GBDC · GOLUB CAPITAL BDC, Inc.

Track GBDC — free

$13.26 -0.14 (-1.04%) At close · Aug 14

Market Cap

$3.44B

259.65M

Options Chain

Underlying $13.26 · at close Aug 14, 2026 Options Calculator

Positioning

Aug 21, 2026 · 6 days to expiry · 20 contracts · mixed snapshot sessions · Feb 23, 2026–Aug 14, 2026; 7 unknown

Put / call OI

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dated and unknown snapshot sessions

Open interest

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dated and unknown snapshot sessions

Volume

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dated and unknown snapshot sessions

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 6d Sep 18 34d Nov 20 97d Feb 19 188d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	4	690.9%	0.991	$10.72		$0.05	—	—	1	1
Call · $2.5 In the money Snapshot session Jun 12, 2026 Last $10.72 Breakeven $13.22 Implied vol 690.9% Delta 0.991 ≈99% ITM Gamma 0.002 Theta -0.021 Vega 0 Open interest 0 Model this call Put · $2.5 Snapshot session Mar 31, 2026 Last $0.05 Breakeven $2.45 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
0	1	418%	0.984	$8.35		—	—	—	—	0
Call · $5 In the money Snapshot session Jun 12, 2026 Last $8.35 Breakeven $13.35 Implied vol 418% Delta 0.984 ≈98% ITM Gamma 0.006 Theta -0.021 Vega 0.001 Open interest 0 Model this call Put · $5 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	2	—	—	$5.91		$0.13	—	—	1	212
Call · $7.5 In the money Snapshot session Jun 10, 2026 Last $5.91 Breakeven $13.41 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $7.5 Snapshot session May 27, 2026 Last $0.13 Breakeven $7.37 Implied vol — Delta — Gamma — Theta — Vega — Open interest 212 Model this put
1	1	143.8%	0.956	$2.80		$0.05	-0.07	167.5%	1	1.3k
Call · $10 In the money Snapshot session Jul 31, 2026 Last $2.80 Breakeven $12.80 Implied vol 143.8% Delta 0.956 ≈96% ITM Gamma 0.04 Theta -0.017 Vega 0.001 Open interest 1 Model this call Put · $10 Snapshot session Aug 4, 2026 Last $0.05 Breakeven $9.95 Implied vol 167.5% Delta -0.07 ≈7% ITM Gamma 0.047 Theta -0.033 Vega 0.003 Open interest 1.3k Model this put
965	1	—	—	$0.80		$0.04	-0.222	75.9%	4	1.8k
Call · $12.5 In the money Snapshot session Aug 14, 2026 Last $0.80 Breakeven $13.30 Implied vol — Delta — Gamma — Theta — Vega — Open interest 965 Model this call Put · $12.5 Snapshot session Aug 14, 2026 Last $0.04 Breakeven $12.46 Implied vol 75.9% Delta -0.222 ≈22% ITM Gamma 0.232 Theta -0.034 Vega 0.006 Open interest 1.8k Model this put
Underlying $13.26
509	30	86.1%	0.165	$0.05		$2.10	-0.664	164.9%	8	0
Call · $15 Snapshot session Aug 7, 2026 Last $0.05 Breakeven $15.05 Implied vol 86.1% Delta 0.165 ≈16% ITM Gamma 0.169 Theta -0.03 Vega 0.005 Open interest 509 Model this call Put · $15 In the money Snapshot session May 14, 2026 Last $2.10 Breakeven $12.90 Implied vol 164.9% Delta -0.664 ≈66% ITM Gamma 0.129 Theta -0.089 Vega 0.006 Open interest 0 Model this put
20	10	—	—	$0.05		—	-0.763	237.9%	—	0
Call · $17.5 Snapshot session May 5, 2026 Last $0.05 Breakeven $17.55 Implied vol — Delta — Gamma — Theta — Vega — Open interest 20 Model this call Put · $17.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 237.9% Delta -0.763 ≈76% ITM Gamma 0.075 Theta -0.107 Vega 0.005 Open interest 0 Model this put
2	1	—	—	$0.05		—	-0.798	303.3%	—	0
Call · $20 Snapshot session Feb 23, 2026 Last $0.05 Breakeven $20.05 Implied vol — Delta — Gamma — Theta — Vega — Open interest 2 Model this call Put · $20 In the money Snapshot session Unknown Last — Breakeven — Implied vol 303.3% Delta -0.798 ≈80% ITM Gamma 0.054 Theta -0.124 Vega 0.005 Open interest 0 Model this put
0	—	—	—	—		—	-0.818	358.2%	—	0
Call · $22.5 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $22.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 358.2% Delta -0.818 ≈82% ITM Gamma 0.043 Theta -0.139 Vega 0.004 Open interest 0 Model this put
0	—	—	—	—		—	-0.831	399%	—	0
Call · $25 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $25 In the money Snapshot session Unknown Last — Breakeven — Implied vol 399% Delta -0.831 ≈83% ITM Gamma 0.036 Theta -0.145 Vega 0.004 Open interest 0 Model this put

About this data

Each contract's last price, volume, greeks, implied volatility and open interest belongs to the snapshot session shown in its details; unknown means the provider omitted the timestamp. This chain has mixed snapshot sessions · Feb 23, 2026–Aug 14, 2026; 7 unknown. Cross-contract positioning totals are shown only when every returned row has the same known session. Bid and ask are not included on this plan.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown.

Key facts CIK 1476765 CUSIP 38173M102 13F (30d) 292 filings 290 filers Visit website Investor relations