After an event
Pick an event to see what the market did in the weeks and months after each past time it happened.
Quarterly options expiry (quad witching): what came after
The market here is the average of the US stocks we cover (over US$10B), equal-weighted, not the S&P 500 · 34 times in our prices (2018-05-02 to 2026-10-30) · measured from that day's close
| 2 weeks | 4 weeks | 3 months | |
|---|---|---|---|
| Middle result | +1.0% | +2.8% | +3.3% |
| Share that rose | 71% | 62% | 79% |
| Worst | -9.8% | -7.9% | -28.3% |
| Best | +8.4% | +23.4% | +39.4% |
| Any window | +0.8% · 62% | +1.5% · 65% | +3.8% · 72% |
“Any window”: the middle result and the share that rose over every window of the same length since 2018-05-02, event or not.
Each one (34), newest first
| Date | 2 weeks | 4 weeks | 3 months |
|---|---|---|---|
| 2026-09-18 | -0.7% | -0.3% | — |
| 2026-06-18 | +1.7% | -0.1% | +0.6% |
| 2026-03-20 | +2.8% | +9.0% | +11.6% |
| 2025-12-19 | +2.8% | +3.9% | -0.7% |
| 2025-09-19 | +1.0% | -0.5% | +1.2% |
| 2025-06-20 | +3.8% | +3.9% | +8.5% |
| 2025-03-21 | -9.8% | -7.6% | +5.7% |
| 2024-12-20 | +0.0% | +4.2% | -0.6% |
| 2024-09-20 | +0.9% | +3.0% | +0.1% |
| 2024-06-21 | +0.1% | +3.0% | +7.4% |
| 2024-03-15 | +2.6% | -2.0% | -0.2% |
| 2023-12-15 | +1.0% | -1.2% | +7.3% |
| 2023-09-15 | -3.3% | -4.0% | +7.5% |
| 2023-06-16 | +1.3% | +3.8% | +0.4% |
| 2023-03-17 | +5.4% | +6.0% | +9.0% |
| 2022-12-16 | -0.1% | +3.8% | +1.9% |
| 2022-09-16 | -7.8% | -7.9% | +2.3% |
| 2022-06-17 | +3.6% | +6.2% | +7.4% |
| 2022-03-18 | +1.3% | -1.4% | -17.5% |
| 2021-12-17 | +3.3% | -1.5% | -3.1% |
| 2021-09-17 | -1.6% | +1.5% | +0.8% |
| 2021-06-18 | +3.7% | -0.7% | +4.4% |
| 2021-03-19 | +2.7% | +4.4% | +5.2% |
| 2020-12-18 | -0.2% | +4.2% | +5.1% |
| 2020-09-18 | +1.0% | +5.2% | +17.6% |
| 2020-06-19 | +1.4% | +4.0% | +7.2% |
| 2020-03-20 | +8.4% | +23.4% | +39.4% |
| 2019-12-20 | +0.3% | +2.7% | -28.3% |
| 2019-09-20 | -2.0% | -0.8% | +5.8% |
| 2019-06-21 | +1.0% | +1.3% | +1.4% |
| 2019-03-15 | +0.5% | +3.7% | +2.7% |
| 2018-12-21 | +6.7% | +10.0% | +18.1% |
| 2018-09-21 | -2.4% | -6.7% | -17.6% |
| 2018-06-15 | -2.1% | +0.0% | +3.3% |
- What happened after past ones, not what will happen after the next one.
- The windows overlap: most longer windows hold the next one, so those figures are not separate readings.
- Dates: third Friday of Mar/Jun/Sep/Dec, the session before when the market is shut, checked 2026-11-07. Source