Main Street Capital CORP

Fees and Expenses

The following table is being provided to update, as of December 31, 2023, certain information in the Company’s effective shelf registration statement on Form N-2 (File No. 333-263258) filed with the SEC on March 3, 2022 as supplemented by the prospectus supplements relating to our ATM Program and to the direct stock purchase feature of the Plan. The information is intended to assist you in understanding the costs and expenses that an investor in the Company will bear directly or indirectly. We caution you that some of the percentages indicated in the table below are estimates and may vary. Except where the context suggests otherwise, whenever this Annual Report on Form 10-K contains a reference to fees or expenses paid by “you,” “us” or “Main Street,” or that “we” will pay fees or expenses, stockholders will indirectly bear such fees or expenses as investors in us.

(1)The maximum agent commission with respect to the shares of our common stock sold by us in the ATM Program is 1.00%. Purchasers of shares of common stock through the direct stock purchase feature of the Plan will not pay any sales load. In the event that our securities are sold to or through underwriters, a corresponding prospectus or prospectus supplement will disclose the applicable sales load.

(2)Estimated offering expenses payable by us for the estimated duration of the ATM Program are$0.4 million. In the event that we conduct an offering of our securities, a corresponding prospectus or prospectus supplement will disclose the estimated offering expenses.

(3)The expenses of administering the Plan are included in operating expenses. Additional costs may be charged to participants in the direct stock purchase feature of the plan for certain types of transactions.

(4)Total stockholder transaction expenses may include sales load and will be disclosed in a future prospectus or prospectus supplement, if any.

(5)Operating expenses in this table represent our estimated expenses.

(6)Interest payments on borrowed funds represent our estimated annual interest payments on borrowed funds based on current debt levels as adjusted for projected increases (but not decreases) in debt levels over the next twelve months.

(7)Income tax expense relates to the accrual of (a) deferred tax provision (benefit) primarily related to loss carryforwards, timing differences in net unrealized appreciation or depreciation and other temporary book-tax differences from our portfolio investments held in Taxable Subsidiaries and (b) excise, state and other taxes. Deferred taxes are non-cash in nature and may vary significantly from period to period. We are required to include deferred taxes in calculating our annual expenses even though deferred taxes are not currently payable or receivable. Due to the variable nature of deferred tax expense, which can be a large portion of the income tax expense, and the difficulty in providing an estimate for future periods, this income tax expense estimate is based upon the actual amount of income tax expense for the year ended December 31, 2023.

(8)Acquired fund fees and expenses represent the estimated indirect expense incurred due to investments in other investment companies and private funds.

Example

The following example demonstrates the projected dollar amount of total cumulative expenses that would be incurred over various periods with respect to a hypothetical investment in our common stock. In calculating the following expense amounts, we have assumed we would have no additional leverage and that our annual operating expenses would remain at the levels set forth in the table above and that you would pay either no sales load or a sales load of up to 1.00% (the commission to be paid by us with respect to common stock sold by us in the ATM Program).

The example and the expenses in the table above should not be considered a representation of our future expenses, and actual expenses may be greater or less than those shown. While the example assumes, as required by the SEC, a 5.0% annual return, our performance will vary and may result in a return greater or less than 5.0%. In addition, while the example assumes reinvestment of all dividends at NAV, participants in our dividend reinvestment plan will receive a number of shares of our common stock, determined by dividing the total dollar amount of the dividend payable to a participant by (i) the market price per share of our common stock at the close of trading on a valuation date determined by our Board of Directors for each dividend in the event that we use newly issued shares to satisfy the share requirements of the dividend reinvestment plan or (ii) the average purchase price of all shares of common stock purchased by the plan administrator in the event that shares are purchased in the open market to satisfy the share requirements of the dividend reinvestment plan, which may be at, above or below NAV. See the description in Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities — Dividend/Distribution Policy for additional information regarding our dividend reinvestment plan.

Insider Trading Arrangements and Policies

During the quarter ended December 31, 2023, no director or officer (as defined in Rule 16a-1(f) under the Exchange Act) of the Company adopted orterminated any Rule 10b5-1 trading arrangements or non-Rule 10b5-1 trading arrangements (in each case, as defined in Item 408(a) of Regulation S-K).