Filed Pursuant to Rule 433

Issuer Free Writing Prospectus dated January 10, 2024

Relating to Preliminary Prospectus Supplement dated January 10, 2024 and

Prospectus dated March 3, 2022

Registration No. 333-263258

MAIN STREET CAPITAL CORPORATION

$350,000,000

6.950% Notes due 2029

PRICING TERM SHEET

January 10, 2024

The following sets forth the final terms of the 6.950% Notes due 2029 and should only be read together with the preliminary prospectus supplement dated January 10, 2024, together with the accompanying prospectus dated March 3, 2022, relating to these securities (collectively, the “Preliminary Prospectus”), and supersedes the information in the Preliminary Prospectus to the extent inconsistent with the information in the Preliminary Prospectus. In all other respects, this pricing term sheet is qualified in its entirety by reference to the Preliminary Prospectus. Terms used herein but not defined herein shall have the respective meanings as set forth in the Preliminary Prospectus. All references to dollar amounts are references to U.S. dollars.

Issuer:			Main Street Capital Corporation
Security:			6.950% Notes due 2029
Expected Ratings*:			BBB- Stable (Fitch)
			BBB- Stable (S&P)
Aggregate Principal Amount Offered:			$350,000,000
Maturity:			March 1, 2029
Trade Date:			January 10, 2024
Settlement Date:			January 12, 2024 (T+2)
Use of Proceeds:			Repay outstanding indebtedness, including amounts outstanding under the Company’s multi-year revolving credit facility, the Company’s special purpose vehicle revolving credit facility or the Company’s 5.20% senior notes due 2024
Price to Public (Issue Price):			99.865%
Coupon (Interest Rate):			6.950%
Yield to Maturity:			6.977%
Spread to Benchmark Treasury:			+ 300 basis points
Benchmark Treasury:			3.750% due 12/31/2028
Benchmark Treasury Price and Yield:			98-31+ and 3.977%
Interest Payment Dates:			March 1 and September 1 of each year, commencing September 1, 2024

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Optional Redemption:			Prior to February 1, 2029 (one month prior to the maturity date of the Notes) (the “Par Call Date”), the Company may redeem the Notes at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (1)(a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 45 basis points less (b) interest accrued to the date of redemption, and (2)100% of the principal amount of the Notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to the redemption date. On or after the Par Call Date, the Company may redeem the Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the redemption date.
Offer to Purchase upon a Change of Control Repurchase Event:			If a Change of Control Repurchase Event (as defined in “Description of the Notes” in the Preliminary Prospectus) occurs prior to maturity, holders will have the right, at their option, to require the Company to repurchase for cash some or all of the Notes at a repurchase price equal to 100% of the principal amount of the Notes being repurchased, plus accrued and unpaid interest to, but not including, the repurchase date.
Denomination:			$2,000 and integral multiples of $1,000 in excess thereof
CUSIP:			56035L AH7
ISIN:			US56035LAH78
Underwriting Discount:			0.750%
Active Bookrunners:			SMBC Nikko Securities America, Inc.
			J.P. Morgan Securities LLC
			RBC Capital Markets, LLC
			Truist Securities, Inc.
Co-Managers:			Raymond James & Associates, Inc.
			TCBI Securities, Inc.
			Hancock Whitney Investment Services, Inc.
			Oppenheimer & Co. Inc.
			Zions Direct, Inc.
			Regions Securities LLC
			Comerica Securities, Inc.
			B. Riley Securities, Inc.

* Note: A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time.

Investors are advised to carefully consider the investment objectives, risks, charges and expenses of Main Street Capital Corporation before investing. The Preliminary Prospectus, which has been filed with the Securities and Exchange Commission, contains this and other information about Main Street Capital Corporation and should be read carefully before investing.

The information in the Preliminary Prospectus and in this announcement is not complete and may be changed. The Preliminary Prospectus and this pricing term sheet are not offers to sell any securities of Main Street Capital Corporation and are not soliciting an offer to buy such securities in any state where such offer and sale is not permitted.

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The issuer has filed a registration statement, including a prospectus and a preliminary prospectus supplement with the Securities and Exchange Commission, for the offering to which this communication relates. Before you invest, you should read the Preliminary Prospectus and other documents the issuer has filed with the Securities and Exchange Commission for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the Securities and Exchange Commission web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the Preliminary Prospectus if you request them by contacting SMBC Nikko Securities America, Inc., 277 Park Avenue, 5th Floor, New York, NY 10172 Attn: Debt Capital Markets, tel: 1-888-868-6856, email: prospectus@smbcnikko-si.com.