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): September 28, 2026

New Mountain Private Credit Fund

(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 ☒

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 7.01 - Regulation FD Disclosure.

September 2026 Distribution

On September 28, 2026, the Board of Trustees of New Mountain Private Credit Fund (the “Company”) declared a regular distribution in the amount of $0.19 per common share of beneficial interest (the “Shares”), payable to shareholders of record as of the open of business on September 30, 2026 to be paid on or about October 30, 2026.

This distribution will be paid in cash or reinvested in Shares for shareholders participating in the Company’s distribution reinvestment plan.

Item 8.01 - Other Events.

Net Asset Value

The net asset value (“NAV”) per Share as of August 31, 2026, as determined in accordance with the Company’s valuation policy, is $22.84.

As of August 31, 2026, the Company’s aggregate NAV was approximately $949.4 million, the fair value of its investment portfolio was approximately $1,881.1 million, and it had approximately $938.6 million of debt outstanding (at principal). The average debt-to-equity leverage ratio during August 2026 was approximately 0.97 times. As of August 31, 2026, the Company had approximately $1,510.0 million in committed debt capacity, with 100% in floating rate leverage, of which 77% was secured and 23% was unsecured, based on drawn amounts¹.

¹ Certain Notes are classified for the purposes of this filing as floating rate as a result of the Company entering into interest rate swaps to effectively swap fixed notes payments for floating rate payments.

Status of Offering

The Company is currently offering Shares on a monthly basis as part of its continuous private offering of Shares (the “Private Offering”). During the month of September, the Company did not issue any Shares in the Private Offering (excluding Shares issued through the Company’s distribution reinvestment plan). The Company intends to continue selling Shares in the Private Offering on a monthly basis.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Company has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: September 28, 2026