 Mar 2025 | +6.8% | +3.4% | -6.2% | +14.5% |
| 17 May 2022 | +6.4% | -9.6% | +1.0% | +26.6% |