Golub Capital Bdc - Closed End (GBDC)'s 30-day implied volatility (IV30) was 21.1% at the close on October 30, 2026, up from 17.5% the day before, against a 52-week range of 11.5% to 34.5%. Its 20-day historical volatility was 20.9%.

Key numbers

30-day implied volatility (IV30): 21.1%
IV30 52-week range: 11.5% to 34.5% (median 19.3%)
Historical volatility: 20-day 20.9%, 1-year 20.4%
Implied move by the nearest expiration: ±0.9%

Data as of October 30, 2026.

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

Name: GBDC Implied Volatility
Creator: Market Chameleon