89 calls and 114 puts traded on Nov 4, 2026, 203 contracts in total. Open interest was 9.61K contracts. Over the past 30 days, volume averaged 367 contracts per day. The ACGL option volume chart shows volume by strike and expiration date.

Arch Capital IV rank is 8, so its 30-day implied volatility of 25.1% is near the bottom of its one-year range. Over the past year it ranged from 12.1% on Nov 25, 2025 to 169.0% on Jul 17, 2026. See the ACGL implied volatility history for a longer view.

The Arch Capital put/call volume ratio was 1.28 on Nov 4, 2026, so puts outnumber calls. The put/call open interest ratio was 0.68. The ACGL open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for Arch Capital options about one week from expiration was $100.22, 9.5% below the $110.69 close. The ACGL max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 28.0%, options price a move of about ±$4.30 (±3.9%) over the next week, a range of roughly $106.39 to $114.99 from the Nov 4, 2026 close. The ACGL expected move chart shows it for every expiration date.