CMCSA'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, 4 were higher 21 sessions later · n = 10 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 24 Apr 2026 | -12.9% | -1.3% | -8.7% | -17.3% |
| 30 Jan 2025 | -11.0% | +3.7% | +8.2% | +2.6% |
| 9 Dec 2024 | -9.5% | -0.5% | -6.1% | -10.4% |
| 28 Jul 2022 | -9.1% | -1.2% | -6.6% | -19.4% |
| 26 Oct 2023 | -8.4% | +8.6% | +7.5% | +18.6% |
| 14 Sep 2021 | -7.3% | +0.8% | -4.8% | -13.8% |
| 23 Jul 2026 | -6.8% | +8.0% | +22.5% | +0.7% |
| 9 Sep 2026 | -6.6% | -3.5% | -13.7% | pending |
| 4 Apr 2025 | -6.6% | +1.0% | +3.3% | +8.8% |
| 13 Sep 2022 | -6.2% | +1.1% | -13.5% | +10.1% |
Biggest one-day rises
Of these 9, 3 were higher 21 sessions later · n = 9 · could be chance.
| Date | One-day change | After 5 sessions | After 21 sessions | After 63 sessions |
|---|---|---|---|---|
| 27 Apr 2023 | +10.3% | -0.1% | -2.0% | +13.1% |
| 23 Apr 2026 | +7.7% | -14.5% | -20.3% | -29.5% |
| 9 Apr 2025 | +7.1% | -4.6% | -2.6% | +0.4% |
| 28 Jul 2026 | +6.1% | +3.1% | +12.4% | -8.8% |
| 6 Nov 2024 | +6.1% | -2.7% | -4.4% | -23.0% |
| 27 Jul 2023 | +5.7% | -0.4% | +0.3% | -5.1% |
| 16 Dec 2025 | +5.4% | -1.2% | -0.2% | +4.0% |
| 13 Oct 2022 | +5.4% | +0.8% | +12.5% | +29.8% |
| 4 Nov 2026 | +5.0% | pending | pending | pending |
| 2 Dec 2021 | +4.9% | -7.2% | -1.5% | -7.9% |