Main Street Capital (MAIN) Options Chain

NYSE: MAINFinanceFinance/Investors ServicesUSD

53.74-0.73 (-1.34%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

Expiration date

Expiration: Dec 18, 2026
Days to expiration: 68
Share price: $53.74
Put/call ratio (OI): 0.72
Put/call ratio (volume): 0.62
ATM implied volatility: 24.9%
Expected move: ±$5.78
Open interest (C / P): 8.06K / 5.78K

MAIN options summary

The MAIN options chain for the December 18, 2026 expiration lists 25 call and 27 put contracts, with 68 days until expiration. Open interest stands at 8,059 calls and 5,779 puts, a put/call ratio of 0.72, which is fairly balanced between calls and puts. At-the-money implied volatility near the $54.40 strike is 24.9%, which implies the market expects a move of about ±$5.78 (10.7%) in Main Street Capital stock by expiration.

The most open interest sits at the $59.40 call (1.24K contracts) and the $54.70 put (805 contracts).

Summary generated from market data by MetaCap's automated system. Methodology

MAIN options chain · December 18, 2026

MAIN calls and puts by strike price. Shaded cells are in the money.
Calls							Puts
OI	Vol	IV	Last	Bid	Ask	Strike	Bid	Ask	Last	IV	Vol	OI
0	1	207.1%	23.00	27.20	31.30	29.70	0.00	1.35	0.10	99.9%	4	142
1	2	—	21.43	19.00	23.20	30.00	0.05	0.45	0.36	78.9%	3	70
—	—	—	—	—	—	34.40	0.00	0.50	0.15	62.8%	4	86
0	—	—	16.40	0.00	0.00	34.70	0.00	0.50	0.20	61.7%	1	86
0	—	—	16.40	14.00	18.20	35.00	0.15	0.65	0.60	67.3%	9	114
0	—	77.0%	18.00	13.00	15.80	39.40	0.10	0.25	0.15	46.5%	3	400
0	5	91.0%	18.00	14.90	17.80	39.70	0.00	0.95	0.15	53.2%	1	408
13	8	—	11.75	10.00	13.40	40.00	1.10	1.35	1.19	69.8%	8	374
0	1	55.9%	10.77	9.30	10.80	44.40	0.15	0.35	0.25	34.4%	19	248
1	5	74.7%	14.90	10.30	13.40	44.70	0.20	0.30	0.28	32.1%	1	246
29	1	—	8.40	6.40	8.10	45.00	2.15	2.30	2.28	65.0%	8	207
16	1	36.8%	5.43	4.50	5.90	49.40	0.60	0.90	0.75	27.9%	2	519
15	2	55.6%	8.00	6.30	8.20	49.70	0.50	0.75	0.75	24.6%	2	473
55	2	20.7%	3.21	3.30	4.30	50.00	3.60	4.30	4.30	62.7%	2	460
MAIN $53.74
817	6	24.7%	1.70	1.25	2.00	54.40	2.20	2.70	2.50	25.1%	7	453
845	13	39.0%	2.80	2.40	3.20	54.70	1.85	2.10	1.92	16.8%	9	805
581	29	26.3%	1.80	1.65	1.90	55.00	6.30	7.50	6.80	66.5%	1	174
1,235	15	19.9%	0.20	0.15	0.30	59.40	5.10	6.60	6.20	30.1%	1	206
1,208	45	30.3%	0.85	0.70	0.90	59.70	4.30	5.40	4.10	—	1	205
382	7	33.9%	0.75	0.45	1.10	60.00	9.90	11.10	9.24	70.6%	1	11
461	6	27.5%	0.05	0.00	0.20	64.40	9.80	11.30	8.93	37.5%	23	29
450	4	32.1%	0.21	0.05	0.35	64.70	8.00	9.70	9.01	—	3	28
95	26	32.7%	0.33	0.20	0.35	65.00	13.80	17.20	15.45	85.6%	3	5
908	12	31.4%	0.03	0.00	0.10	69.40	—	—	—	—	—	—
930	5	34.3%	0.09	0.00	0.15	69.70	12.20	14.60	11.92	—	1	0
17	2	50.6%	0.47	0.00	0.75	70.00	—	—	—	—	—	—
—	—	—	—	—	—	74.70	16.00	18.40	24.51	—	2	1
—	—	—	—	—	—	79.70	20.60	23.30	27.50	—	1	16
—	—	—	—	—	—	84.70	25.50	28.30	32.70	—	2	13

In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.

Frequently asked questions

What is the MAIN put/call ratio?

For the December 18, 2026 expiration, the MAIN put/call ratio based on open interest is 0.72 (5,779 puts vs 8,059 calls), and 0.62 based on today's volume. A ratio above 1 means more puts than calls.

What is MAIN's implied volatility?

At-the-money implied volatility for MAIN options expiring December 18, 2026 is about 24.9%, an annualized estimate of how much the market expects Main Street Capital stock to move.

How many MAIN option expiration dates are there?

MAIN has 6 listed expiration dates, from Oct 16, 2026 to Jan 19, 2029.

What does "in the money" mean?

A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.