X0206 3 2023-09-15 0 0001976719 New Mountain Guardian IV Income Fund, L.L.C. NONE 0001606775 Caisse de retraite d'Hydro-Quebec 75 RENE LEVESQUE BOULEVARD, WEST 5TH FLOOR MONTREAL A8 H2Z 1A4 QUEBEC, CANADA true Units of Limited Liability Company Interests 1100000 D The reporting person contracted to acquire the units of limited liability company interests that are the subject of this report as of September 15, 2023, but had no pecuniary interest in such units as of such date. The units of limited liability company interests were acquired on the date of this report. Units of limited liability company interests acquired and held as of the date of this report. /s/ Patrick Raynauld, General Manager and Chief Investment Officer 2023-09-29