Prothena PLC - (PRTA)'s 30-day implied volatility (IV30) was 54.8% at the close on October 23, 2026, up from 41.8% the day before, against a 52-week range of 33.6% to 67.4%. Its 20-day historical volatility was 58.6%.
Key numbers
30-day implied volatility (IV30): 54.8%
IV30 52-week range: 33.6% to 67.4% (median 50.0%)
Historical volatility: 20-day 58.6%, 1-year 54.1%
Implied move by the nearest expiration: ±2.6%
Data as of October 23, 2026.
PRTA Implied Volatility (IV) vs Historical Volatility (HV)
The PRTA IV term structure shows the implied volatility difference between different maturity dates.
