Spero Therapeutics (SPRO)'s 30-day implied volatility (IV30) was 60.6% at the close on October 22, 2026, down from 67.3% the day before, against a 52-week range of 35.5% to 154.7%. Its 20-day historical volatility was 67.6%.

Key numbers

30-day implied volatility (IV30): 60.6%
IV30 52-week range: 35.5% to 154.7% (median 64.5%)
Historical volatility: 20-day 67.6%, 1-year 61.9%
Implied move by the nearest expiration: ±4.2%

Data as of October 22, 2026.

SPRO Implied Volatility (IV) vs Historical Volatility (HV)

Name: SPRO Implied Volatility
Creator: Market Chameleon