Exhibit 99.1

	NEWS RELEASE
	Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, dhyzak@mainstcapital.com Ryan R Nelson, CFO, rnelson@mainstcapital.com 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / ken@dennardlascar.com Zach Vaughan / zvaughan@dennardlascar.com 713-529-6600

Main Street Announces Amendment of its Corporate Credit Facility

Interest Rate Decreased

Total Commitments Increased to $1.145 Billion

Final Maturity Date Extended to April 2030

HOUSTON – May 1, 2025 – Main Street Capital Corporation (NYSE: MAIN) (“Main Street”) is

pleased to announce the amendment of its revolving credit facility (the “Corporate Facility”). The

recently closed amendment decreases the interest rate to the applicable Secured Overnight Financing

Rate (“SOFR”) plus a credit spread adjustment of 0.10% plus (a) 1.775% prior to satisfying certain

step-down conditions or (b) 1.65% after satisfying certain step-down conditions. The amendment also

provides an increase in total commitments from $1.110 billion to $1.145 billion, while maintaining an

expanded accordion feature that allows for an increase up to $1.718 billion of total commitments from

new and existing lenders on the same terms and conditions as the existing commitments and

maintaining the benefits of a diversified group of 19 lenders. The amendment also extends both the

revolving period, or reinvestment period, and the final maturity date through April 2029 and to April

2030, respectively. In addition, Main Street continues to maintain options under the amended

Corporate Facility which could extend each of the revolving period and the final maturity of the

Corporate Facility for up to two additional years, subject to certain conditions, including lender

approval.

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 solutions 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.

FORWARD-LOOKING STATEMENTS

This press release contains certain forward-looking statements, including but not limited to the

availability of future financing capacity under its credit facilities, which are based upon Main Street

management’s current expectations and are inherently uncertain. Any such statements other than

statements of historical fact are likely to be affected by other unknowable future events and conditions,

including elements of the future that are or are not under Main Street’s control, and that Main Street

may or may not have considered; accordingly, such statements cannot be guarantees or assurances of

any aspect of future performance. Actual performance, events and results could vary materially from

these estimates and projections of the future as a result of a number of factors, including those

described from time to time in Main Street’s filings with the Securities and Exchange Commission.

Such statements speak only as of the time when made and are based on information available to Main

Street as of the date hereof and are qualified in their entirety by this cautionary statement. Main Street

assumes no obligation to revise or update any such statement now or in the future.

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