Main Street Capital (MAIN) Options Chain

NYSE: MAINFinanceFinance/Investors ServicesUSD

53.87-0.60 (-1.10%)

Market open · Delayed 15 min · as of Oct 9, 2:29 PM ET

Expiration date

Expiration: Oct 16, 2026
Days to expiration: 7
Share price: $53.87
Put/call ratio (OI): 17.36
Put/call ratio (volume): 0.52
ATM implied volatility: 34.9%
Expected move: ±$2.60
Open interest (C / P): 1.12K / 19.46K

MAIN options summary

The MAIN options chain for the October 16, 2026 expiration lists 9 call and 11 put contracts, with 7 days until expiration. Open interest stands at 1,121 calls and 19,457 puts, a put/call ratio of 17.36, which is more bearish, with puts outnumbering calls. At-the-money implied volatility near the $54.70 strike is 34.9%, which implies the market expects a move of about ±$2.60 (4.8%) in Main Street Capital stock by expiration.

The most open interest sits at the $59.70 call (469 contracts) and the $55.00 put (5.10K contracts).

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

MAIN options chain · October 16, 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	44	270.9%	24.25	23.20	26.10	29.70	—	—	—	—	—	—
0	33	441.8%	28.10	24.80	28.10	30.00	—	—	—	—	—	—
—	—	—	—	—	—	44.70	0.00	0.05	0.03	59.0%	18	8
—	—	—	—	—	—	45.00	0.00	0.35	0.05	81.3%	1	2
0	2	61.2%	4.70	4.00	5.30	49.70	0.00	0.05	0.05	32.8%	1	35
—	—	—	—	—	—	50.00	0.05	0.25	0.01	46.3%	1	11
MAIN $53.87
111	22	21.4%	0.35	0.20	0.35	54.70	1.00	2.00	0.88	48.3%	2	5,077
102	5	75.4%	1.91	1.60	2.20	55.00	0.70	1.00	0.81	—	52	5,102
469	6	39.1%	0.03	0.00	0.05	59.70	5.30	6.00	5.65	51.0%	6	4,601
316	59	51.2%	0.15	0.10	0.15	60.00	2.90	4.60	4.01	—	1	4,612
58	7	56.3%	0.03	0.00	0.05	64.70	9.60	11.10	9.93	87.4%	7	0
65	1	57.8%	0.06	0.00	0.05	65.00	7.60	9.50	8.52	—	3	7
—	—	—	—	—	—	84.70	28.90	31.80	29.67	229.7%	1	2

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 October 16, 2026 expiration, the MAIN put/call ratio based on open interest is 17.36 (19,457 puts vs 1,121 calls), and 0.52 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 October 16, 2026 is about 34.9%, 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.