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: May 6, 2014

(Date of earliest event reported)

Garrison Capital Inc.

(Exact name of registrant as specified in its charter)

212-372-9590

(Registrant’s telephone number, including area code)

Not Applicable

(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:

 ¨ 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 5.07. Submission of Matters to a Vote of Security Holders.

On May 6, 2014, the Company held its annual meeting of stockholders, or Annual Meeting. At the Annual Meeting, the Company’s stockholders approved two proposals. The issued and outstanding shares of stock of the Company entitled to vote at the Annual Meeting consisted of 16,758,779 shares of common stock outstanding on the record date, March 13, 2014. The final voting results from the Annual Meeting were as follows:

Proposal 1. To elect two Class II directors of the Company who will each serve for a term of three years or until his successor is duly elected and qualifies.

Proposal 2. To ratify the selection of McGladrey LLP to serve as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2014.

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.