X0306 4 2022-02-25 0 0000315293 Aon plc AON 0001782945 Zeidel Darren 200 EAST RANDOLPH ST. CHICAGO IL 60601 0 1 0 0 General Counsel Class A Ordinary Stock 2022-02-25 4 S 0 317 290.00 D 15129 D The transactions reported were effected pursuant to a trading plan meeting the requirements of SEC Rule 10b5-1 entered into on November 23, 2021. /s/ Julie Cho - Julie Cho pursuant to a power of attorney from Darren Zeidel 2022-03-01