Bay Walter D. plan to sell securities of Arthur J. Gallagher & Co. under Form 144

Bay Walter D. filed Form 144 to notify SEC of plan to sell 15850 units of Arthur J. Gallagher & Co. securities around 2025-12-19, with aggregate market value of $4,041,750.00. The total outstanding units is 256800000.0. The amount planned to be sold represents 0.01% of total outstanding units;