22 calls and 27 puts traded on Nov 4, 2026, 49 contracts in total. Open interest was 13.76K contracts. Over the past 30 days, volume averaged 519 contracts per day. The RGEN option volume chart shows volume by strike and expiration date.

Repligen IV rank is 9, so its 30-day implied volatility of 52.6% is near the bottom of its one-year range. Over the past year it ranged from 37.8% on Dec 22, 2025 to 195.3% on Oct 16, 2026. See the RGEN implied volatility history for a longer view.

The Repligen put/call volume ratio was 1.23 on Nov 4, 2026, so puts outnumber calls. The put/call open interest ratio was 2.40. The RGEN open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for Repligen options about one week from expiration was $170.92, 4.1% below the $178.30 close. The RGEN max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 55.3%, options price a move of about ±$13.65 (±7.7%) over the next week, a range of roughly $164.65 to $191.95 from the Nov 4, 2026 close. The RGEN expected move chart shows it for every expiration date.