UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to ~~section~~ Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported): ~~December 15~~January 13, ~~2025~~ 2026

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

(Exact name of registrant as specified in its charter)

Delaware

814-01528

88-1377220

(State or other jurisdiction of

incorporation or organization)

(Commission

File Number)

(IRS Employer

Identification Number)

1633 Broadway, 48th Floor,
New York, New York	10019
(Address of principal executive offices)	(Zip Code)

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):

☐¨ 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))

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

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
N/A		N/A		N/A

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 ☒ ⮽

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. ☐

Item 31.0201. ~~Unregistered~~Entry ~~Sale~~into ofa ~~Equity~~Material ~~Securities~~Definitive Agreement.

On ~~December~~January 1513, ~~2025~~2026, New Mountain Guardian IV Holdings, L.L.C. (“GIV Holdings”), wholly owned subsidiary of New Mountain Guardian IV BDC, L.L.C. (the “Company”) ~~delivered~~for awhich ~~capital~~the ~~drawdown~~Company ~~notice~~is tothe ~~its~~managing ~~investors~~member, ~~relating~~and the Company entered into an Amendment No. 3 (“Amendment No. 3”) to Loan and Security Agreement (together with the ~~sale~~exhibits ~~of 12~~and schedules thereto,~~078,960~~ ofthe “Loan Agreement” and the ~~Company’s~~facility ~~units~~thereunder (the “~~Units~~Wells Fargo Facility”) ~~for~~by anand ~~aggregate~~among GIV ~~offering~~Holdings, ~~price~~as ofborrower, ~~$120~~the Company,~~789~~ as seller,~~600,~~ atas ~~a price~~equityholder ~~per~~and ~~Unit~~as ~~equal~~collateral tomanager, ~~$10.00.~~Wells NoFargo ~~underwriting~~Bank, ~~discounts~~National orAssociation, as ~~commissions~~the ~~have~~administrative ~~been~~agent, ora ~~will~~lender, beand ~~paid~~swingline inlender, ~~connection~~and ~~with~~Western ~~the~~Alliance ~~sale~~Trust ofCompany, ~~the Units~~N.A., ~~The~~as ~~sale~~the ofcollateral custodian. Unless otherwise defined, the ~~Units~~terms isherein ~~expected~~shall have the meaning ascribed to ~~close~~them onin ~~December~~Amendment ~~30,~~No. ~~2025~~3.

~~The~~Amendment ~~sale~~No. of3 amended the ~~Units~~Loan ~~described~~Agreement ~~herein~~to, ~~was~~among ~~and will~~other bethings, ~~made~~(i) ~~pursuant~~extend the toRevolving ~~subscription~~Period ~~agreements~~End ~~entered~~Date ~~into~~from byMarch ~~the~~2028 ~~Company~~to ~~and~~November ~~its~~2028; ~~investors.~~and ~~Under~~(ii) ~~the~~extend ~~terms of~~ the ~~subscription~~Facility ~~agreements, investors~~Maturity ~~are~~Date ~~required~~from toMarch ~~fund~~2030 ~~drawdowns~~ to ~~purchase~~November 2030. ~~the~~All ~~Units~~other upterms toof the ~~amount~~Loan ofAgreement ~~its~~shall ~~capital~~remain ~~commitment~~in onfull anforce ~~as-needed~~and ~~basis with a minimum of 10 business days’ prior notice to investors~~effect.

The ~~offer~~foregoing ~~and~~description ~~sale~~ of ~~the Units~~Amendment ~~was~~No. ~~exempt~~3 ~~from~~is ~~the~~qualified ~~registration~~in ~~requirements~~its ofentirety by ~~the~~reference ~~Securities~~to ~~Act~~a copy of ~~1933~~Amendment No. 3, which will be filed as ~~amended,~~an ~~pursuant~~exhibit to ~~Section~~the ~~4(a)(2)~~Company’s ~~thereof~~Annual ~~and~~Report on Form 10-K for ~~Regulation~~the Dfiscal ~~thereunder~~year ended December 31, 2025.

Item 92.0103. Creation of a Direct Financial ~~Statements~~Obligation ~~and~~or ~~Exhibits~~an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

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

Item 5.02.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On January 15, 2026, Alfred F. Hurley, Jr. notified the Board of Directors of the Company (the “Board”) of his decision to retire from his position as a director of the Company. Mr. Hurley has served as a member of the Board since 2022. Mr. Hurley’s retirement is not the result of any disagreement with the Company.

In order to fill the vacancy created by Mr. Hurley’s retirement, the Board appointed Daniel B. Hébert as a Director of the Company, effective as of January 15, 2026. In connection with his appointment, Mr. Hébert will also serve as a member of the Audit Committee, Nominating and Corporate Governance Committee, and Valuation Committee of the Board. Mr. Hébert, age 69, currently serves as Chief Executive Officer of 777 Securities, LLC, a registered broker-dealer, since September 2018. He was Co-Founder, Chief Operating Officer and Chief Compliance Officer of Vision One Management Partners, LP, a registered investment advisor, from 2022 to 2024. He served as Chief Executive Officer of Bernstein Hébert Securities, a registered broker-dealer, from September 2018 to June 2020, and as Chief Operating Officer of Bernstein Equity Partners, LLC, a family office and investment banking boutique, from May 2017 to June 2020. Mr. Hébert has also served as a director of New Mountain Private Credit Fund since 2024 and has served as a Class III Director of New Mountain Finance Corporation since 2019.

There is no arrangement or understanding between Mr. Hébert and any other persons pursuant to which Mr. Hébert was selected as a director. There are no family relationships between Mr. Hébert and any director, executive officer or person nominated or chosen by the Company to become a director or executive officer of the Company within the meaning of Item 401(d) of Regulation S-K under the Securities Act of 1933, as amended (“Regulation S-K”). Mr. Hébert is not a party to any transaction, or any proposed transaction, required to be disclosed pursuant to Item 404(a) of Regulation S-K.

Item 9.01.

Financial Statements and Exhibits

(d) Exhibits.

	Exhibit No.		Description
	104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, ~~as amended,~~ the ~~Registrant~~registrant has duly caused this ~~Current~~report ~~Report on Form 8-K~~ to be signed on its behalf by the undersigned ~~hereunto~~ hereunto duly authorized.

	NEW MOUNTAIN Guardian IV BDC, L.L.C.
Date: December 17, 2025	By:	/s/ Eric Kane
		Name:	Eric Kane
		Title:	Corporate Secretary

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

By:	/s/ Eric Kane
Name:	Eric Kane
Title:	Corporate Secretary

2Date: January 16, 2026

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