Unusual price movements and significant market activity for West Pharmaceutical Services, Inc. (WST). Each move is flagged by Z-score statistical significance — showing when WST moved beyond its typical daily range. 3 significant moves detected in the last 30 days.
Current Market State
What May Be Driving WST?
No specific catalyst has been identified in the available market data for West Pharmaceutical Services, Inc. (WST). The moves shown below are flagged based on statistical significance (Z-score ≥ 2), meaning WST 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.
West Pharmaceutical Services, Inc. operates in the Healthcare sector, specifically Surgical & Medical Instruments & Apparatus. 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 | Regular | $338.05 | -2.32% | -2.61 | 0.4× |
| Aug 28, 2026 | After-hours | $337.99 | -2.34% | -2.63 | 0.5× |
| Aug 3, 2026 | Pre-market | $340.96 | +6.07% | 4.05 | — |
About WST Market Moves
This page tracks unusual market activity for West Pharmaceutical Services, Inc. (WST) 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 WST'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.