Pre-market price movements and significant market activity for STERIS plc ($STE). Each move is flagged by Z-score statistical significance — showing when $STE moved beyond its typical daily range. 3 significant moves detected in the last 30 days.
Current Market State
What May Be Driving STE?
STERIS announced a definitive agreement to acquire Xodus Medical for $2.1 billion.
STERIS plc operates in the Healthcare sector, specifically Orthopedic, Prosthetic & Surgical Appliances & Supplies. Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
| Date | Session | Price | Move | Z-Score | Rel. Vol. |
|---|---|---|---|---|---|
| Oct 12, 2026 | Regular | $218.56 | +1.94% | 2.11 | 0.7× |
| Oct 12, 2026 | After-hours | $218.98 | +2.14% | 2.33 | 1.0× |
| Oct 9, 2026 | Regular | $215.62 | +2.31% | 2.63 | 0.5× |
About STE Premarket Movers
This page tracks unusual market activity for STERIS plc (STE) 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 STE'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.