UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT Pursuant

to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported) May 18, 2015 (May 18, 2015)

Monroe Capital Corporation

(Exact name of registrant as specified in its charter)

Maryland

(State or other jurisdiction of incorporation)

(312) 258-8300

(Registrant’s telephone number, including area code)

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

ITEM 8.01. Other Events.

On May 18, 2015, Monroe Capital Corporation (the “Company”) completed the sale of an additional 367,500 shares of its common stock, par value $0.001 per share (the “Over-allotment Shares”), at a price of $14.85 per share, pursuant to the exercise by Robert W. Baird & Co. Incorporated, William Blair & Company, L.L.C., Janney Montgomery Scott LLC and Oppenheimer & Co. Inc., as representatives of the several underwriters (the “Underwriters”), of the over-allotment option provided in connection with its recently completed public offering in the Underwriting Agreement entered into by and between the Company and the Underwriters on April 15, 2015. The Company raised an additional $5,236,875 in proceeds, net of underwriting discounts and commissions and before expenses, as a result of the sale of the Over-allotment Shares.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: May 18, 2015