1 calls and 0 puts traded on Nov 4, 2026, 1 contracts in total. Open interest was 9.35K contracts. Over the past 30 days, volume averaged 205 contracts per day. The PRTA option volume chart shows volume by strike and expiration date.

Prothena IV rank is 72, so its 30-day implied volatility of 214.6% is in the upper part of its one-year range. Over the past year it ranged from 42.7% on Dec 17, 2025 to 282.4% on Sep 16, 2026. See the PRTA implied volatility history for a longer view.

The Prothena put/call volume ratio was 0.00 on Nov 4, 2026, so calls outnumber puts. The put/call open interest ratio was 0.32. The PRTA open interest chart shows calls and puts at each strike.

As of the Nov 4, 2026 close, max pain for Prothena options about one week from expiration was $6.89, 17.8% below the $8.39 close. The PRTA max pain chart shows it for every expiration date.

Based on 7-day implied volatility of 289.5%, options price a move of about ±$3.36 (±40.1%) over the next week, a range of roughly $5.03 to $11.75 from the Nov 4, 2026 close. The PRTA expected move chart shows it for every expiration date.