Main Street Capital Corporation

Item 2.02 Results of Operations and Financial Condition. On July 16, 2026, the Registrant issued a press release announcing certain preliminary estimates of its financial condition and results of operations for its fiscal quarter ended June 30, 2026, as well as other information. A copy of such press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information disclosed herein, including Exhibit 99.1 hereto, shall be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and shall be deemed incorporated by reference into the Registrant’s filings made under the Securities Act of 1933, as amended; provided, however, that information contained on the Registrant’s website referred to in the press release attached hereto as Exhibit 99.1 is not incorporated by reference herein or in Exhibit 99.1 and is not a part of this Form 8-K or Exhibit 99.1.