X0609 4 2026-09-15 0 0001819796 GCM Grosvenor Inc. GCMG 0001610089 Bentley Pamela L false C/O GCM GROSVENOR INC. 900 NORTH MICHIGAN AVENUE, SUITE 1100 CHICAGO IL 60611 0 1 0 0 Chief Financial Officer 1 Class A Common Stock 2026-09-15 4 S 0 40000 12.5627 D 24397 D Class A Common Stock 2026-09-16 4 S 0 10000 12.6787 D 14397 D These shares were sold pursuant to a Rule 10b5-1 trading plan in multiple transactions at prices ranging from $12.3800 to $12.7300, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold pursuant to a Rule 10b5-1 trading plan in multiple transactions at prices ranging from $12.4550 to $12.7800, inclusive. The price reported in Column 4 is a weighted average price. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (2) to this Form 4. /s/ Burke Montgomery, Attorney-in-Fact 2026-09-16