Exhibit 99.1

	NEWS RELEASE
	Contacts: MSC Income Fund, Inc. Dwayne L. Hyzak, CEO, dhyzak@mainstcapital.com Cory E. Gilbert, CFO, cgilbert@mainstcapital.com 713-350-6000 Dennard Lascar Investor Relations Ken Dennard / ken@dennardlascar.com Zach Vaughan / zvaughan@dennardlascar.com 713-529-6600

MSC Income Fund Announces Completion of

$150.0 Million Investment Grade Notes Offering 

HOUSTON – September 1, 2026 – MSC Income Fund, Inc. (NYSE: MSIF) (“MSC Income” or the

“Fund”) is pleased to announce the closing of a private notes offering totaling $150.0 million in

aggregate principal amount (the “Notes”). The Notes are unsecured and bear interest at a fixed rate of

6.83% per year, payable semiannually, mature on September 30, 2029 and may be redeemed in whole

or in part at any time or from time to time at MSC Income’s option at par plus accrued interest to the

prepayment date and, if applicable, a make-whole premium. The Notes will be issued in two separate

closings. The initial issuance of $75.0 million of Notes closed today, and the Fund will issue the

remaining $75.0 million of Notes in October 2026, subject to customary closing conditions.

MSC Income intends to use the net proceeds from this offering to repay the $150.0 million of

outstanding 4.04% Series A Senior Notes due 2026 on or before their maturity on October 30, 2026.

Pending such use, MSC Income intends to repay a portion of the outstanding debt borrowed under its

floating rate multi-year revolving credit facility (the “Corporate Facility”) and its special purpose

vehicle revolving credit facility (the “SPV Facility” and, together with the Corporate Facility, the

“Credit Facilities”) and then, through re-borrowing under its Credit Facilities, to fund investments in

accordance with its investment objective and strategies, to pay operating expenses and other cash

obligations and for general corporate purposes.

The Notes have not been and will not be registered under the Securities Act of 1933, as amended (the

“Securities Act”), or any state securities laws and may not be offered or sold in the United States

absent registration or an applicable exemption from the registration requirements of the Securities Act

and applicable state securities laws. This news release shall not constitute an offer to sell or a

solicitation of an offer to purchase the Notes or any other securities and shall not constitute an offer,

solicitation or sale in any state or jurisdiction in which such an offer, solicitation or sale would be

unlawful.

ABOUT MSC INCOME FUND, INC.

The Fund (www.mscincomefund.com) is a principal investment firm that primarily provides debt

capital to private companies owned by or in the process of being acquired by a private equity fund.

The Fund’s portfolio investments are typically made to support leveraged buyouts, recapitalizations,

growth financings, refinancings and acquisitions of companies that operate in diverse industry sectors.

The Fund seeks to partner with private equity fund sponsors and primarily invests in secured debt

investments within its private loan investment strategy. The Fund also maintains a portfolio of

customized long-term debt and equity investments in lower middle market companies, and through

those investments, the Fund has partnered with entrepreneurs, business owners and management teams

in co-investments with Main Street Capital Corporation (NYSE: MAIN) (“Main Street”) utilizing the

customized “one-stop” debt and equity financing solutions provided in Main Street’s lower middle

market investment strategy. The Fund’s private loan portfolio companies generally have annual

revenues between $25 million and $500 million. The Fund’s lower middle market portfolio companies

generally have annual revenues between $10 million and $150 million.

ABOUT MSC ADVISER I, LLC

MSC Adviser I, LLC (“MSCA”) is a wholly-owned subsidiary of Main Street that is registered as an

investment adviser under the Investment Advisers Act of 1940, as amended. MSCA serves as the

investment adviser and administrator of the Fund in addition to several other advisory clients.

FORWARD-LOOKING STATEMENTS

This news release may contain certain forward-looking statements, including but not limited to the

availability of future financing capacity under the Fund’s Credit Facilities. 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 the Fund’s control, and that the

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

assurances of any aspect of future performance. Actual performance 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 the Fund’s filings with the U.S. Securities and Exchange Commission.

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

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

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