SCHEDULE 13G/A 0001509764 XXXXXXXX LIVE 4 Class A Common Stock, par value $0.0001 12/31/2025 0001819796 GCM Grosvenor Inc. 36831E108 900 North Michigan Avenue, Suite 1100, Chicago IL 60611 Rule 13d-1(d) Michael Jay Sacks X1 0.00 141672819.00 0.00 141672819.00 141672819.00 N 70.0 IN Grosvenor Holdings, L.L.C. IL 0.00 133965014.00 0.00 133965014.00 0.00 N 68.8 OO (Limited Liability Company) Grosvenor Holdings II, L.L.C. DE 0.00 3226977.00 0.00 3226977.00 3226977.00 N 5.0 OO (Limited Liability Company) GCM Grosvenor Management, LLC DE 0.00 4480828.00 0.00 4480828.00 4480828.00 N 6.9 OO (Limited Liability Company) GCM Progress LLC DE 0.00 90155396.00 0.00 90155396.00 90155396.00 N 59.8 OO (Limited Liability Company) GCM Progress Subsidiary LLC DE 90155396.00 0.00 90155396.00 0.00 90155396.00 N 59.8 OO (Limited Liability Company) GCM Grosvenor Inc. 900 North Michigan Avenue, Suite 1100, Chicago, IL 60611. Each of the following is hereinafter individually referred to as a "Reporting Person" and collectively as the "Reporting Persons." This statement is filed on behalf of: Michael Jay Sacks Grosvenor Holdings, L.L.C. Grosvenor Holdings II, L.L.C. GCM Grosvenor Management, LLC GCM Progress LLC GCM Progress Subsidiary LLC The principal business address of the Reporting Persons is c/o GCM Grosvenor Inc., 900 North Michigan Avenue, Suite 1100, Chicago, IL 60611. Grosvenor Holdings, L.L.C. is organized under the laws of the state of Illinois. Grosvenor Holdings II, L.L.C., GCM Grosvenor Management, LLC, GCM Progress LLC and GCM Progress Subsidiary LLC are each organized under the laws of the state of Delaware. Michael Jay Sacks is a citizen of the United States. Y The ownership information presented below represents beneficial ownership of the shares Class A Common Stock as of December 31, 2025, based upon 60,721,681 shares of Class A Common Stock outstanding as of December 31, 2025. The ownership information assumes the redemption of the common units of Grosvenor Capital Management Holdings, LLLP ("Common Units") held by the Reporting Persons for shares of the Issuer's Class A Common Stock on a one-to-one basis. Michael Jay Sacks 141,672,819 Grosvenor Holdings, L.L.C. 133,965,014 Grosvenor Holdings II, L.L.C. 3,226,977 GCM Grosvenor Management, LLC 4,480,828 GCM Progress LLC 90,155,396 GCM Progress Subsidiary LLC 90,155,396 Michael Jay Sacks 70.0% Grosvenor Holdings, L.L.C. 68.8% Grosvenor Holdings II, L.L.C. 5.0% GCM Grosvenor Management, LLC 6.9% GCM Progress LLC 59.8% GCM Progress Subsidiary LLC 59.8% Michael Jay Sacks 0 Grosvenor Holdings, L.L.C. 0 Grosvenor Holdings II, L.L.C. 0 GCM Grosvenor Management, LLC 0 GCM Progress LLC 0 GCM Progress Subsidiary LLC 0 Michael Jay Sacks 141,672,819 Grosvenor Holdings, L.L.C. 133,965,014 Grosvenor Holdings II, L.L.C. 3,226,977 GCM Grosvenor Management, LLC 4,480,828 GCM Progress LLC 90,155,396 GCM Progress Subsidiary LLC 90,155,396 Michael Jay Sacks 0 Grosvenor Holdings, L.L.C. 0 Grosvenor Holdings II, L.L.C. 0 GCM Grosvenor Management, LLC 0 GCM Progress LLC 0 GCM Progress Subsidiary LLC 0 Michael Jay Sacks 141,672,819 Grosvenor Holdings, L.L.C. 133,965,014 Grosvenor Holdings II, L.L.C. 3,226,977 GCM Grosvenor Management, LLC 4,480,828 GCM Progress LLC 90,155,396 GCM Progress Subsidiary LLC 90,155,396 Grosvenor Holdings II, L.L.C. is the record holder of 3,226,977 Common Units. GCM Grosvenor Management, LLC is the record holder of 4,480,828 Common Units. Grosvenor Holdings, L.L.C. is the record holder of 43,802,630 Common Units and 6,988 shares of Class A Common Stock. GCM Progress Subsidiary LLC is the record holder of 90,155,396 Common Units. The Common Units may be redeemed by the Reporting Persons at any time for shares of the Issuer's Class A Common Stock on a one-to-one basis. Mr. Sacks is the ultimate managing member of each of Grosvenor Holdings, L.L.C., Grosvenor Holdings II, L.L.C. and GCM Grosvenor Management, LLC. Grosvenor Holdings, L.L.C. is the sole member of GCM Progress LLC, which is the sole member of GCM Progress Subsidiary LLC. As a result, Mr. Sacks may be deemed to share beneficial ownership of the securities held by the Reporting Persons. Y Y Y Y Y Exhibit No. Description 99 Joint Filing Agreement (previously filed). Michael Jay Sacks /s/ Michael Jay Sacks 02/13/2026 Grosvenor Holdings, L.L.C. /s/ Michael Jay Sacks 02/13/2026 Grosvenor Holdings II, L.L.C. /s/ Michael Jay Sacks 02/13/2026 GCM Grosvenor Management, LLC /s/ Michael Jay Sacks 02/13/2026 GCM Progress LLC /s/ Michael Jay Sacks 02/13/2026 GCM Progress Subsidiary LLC /s/ Michael Jay Sacks 02/13/2026