Main Street Capital CORP

For the period ended Mar 31, 2026. Filed May 8, 2026.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Mar 31, 2026 · Filed May 8, 2026

MAIN$57.13+0.2%Stored close · as of Nov 9, 2026

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Contents

Item 6. Exhibits

Listed below are the exhibits which are filed as part of this report (according to the number assigned to them in Item 601 of Regulation S-K):

Exhibit Number	Description
10.1*	Eighth Amendment to Third Amended and Restated Credit Agreement, dated as of March 12, 2026, by and among Main Street Capital Corporation, the guarantors party thereto, Truist Bank, as administrative agent, and the lenders party thereto.
10.2*	Master Note Purchase Agreement, dated as of April 8, 2026, by and among Main Street Capital Corporation and the purchasers party thereto.
31.1*	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934.
31.2*	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934.
32.1**	Certification of Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. 1350).
32.2**	Certification of Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. 1350).
101*	The following financial information from our Quarterly Report on Form 10-Q for the first quarter of fiscal year 2026, filed with the SEC on May 8, 2026, formatted in Inline Extensible Business Reporting Language (iXBRL): (i) the Consolidated Balance Sheets as of March 31, 2026 and December 31, 2025, (ii) the Consolidated Statements of Operations for the three months ended March 31, 2026 and 2025, (iii) the Consolidated Statements of Changes in Net Assets for the three months ended March 31, 2026 and 2025, (iv) the Consolidated Statements of Cash Flows for the three months ended March 31, 2026 and 2025, (v) the Consolidated Schedule of Investments for the periods ended March 31, 2026 and December 31, 2025, (vi) the Notes to Consolidated Financial Statements and (vii) the Consolidated Schedule 12-14 for the three months ended March 31, 2026 and 2025.
104*	Cover Page Interactive Data File (embedded within the Inline XBRL document)

Filed herewith

** Furnished herewith

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.