GOLUB CAPITAL BDC, Inc. (GBDC) Implied Volatility
GOLUB CAPITAL BDC, Inc. (GBDC) options trade at a 30-day at-the-money implied volatility of 40.0%, an IV rank of 13 out of 100 over the past year. This page breaks down GBDC's implied volatility in plain English: where it sits versus its own history, how it compares with realized movement, and what the term structure and skew are saying.
Data as of Jul 10, 2026, 8:00 PM ET · OPRA data 15 minutes delayed · For information only — not investment advice.
Implied Volatility & Expected Move
GBDC 30-day at-the-money implied volatility, past year.
| ATM IV — front expiration | 40.0% |
| ATM IV — 2 month | 32.8% |
| IV rank (1 year) | 13 / 100 |
| IV percentile (1 year) | 49% |
| Expected move (front expiration) | ±$0.70 (±5.5%) |
| Historical volatility — 10 day | 15.0% |
| Historical volatility — 21 day | 18.4% |
| Historical volatility — 30 day | 16.7% |
| Historical volatility — 60 day | 23.9% |
| IV / HV ratio | 2.40 |
| Term slope (front − 3M) | +7.2 pts |
An IV rank of 13 places current implied volatility in the lower part of its 52-week range. With an IV/HV ratio of 2.40, options currently price in more movement than the stock has recently realized. The term structure is in backwardation — front-month IV exceeds 3-month IV, a pattern often seen around near-term events.
GBDC IV Rank History
GBDC IV rank (0–100), past year.
IV rank has fallen from 39 in Feb '26 to 13 today. An IV percentile of 49% means implied volatility was lower than today on 49% of trading days in the past year.
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GBDC Options FAQ
What is the implied volatility of GBDC options?
GBDC options trade at a 30-day at-the-money implied volatility of 40.0% as of Jul 10, 2026. That is an IV rank of 13 out of 100, meaning implied volatility is subdued relative to its own 52-week range.
Is GBDC implied volatility high or low right now?
By its own 52-week standards, GBDC implied volatility is currently low: IV rank is 13 out of 100 as of Jul 10, 2026. Compared with realized movement, the IV/HV ratio of 2.40 shows options pricing more movement than the stock has recently delivered.
What move do GBDC options imply before the next expiration?
Front-expiration GBDC options imply a one-standard-deviation move of ±$0.70 (±5.5%) as of Jul 10, 2026, derived from at-the-money option prices.
What is the difference between GBDC's IV rank and IV percentile?
IV rank (currently 13) measures where today's implied volatility sits between its 52-week low and high. IV percentile (currently 49%) counts the share of trading days in the past year with lower implied volatility than today. Percentile is less distorted by one-off volatility spikes.
Methodology. IV rank compares the current 30-day at-the-money implied volatility with its highest and lowest values over the past 52 weeks. Max pain is the strike that minimizes the total payout to option holders at expiration. The call and put walls are the strikes carrying the largest call and put open interest across all expirations. Net gamma exposure (GEX) is measured from the dealer perspective. All statistics are derived from delayed OPRA options data.
Options trading involves significant risk, and losses can exceed your initial investment. Always consult a licensed financial professional before making investment decisions. OptiView does not provide financial advice; all figures on this page are descriptive statistics, not recommendations.