West Pharmaceutical Services (WST) Options Chain
NYSE: WSTHealth CareMedical/Dental InstrumentsUSD
At close: Oct 8, 4:00 PM ET · Delayed 15 min
After hours: 363.27 0.00%
Expiration date
- Expiration
- Oct 16, 2026
- Days to expiration
- 8
- Share price
- $363.27
- Put/call ratio (OI)
- 0.18
- Put/call ratio (volume)
- 0.37
- Expected move
- ±$16.56
- Open interest (C / P)
- 820 / 151
WST options summary
The WST options chain for the October 16, 2026 expiration lists 10 call and 9 put contracts, with 8 days until expiration. Open interest stands at 820 calls and 151 puts, a put/call ratio of 0.18, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $360.00 strike is 30.8%, which implies the market expects a move of about ±$16.56 (4.6%) in West Pharmaceutical Services stock by expiration.
The most open interest sits at the $390.00 call (305 contracts) and the $340.00 put (46 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
WST options chain · October 16, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| — | — | — | 290.00 | 0.00 | 3.20 | 0.40 | |||||
| — | — | — | 300.00 | 0.00 | 3.40 | 1.73 | |||||
| — | — | — | 310.00 | 0.00 | 3.40 | 0.63 | |||||
| — | — | — | 320.00 | 0.00 | 2.80 | 1.50 | |||||
| 31.81 | 32.80 | 35.70 | 330.00 | 0.00 | 2.85 | 1.50 | |||||
| 14.10 | 22.50 | 26.30 | 340.00 | 0.00 | 3.60 | 2.45 | |||||
| 25.85 | 13.00 | 17.00 | 350.00 | 0.05 | 2.05 | 0.42 | |||||
| 16.75 | 6.00 | 9.50 | 360.00 | 2.40 | 4.70 | 1.40 | |||||
| 2.89 | 1.85 | 3.50 | 370.00 | 7.40 | 10.00 | 11.00 | |||||
| 0.79 | 0.10 | 1.60 | 380.00 | — | — | — | |||||
| 0.75 | 0.00 | 0.55 | 390.00 | — | — | — | |||||
| 0.87 | 0.00 | 1.90 | 400.00 | — | — | — | |||||
| 1.27 | 0.00 | 3.40 | 410.00 | — | — | — | |||||
| 0.42 | 0.00 | 4.90 | 420.00 | — | — | — | |||||
In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.
Frequently asked questions
What is the WST put/call ratio?
For the October 16, 2026 expiration, the WST put/call ratio based on open interest is 0.18 (151 puts vs 820 calls), and 0.37 based on today's volume. A ratio above 1 means more puts than calls.
What is WST's implied volatility?
At-the-money implied volatility for WST options expiring October 16, 2026 is about 30.8%, an annualized estimate of how much the market expects West Pharmaceutical Services stock to move.
How many WST option expiration dates are there?
WST has 7 listed expiration dates, from Oct 16, 2026 to Dec 17, 2027.
What does "in the money" mean?
A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.