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): March 27, 2014

NF Investment Corp.

(Exact name of registrant as specified in charter)

(212) 813-4900

(Registrant’s telephone number, including area code)

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):

Item 1.01. Entry into a Material Definitive Agreement

On March 27, 2014, NF Investment Corp. (the “Company”) entered into a Senior Secured Revolving Credit Agreement (the “Facility”). The parties to the Facility include the Company, as Borrower, the lenders from time to time as parties thereto (each a “Lender” and collectively, the “Lenders”) and KeyBank National Association as Administrative Agent.

The maximum principal amount of the Facility is $50,000,000, subject to availability under the borrowing base, which is based on the value of the Company’s portfolio investments net of certain other indebtedness that the Company may incur in the future in accordance with the terms of the Facility. Proceeds of the Facility may be used for general corporate purposes, including the funding of portfolio investments. Maximum capacity under the Facility may be increased to $75,000,000 through the exercise by the Company of an uncommitted accordion feature through which existing and new lenders may, at their option, agree to provide additional financing. The Facility includes a $10,000,000 limit for swingline loans and a $5,000,000 limit for letters of credit.

Subject to certain exceptions, including, without limitation, the Company’s ownership interests in its special purpose non-guarantor subsidiaries, the Facility is secured by a perfected first-priority security interest in substantially all of the portfolio investments held by the Company and certain future domestic subsidiaries of the Company (collectively, the “Guarantors”). The Company is required to cause the Guarantors to guaranty the Facility.

The availability period under the Facility will terminate on March 27, 2017 or earlier under certain conditions specified in the Facility (the “Commitment Termination Date”) and the Facility will mature on March 27, 2020 (the “Maturity Date”). During the period from the Commitment Termination Date to the Maturity Date, the Company will be obligated to make mandatory prepayments under the Facility out of the proceeds of certain asset sales, other recovery events and equity and debt issuances.

The Company may borrow amounts in U.S. dollars, subject to the satisfaction of certain conditions, including certain collateral quality tests. Amounts drawn under the Facility, including amounts drawn in respect of letters of credit, will bear interest at either (a) LIBOR plus an applicable spread of (i) prior to the Commitment Termination Date, 2.25% and (ii) following the Commitment Termination Date, 2.65%, or (b) an “alternative base rate” (which is the highest of a prime rate, the federal funds effective rate plus 0.50%, or one month LIBOR plus 1.00%) plus an applicable spread of (i) prior to the Commitment Termination Date, 1.25% and (ii) following the Commitment Termination Date, 1.65%. The Company may elect either the LIBOR or the “alternative base rate” at the time of drawdown, and loans may be converted from one rate to another at any time, subject to certain conditions. The Company will also pay a fee of 0.375% on undrawn amounts under the Facility and, in respect of each undrawn letter of credit, a fee and interest rate equal to the then-applicable margin under the Facility while the letter of credit is outstanding.

The Facility includes customary covenants, including certain financial covenants related to asset coverage, shareholders’ equity, liquidity and interest coverage, certain limitations on the incurrence of additional indebtedness and liens, and other maintenance covenants, as well as usual and customary events of default for senior secured revolving credit facilities of this nature.

Item 2.03. Creation of Direct Financial Obligation

The information included under Item 1.01 above is incorporated by reference into this Item 2.03.

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.

Date: April 2, 2014