Form 4 Filing for Arthur J. Gallagher & Co.

This filing details stock transactions by Mark H. Bloom, Vice President of Arthur J. Gallagher & Co. (AJG) on March 15, 2026. Bloom acquired 3,506 restricted common shares under footnote F1, which then vested. Subsequently, these shares were disposed of. He also acquired 3,506 shares of common stock and disposed of 793 shares at $207.93 per share. The filing also reports holdings in various derivative instruments, including non-qualified stock options and phantom stock, with details on exercise prices, expiration dates, and underlying share counts. Additionally, Bloom holds 193.263 shares of common stock through the Gallagher 401(k) plan.