125 calls and 48 puts traded on Nov 4, 2026, 173 contracts in total. Open interest was 4.84K contracts. Over the past 30 days, volume averaged 106 contracts per day. The WSO option volume chart shows volume by strike and expiration date.

Watsco IV rank is 10, so its 30-day implied volatility of 41.2% is near the bottom of its one-year range. Over the past year it ranged from 26.3% on Dec 26, 2025 to 178.8% on Jul 17, 2026. See the WSO implied volatility history for a longer view.

The Watsco put/call volume ratio was 0.38 on Nov 4, 2026, so calls outnumber puts. The put/call open interest ratio was 0.18. The WSO open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for Watsco options about one week from expiration was $300.00, 6.1% below the $319.35 close. The WSO max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 45.2%, options price a move of about ±$20.00 (±6.3%) over the next week, a range of roughly $299.35 to $339.35 from the Nov 4, 2026 close. The WSO expected move chart shows it for every expiration date.