ZS'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 30 Mar 2021 to 4 Nov 2026 (1408 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 |
|---|---|---|---|---|
| 27 May 2026 | -31.5% | +6.3% | +4.6% | +34.7% |
| 4 Sep 2024 | -18.7% | +2.9% | +8.0% | +26.4% |
| 25 Feb 2022 | -15.8% | +1.6% | +7.2% | -35.9% |
| 21 Feb 2024 | -14.1% | +10.9% | -7.4% | -17.3% |
| 26 Nov 2025 | -13.0% | -4.0% | -9.5% | -41.0% |
| 6 Dec 2021 | -12.4% | +12.5% | -4.4% | -27.6% |
| 27 Feb 2026 | -12.2% | +11.6% | -6.6% | -4.9% |
| 9 May 2022 | -11.5% | -8.5% | +8.2% | +6.7% |
| 9 Apr 2026 | -11.3% | +9.9% | +24.5% | +13.9% |
| 3 Mar 2023 | -11.1% | -11.6% | -5.3% | +19.4% |
Biggest one-day rises
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 |
|---|---|---|---|---|
| 9 Sep 2022 | +21.9% | -9.8% | -16.4% | -36.4% |
| 8 May 2023 | +20.6% | +11.9% | +34.3% | +28.5% |
| 14 Sep 2026 | +16.5% | +7.6% | +18.8% | pending |
| 10 Nov 2022 | +14.5% | +2.7% | -8.9% | +0.6% |
| 9 Apr 2025 | +14.2% | +0.4% | +15.3% | +43.4% |
| 27 May 2022 | +12.6% | -0.9% | -3.2% | -0.9% |
| 26 May 2021 | +12.4% | -5.1% | +12.7% | +35.4% |
| 1 Jun 2026 | +11.4% | -17.0% | -5.9% | +21.0% |
| 13 May 2022 | +11.3% | -10.7% | -7.3% | +18.6% |
| 10 Aug 2022 | +10.4% | -3.4% | +4.2% | -33.5% |