Item 8.01 Other Events. On 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.