MAIN · Main Street Capital CORP

Track MAIN — free

$58.80 -0.43 (-0.73%) At close · Aug 14

Market Cap

$5.50B

93.51M

Options Chain

Underlying $58.80 · at close Aug 14, 2026 Options Calculator

Positioning

Aug 21, 2026 · 5 days to expiry · 20 contracts · mixed snapshot sessions · Jul 15, 2026–Aug 14, 2026; 4 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 5d Sep 18 33d Dec 18 124d Mar 19 215d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	1	—	—	$28.20		$0.05	—	—	1	1
Call · $29.7 In the money Snapshot session Aug 7, 2026 Last $28.20 Breakeven $57.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $29.7 Snapshot session Jul 15, 2026 Last $0.05 Breakeven $29.65 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
0	2	220.5%	0.981	$20.75		—	—	—	—	0
Call · $34.7 In the money Snapshot session Aug 3, 2026 Last $20.75 Breakeven $55.45 Implied vol 220.5% Delta 0.981 ≈98% ITM Gamma 0.003 Theta -0.058 Vega 0.003 Open interest 0 Model this call Put · $34.7 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	2	204.4%	0.952	$15.10		—	-0.03	177.4%	—	1
Call · $39.7 In the money Snapshot session Jul 28, 2026 Last $15.10 Breakeven $54.80 Implied vol 204.4% Delta 0.952 ≈95% ITM Gamma 0.007 Theta -0.121 Vega 0.006 Open interest 0 Model this call Put · $39.7 Snapshot session Unknown Last — Breakeven — Implied vol 177.4% Delta -0.03 ≈3% ITM Gamma 0.005 Theta -0.078 Vega 0.006 Open interest 1 Model this put
0	12	153.1%	0.938	$10.50		$0.04	-0.048	138.2%	1	288
Call · $44.7 In the money Snapshot session Aug 3, 2026 Last $10.50 Breakeven $55.20 Implied vol 153.1% Delta 0.938 ≈94% ITM Gamma 0.011 Theta -0.112 Vega 0.011 Open interest 0 Model this call Put · $44.7 Snapshot session Aug 10, 2026 Last $0.04 Breakeven $44.66 Implied vol 138.2% Delta -0.048 ≈5% ITM Gamma 0.01 Theta -0.088 Vega 0.007 Open interest 288 Model this put
2	2	—	—	$9.15		$0.03	-0.068	94.4%	6	5.6k
Call · $49.7 In the money Snapshot session Aug 14, 2026 Last $9.15 Breakeven $58.85 Implied vol — Delta — Gamma — Theta — Vega — Open interest 2 Model this call Put · $49.7 Snapshot session Aug 14, 2026 Last $0.03 Breakeven $49.67 Implied vol 94.4% Delta -0.068 ≈7% ITM Gamma 0.019 Theta -0.08 Vega 0.012 Open interest 5.6k Model this put
947	12	71.2%	0.809	$4.51		$0.10	-0.059	38.3%	12	609
Call · $54.7 In the money Snapshot session Aug 14, 2026 Last $4.51 Breakeven $59.21 Implied vol 71.2% Delta 0.809 ≈81% ITM Gamma 0.052 Theta -0.117 Vega 0.019 Open interest 947 Model this call Put · $54.7 Snapshot session Aug 14, 2026 Last $0.10 Breakeven $54.60 Implied vol 38.3% Delta -0.059 ≈6% ITM Gamma 0.041 Theta -0.029 Vega 0.008 Open interest 609 Model this put
Underlying $58.80
1.6k	6	17%	0.284	$0.27		$1.17	-0.667	22.5%	14	4.9k
Call · $59.7 Snapshot session Aug 14, 2026 Last $0.27 Breakeven $59.97 Implied vol 17% Delta 0.284 ≈28% ITM Gamma 0.268 Theta -0.034 Vega 0.026 Open interest 1.6k Model this call Put · $59.7 In the money Snapshot session Aug 14, 2026 Last $1.17 Breakeven $58.53 Implied vol 22.5% Delta -0.667 ≈67% ITM Gamma 0.218 Theta -0.059 Vega 0.026 Open interest 4.9k Model this put
16	2	44.6%	0.053	$0.04		$10.48	—	—	7	0
Call · $64.7 Snapshot session Aug 11, 2026 Last $0.04 Breakeven $64.74 Implied vol 44.6% Delta 0.053 ≈5% ITM Gamma 0.032 Theta -0.03 Vega 0.008 Open interest 16 Model this call Put · $64.7 In the money Snapshot session Jul 28, 2026 Last $10.48 Breakeven $54.22 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
5	1	—	—	$0.02		—	-0.942	80.8%	—	0
Call · $69.7 Snapshot session Aug 11, 2026 Last $0.02 Breakeven $69.72 Implied vol — Delta — Gamma — Theta — Vega — Open interest 5 Model this call Put · $69.7 In the money Snapshot session Unknown Last — Breakeven — Implied vol 80.8% Delta -0.942 ≈94% ITM Gamma 0.019 Theta -0.067 Vega 0.008 Open interest 0 Model this put
1	1	—	—	$0.10		—	—	—	—	0
Call · $74.7 Snapshot session Jul 20, 2026 Last $0.10 Breakeven $74.80 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this call Put · $74.7 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — 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 · Jul 15, 2026–Aug 14, 2026; 4 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 1396440 CUSIP 56035L104 13F (30d) 359 filings 355 filers Visit website Investor relations