INDICES
US400
US S&P MidCap 400
How often this market makes each size of move, graded against its own history · to 31 August 2026
Daily moves
| Reading | Times | Share | |
|---|---|---|---|
| Max | 2 | 0.8% | |
| Very High | 4 | 1.5% | |
| High | 8 | 3.1% | |
| Moderate | 19 | 7.3% | |
| Low | 84 | 32.2% | |
| Very Low | 144 | 55.2% |
A Very High or Max day shows up about 3 times a year for US400 — 6 times in the history we hold. The most recent was 8 Apr 2026, when it rose 2.8%.
Biggest moves on record
| When | Move | Reading |
|---|---|---|
| 6 Feb 2026 | +3.1% | Max |
| 10 Oct 2025 | −2.8% | Max |
| 31 Mar 2026 | +2.8% | Very High |
| 8 Apr 2026 | +2.8% | Very High |
| 22 Aug 2025 | +2.7% | High |