New Mountain Guardian IV BDC L.L.C. 8-KEntry into a Material Definitive Agreement

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): October 7, 2024

New Mountain Guardian IV BDC, L.L.C.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code (212) 720-0300

None

(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):

Securities registered pursuant to Section 12(b) of the Act:

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

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 October 7, 2024, New Mountain Guardian IV Holdings, L.L.C. (“GIV SPV”), wholly owned subsidiary of New Mountain Guardian IV BDC, L.L.C. (the “Company”) for which the Company is the managing member, and the Company entered into an amendment (the “Amendment”) to the Loan and Security Agreement (together with the exhibits and schedules thereto, the “Loan Agreement” and the facility thereunder the “Wells Fargo Facility”) by and among GIV SPV, as borrower, the Company, as seller, as equityholder and as collateral manager, Wells Fargo Bank, National Association, as the administrative agent and swingline lender, and Western Alliance Trust Company, N.A., as the collateral custodian. Unless otherwise defined, the terms herein shall have the meaning ascribed to them in the Amendment.

Pursuant to the Amendment, the Facility Amount available under the Loan Agreement was increased to a maximum of $500,000,000. All other terms of the Loan Agreement shall remain in full force and effect.

The foregoing description of the Amendment is qualified in its entirety by reference to a copy of such agreement, which will be filed as an exhibit to the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2024.

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

d) Exhibits.

SIGNATURE

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.