Mead Christopher E plan to sell securities of Arthur J. Gallagher & Co. under Form 144

Mead Christopher E filed Form 144 to notify SEC of plan to sell 4000 units of Arthur J. Gallagher & Co. securities around 2025-12-23, with aggregate market value of $1,032,440.44. The total outstanding units is 256800000.0. The amount planned to be sold represents 0.00% of total outstanding units; Recent transactions in past 3 months include: On 11/21/2025, sold 1250 units for $313426.13;