MAIN / Main Street Capital Corporation - Depositi SEC, Relazione annuale, dichiarazione di delega

Main Street Capital Corporation
US ˙ NYSE ˙ US56035L1044

Statistiche di base
LEI 5493001FS9QJLJNF3E20
CIK 1396440
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Main Street Capital Corporation
SEC Filings (Chronological Order)
Questa pagina fornisce un elenco completo e cronologico dei depositi SEC, esclusi i documenti di proprietà che forniamo altrove.
August 18, 2025 CERT

NYSE TEXAS CERTIFICATION

New York Stock Exchange 11 Wall Street New York, NY 10005 Tel: +1 212.656.3000 nyse.com August 18, 2025 Chief, Information Technology Securities and Exchange Commission Division of Corporate Finance 100 F Street, NE MS 3040 Washington, DC 20549 To whom it may concern: The NYSE Texas certifies its approval for listing and registration of the Shares of common stock, $0.01 par value per share, of Mai

August 18, 2025 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(B) OR (G) OF THE SECURITIES EXCHANGE ACT OF 1934 Main Street Capital Corporation (Exact name of

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(B) OR (G) OF THE SECURITIES EXCHANGE ACT OF 1934 Main Street Capital Corporation (Exact name of Registrant as specified in Charter) Maryland 41-2230745 (State of incorporation or organization) (IRS Employer Identification No.) 1300 Post Oak Boule

August 15, 2025 8-K

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) August 13, 2025 Main Street Capita

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) August 13, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Com

August 15, 2025 EX-4.1

EIGHTH SUPPLEMENTAL INDENTURE MAIN STREET CAPITAL CORPORATION THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee Dated as of August 15, 2025

EIGHTH SUPPLEMENTAL INDENTURE between MAIN STREET CAPITAL CORPORATION and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.

August 15, 2025 EX-1.1

Main Street Capital Corporation (a Maryland Corporation) 5.400% Notes due 2028 Underwriting Agreement

Execution Version Main Street Capital Corporation (a Maryland Corporation) $350,000,000 5.

August 14, 2025 424B2

5.400% Notes due 2028

Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-285405 PROSPECTUS SUPPLEMENT (to Prospectus dated February 28, 2025) $350,000,000 5.400% Notes due 2028 We are offering $350,000,000 in aggregate principal amount of 5.400% notes due 2028, which we refer to as the Notes. The Notes will mature on August 15, 2028. We will pay interest on the Notes on February 15 and August 15 of each y

August 14, 2025 EX-FILING FEES

Calculation of Filing Fee Tables 424(b)(2) (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Fees to Be Paid Debt 5.

August 13, 2025 FWP

MAIN STREET CAPITAL CORPORATION 5.400% Notes due 2028 PRICING TERM SHEET August 13, 2025

Filed Pursuant to Rule 433 Issuer Free Writing Prospectus dated August 13, 2025 Relating to Preliminary Prospectus Supplement dated August 13, 2025 and Prospectus dated February 28, 2025 Registration No.

August 13, 2025 424B2

The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission and become effective under the Securities A

Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-285405 The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission and become effective under the Securities Act of 1933, as amended. This preliminary prospectus supplement and the accompa

August 8, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Number: 8

August 8, 2025 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Second Quarter – 2025 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dat

q22025mainiplp-fwp mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Second Quarter – 2025 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated August 8, 2025 Related to the Registration Statement No. 333-285405 mainstcapital.comNYSE: MAINMain Street Capital Corporation w

August 7, 2025 8-K

UNITED STATES

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) August 7, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Comm

August 7, 2025 EX-99.1

Main Street Capital Corporation

1 Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES SECOND QUARTER 2025 RESULTS Second Quarter 2025 Net Investment Income of $0.

August 5, 2025 EX-99.1

Main Street Capital Corporation

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Fourth Quarter 2025 Regular Monthly Dividends and Supplemental Dividend Payabl

August 5, 2025 8-K

UNITED STATES

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) August 5, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Comm

July 17, 2025 EX-99.1

Main Street Capital Corporation

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of Second Quarter 2025 Operating Results Announces Second

July 17, 2025 8-K

UNITED STATES

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) July 17, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Commi

July 10, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) July 10, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Commi

July 10, 2025 EX-99.1

Main Street Capital Corporation

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Second Quarter 2025 Private Loan Portfolio Activity HOUSTON – July 10, 2025 –

June 5, 2025 8-K

Regulation FD Disclosure

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) June 5, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Commis

May 22, 2025 APP WD

[Letterhead of Eversheds Sutherland (US) LLP] May 21, 2025

[Letterhead of Eversheds Sutherland (US) LLP] May 21, 2025 VIA EDGAR U.S. Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549-4720 Re: Main Street Capital Corporation., et al. File No. 812-15802; Accession No. 0001396440-25-000077 Form APP WD: Request for Withdrawal of Form 40-APP filed on May 16, 2025 To whom it may concern: Main Street Capital Corporation., et al. (the “

May 9, 2025 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation First Quarter – 2025 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus date

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation First Quarter – 2025 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated May 9, 2025 Related to the Registration Statement No. 333-285405 mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Pa

May 9, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Number:

May 8, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) May 8, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Commiss

May 8, 2025 EX-99.1

Main Street Capital Corporation

1 Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES FIRST QUARTER 2025 RESULTS First Quarter 2025 Net Investment Income of $1.01

May 6, 2025 EX-99.1

Main Street Capital Corporation

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Third Quarter 2025 Regular Monthly Dividends, Including a Monthly Dividend Inc

May 6, 2025 8-K

Financial Statements and Exhibits, Other Events

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) May 6, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Commiss

May 6, 2025 8-K

UNITED STATES

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) May 5, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Commiss

May 1, 2025 EX-10.1

by and among Main Street Capital Corporation, the guarantors party thereto, Truist Bank, as administrative agent, and the lenders party thereto (previously filed as Exhibit 10.1 to Main Street Capital Corporation’s Current Report on Form 8-K filed on

Exhibit 10.1 EXECUTION COPY SEVENTH AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT This SEVENTH AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT, dated as of April 30, 2025 (this “Amendment”), by and among MAIN STREET CAPITAL CORPORATION, a Maryland corporation (the “Borrower”), solely with respect to Section 9, the GUARANTORS party hereto, the LENDERS party hereto (the “Lenders”

May 1, 2025 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

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) April 30, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Comm

May 1, 2025 EX-99.1

Main Street Capital Corporation

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Amendment of its Corporate Credit Facility Interest Rate Decreased Total Commit

April 25, 2025 EX-99.1

Main Street Capital Corporation

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Amendment of its SPV Credit Facility Interest Rate Reduced Final Maturity Date

April 25, 2025 8-K

UNITED STATES

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) April 24, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Comm

April 25, 2025 EX-10.1

successor collateral agent, successor document custodian, successor custodian and successor collateral administrator

Exhibit 10.1 EXECUTION COPY THIRD AMENDMENT TO CREDIT AGREEMENT (MSCC FUNDING I, LLC) THIS THIRD AMENDMENT TO CREDIT AGREEMENT, dated as of April 24, 2025 (this “Amendment”), is entered into by and among MSCC FUNDING I, LLC, a Delaware limited liability company, as borrower (the “Borrower”), MAIN STREET CAPITAL CORPORATION, a Maryland corporation, as collateral manager (the “Collateral Manager”),

April 16, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) April 16, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Comm

April 16, 2025 EX-99.1

Main Street Capital Corporation

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of First Quarter 2025 Operating Results Announces First Q

April 10, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) April 10, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Comm

April 10, 2025 EX-99.1

Main Street Announces First Quarter 2025 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces First Quarter 2025 Private Loan Portfolio Activity HOUSTON – April 10, 2025 –

March 24, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.           )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.           ) Filed by the Registrant Q Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2

March 5, 2025 EX-1.1

Form of Equity Distribution Agreement

Exhibit 1.1 Main Street Capital Corporation Up to 20,000,000 Shares of Common Stock (par value $0.01 per share) EQUITY DISTRIBUTION AGREEMENT [ ], 2025 [insert bank name] [insert bank address] Ladies and Gentlemen: Main Street Capital Corporation, a Maryland corporation (the “Company”), confirms its agreement (this “Agreement”) with [insert bank name] (the “Manager”), as follows: SECTION 1. Descri

March 5, 2025 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables N-2 Main Street Capital CORP Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, $0.

March 5, 2025 8-K

Financial Statements and Exhibits, Other Events

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) March 4, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Commi

March 5, 2025 424B2

Up to 20,000,000 Shares Common Stock

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration Statement No. 333-285405 PROSPECTUS SUPPLEMENT (to Prospectus dated February 28, 2025) Up to 20,000,000 Shares Common Stock We have entered into separate equity distribution agreements, each dated March 4, 2025, with RBC Capital Markets, LLC, Truist Securities, Inc., Raymond James & Associates, Inc., and B. Riley Securities, Inc., eac

March 4, 2025 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables N-2 Main Street Capital CORP Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, $0.

March 4, 2025 424B2

Up to 1,000,000 Shares Common Stock

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration Statement No. 333-285405 PROSPECTUS SUPPLEMENT (to Prospectus dated February 28, 2025) Up to 1,000,000 Shares Common Stock This prospectus supplement describes our Dividend Reinvestment and Direct Stock Purchase Plan, or the Plan, and the shares of our common stock, par value $0.01 per share, to be offered for purchase under the direc

February 28, 2025 N-2ASR

As filed with the Securities and Exchange Commission on February 28, 2025

Table of Contents As filed with the Securities and Exchange Commission on February 28, 2025 Securities Act File No.

February 28, 2025 EX-99.2

Rule 12d1-4 Fund of Funds Investment Agreement, dated January 20, 2025, by and between Main Street Capital Corporation and MSC Income Fund, Inc.

Exhibit 99.2 FUND OF FUNDS INVESTMENT AGREEMENT This FUND OF FUNDS INVESTMENT AGREEMENT (the “Agreement”), dated as of January 20, 2025, is between Main Street Capital Corporation, a Maryland corporation (the “Acquiring Fund”), and MSC Income Fund, Inc., a Maryland corporation (the “Acquired Fund” and, together with the Acquiring Fund, the “Funds”). WHEREAS, the Acquiring Fund is a closed-end mana

February 28, 2025 EX-10.28

Amended and Restated Investment Advisory and Administrative Services Agreement, dated January 29, 2024, by and between MSC Adviser I, LLC and MSC Income Fund, Inc. (previously filed as Exhibit 10.28 to Main Street Capital Corporation’s Annual Report on Form 10-K filed on February 28, 2025 (File No. 814-00746))

Exhibit 10.28 AMENDED AND RESTATED INVESTMENT ADVISORY AND ADMINISTRATIVE SERVICES AGREEMENT BETWEEN MSC INCOME FUND, INC. AND MSC ADVISER I, LLC This Amended and Restated Investment Advisory and Administrative Services Agreement (the “Agreement”) is made as of the 29th day of January 2025 (the “Effective Date”), by and between MSC INCOME FUND, INC., a Maryland corporation (the “Company”), and MSC

February 28, 2025 EX-99.N1

Consent of Grant Thornton LLP regarding Main Street Capital Corporation**

Exhibit (n)(1) CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We have issued our reports dated February 28, 2025 with respect to the consolidated financial statements, financial statement schedule and internal control over financial reporting of Main Street Capital Corporation for the year ended December 31, 2024 which are contained or incorporated by reference in this Registration Statement and Prospectus.

February 28, 2025 EX-99.1

1940 Act Code of Ethics

Exhibit 99.1 MAIN STREET CAPITAL CORPORATION MSC INCOME FUND, INC. MSC ADVISER I, LLC JOINT CODE OF ETHICS This Code of Ethics (the “Code”) has been adopted by the Board of Directors of each of Main Street Capital Corporation (“Main Street”) and MSC Income Fund, Inc. (“MSIF” and, together with Main Street, the “BDCs”) in accordance with Rule 17j-l(c) under the Investment Company Act of 1940, as am

February 28, 2025 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Fourth Quarter – 2024 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dat

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Fourth Quarter – 2024 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated February 28, 2025 Related to the Registration Statement No. 333-285405 mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital

February 28, 2025 EX-99.L

Opinion and Consent of Counsel**

Exhibit (l) 1900 K Street NW Washington, DC 20006 +1 202 261 3300 Main +1 202 261 3333 Fax www.

February 28, 2025 EX-FILING FEES

Filing Fee Table**

Calculation of Filing Fee Tables N-2 Main Street Capital CORP Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, $0.

February 28, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Number: 814-0

February 28, 2025 EX-19.1

nsider Trading Policy

Exhibit 19.1 MAIN STREET CAPITAL CORPORATION MSC INCOME FUND, INC. AND MSC ADVISER I, LLC STATEMENT OF POLICY ON INSIDER TRADING Introduction It is illegal for any person, either personally or on behalf of others, to trade in securities while in possession of material, non-public information. It is also illegal to communicate, or “tip,” material, non-public information to others who might be expec

February 28, 2025 EX-99.D6

Statement of Eligibility of Trustee on Form T-1 of The Bank of New York Mellon Trust Company, N.A., as trustee with respect to the Indenture under Exhibit (d)(5)**

Exhibit (d)(6) = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 27, 2025 EX-99.1

MAIN STREET ANNOUNCES 2024 FOURTH QUARTER AND ANNUAL RESULTS Fourth Quarter 2024 Net Investment Income of $1.02 Per Share Fourth Quarter 2024 Distributable Net Investment Income(1) of $1.08 Per Share Net Asset Value of $31.65 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES 2024 FOURTH QUARTER AND ANNUAL RESULTS Fourth Quarter 2024 Net Investment Inco

February 27, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) February 27, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (C

February 25, 2025 8-K

Financial Statements and Exhibits, Other Events

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) February 25, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (C

February 25, 2025 EX-99.1

Main Street Announces Second Quarter 2025 Regular Monthly Dividends and Supplemental Dividend Payable in March 2025 Regular Monthly Dividends of $0.25 Per Share for each of April, May and June 2025 Supplemental Dividend of $0.30 Per Share Payable in

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Second Quarter 2025 Regular Monthly Dividends and Supplemental Dividend Payabl

January 16, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) January 16, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Co

January 16, 2025 EX-99.1

Main Street Capital Corporation

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of Fourth Quarter 2024 Operating Results Announces Federa

January 10, 2025 EX-99.1

Main Street Announces Fourth Quarter 2024 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Fourth Quarter 2024 Private Loan Portfolio Activity HOUSTON – January 9, 2025

January 10, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) January 9, 2025 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Com

November 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Numb

November 8, 2024 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Third Quarter – 2024 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus date

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Third Quarter – 2024 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated November 8, 2024 Related to the Registration Statement No. 333-263258 mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.c

November 7, 2024 EX-99.1

MAIN STREET ANNOUNCES THIRD QUARTER 2024 RESULTS Third Quarter 2024 Net Investment Income of $1.00 Per Share Third Quarter 2024 Distributable Net Investment Income(1) of $1.06 Per Share Net Asset Value of $30.57 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES THIRD QUARTER 2024 RESULTS Third Quarter 2024 Net Investment Income of $1.00 P

November 7, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 7, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Co

November 5, 2024 8-K

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 5, 2024 Main Street Capit

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 5, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 814-00746 41-2230745 (State or other jurisdiction of incorporation) (Co

November 5, 2024 EX-99.1

Main Street Announces First Quarter 2025 Regular Monthly Dividends, Including a Monthly Dividend Increase, and Supplemental Dividend Payable in December 2024 Regular Monthly Dividends of $0.25 Per Share for each of January, February and March 2025 Mo

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces First Quarter 2025 Regular Monthly Dividends, Including a Monthly Dividend Inc

October 24, 2024 CORRESP

1900 K Street, NW

CORRESP 1 filename1.htm 1900 K Street, NW Washington, DC 20006-1110 +1 202 261 3300 Main +1 202 261 3333 Fax www.dechert.com HARRY S. PANGAS [email protected] +1 202 261 3466 Direct +1 202 261 3333 Fax October 24, 2024 Via EDGAR Christina DiAngelo Fettig, Senior Staff Accountant Division of Investment Management Disclosure Review and Accounting Office U.S. Securities and Exchange Commission

October 15, 2024 EX-99.1

Main Street Announces Preliminary Estimate of Third Quarter 2024 Operating Results Announces Third Quarter 2024 Earnings Release and Conference Call Schedule

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of Third Quarter 2024 Operating Results Announces Third Q

October 15, 2024 8-K

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) October 15, 2024 Main Street Capit

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) October 15, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

October 10, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) October 10, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

October 10, 2024 EX-99.1

Main Street Announces Third Quarter 2024 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO & Treasurer, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Third Quarter 2024 Private Loan Portfolio Activity HOUSTON – Octob

October 1, 2024 8-K

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) September 26, 2024 Main Street Cap

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) September 26, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (

October 1, 2024 EX-10.1

Second Amendment, dated as of September 26, 2024, to Credit Agreement by and among MSCC Funding I, LLC, as the borrower, Main Street Capital Corporation, as the collateral manager, the lenders from time to time party thereto, Truist Bank, as administrative agent and swingline lender, Citibank, N.A., as collateral agent, document custodian and custodian, and Virtus Group, L.P., as collateral administrator

Exhibit 10.1 EXECUTION COPY SECOND AMENDMENT TO CREDIT AGREEMENT (MSCC FUNDING I, LLC) THIS SECOND AMENDMENT TO CREDIT AGREEMENT, dated as of September 26, 2024 (this “Amendment”), is entered into by and among MSCC FUNDING I, LLC, a Delaware limited liability company, as borrower (the “Borrower”), MAIN STREET CAPITAL CORPORATION, a Maryland corporation, as collateral manager (the “Collateral Manag

October 1, 2024 EX-99.1

Main Street Capital Corporation

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Amendment of its SPV Credit Facility Total Commitments Increased to $600.0 Mill

September 13, 2024 EX-FILING FEES

Calculation of Filing Fee Tables 424(b)(2) (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Fees to Be Paid Debt 6.

September 13, 2024 424B2

6.500% Notes due 2027

Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-263258 PROSPECTUS SUPPLEMENT (to Prospectus dated March 3, 2022) $100,000,000 6.500% Notes due 2027 We are offering $100,000,000 in aggregate principal amount of 6.500% notes due 2027, which we refer to as the Notes. The Notes will mature on June 4, 2027. We will pay interest on the Notes on June 4 and December 4 of each year, beginn

September 13, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) September 11, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (

September 13, 2024 EX-1.1

Underwriting Agreement, dated September 11, 2024, between Main Street Capital Corporation and Truist Securities, Inc. as representative of the underwriters named in Schedule A thereto

Exhibit 1.1 Main Street Capital Corporation (a Maryland Corporation) $100,000,000 6.500% Notes due 2027 Underwriting Agreement September 11, 2024 Truist Securities, Inc. As representative of the several Underwriters named on Schedule A c/o Truist Securities, Inc. 3333 Peachtree Road NE Atlanta, Georgia 30326 Ladies and Gentlemen: Main Street Capital Corporation, a Maryland corporation (the “Compan

September 11, 2024 FWP

MAIN STREET CAPITAL CORPORATION 6.500% Notes due 2027 PRICING TERM SHEET September 11, 2024

Filed Pursuant to Rule 433 Issuer Free Writing Prospectus dated September 11, 2024 Relating to Preliminary Prospectus Supplement dated September 11, 2024 and Prospectus dated March 3, 2022 Registration No.

September 11, 2024 424B2

The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission and become effective under the Securities A

Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-263258 The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission and become effective under the Securities Act of 1933, as amended. This preliminary prospectus supplement and the accompa

September 10, 2024 EX-99.1

MSC Income Fund, Inc. Files Definitive Proxy Statement in Connection with Potential Listing of its Shares on a National Securities Exchange

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Ryan R. Nelson, CFO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MSC Income Fund, Inc. Files Definitive Proxy Statement in Connection with Potential Listing of its S

September 10, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) September 10, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (

August 12, 2024 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Second Quarter – 2024 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dat

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Second Quarter – 2024 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated August 12, 2024 Related to the Registration Statement No. 333-263258 mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.c

August 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Number: 0

August 8, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) August 8, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

August 8, 2024 EX-99.1

MAIN STREET ANNOUNCES SECOND QUARTER 2024 RESULTS Second Quarter 2024 Net Investment Income of $1.01 Per Share Second Quarter 2024 Distributable Net Investment Income(1) of $1.07 Per Share Net Asset Value of $29.80 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES SECOND QUARTER 2024 RESULTS Second Quarter 2024 Net Investment Income

August 6, 2024 EX-99.1

Main Street Announces Fourth Quarter 2024 Regular Monthly Dividends and Supplemental Dividend Payable in September 2024 Regular Monthly Dividends of $0.245 per Share for each of October, November and December 2024 Supplemental Dividend of $0.30 per S

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Fourth Quarter 2024 Regular Monthly Dividends and Supplemental Divide

August 6, 2024 8-K

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) August 6, 2024 Main Street Capital

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) August 6, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

July 25, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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) July 25, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commi

July 25, 2024 EX-99.1

MSC Income Fund, Inc. Files Preliminary Proxy Statement in Connection with Potential Listing of its Shares on a National Securities Exchange

Exhibit 99.1 MSC Income Fund, Inc. Files Preliminary Proxy Statement in Connection with Potential Listing of its Shares on a National Securities Exchange HOUSTON – July 25, 2024 – Main Street Capital Corporation (NYSE: MAIN) (“Main Street”) is pleased to announce that MSC Income Fund, Inc. (“MSC Income”), a non-listed business development company (“BDC”) for which Main Street’s wholly owned regist

July 25, 2024 DEFA14A

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) July 25, 2024 Main Street Capital

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) July 25, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commi

July 16, 2024 EX-99.1

Main Street Announces Preliminary Estimate of Second Quarter 2024 Operating Results Announces Second Quarter 2024 Earnings Release and Conference Call Schedule

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of Second Quarter 2024 Operating Results Announc

July 16, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) July 16, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commi

July 11, 2024 EX-99.1

Main Street Announces Second Quarter 2024 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Second Quarter 2024 Private Loan Portfolio Activity HOUSTON – July 11

July 11, 2024 8-K

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) July 11, 2024 Main Street Capital

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) July 11, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commi

June 28, 2024 EX-99.1

Main Street Announces Amendment of its Corporate Credit Facility Total Commitments Increased to $1.110 Billion and Final Maturity of the Facility Extended to June 2029

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Amendment of its Corporate Credit Facility Total Commitments Increase

June 28, 2024 EX-10.1

Sixth Amendment, dated as of June 27, 2024, to the Third Amended and Restated Credit Agreement by and among Main Street Capital Corporation, the guarantors party thereto, Truist Bank, as administrative agent, and the lenders party thereto (previously filed as Exhibit 10.1 to Main Street Capital Corporation’s Current Report on Form 8-K filed on June 28, 2024 (File No. 814-00746))

Exhibit 10.1 EXECUTION COPY SIXTH AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT This SIXTH AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) is dated as of June 27, 2024, by and among MAIN STREET CAPITAL CORPORATION, a Maryland corporation (the “Borrower”), TRUIST BANK (the “Administrative Agent”) and the LENDERS party hereto (the “Lenders”). R E C I T A L S: W

June 28, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

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) June 27, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commi

June 20, 2024 8-K

Regulation FD Disclosure

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) June 20, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commi

June 4, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) June 4, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commis

June 4, 2024 EX-4.1

as Exhibits 4.1 and 4.2 to Main Street’s Current Report on Form 8-K filed on June 4, 2024

Exhibit 4.1 SEVENTH SUPPLEMENTAL INDENTURE between MAIN STREET CAPITAL CORPORATION and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee Dated as of June 4, 2024 SEVENTH SUPPLEMENTAL INDENTURE THIS SEVENTH SUPPLEMENTAL INDENTURE (this “Seventh Supplemental Indenture”), dated as of June 4, 2024, is between Main Street Capital Corporation, a Maryland corporation (the “Company”), and The Ba

May 30, 2024 EX-99.1

FIFTH AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT

Exhibit 99.1 FIFTH AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT This FIFTH AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) is dated as of May 26, 2024, by and among MAIN STREET CAPITAL CORPORATION, a Maryland corporation (the “Borrower”), TRUIST BANK (the “Administrative Agent”) and the LENDERS party hereto constituting the Required Lenders (as defined in th

May 30, 2024 EX-1.1

Main Street Capital Corporation (a Maryland Corporation) 6.500% Notes due 2027 Underwriting Agreement

Exhibit 1.1 Main Street Capital Corporation (a Maryland Corporation) $300,000,000 6.500% Notes due 2027 Underwriting Agreement May 28, 2024 Truist Securities, Inc. As representative of the several Underwriters named on Schedule A c/o Truist Securities, Inc. 3333 Peachtree Road NE Atlanta, Georgia 30326 Ladies and Gentlemen: Main Street Capital Corporation, a Maryland corporation (the “Company”), c

May 30, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) May 26, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commis

May 29, 2024 EX-FILING FEES

Calculation of Filing Fee Tables 424(b)(2) (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Fees to Be Paid Debt 6.

May 29, 2024 424B2

6.500% Notes due 2027

Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-263258  PROSPECTUS SUPPLEMENT (to Prospectus dated March 3, 2022) $300,000,000 6.500% Notes due 2027 We are offering $300,000,000 in aggregate principal amount of 6.500% notes due 2027, which we refer to as the Notes. The Notes will mature on June 4, 2027. We will pay interest on the Notes on June 4 and December 4 of each year, begin

May 28, 2024 424B2

The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission and become effective under the Securities A

Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-263258  The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission and become effective under the Securities Act of 1933, as amended. This preliminary prospectus supplement and the accomp

May 28, 2024 FWP

MAIN STREET CAPITAL CORPORATION 6.500% Notes due 2027 PRICING TERM SHEET May 28, 2024

Filed Pursuant to Rule 433 Issuer Free Writing Prospectus dated May 28, 2024 Relating to Preliminary Prospectus Supplement dated May 28, 2024 and Prospectus dated March 3, 2022 Registration No.

May 13, 2024 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation First Quarter – 2024 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus date

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation First Quarter – 2024 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated May 10, 2024 Related to the Registration Statement No. 333-263258 mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com P

May 10, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Number:

May 9, 2024 EX-99.1

MAIN STREET ANNOUNCES FIRST QUARTER 2024 RESULTS First Quarter 2024 Net Investment Income of $1.05 Per Share First Quarter 2024 Distributable Net Investment Income(1) of $1.11 Per Share Net Asset Value of $29.54 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES FIRST QUARTER 2024 RESULTS First Quarter 2024 Net Investment Income o

May 9, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) May 9, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commiss

May 7, 2024 EX-99.1

Main Street Announces Third Quarter 2024 Regular Monthly Dividends, Including a Monthly Dividend Increase, and Supplemental Dividend Payable in June 2024 Regular Monthly Dividends of $0.245 per Share for each of July, August and September 2024 Monthl

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Third Quarter 2024 Regular Monthly Dividends, Including a Monthly Div

May 7, 2024 8-K

Submission of Matters to a Vote of Security Holders

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) May 6, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commiss

May 7, 2024 8-K

Financial Statements and Exhibits, Other Events

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) May 7, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commiss

April 16, 2024 EX-99.1

Main Street Announces Preliminary Estimate of First Quarter 2024 Operating Results Announces First Quarter 2024 Earnings Release and Conference Call Schedule

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of First Quarter 2024 Operating Results Announce

April 16, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) April 16, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

April 11, 2024 EX-99.1

Main Street Announces First Quarter 2024 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces First Quarter 2024 Private Loan Portfolio Activity HOUSTON – April 11

April 11, 2024 8-K

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) April 11, 2024 Main Street Capital

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) April 11, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

March 25, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.           )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.           ) Filed by the Registrant Q Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2

February 26, 2024 FWP

Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated February 23, 2024 Related to the Registration Statement No. 333-263258

Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated February 23, 2024 Related to the Registration Statement No. 333-263258

February 23, 2024 EX-97.1

Main Street Capital Corporation Clawback Policy, effective December 1, 2023

Exhibit 97.1 MAIN STREET CAPITAL CORPORATION CLAWBACK POLICY The Board of Directors (the Board) of Main Street Capital Corporation (the Company) believes that it is in the best interests of the Company and its shareholders to adopt this Clawback Policy (the Policy), which provides for the recovery of certain incentive compensation in the event of an Accounting Restatement (as defined below). This

February 23, 2024 EX-99.1

1940 Act Code of Ethics

Exhibit 99.1 MAIN STREET CAPITAL CORPORATION MSC INCOME FUND, INC. MSC ADVISER I, LLC JOINT CODE OF ETHICS This Code of Ethics (the “Code”) has been adopted by the Board of Directors of each of Main Street Capital Corporation (“Main Street”) and MSC Income Fund, Inc. (“MSIF” and, together with Main Street, the “BDCs”) in accordance with Rule 17j-l(c) under the Investment Company Act of 1940, as am

February 23, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Number: 001-3

February 23, 2024 EX-21.1

List of Subsidiaries

Exhibit 21.1 LIST OF SUBSIDIARIES Main Street Capital Partners, LLC, a Delaware limited liability company Main Street Equity Interests, Inc., a Delaware corporation Main Street Mezzanine Management, LLC, a Delaware limited liability company Main Street Mezzanine Fund, LP, a Delaware limited partnership Main Street Capital III GP, LLC, a Delaware limited liability company Main Street Capital III, L

February 22, 2024 EX-99.1

MAIN STREET ANNOUNCES 2023 FOURTH QUARTER AND ANNUAL RESULTS Fourth Quarter 2023 Net Investment Income of $1.07 Per Share Fourth Quarter 2023 Distributable Net Investment Income(1) of $1.12 Per Share Net Asset Value of $29.20 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES 2023 FOURTH QUARTER AND ANNUAL RESULTS Fourth Quarter 2023 Net Invest

February 22, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) February 22, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (C

February 21, 2024 8-K

Financial Statements and Exhibits, Other Events

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) February 21, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (C

February 21, 2024 EX-99.1

Main Street Announces Second Quarter 2024 Regular Monthly Dividends and Supplemental Dividend Payable in March 2024 Regular Monthly Dividends of $0.24 per Share for each of April, May and June 2024 Supplemental Dividend of $0.30 per Share Payable in

EX-99.1 2 main-2024221xexx991.htm EX-99.1 Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Second Quarter 2024 Regular

January 17, 2024 EX-99.1

Main Street Announces Preliminary Estimate of Fourth Quarter 2023 Operating Results Announces Federal Tax Treatment of 2023 Dividends Announces Fourth Quarter and Full Year 2023 Earnings Release and Conference Call Schedule

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of Fourth Quarter 2023 Operating Results Announc

January 17, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) January 17, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

January 16, 2024 8-K

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) January 16, 2024 Main Street Capit

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) January 16, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

January 16, 2024 EX-99.1

Main Street Announces Fourth Quarter 2023 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Fourth Quarter 2023 Private Loan Portfolio Activity HOUSTON – January

January 12, 2024 8-K

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) January 10, 2024 Main Street Capit

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) January 10, 2024 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

January 12, 2024 EX-4.1

Sixth Supplemental Indenture relating to the March 2029 Notes, dated January 12, 2024, between Main Street Capital Corporation and The Bank of New York Mellon Trust Company, N.A., as trustee (previously filed as Exhibit 4.1 to Main Street Capital Corporation’s Current Report on Form 8-K filed on January 12, 2024 (File No. 1-33723))

Exhibit 4.1 SIXTH SUPPLEMENTAL INDENTURE between MAIN STREET CAPITAL CORPORATION and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee Dated as of January 12, 2024 SIXTH SUPPLEMENTAL INDENTURE THIS SIXTH SUPPLEMENTAL INDENTURE (this “Sixth Supplemental Indenture”), dated as of January 12, 2024, is between Main Street Capital Corporation, a Maryland corporation (the “Company”), and The Ba

January 12, 2024 EX-1.1

Main Street Capital Corporation (a Maryland Corporation) 6.950% Notes due 2029 Underwriting Agreement

Exhibit 1.1 Main Street Capital Corporation (a Maryland Corporation) $350,000,000 6.950% Notes due 2029 Underwriting Agreement January 10, 2024 SMBC Nikko Securities America, Inc. As representative of the several Underwriters named on Schedule A c/o SMBC Nikko Securities America, Inc. 277 Park Avenue, 5th Floor New York, NY 10172 Attention: Debt Capital Markets Ladies and Gentlemen: Main Street Ca

January 11, 2024 424B2

6.95% Notes due 2029

Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-263258  PROSPECTUS SUPPLEMENT (to Prospectus dated March 3, 2022) $350,000,000 6.95% Notes due 2029 We are offering $350,000,000 in aggregate principal amount of 6.95% notes due 2029, which we refer to as the Notes. The Notes will mature on March 1, 2029. We will pay interest on the Notes on March 1 and September 1 of each year, begi

January 11, 2024 EX-FILING FEES

Calculation of Filing Fee Tables 424(b)(2) (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Fees to Be Paid Debt 6.

January 10, 2024 FWP

MAIN STREET CAPITAL CORPORATION 6.950% Notes due 2029 PRICING TERM SHEET January 10, 2024

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.

January 10, 2024 424B2

The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission and become effective under the Securities A

Filed Pursuant to Rule 424(b)(2)  Registration Statement No. 333-263258  The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission and become effective under the Securities Act of 1933, as amended. This preliminary prospectus supplement and the accomp

November 8, 2023 424B3

Up to 15,000,000 Shares Common Stock

Filed Pursuant to Rule 424(b)(3)  Registration Statement No. 333-263258  Supplement No. 2, dated November 7, 2023 to Prospectus Supplement, dated March 3, 2022 (to Prospectus dated March 3, 2022) Up to 15,000,000 Shares Common Stock This supplement (this “Supplement”) is being filed to update, amend and supplement certain information in the prospectus of Main Street Capital Corporation (the “Compa

November 6, 2023 FWP

FWP

November 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Numb

November 2, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 2, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

November 2, 2023 EX-99.1

MAIN STREET ANNOUNCES THIRD QUARTER 2023 RESULTS Third Quarter 2023 Net Investment Income of $0.99 Per Share Third Quarter 2023 Distributable Net Investment Income(1) of $1.04 Per Share Net Asset Value of $28.33 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES THIRD QUARTER 2023 RESULTS Third Quarter 2023 Net Investment Income o

November 1, 2023 8-K

Financial Statements and Exhibits, Other Events

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 1, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

November 1, 2023 EX-99.1

Main Street Announces First Quarter 2024 Regular Monthly Dividends, Including a Monthly Dividend Increase, and Supplemental Dividend Payable in December 2023 Regular Monthly Dividends of $0.24 per Share for each of January, February and March 2024 Mo

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces First Quarter 2024 Regular Monthly Dividends, Including a Monthly Div

October 17, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) October 17, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

October 17, 2023 EX-99.1

Main Street Announces Preliminary Estimate of Third Quarter 2023 Operating Results Announces Third Quarter 2023 Earnings Release and Conference Call Schedule

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of Third Quarter 2023 Operating Results Announce

October 13, 2023 EX-10.1

EverBank Joinder Agreement, dated October 12, 2023

Exhibit 10.1 Certain portions of this document have been omitted pursuant to Items 601(b)(10)(vi) of Regulation S-K and, where applicable, have been marked with “[***]” to indicate where omissions have been made. A copy of any omitted portion will be furnished supplementally to the Securities and Exchange Commission upon request; provided, however, that the registrant may request confidential trea

October 13, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

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) October 12, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

October 13, 2023 EX-99.1

Main Street Announces Increase in Commitments Under its SPV Credit Facility Total Commitments Increased to $430 Million

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Increase in Commitments Under its SPV Credit Facility Total Commitmen

October 12, 2023 EX-99.1

Main Street Announces Third Quarter 2023 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Third Quarter 2023 Private Loan Portfolio Activity HOUSTON – October

October 12, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) October 12, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

October 12, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) October 5, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Com

October 12, 2023 EX-10.1

, 2023, by and among Western Alliance Bank, as additional lender and syndication agent, Truist Bank, as administrative agent, and MSCC Funding I, LLC, as the borrower (previously filed as Exhibit 10.1 to Main Street Capital Corporation’s Current Report on Form 8-K filed on October

Exhibit 10.1 Certain portions of this document have been omitted pursuant to Items 601(b)(10)(vi) of Regulation S-K and, where applicable, have been marked with “[***]” to indicate where omissions have been made. A copy of any omitted portion will be furnished supplementally to the Securities and Exchange Commission upon request; provided, however, that the registrant may request confidential trea

August 4, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Number: 0

August 4, 2023 EX-10.1

Response to Notice of Increase Request, dated July 26, 2023, by and among Main Street Capital Corporation and Sumitomo Mitsui Banking Corporation (previously filed as Exhibit 10.1 to Main Street Capital Corporation’s Quarterly Report on Form 10-Q filed on August 4, 2023 (File No.

Exhibit 10.1 NOTICE OF COMMITMENT INCREASE REQUEST Truist Bank 3333 Peachtree Road, 8th Floor Atlanta, Georgia 30326 Attention: Hays Wood Phone: 404-836-5879 July 26, 2023 Ladies and Gentlemen: This Commitment Increase Request (this “Commitment Increase Request”) is delivered pursuant to Section 2.14 of the Third Amended and Restated Credit Agreement, dated as of June 5, 2018 (as amended, amended

August 4, 2023 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Second Quarter – 2023 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dat

q22023maincombinedpresen mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Second Quarter – 2023 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated August 4, 2023 Related to Registration Statement No. 333-263258 mainstcapital.comNYSE: MAINMain Street Capital Corporation

August 3, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) August 3, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

August 3, 2023 EX-99.1

MAIN STREET ANNOUNCES SECOND QUARTER 2023 RESULTS Second Quarter 2023 Net Investment Income of $1.06 Per Share Second Quarter 2023 Distributable Net Investment Income(1) of $1.12 Per Share Net Asset Value of $27.69 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES SECOND QUARTER 2023 RESULTS Second Quarter 2023 Net Investment Income

August 2, 2023 EX-99.1

Main Street Announces Fourth Quarter 2023 Regular Monthly Dividends, Including a Monthly Dividend Increase, and Supplemental Dividend Payable in September 2023 Regular Monthly Dividends of $0.235 per Share for each of October, November and December 2

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Fourth Quarter 2023 Regular Monthly Dividends, Including a Monthly Di

August 2, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

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) August 2, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

July 18, 2023 EX-99.1

Main Street Announces Preliminary Estimate of Second Quarter 2023 Operating Results Announces Second Quarter 2023 Earnings Release and Conference Call Schedule

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of Second Quarter 2023 Operating Results Announc

July 18, 2023 8-K

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) July 18, 2023 Main Street Capital

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) July 18, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commi

July 13, 2023 EX-99.1

Main Street Announces Second Quarter 2023 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Second Quarter 2023 Private Loan Portfolio Activity HOUSTON – July 13

July 13, 2023 8-K

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) July 13, 2023 Main Street Capital

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) July 13, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commi

June 22, 2023 8-K

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) June 22, 2023 Main Street Capital

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) June 22, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commi

June 1, 2023 8-K

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) May 31, 2023 Main Street Capital C

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) May 31, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commis

June 1, 2023 424B3

Up to 15,000,000 Shares Common Stock

Filed Pursuant to Rule 424(b)(3)  Registration Statement No. 333-263258  Supplement No. 1, dated June 1, 2023 to Prospectus Supplement, dated March 3, 2022 (to Prospectus dated March 3, 2022) Up to 15,000,000 Shares Common Stock This supplement (this “Supplement”) is being filed to update, amend and supplement certain information in the prospectus of Main Street Capital Corporation (the “Company”)

May 5, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Number:

May 5, 2023 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation First Quarter – 2023 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus date

q12023maininvestorpresen mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation First Quarter – 2023 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated May 5, 2023 Related to Registration Statement No. 333-263258 mainstcapital.comNYSE: MAINMain Street Capital Corporation www

May 4, 2023 8-K

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) May 4, 2023 Main Street Capital Co

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) May 4, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commiss

May 4, 2023 EX-99.1

MAIN STREET ANNOUNCES 2023 FIRST QUARTER RESULTS First Quarter 2023 Net Investment Income of $1.02 Per Share First Quarter 2023 Distributable Net Investment Income(1) of $1.07 Per Share Net Asset Value of $27.23 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES 2023 FIRST QUARTER RESULTS First Quarter 2023 Net Investment Income o

May 2, 2023 EX-99.1

Main Street Announces Third Quarter 2023 Regular Monthly Dividends, Including a Monthly Dividend Increase, and Supplemental Dividend Payable in June 2023 Regular Monthly Dividends of $0.23 per Share for each of July, August and September 2023 Monthly

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Third Quarter 2023 Regular Monthly Dividends, Including a Monthly Div

May 2, 2023 8-K

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) May 1, 2023 Main Street Capital Co

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) May 1, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Commiss

April 18, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) April 18, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

April 18, 2023 EX-99.1

Main Street Announces Preliminary Estimate of First Quarter 2023 Operating Results Announces First Quarter 2023 Earnings Release and Conference Call Schedule

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of First Quarter 2023 Operating Results Announce

April 12, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) April 12, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

April 12, 2023 EX-99.1

Main Street Announces First Quarter 2023 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces First Quarter 2023 Private Loan Portfolio Activity HOUSTON – April 12

March 20, 2023 8-K

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) March 20, 2023 Main Street Capital

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) March 20, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

March 20, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.           )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.           ) Filed by the Registrant Q Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2

March 14, 2023 8-K

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) March 13, 2023 Main Street Capital

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) March 13, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Comm

February 24, 2023 EX-10.8

Joinder Agreement and Supplement, dated January 13, 2023, to the Third Amended and Restated Credit Agreemen

Exhibit 10.8 EXECUTION COPY RESPONSE TO NOTICE INCREASE REQUEST January 13, 2023 Truist Bank 3333 Peachtree Road, 8th Floor Atlanta, Georgia 30326 Attention: Hays Wood Phone: 404-836-5879 Re: Main Street Capital Corporation (the “Company”) Ladies and Gentlemen: We refer to (a) that certain Third Amended and Restated Credit Agreement, dated as of June 5, 2018 (as amended, restated, supplemented, am

February 24, 2023 EX-14.1

Business Conduct and Ethics

Exhibit 14.1 MAIN STREET CAPITAL CORPORATION CODE OF BUSINESS CONDUCT AND ETHICS November 2020 CODE OF BUSINESS CONDUCT AND ETHICS TABLE OF CONTENTS Page Introduction 1 Purpose of the Code 1 Conflicts of Interest 1 Corporate Opportunities 2 Confidentiality 2 Fair Dealing 2 Protection and Proper Use of Company Assets 3 Compliance with Applicable Laws, Rules and Regulations 3 Equal Opportunity, Hara

February 24, 2023 EX-21.1

List of Subsidiaries

Exhibit 21.1 LIST OF SUBSIDIARIES Main Street Capital Partners, LLC, a Delaware limited liability company Main Street Mezzanine Management, LLC, a Delaware limited liability company Main Street Equity Interests, Inc., a Delaware corporation Main Street Mezzanine Fund, LP, a Delaware limited partnership Main Street Capital III GP, LLC, a Delaware limited liability company Main Street Capital III, L

February 24, 2023 EX-10.12

First Amendment to Credit Agreement, dated as of February 2, 2023, among MSCC Funding I, LLC, as the borrower, Main Street Capital Corporation, as the collateral manager, the lenders party thereto, Truist Bank, as administrative agent and swingline lender, Citibank N.A., as collateral agent document custodian and custodian and Virtus Group, L.P., as collateral administrator

Exhibit 10.12 EXECUTION COPY FIRST AMENDMENT TO CREDIT AGREEMENT (MSCC FUNDING I, LLC) THIS FIRST AMENDMENT TO CREDIT AGREEMENT, dated as of February 2, 2023 (this “Amendment”), is entered into by and among MSCC FUNDING I, LLC, a Delaware limited liability company, as borrower (the “Borrower”), MAIN STREET CAPITAL CORPORATION, a Maryland corporation, as collateral manager (the “Collateral Manager”

February 24, 2023 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Fourth Quarter – 2022 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dat

q42022maininvestorandlen mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Fourth Quarter – 2022 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated February 24, 2023 Relating to Registration Statement No. 333-263258 mainstcapital.comNYSE: MAINMain Street Capital Corpora

February 24, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Number: 001-3

February 24, 2023 EX-10.14

First Supplement to Note Purchase Agreement, dated as of February 2, 2023, by and among Main Street Capital Corporation and the Purchasers party thereto

Exhibit 10.14 Execution Version Main Street Capital Corporation First Supplement to Master Note Purchase Agreement Dated as of February 2, 2023 Re: $50,000,000 7.53% Series B Senior Notes Due December 23, 2025 Main Street Capital Corporation Dated as of February 2, 2023 To the Additional Purchasers named in Schedule A hereto Ladies and Gentlemen: This First Supplement to Master Note Purchase Agree

February 24, 2023 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.           )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.           ) Filed by the Registrant Q Filed by a Party other than the Registrant o Check the appropriate box: Q Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2

February 23, 2023 EX-99.1

MAIN STREET ANNOUNCES 2022 FOURTH QUARTER AND ANNUAL RESULTS Fourth Quarter 2022 Net Investment Income of $0.98 Per Share Fourth Quarter 2022 Distributable Net Investment Income(1) of $1.03 Per Share Net Asset Value of $26.86 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES 2022 FOURTH QUARTER AND ANNUAL RESULTS Fourth Quarter 2022 Net Invest

February 23, 2023 8-K

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) February 23, 2023 Main Street Capi

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) February 23, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (C

February 22, 2023 8-K

Financial Statements and Exhibits, Other Events

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) February 22, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (C

February 22, 2023 EX-99.1

Main Street Announces Second Quarter 2023 Regular Monthly Dividends and Supplemental Dividend Payable in March 2023 Regular Monthly Dividends of $0.225 per Share for each of April, May and June 2023 Supplemental Dividend of $0.175 per Share Payable i

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Second Quarter 2023 Regular Monthly Dividends and Supplemental Divide

February 2, 2023 EX-99.1

Main Street Announces Issuance of an Additional $50.0 Million of Investment Grade Notes

EX-99.1 2 main-202322xexx991.htm EX-99.1 Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Issuance of an Additional $5

February 2, 2023 8-K

Financial Statements and Exhibits, Other Events

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) February 2, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

January 18, 2023 EX-99.1

Main Street Announces Increase in Commitments Under its Credit Facility Total Commitments Increased to $980 Million

EX-99.1 2 main-2023118xexx991.htm EX-99.1 Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Increase in Commitments Und

January 18, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

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) January 13, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

January 17, 2023 8-K

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) January 17, 2023 Main Street Capit

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) January 17, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

January 17, 2023 EX-99.1

Main Street Announces Preliminary Estimate of Fourth Quarter 2022 Operating Results Announces Federal Tax Treatment of 2022 Dividends Announces Fourth Quarter and Full Year 2022 Earnings Release and Conference Call Schedule

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of Fourth Quarter 2022 Operating Results Announc

January 12, 2023 8-K

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) January 12, 2023 Main Street Capit

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) January 12, 2023 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

January 12, 2023 EX-99.1

Main Street Announces Fourth Quarter 2022 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Fourth Quarter 2022 Private Loan Portfolio Activity HOUSTON – January

December 28, 2022 EX-10.1

and the Purchasers party thereto (previously filed as Exhibit 10.1 to Main Street Capital Corporation’s Current Report on Form 8-K filed on December 27, 2022 (File No. 1-33723))

Exhibit 10.1 Main Street Capital Corporation $100,000,000 7.84% Series A Senior Notes due December 23, 2025 Master Note Purchase Agreement Dated December 23, 2022 4362430 Table of Contents Section Heading Page Section 1. Authorization of Notes. 1 Section 1.1. Authorization of Series A Notes 1 Section 1.2. Changes in Interest Rate 1 Section 2. Sale and Purchase of Notes. 3 Section 2.1. Sale and Pur

December 28, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

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) December 22, 2022 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (C

December 28, 2022 EX-99.1

Main Street Announces Completion of $100.0 Million Investment Grade Notes Offering

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Completion of $100.0 Million Investment Grade Notes Offering HOUSTON,

December 28, 2022 EX-10.2

Fourth Amendment, dated as of December 22, 2022, to the Third Amended and Restated Credit Agreement by and among Main Street, the guarantors party thereto, Truist Bank, as administrative agent, and the lenders party thereto

Exhibit 10.2 FOURTH AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT This FOURTH AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) is dated as of December 22, 2022, by and among MAIN STREET CAPITAL CORPORATION, a Maryland corporation (the “Borrower”), TRUIST BANK (the “Administrative Agent”) and the lenders party hereto (the “Lenders”). R E C I T A L S: WHEREAS, t

December 15, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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) December 14, 2022 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (C

December 6, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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) December 6, 2022 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

December 6, 2022 EX-10.1

Lender Joinder Agreement, dated December 6, 2022, to the Revolving Credit and Security Agreement (previously filed as Exhibit 10.1 to Main Street Capital Corporation’s Current Report on Form 8-K filed on December 6, 2022 (File No. 1-33723))

Exhibit 10.1 Lender Joinder Agreement December 6, 2022 This Lender Joinder Agreement (this ?Joinder?) is delivered pursuant to Section 2.18 of that certain Revolving Credit and Security Agreement dated as of November 22, 2022 (as the same may from time to time be amended, restated, supplemented, waived or modified, the ?Credit Agreement?) among MSCC Funding I, LLC, a Delaware limited liability com

November 28, 2022 EX-99.1

Main Street Announces New $240 Million Secured Credit Facility

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces New $240 Million Secured Credit Facility HOUSTON, November 28, 2022 –

November 28, 2022 EX-10.1

, as administrative agent and swingline lender, Citibank N.A., as collateral agent, document custodian and custodian and Virtus Group, L.P. as collateral administrator (previously filed as Exhibit 10.1 to Main Street Capital Corporation’s Current Report on Form 8-K filed on November 28, 2022 (File No. 1-33723))

Exhibit 10.1 Revolving Credit and Security Agreement among MSCC Funding I, LLC, as Borrower, Main Street Capital Corporation, as Collateral Manager the Lenders from time to time parties hereto, Truist Bank, as Administrative Agent and Swingline Lender Citibank, N.A., as Collateral Agent, as Document Custodian and as Custodian and Virtus Group, LP, as Collateral Administrator Dated as of November 2

November 28, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

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 22, 2022 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (C

November 28, 2022 EX-10.2

Purchase and Contribution Agreement, dated as of November 22, 2022, among Main Street Capital Corporation, as the seller, and MSCC Funding I, LLC, as the buyer (previously filed as Exhibit 10.2 to Main Street Capital Corporation’s Current Report on Form 8-K filed on November 28, 2022 (File No. 1-33723))

Exhibit 10.2 Purchase and Contribution Agreement by and between MSCC Funding I, LLC as Buyer and Main Street Capital Corporation as Seller Dated as of November 22, 2022 TABLE OF CONTENTS Page ARTICLE I GENERAL 1 Section 1.1 Certain Defined Terms 1 Section 1.2 Other Definitional Provisions 2 ARTICLE II SALE AND CONVEYANCE 3 Section 2.1 Sale 3 Section 2.2 Assignments, Etc 6 ARTICLE III PURCHASE PRIC

November 4, 2022 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Debt Capital Markets Presentation Third Quarter – 2022 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Pro

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Debt Capital Markets Presentation Third Quarter ? 2022 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated November 4, 2022 Relating to Registration Statement No. 333-263258 mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainst

November 4, 2022 FWP

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Third Quarter – 2022 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus date

mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com Page 1 Investor Presentation Third Quarter ? 2022 Main St et Capital Corporation NYSE: IN mainstc ital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated November 4, 2022 Relating to Registration Statement No. 333-263258 mainstcapital.comNYSE: MAINMain Street Capital Corporation www.mainstcapital.com

November 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to Commission File Numb

November 3, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 3, 2022 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

November 3, 2022 EX-99.1

MAIN STREET ANNOUNCES THIRD QUARTER 2022 RESULTS Third Quarter 2022 Net Investment Income of $0.83 Per Share Third Quarter 2022 Distributable Net Investment Income(1) of $0.88 Per Share Net Asset Value of $25.94 Per Share

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 MAIN STREET ANNOUNCES THIRD QUARTER 2022 RESULTS Third Quarter 2022 Net Investment Income o

November 2, 2022 EX-99.1

Main Street Announces First Quarter 2023 Regular Monthly Dividends, Including a Monthly Dividend Increase, and Supplemental Dividend Payable in December 2022 Regular Monthly Dividends of $0.225 per Share for each of January, February and March 2023 M

EX-99.1 2 main-2022112xexx991.htm EX-99.1 Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces First Quarter 2023 Regular

November 2, 2022 8-K

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 2, 2022 Main Street Capit

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 2, 2022 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

October 18, 2022 EX-99.1

Main Street Announces Preliminary Estimate of Third Quarter 2022 Operating Results

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Preliminary Estimate of Third Quarter 2022 Operating Results HOUSTON

October 18, 2022 8-K

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) October 18, 2022 Main Street Capit

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) October 18, 2022 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

October 14, 2022 EX-99.1

Main Street Announces Third Quarter 2022 Private Loan Portfolio Activity

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 Main Street Announces Third Quarter 2022 Private Loan Portfolio Activity HOUSTON ? October

October 14, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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) October 14, 2022 Main Street Capital Corporation (Exact name of registrant as specified in its charter) Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation) (Co

August 15, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

? ? 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) August 11, 2022 ? Main Street Capital Corporation (Exact name of registrant as specified in its charter) ? Maryland 001-33723 41-2230745 (State or other jurisdiction of incorpo

August 15, 2022 EX-1.1

Underwriting Agreement, dated August 11, 2022, among Main Street Capital Corporation and RBC Capital Markets, LLC as representative of the several underwriters named on Exhibit A thereto

? Exhibit 1.1 ? MAIN STREET CAPITAL CORP. 1,170,000 Shares of Common Stock UNDERWRITING AGREEMENT Dated: August 11, 2022 ? ? ? ? Table of Contents Page SECTION 1. Representations and Warranties?2 SECTION 2. Sale and Delivery to Underwriters; Closing?9 SECTION 3. Covenants?10 SECTION 4. Payment of Expenses?14 SECTION 5. Conditions of Underwriters? Obligations?14 SECTION 6. Indemnification?17 SECTIO

August 11, 2022 424B2

1,170,000 Shares Common Stock

Filed Pursuant to Rule 424(b)(2) ?Registration Statement No. 333-263258? PROSPECTUS SUPPLEMENT (to Prospectus dated March 3, 2022) 1,170,000 Shares Common Stock We are offering for sale 1,170,000 shares of our common stock. We are an internally managed, closed end, non-diversified management investment company that has elected to be treated as a business development company (?BDC?) under the Inves

August 11, 2022 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

EX-FILING FEES 2 main-20220811xexfilingfees.htm EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Main Street Capital Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per U

August 10, 2022 424B2

The information in this prospectus supplement is not complete and may be changed. This prospectus supplement is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any jurisdiction where the offer or sal

Filed Pursuant to Rule 424(b)(2) ?Registration Statement No. 333-263258? The information in this prospectus supplement is not complete and may be changed. This prospectus supplement is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted. Subject to Completion Preliminary Prospectus Supplement d

August 5, 2022 FWP

FWP mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 1 Investor Presentation Second Quarter – 2022 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated August 5,

FWP mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 1 Investor Presentation Second Quarter ? 2022 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated August 5, 2022 Relating to Registration Statement No. 333 - 263258 mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 2 Disclaimers Main Street

August 5, 2022 FWP

FWP mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 1 Debt Capital Markets Presentation Second Quarter – 2022 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dat

FWP mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 1 Debt Capital Markets Presentation Second Quarter ? 2022 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated August 5, 2022 Relating to R egistration Statement No. 333 - 263258 mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 2 Disclaimers

August 5, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

August 4, 2022 EX-99.1

MAIN STREET ANNOUNCES SECOND QUARTER 2022 RESULTS Second Quarter 2022 Net Investment Income of $0.75 Per Share Second Quarter 2022 Distributable Net Investment Income(1) of $0.80 Per Share Second Quarter 2022 Adjusted Distributable Net Investment Inc

? Exhibit 99.1 ? ? NEWS RELEASE ? ? ? Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 ? ? ? ? ? Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 ? ? ? ? ? ? ? ? MAIN STREET ANNOUNCES SECOND QUARTER 2022 RESULTS ? S

August 4, 2022 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Results of Operations and Financial Condition

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) August 4, 2022 ? Main Street Capital Corporation (Exact name of registrant as specified in its charter) ? Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporatio

August 4, 2022 EX-99.2

Main Street Announces Amendment of its Credit Facility Total Commitments Increased to $920 Million Maturity of the Facility Extended to August 2027

? Exhibit 99.2 ? NEWS RELEASE ? ? ? Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO & COO, [email protected] 713-350-6000 ? ? ? ? ? Dennard Lascar Investor Relations Ken Dennard / [email protected] Zach Vaughan / [email protected] 713-529-6600 ? ? ? ? ? ? ? ? Main Street Announces Amendment of its Credit Facility ?

August 4, 2022 EX-10.1

Third Amendment, dated as of August 4, 2022, to the Third Amended and Restated Credit Agreement by and among Main Street, the guarantors party thereto, Truist Bank, as administrative agent, and the lenders party thereto (previously filed as Exhibit 10.1 to Main Street Capital Corporation’s Current Report on Form 8-K filed on August 4, 2022 (File No. 1-33723))

EX-10.1 2 tmb-20220804xex10d1.htm EX-10.1 Exhibit 10.1 THIRD AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT This THIRD AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) is dated as of August 4, 2022, by and among MAIN STREET CAPITAL CORPORATION, a Maryland corporation (the “Borrower”), TRUIST BANK (the “Administrative Agent”) and the lenders party hereto (the “L

August 2, 2022 8-K

Financial Statements and Exhibits, Other Events

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) August 2, 2022 ? Main Street Capital Corporation (Exact name of registrant as specified in its charter) ? Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporatio

August 2, 2022 EX-99

Main Street Announces Fourth Quarter 2022 Regular Monthly Dividends, Including a Monthly Dividend Increase, and Supplemental Dividend Payable in September 2022 Regular Monthly Dividends of $0.22 per Share for each of October, November and December 20

EX-99 2 tmb-20220802xex99.htm EX-99.1 Exhibit 99.1 Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard | [email protected] Zach Vaughan | [email protected] 713-529-6600 NEWS RELEASE Main Street Announces Fourth Quarter 2022 Regular Mon

July 14, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

? ? 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) July 13, 2022 ? Main Street Capital Corporation (Exact name of registrant as specified in its charter) ? Maryland 001-33723 41-2230745 (State or other jurisdiction of incorpora

July 14, 2022 EX-99.2

Main Street Announces Investment Grade Rating from Fitch Ratings, Inc. Main Street Receives BBB- Rating with Stable Outlook

Exhibit 99.2 Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 ? Dennard Lascar Investor Relations Ken Dennard | [email protected] Zach Vaughan | [email protected] 713-529-6600 ? NEWS RELEASE ? ? ? ? ? ? ? ? Main Street Announces Investment Grade Rating from Fitch Ratings, Inc.

July 14, 2022 EX-99.1

Main Street Announces Second Quarter 2022 Private Loan Portfolio Activity

EX-99.1 2 main-20220713xex99d1.htm EX-99.1 Exhibit 99.1 Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, [email protected] Jesse E. Morris, CFO and COO, [email protected] 713-350-6000 Dennard Lascar Investor Relations Ken Dennard | [email protected] Zach Vaughan | [email protected] 713-529-6600 NEWS RELEASE Main Street Announces Second Quarter 2022 Privat

June 23, 2022 8-K

Regulation FD Disclosure

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) June 23, 2022 ? Main Street Capital Corporation (Exact name of registrant as specified in its charter) ? Maryland 001-33723 41-2230745 (State or other jurisdiction of incorporation

May 11, 2022 FWP

FWP mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 1 Debt Capital Markets Presentation First Quarter – 2022 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus date

FWP mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 1 Debt Capital Markets Presentation First Quarter – 2022 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated May 6, 2022 Relating to Registration Statement No. 333 - 263258 mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 2 Disclaimers Main

May 11, 2022 FWP

FWP mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 1 Investor Presentation First Quarter – 2022 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated May 6, 202

FWP mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 1 Investor Presentation First Quarter – 2022 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Filed pursuant to Rule 433 Issuer Free Writing Prospectus dated May 6, 2022 Relating to Registration Statement No. 333 - 263258 mainstcapital.com NYSE: MAIN Main Street Capital Corporation Page 2 Disclaimers Main Street Capi

May 6, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

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