MSC INCOME FUND, INC.

Rule 10b5-1 Trading Plans

During the fiscal quarter ended September 30, 2026, none of MSC Income’s directors or officers adopted orterminated any contract, instruction or written plans for the purchase or sale of the Fund’s securities to satisfy the affirmative defense conditions of Exchange Act Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement.”

Officer Appointment

On November 4, 2026, in connection with the previously announced Chief Executive Officer (“CEO”) succession plan, MSC Income’s Board of Directors appointed Nicholas T. Meserve to serve as MSC Income’s CEO effective as of November 9, 2026. Mr. Meserve currently serves as a Managing Director of MSC Income and group head of its private credit investment team and succeeds Dwayne L. Hyzak in the new role. Mr. Hyzak, who has served as MSC Income’s Chairman and CEO since October 2020, will continue to serve as Executive Chairman of MSC Income’s Board of Directors.

Reference is made to the biographical information with respect to Mr. Meserve set forth under the heading “Officers” in MSC Income’s 2026 proxy statement for its 2026 Annual Meeting of Stockholders filed with the Securities and Exchange Commission on May 20, 2026, which information is incorporated herein by reference.

There is no arrangement or understanding between Mr. Meserve and any other persons pursuant to which he is being designated as the Fund’s CEO. There are no family relationships between Mr. Meserve and any director, director nominee or executive officer of the Fund, and there are no current or proposed transactions between the Fund and Mr. Meserve or his immediate family members that would require disclosure under Item 404(a) of Regulation S-K.

MSC Income does not and will not pay direct compensation to Mr. Meserve; his compensation is paid by the Adviser and Main Street. No new compensatory arrangement has been entered into in connection with Mr. Meserve’s designation as CEO.