X0202 SCHEDULE 13D/A 0001104659-20-023816 0001480561 XXXXXXXX LIVE 15 Common Stock, $0.001 par value per share 07/20/2026 false 0001766037 000000000 NMF SLF I, INC.

1633 Broadway, 48th Floor New York NY 10019

Garon Meikle, Chief Financial (313) 324-5900 UAW Retiree Medical Benefits Trust 1155 Brewery Park Blvd., Suite 400 Detroit MI 48207 0001480561 N UAW Retiree Medical Benefits Trust a WC N XX 0.00 90537109.00 0.00 90537109.00 90537109.00 N 94.2 EP 0001795057 N UAW Chrysler Retirees Medical Benefits Plan a WC N XX 0.00 19185827.00 0.00 19185827.00 19185827.00 N 20 EP 0001795052 N UAW Ford Retirees Medical Benefits Plan a WC N XX 0.00 29780678.00 0.00 29780678.00 29780678.00 N 31 EP 0001795050 N UAW GM Retirees Medical Benefits Plan a WC N XX 0.00 41570604.00 0.00 41570604.00 41570604.00 N 43.3 EP 0001794997 N Hershel Harper a AF N X1 0.00 90537109.00 0.00 90537109.00 90537109.00 N 94.2 IN Common Stock, $0.001 par value per share NMF SLF I, INC. 1633 Broadway, 48th Floor New York NY 10019 On December 19, 2025, pursuant to distribution reinvestment plans (relating to distributions with record dates of September 29, 2025) (i) UAW Chrysler Retirees Medical Benefits Plan reinvested distribution proceeds in the Issuer and the Issuer issued to UAW Chrysler Retirees Medical Benefits Plan 76,990 Shares; (ii) UAW Ford Retirees Medical Benefits Plan reinvested distribution proceeds in the Issuer and the Issuer issued to UAW Ford Retirees Medical Benefits Plan 119,506 Shares; and (iii) UAW GM Retirees Medical Benefits Plan reinvested distribution proceeds in the Issuer and the Issuer issued to UAW GM Retirees Medical Benefits Plan 166,817 Shares. The price per share was $10.31. On December 31, 2025, pursuant to distribution reinvestment plans (relating to distributions with record dates of December 18, 2025) (i) UAW Chrysler Retirees Medical Benefits Plan reinvested distribution proceeds in the Issuer and the Issuer issued to UAW Chrysler Retirees Medical Benefits Plan 72,928 Shares; (ii) UAW Ford Retirees Medical Benefits Plan reinvested distribution proceeds in the Issuer and the Issuer issued to UAW Ford Retirees Medical Benefits Plan 113,201 Shares; and (iii) UAW GM Retirees Medical Benefits Plan reinvested distribution proceeds in the Issuer and the Issuer issued to UAW GM Retirees Medical Benefits Plan 158,017 Shares. The price per share was $10.26. On July 20, 2026, pursuant to distribution reinvestment plans (relating to distributions with record dates of March 31, 2026) (i) UAW Chrysler Retirees Medical Benefits Plan reinvested distribution proceeds in the Issuer and the Issuer issued to UAW Chrysler Retirees Medical Benefits Plan 68,955 Shares; (ii) UAW Ford Retirees Medical Benefits Plan reinvested distribution proceeds in the Issuer and the Issuer issued to UAW Ford Retirees Medical Benefits Plan 107,034 Shares; and (iii) UAW GM Retirees Medical Benefits Plan reinvested distribution proceeds in the Issuer and the Issuer issued to UAW GM Retirees Medical Benefits Plan 149,408 Shares. The price per share was $10.23. The aggregate number of Shares to which this Amendment No. 15 relates is 90,537,109. Such aggregate number of Shares represents 94.2% of the common stock of the Issuer. The percentage reported in this Amendment No. 15 is calculated based upon 96,085,430.828 Shares outstanding as of July 20, 2026 as indicated by the Issuer. The UAW Chrysler Retirees Medical Benefits Plan beneficially owns and has shared voting and dispositive power of 19,185,827 Shares. Such Shares represent 20.0% of the Shares outstanding. The UAW Ford Retirees Medical Benefits Plan beneficially owns and has shared voting and dispositive power of 29,780,678 Shares. Such Shares represent 31.0% of the Shares outstanding. The UAW GM Retirees Medical Benefits Plan beneficially owns and has shared voting and dispositive power of 41,570,604 Shares. Such Shares represent 43.3% of the Shares outstanding. UAW RMBT is the trust under which the Plans are established and, pursuant to Rule 13d-3, may be deemed to beneficially own the 90,537,109 Shares held by the Plans. Such Shares represent 94.2% of the Shares outstanding. UAW RMBT is an indirect beneficial owner of these Shares. Hershel Harper is the chief investment officer of UAW RMBT, the trust under which the Plans are established, and, pursuant to Rule 13d-3 may be deemed to beneficially own the 90,537,109 Shares held by the Plans. Such Shares represent 94.2% of the Shares outstanding. Hershel Harper is an indirect beneficial owner of these Shares. Except as disclosed in Item 4, no transactions in the Shares were effected during the past sixty days by the Reporting Persons. Not applicable. Not applicable. UAW Retiree Medical Benefits Trust /s/ Garon Meikle 07/22/2026 UAW Chrysler Retirees Medical Benefits Plan /s/ Garon Meikle 07/22/2026 UAW Ford Retirees Medical Benefits Plan /s/ Garon Meikle 07/22/2026 UAW GM Retirees Medical Benefits Plan /s/ Garon Meikle 07/22/2026 Hershel Harper /s/ Hershel Harper 07/22/2026