194 calls and 91 puts traded on Nov 4, 2026, 285 contracts in total. Open interest was 4.69K contracts. Over the past 30 days, volume averaged 157 contracts per day. The WLK option volume chart shows volume by strike and expiration date.

Westlake IV rank is 5, so its 30-day implied volatility of 39.5% is near the bottom of its one-year range. Over the past year it ranged from 32.3% on Oct 1, 2026 to 189.5% on Jul 17, 2026. See the WLK implied volatility history for a longer view.

The Westlake put/call volume ratio was 0.47 on Nov 4, 2026, so calls outnumber puts. The put/call open interest ratio was 0.36. The WLK open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for Westlake options about one week from expiration was $65.57, 3.4% below the $67.90 close. The WLK max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 37.1%, options price a move of about ±$3.49 (±5.1%) over the next week, a range of roughly $64.41 to $71.39 from the Nov 4, 2026 close. The WLK expected move chart shows it for every expiration date.