Merck Common (New) (MRK)'s 30-day implied volatility (IV30) was 36.2% at the close on October 21, 2026, down from 36.6% the day before, against a 52-week range of 21.2% to 38.7%. Its 20-day historical volatility was 31.0%.

Key numbers

30-day implied volatility (IV30): 36.2%
IV30 52-week range: 21.2% to 38.7% (median 28.3%)
Historical volatility: 20-day 31.0%, 1-year 28.4%
Implied move by the nearest expiration: ±1.9%

Data as of October 21, 2026.

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

Name: MRK Implied Volatility
Creator: Market Chameleon