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

Total Commitments Increased to $1.240 Billion

Final Maturity Date Extended to June 2031

HOUSTON – June 30, 2026 – 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 provides an increase in total commitments from $1.175 billion to $1.240

billion, while maintaining an expanded accordion feature that allows for an increase up to $1.860

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 18 lenders. The

amendment also extends both the revolving period, or reinvestment period, and the final maturity date

through June 2030 and to June 2031, 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 the Corporate Facility, 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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