New Mountain Finance Corp

To the shareholders and the Board of Directors of New Mountain Finance Corporation

Results of Review of Interim Financial Information

We have reviewed the accompanying consolidated statement of assets and liabilities of New Mountain Finance Corporation and subsidiaries (the "Company"), including the consolidated schedule of investments, as of June 30, 2026, the related consolidated statements of operations and changes in net assets for the three-month and six-month periods ended June 30, 2026 and 2025, the consolidated statements of cash flows and financial highlights for the six-month periods ended June 30, 2026 and 2025, and the related notes (collectively referred to as the "interim financial information"). Based on our review, we are not aware of any material modifications that should be made to the accompanying interim financial information for it to be in conformity with accounting principles generally accepted in the United States of America.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated statement of assets and liabilities of the Company, including the consolidated schedule of investments as of December 31, 2025, and the related consolidated statements of operations, changes in net assets, cash flows, and financial highlights for the year then ended (not presented herein); and in our report dated February 24, 2026, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying consolidated statement of assets and liabilities as of December 31, 2025, is fairly stated, in all material respects, in relation to the consolidated statement of assets and liabilities from which it has been derived.

Basis for Review Results

This interim financial information is the responsibility of the Company's management. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our review in accordance with standards of the PCAOB. A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the PCAOB, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

/s/ DELOITTE & TOUCHE LLP

New York, New York

August 3, 2026