Invests $39.3 Million in Recapitalization of Midstream Valve Partners, LLC

HOUSTON, Aug. 18, 2026 /PRNewswire/ -- Main Street Capital Corporation (NYSE:MAIN) ("Main Street") is pleased to announce that it recently completed a new portfolio investment totaling $39.3 million to facilitate the minority recapitalization of Midstream Valve Partners, LLC ("MVP" or the "Company"), a leading value-added distributor of valves, actuators and related flow-control accessories for the energy infrastructure and refining industries. Main Street partnered with MVP's founder to facilitate the transaction, with Main Street's investment in the Company including a combination of first lien, senior secured term debt and a direct minority equity investment.

Founded in 2019 and headquartered in Tomball, Texas, MVP is a leading value-added distributor of valve, actuator and related flow-control accessory solutions to midstream pipeline operators, engineering, procurement & construction firms, fabricators and other distributors that serve the energy infrastructure, pipeline and refining industries primarily in the continental United States.

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.

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

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SOURCE Main Street Capital Corporation