Form 4 Filing for Richard C. Cary

This filing details transactions made by Richard C. Cary, Controller and CAO of Arthur J. Gallagher & Co. On September 15, 2026, Cary disposed of 1000 shares of Common Stock at a price of $252.8583 per share, resulting in 46819.487 shares remaining. The filing also discloses holdings in various derivative instruments, including non-qualified stock options with exercise prices ranging from $86.17 to $177.09 and expiration dates between 2027 and 2030. Additionally, Cary holds 1018.466 notional stock units and 160.685 phantom shares of Common Stock, with specific vesting and payment conditions outlined in the footnotes. The filing also reports indirect ownership of 418.699 shares of Common Stock through the Gallagher 401(k) plan account.