UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 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):

July 19, 2018

CAPITALA FINANCE CORP.

(Exact name of registrant as specified in its charter)

4201 Congress St., Suite 360

Charlotte, NC 28209

(Address of principal executive offices and zip code)

Registrant’s telephone number, including area code: (704) 376-5502

Check the appropriate box below if the Form 8-K is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨   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))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

Emerging growth company x

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

On July 19, 2018, Capitala Finance Corp. (the “Company”) entered into Amendment No. 3 (the “Amendment”) to its Senior Secured Revolving Credit Agreement with ING Capital LLC, as administrative agent, arranger and bookrunner, and the lenders party thereto (the “Credit Facility”).

The Amendment amended the Credit Facility to, among other things, reduce the minimum required Consolidated Interest Coverage Ratio (as defined in the Credit Facility) that the Company must maintain on a quarterly basis from 2.25 to 1 as of the last day of any fiscal quarter of the Company, as was previously in effect, to (i) 1.75 to 1 as of the last day of any fiscal quarter of the Company ending after March 31, 2018 but on or prior to December 31, 2018, and (ii) 2.00 to 1 as of the last day of any fiscal quarter of the Company ending after December 31, 2018.

The description above is only a summary of the material provisions of the Amendment to the Credit Facility and is qualified in its entirety by reference to the copy of Amendment No. 3 to the Senior Secured Revolving Credit Agreement, which is filed as Exhibit 10.1 to this current report on Form 8-K and is incorporated herein by reference thereto.

The disclosure set forth above under Item 1.01 is incorporated by reference herein.

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.