Form 4 Filing for GCM Grosvenor Inc.

This Form 4 filing details transactions by Kathleen Patricia Sullivan, Principal Accounting Officer of GCM Grosvenor Inc. On April 15, 2026, Ms. Sullivan acquired 7,976 shares of Class A Common Stock through the net settlement of vested Restricted Stock Units (RSUs). These RSUs were granted on January 15, 2026, and vested in full on April 15, 2026. The RSUs were settled in Class A Common Stock, with 7,976 shares issued. Concurrently, 9,474 shares of Class A Common Stock were withheld by the issuer to cover tax withholding obligations amounting to $10.88 per share. Following these transactions, Ms. Sullivan holds 68,506 shares of Class A Common Stock directly. The withholding of shares for tax purposes does not represent an open-market sale.