ISRG'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, 7 were higher 21 sessions later · n = 10 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 22 Apr 2022 | -14.3% | -5.2% | -12.2% | -13.1% |
| 17 Jul 2026 | -14.1% | -2.3% | +13.0% | +23.9% |
| 4 Apr 2025 | -8.7% | +9.3% | +17.5% | +16.8% |
| 8 Mar 2022 | -8.0% | +0.3% | +7.2% | -17.6% |
| 21 Jan 2022 | -7.9% | +0.8% | +5.4% | -6.4% |
| 9 May 2022 | -7.2% | +5.2% | +4.7% | +11.6% |
| 10 Mar 2025 | -6.9% | +1.3% | -5.2% | +9.0% |
| 14 Jul 2026 | -6.8% | -7.8% | +5.7% | +12.7% |
| 11 May 2026 | -6.7% | +4.7% | -1.9% | -4.5% |
| 10 Apr 2025 | -6.4% | -1.4% | +14.7% | +5.5% |
Biggest one-day rises
Of these 9, 8 were higher 21 sessions later · n = 9 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 9 Apr 2025 | +14.3% | -8.0% | +2.6% | -2.1% |
| 22 Oct 2025 | +13.9% | +2.0% | +4.8% | -0.6% |
| 19 Apr 2023 | +10.9% | -1.2% | +4.6% | +16.4% |
| 10 Jan 2024 | +10.3% | +2.1% | +6.5% | +7.6% |
| 18 Oct 2024 | +10.0% | -1.9% | +2.0% | +17.1% |
| 21 Apr 2021 | +9.9% | -2.5% | -6.6% | +6.0% |
| 4 Nov 2026 | +9.4% | pending | pending | pending |
| 19 Jul 2024 | +9.3% | -3.0% | +6.0% | +4.1% |
| 10 Nov 2022 | +9.2% | +1.1% | +6.2% | -4.9% |
| 19 Oct 2022 | +9.0% | +14.5% | +23.5% | +21.6% |