Item 8.01. Other Events. Extension of Stock Repurchase Program On October 28, 2024, New Mountain Finance Corporation (the “Company”) issued a press release to announce that on October 23, 2024 its board of directors approved an extension of the Company’s stock repurchase program. The press release is attached as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits. d) Exhibits. Exhibit Description Number 99.1 Press Release, dated October 28, 2024 ───────────────────────────────────────────────────────────────────────────────────────────── 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE