WST· West Pharmaceutical Services
For the 20 Nov 2026 expiry, WST's max pain is 380 against a spot of 392.48, 3.2% below it. Put open interest is 0.33 times call open interest across the shown strikes (285 puts, 863 calls). The largest call position is at 380 and the largest put position at 340. Max pain is a heuristic for where option holders lose most at expiry, not a price target.
Open interest by strike (contracts)
Open interest by strike with the max-pain level marked, per expiry — heuristics over CBOE delayed chains, same strike band as the GEX profile.
WST open interest, night by night.
Total call and put contracts held on each recorded session — the level the strike profile above is a snapshot of.
Contracts outstanding, summed over the whole captured chain — every listed expiry and strike, wider than the strike band and single expiry shown in the profile above.
One reading per session, captured nightly after the close, 10 Jun → 5 Nov, over CBOE delayed (~15-min) chains, computed across the full listed chain. Gaps are weekends, holidays and sessions a capture missed; any reading can be absent on a session that was captured, and the series is broken rather than drawn through it.