An option chain lists every call and put for a stock, with prices, volume, open interest, and Greeks for each strike and expiration date.

As of Nov 4, 2026, Prothena Corporation plc (PRTA) had 182 listed option contracts across 6 expiration dates, from Nov 20, 2026 to Jan 21, 2028.

Prothena had 6 expiration dates as of Nov 4, 2026, 1 of them weekly. The nearest was Nov 20, 2026 and the furthest Jan 21, 2028.

1 Prothena option contracts traded on Nov 4, 2026, and 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.

Prothena Corp PLC is a late-stage clinical biotechnology company that focuses on protein dysregulation and a pipeline of investigational therapeutics with the potential to change the course of devastating neurodegenerative and rare and peripheral amyloid diseases.