Form 8-K

8-K — New Mountain Finance Corp

Accession: 0001580642-26-003617

Filed: 2026-06-05

Period: 2026-06-05

CIK: 0001496099

Item: Other Events

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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): June

5, 2026

New Mountain Finance Corporation

(Exact name of registrant as specified in its charter)

Delaware

814-00832

27-2978010

(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

Common stock, par value $0.01 per share

NMFC

NASDAQ Global Select Market

8.250% Notes due 2028

NMFCZ

NASDAQ Global Select Market

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 8.01 Other Events.

June 5, 2026, New Mountain Finance Corporation (the “Company”) priced its private offering of (a) $40,000,000

aggregate principal amount of 7.28% Series 2026A Senior Fixed Rate Notes, Tranche A, due 2028 (the “Tranche A Notes”),

(b) $35,000,000 aggregate principal amount of 7.76% Series 2026A Senior Fixed Rate Notes, Tranche B, due 2031 (the “Tranche

B Notes”), and (c) $75,000,000 aggregate principal amount of Series 2026A Senior Floating Rate Notes, Tranche C, due 2031

(the “Tranche C Notes,” and together with the Tranche A Notes and the Tranche B Notes, the “Notes”).

The offering is expected to close on or around June 18, 2026 subject to customary closing conditions and each tranche of the Notes is

expected to be issued on or before October 1, 2026. The Company intends to use the net proceeds for general corporate purposes, including

to make investments and repay existing indebtedness.

The

Notes are being offered in reliance on Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”).

The Notes will not be registered under the Securities Act or any state securities laws and, unless so registered, may not be offered or

sold in the United States except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the

Securities Act, as applicable.

The

information on this Current Report on Form 8-K shall not constitute an offer to sell or a solicitation of an offer to purchase the Notes

or any other securities, and shall not constitute an offer, solicitation or sale in any state or jurisdiction in which such an offer,

solicitation or sale would be unlawful.

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.

New Mountain Finance Corporation

By:

/s/ Eric Kane

Name:

Eric Kane

Title:

Corporate Secretary

Date: June 5, 2026

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Entity File Number

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Entity Registrant Name

New Mountain Finance Corporation

Entity Central Index Key

0001496099

Entity Tax Identification Number

27-2978010

Entity Incorporation, State or Country Code

Entity Address, Address Line One

1633 Broadway

Entity Address, Address Line Two

48th Floor

Entity Address, City or Town

New York

Entity Address, State or Province

Entity Address, Postal Zip Code

10019

City Area Code

(212)

Local Phone Number

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Common stock, par value $0.01 per share

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Common stock, par value $0.01 per share

Trading Symbol

NMFC

Security Exchange Name

NASDAQ

8.250% Notes due 2028

Title of 12(b) Security

8.250% Notes due 2028

Trading Symbol

NMFCZ

Security Exchange Name

NASDAQ

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