Bel Fuse - Class B (BELFB)'s 30-day implied volatility (IV30) was 51.7% at the close on November 10, 2026, up from 51.6% the day before, against a 52-week range of 37.4% to 70.7%. Its 20-day historical volatility was 78.7%.

Key numbers

30-day implied volatility (IV30): 51.7%
IV30 52-week range: 37.4% to 70.7% (median 51.0%)
Historical volatility: 20-day 78.7%, 1-year 60.7%
Implied move by the nearest expiration: ±3.3%

Data as of November 10, 2026.

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

Name: BELFB Implied Volatility
Creator: Market Chameleon