WST· West Pharmaceutical Services
Open interest · contracts by strike
Spot
346.2
Max Pain
340
Call OI
565
Put OI
343
P/C ratio
0.61
Open interest by strike (contracts)
Call OIPut OISpot / max pain
Max pain 340
Spot 346.2
390
41
380
22
370
63
360
78
350
25
296
Call OI
340
64
23
Max pain
330
105
320
310
25
300
113
17
Put OI
Open interest by strike with the max-pain level marked, per expiry — heuristics over CBOE delayed chains, same strike band as the GEX profile.
History
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.
10 Jun → 11 Sep
OI totals over time
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.
call OI, contractsput OI, contracts
One reading per session, captured nightly after the close, 10 Jun → 11 Sep, 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.