8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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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

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Main Street Capital Corporation

(Exact name of registrant as specified in its charter)

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

Not Applicable

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(Former name or former address, if changed since last report)

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

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Item 2.02    Results of Operations and Financial Condition.

On April 10, 2025, the Registrant issued a press release. A copy of such press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

The information disclosed under this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 and shall not be deemed incorporated by reference into any filing made under the Securities Act of 1933, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits.

(d) Exhibits

SIGNATURES

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

Document

Exhibit 99.1

Main Street Announces First Quarter 2025 Private Loan Portfolio Activity

HOUSTON – April 10, 2025 – Main Street Capital Corporation (NYSE: MAIN) (“Main Street”) is pleased to announce the following recent activity in its private loan portfolio. During the first quarter of 2025, Main Street originated new or increased commitments in its private loan portfolio of $130.4 million and funded total investments across its private loan portfolio with a cost basis totaling $138.2 million.

The following represent notable new private loan commitments and investments during the first quarter of 2025:

•$55.4 million in a first lien senior secured loan, $9.6 million in a first lien senior secured revolver and $1.5 million in equity to a designer and manufacturer of highly engineered electrical power distribution solutions to datacenters and other power applications;

•Increased commitment of $9.6 million in an incremental first lien senior secured loan, $2.4 million in an incremental first lien senior secured revolver and $0.4 million in incremental equity to a provider of highly technical specialty services to datacenters and various other diverse end markets;

•Increased commitment of $9.7 million in an incremental first lien senior secured loan and $1.1 million in incremental equity to a manufacturer of custom engineered die cut, formed foam, nonwoven and multi-material components for the automotive and healthcare end markets;

•Increased commitment of $10.6 million in an incremental first lien senior secured loan to a provider of tech-enabled distribution services for large blue-chip producers within the food, chemicals and materials industries;

•$8.3 million in a first lien senior secured loan, $1.2 million in a first lien senior secured revolver and $0.2 million in equity to a manufacturer of gravity flow shelving solutions for grocery, convenience and alcohol retailers; and

•$7.5 million in a first lien senior secured loan to a developer and operator of midstream gas infrastructure focused on providing gas treatment, processing and transportation services in the Delaware Basin.

As of March 31, 2025, Main Street’s private loan portfolio included total investments at cost of approximately $2.0 billion across 90 unique companies. The private loan portfolio, as a percentage of cost, included 94.7% invested in first lien debt investments and 5.3% invested in equity investments or other securities.

ABOUT MAIN STREET CAPITAL CORPORATION

Main Street (www.mainstcapital.com) is a principal investment firm that primarily provides customized long-term debt and equity capital solutions to lower middle market companies and debt capital to private companies owned by or in the process of being acquired by a private equity fund. Main Street’s portfolio investments are typically made to support management buyouts, recapitalizations, growth financings, refinancings and acquisitions of companies that operate in diverse industry sectors. Main Street seeks to partner with entrepreneurs, business owners and management teams and generally provides customized “one-stop” debt and equity financing alternatives within its lower middle market investment strategy. Main Street seeks to partner with private equity fund sponsors and primarily invests in secured debt investments in its private loan investment strategy. Main Street’s lower middle market portfolio companies generally have annual revenues between $10 million and $150 million. Main Street’s private loan portfolio companies generally have annual revenues between $25 million and $500 million.

Main Street, through its wholly owned portfolio company MSC Adviser I, LLC (“MSC Adviser”), also maintains an asset management business through which it manages investments for external parties. MSC Adviser is registered as an investment adviser under the Investment Advisers Act of 1940, as amended.