Unusual price movements and significant market activity for HEICO Corporation (HEI). Each move is flagged by Z-score statistical significance — showing when HEI moved beyond its typical daily range. 3 significant moves detected in the last 30 days.
Current Market State
What May Be Driving HEI?
No specific catalyst has been identified in the available market data for HEICO Corporation (HEI). The moves shown below are flagged based on statistical significance (Z-score ≥ 2), meaning HEI moved beyond its typical daily range. A catalyst may exist — such as earnings, analyst action, sector momentum, or news — but has not yet been tagged to this ticker.
HEICO Corporation operates in the Industrials sector, specifically Aircraft Engines & Engine Parts. Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
| Date | Session | Price | Move | Z-Score | Rel. Vol. |
|---|---|---|---|---|---|
| Aug 28, 2026 | Pre-market | $337.01 | -3.35% | -2.61 | — |
| Aug 27, 2026 | Regular | $334.56 | -3.35% | -2.61 | 1.1× |
| Aug 27, 2026 | After-hours | $334.56 | -3.35% | -2.61 | 1.2× |
About HEI Market Moves
This page tracks unusual market activity for HEICO Corporation (HEI) across all trading sessions — pre-market (4:00 AM–9:30 AM ET), regular hours (9:30 AM–4:00 PM ET), and after-hours (4:00 PM–8:00 PM ET). A move is flagged as "unusual" when its Z-score reaches 2 or higher, meaning the price change is statistically significant relative to HEI's recent daily volatility.
Z-score is calculated by comparing each move to the 20-day average return and standard deviation. A Z-score of 2.0 means the move is 2 standard deviations beyond the average — occurring in roughly the top 5% of daily moves. Relative volume (RVOL) compares current volume to the 20-day average volume at the same time of day, helping distinguish genuine institutional activity from noise.