UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported):  November 21, 2011

Main Street Capital Corporation

 (Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code:  (713) 350-6000

Not Applicable

 Former name or former address, if changed since last report

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o            Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o            Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o            Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o            Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 1.01                                           Entry into a Material Definitive Agreement.

Item 2.03                                           Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

On November 21, 2011, Main Street Capital Corporation (“Main Street”) entered into that certain Third Amendment to Amended and Restated Credit Agreement and First Amendment to Amended and Restated Custodial Agreement (the “Amendment”) among Main Street, as borrower, Main Street Capital Partners, LLC and Main Street Equity Interests, Inc., as guarantors, Branch Banking and Trust Company (“BB&T”), Capital One, N.A., Regions Bank, The Frost National Bank, Texas Capital Bank, Compass Bank and Cadence Bank, N.A., collectively as lenders, and BB&T as administrative agent to (i) increase the total commitments under the Credit Agreement from $155 million to $210 million, (ii) increase the accordion feature of the Credit Agreement to allow Main Street to seek up to $300 million of total commitments from new or existing lenders on the same terms and conditions as the existing commitments, and (iii) include two one-year extension options that could potentially extend maturity of the Credit Agreement from September 20, 2014 to September 20, 2016, subject to certain conditions.

BB&T and the other lenders under the Credit Agreement, and their respective affiliates, may from time to time receive customary fees and expenses in the performance of investment banking, financial advisory or other services for Main Street.

The above summary is not complete and is qualified in its entirety to the full text of the Credit Agreement as amended by the Amendment and related documents.

Item 8.01                                           Other Events.

On November 22, 2011, the Registrant issued a press release. A copy of such press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

The information disclosed under Item 8.01, including Exhibit 99.1 hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 and shall not be deemed incorporated by reference into any filing made under the Securities Act of 1933, except as expressly set forth by specific reference in such filing.

Item 9.01                                           Financial Statements and Exhibits.

(d) Exhibits

10.1                                     Third Amendment to Amended and Restated Credit Agreement and First Amendment to Amended and Restated Custodial Agreement dated November 21, 2011

99.1                                     Press release dated November 22, 2011

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

2

Exhibit Index

3