1.68K calls and 951 puts traded on Nov 4, 2026, 2.63K contracts in total. Open interest was 59.41K contracts. Over the past 30 days, volume averaged 2.93K contracts per day. The BIIB option volume chart shows volume by strike and expiration date.

Biogen IV rank is 73, so its 30-day implied volatility of 43.1% is in the upper part of its one-year range. Over the past year it ranged from 27.5% on Dec 5, 2025 to 49.0% on Nov 20, 2025. See the BIIB implied volatility history for a longer view.

The Biogen put/call volume ratio was 0.57 on Nov 4, 2026, so calls outnumber puts. The put/call open interest ratio was 1.00. The BIIB open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for Biogen options about one week from expiration was $242.86, 4.6% below the $254.63 close. The BIIB max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 40.0%, options price a move of about ±$14.11 (±5.5%) over the next week, a range of roughly $240.52 to $268.74 from the Nov 4, 2026 close. The BIIB expected move chart shows it for every expiration date.