449 calls and 347 puts traded on Nov 4, 2026, 796 contracts in total. Open interest was 6.4K contracts. Over the past 30 days, volume averaged 314 contracts per day. The WST option volume chart shows volume by strike and expiration date.

West Pharmaceutical Services IV rank is 3, so its 30-day implied volatility of 25.8% is near the bottom of its one-year range. Over the past year it ranged from 22.8% on Sep 18, 2026 to 139.6% on May 15, 2026. See the WST implied volatility history for a longer view.

The West Pharmaceutical Services put/call volume ratio was 0.77 on Nov 4, 2026, so calls outnumber puts. The put/call open interest ratio was 0.75. The WST open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for West Pharmaceutical Services options about one week from expiration was $380.46, 6.9% below the $408.72 close. The WST max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 26.2%, options price a move of about ±$14.81 (±3.6%) over the next week, a range of roughly $393.91 to $423.53 from the Nov 4, 2026 close. The WST expected move chart shows it for every expiration date.