Form 4 Filing for Arthur J. Gallagher & Co.

Walter D. Bay, General Counsel of Arthur J. Gallagher & Co., reported a sale of 12,000 shares of Common Stock on August 24, 2026. The shares were sold at an average weighted price of $270.081, with actual sale prices ranging from $270.01 to $270.17. Following this transaction, Mr. Bay directly owns 71,292.092 shares. Additionally, the filing details various stock options and phantom stock units held by Mr. Bay, including non-qualified stock options with exercise prices ranging from $86.17 to $337.74 and expiration dates through 2032. He also holds notional stock units and phantom stock, all with underlying values tied to Arthur J. Gallagher & Co. common stock. Mr. Bay also has indirect ownership of 491.129 shares of Common Stock through the Gallagher 401(k) plan account.