705 calls and 318 puts traded on Nov 4, 2026, 1.02K contracts in total. Open interest was 78.06K contracts. Over the past 30 days, volume averaged 2.96K contracts per day. The ERO option volume chart shows volume by strike and expiration date.

Ero Copper IV rank is 11, so its 30-day implied volatility of 60.7% is near the bottom of its one-year range. Over the past year it ranged from 46.0% on Nov 28, 2025 to 176.0% on May 15, 2026. See the ERO implied volatility history for a longer view.

The Ero Copper put/call volume ratio was 0.45 on Nov 4, 2026, so calls outnumber puts. The put/call open interest ratio was 0.28. The ERO open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for Ero Copper options about one week from expiration was $30.14, 2.2% below the $30.83 close. The ERO max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 63.1%, options price a move of about ±$2.69 (±8.7%) over the next week, a range of roughly $28.14 to $33.52 from the Nov 4, 2026 close. The ERO expected move chart shows it for every expiration date.