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): April ~~March 19~~22, 2026

New Mountain Guardian IV Income Fund, L.L.C.

(Exact name of registrant as specified in its charter)

Delaware

~~814-01639~~

~~92-0964074~~

814-01639

92-0964074

(State or other jurisdiction of incorporation or organization)

(Commission File Number)

(IRS Employer Identification Number)

(State or other jurisdiction ofincorporation or organization)

(CommissionFile Number)

(IRS EmployerIdentification Number)

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

1633 Broadway, 48th Floor, New York, NY 10019

~~Registrant’s~~(Address ~~telephone~~of ~~number,~~principal ~~including area~~executive ~~code: (212~~offices)(zip ~~720-0300~~code)

~~None~~Registrant’s telephone number, including area code (212) 720-0300

(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~~None 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. ☐

1Item 7.01 - Regulation FD Disclosure.

~~Item~~In 5connection with its disclosure obligations under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and the rules promulgated thereunder, New Mountain Guardian IV Income Fund, L.02L.C. ~~Departure~~(the “Company”) discloses its schedule of ~~Directors~~investments oron ~~Certain~~a ~~Officers;~~quarterly ~~Election~~basis. ofIn ~~Directors;~~connection ~~Appointment~~with ofsuch ~~Certain~~disclosure, ~~Officers;~~the ~~Compensatory~~Company ~~Arrangements~~classifies ofits ~~Certain~~portfolio ~~Officers~~investments into 11 different industry types for quarterly reporting on Form 10-Q and annual reporting on Form 10-K.

OnAs ~~March 19,~~part ~~2026, the Board~~ of ~~Directors~~our ofinternal ~~New Mountain Guardian IV Income Fund~~monitoring, ~~L.L.C.~~each ~~(the~~portfolio ~~“Company”)~~company ~~received~~is ~~and~~also ~~accepted~~assigned ~~the resignation~~a ofsub-classification ~~Kris~~within ~~Corbett as Chief Financial Officer and Treasurer of~~ the ~~Company.~~disclosed ~~Mr.~~industry ~~Corbett’s~~type ~~resignation~~to ~~will~~better ~~become~~reflect ~~effective upon~~ the ~~completion~~business ofmix ~~a prudent transition~~ of the ~~role~~underlying toportfolio ~~a successor Chief Financial Officer and Treasurer, which is expected to occur by May 29, 2026 (the “Effective Date”)~~companies. ~~Mr.~~These ~~Corbett~~sub-classifications ~~will continue to serve~~ as ~~the Chief Financial Officer and Treasurer~~ of ~~the~~December ~~Company until the Effective Date. In submitting his resignation~~31, ~~Mr. Corbett~~2025 ~~did not express any disagreement on any matter relating to the Company’s operations, policies or practices.~~were:


	December 31, 2025
Industry Type	Percent of Total Investments at Fair Value
Business Services
Insurance & Benefits Services	9.5	%
Data & Information Services	6.3	%
Utility & Data Center Services	4.8	%
Real Estate Services	3.2	%
Digital Transformation	2.9	%
Compliance Services	2.1	%
Misc Services	1.9	%
Engineering & Consulting Services	1.7	%
Field Services	1.7	%
Business Services Subtotal	34.1	%
Software
Enterprise Resource Planning	8.4	%
Finance & Accounting	5.4	%
IT Infrastructure & Security	5.0	%
Human Capital Management	4.4	%
Commerce & Supply Chain	3.9	%
Governance, Risk & Compliance	3.4	%
Software Subtotal	30.5	%
Financial Services & Technology
Financial Services	8.1	%
Financial Technology	3.6	%
Integrated Payments	3.1	%
Financial Services & Technology Subtotal	14.8	%
Healthcare
Healthcare IT & Tech-Enabled Services	5.2	%
Healthcare Products	3.1	%
Pharma Services	1.4	%
Healthcare Services	0.6	%
Healthcare Subtotal	10.3	%
Consumer Services	4.5	%
Education	3.3	%
Business Products	0.9	%
Food & Beverage	0.7	%
Packaging	0.6	%
Distribution & Logistics	0.2	%


Investment Fund	0.1	%
Total	100.0	%

The information set forth under this Item 7.01 is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.


Item 9.01.			Financial Statements and Exhibits.

d) Exhibits.



Exhibit Number						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 ~~report~~Current Report on Form 8-K to be signed on its behalf by the undersigned hereunto duly authorized.

New Mountain Guardian IV Income Fund, L.L.C. By: /s/ Eric Kane Name: Eric Kane Title: Corporate Secretary

New Mountain Guardian IV Income Fund, L.L.C.

Date: April 22, 2026

By:

/s/ Eric Kane

Name:

Eric Kane

Title:

Corporate Secretary

Date: March 24, 2026

Filing Compare · New Mountain Guardian IV Income Fund, L.L.C.