Aon plc Director Adriana Karaboutis Receives 776 Shares and Sells 186 Shares for Tax Withholding

This Form 4 filing reports that Adriana Karaboutis, a non-employee director of Aon plc, received 776 Class A Ordinary Shares as an annual grant on June 25, 2026. In accordance with Irish law, she paid the nominal value of $0.01 per share for these shares. On the same date, 186.235 shares were withheld by the issuer for payment of taxes in connection with the award, with the shares sold at $315.95 per share. Following these transactions, Karaboutis' total direct holdings decreased from 2,791.97 shares to 2,605.735 shares. The filing represents routine director compensation transactions involving stock awards and tax withholding, which are common practices for non-employee director compensation programs.