X0508 4 2024-02-12 0000315293 Aon plc AON 0001322803 Case Gregory C 200 EAST RANDOLPH ST. CHICAGO IL 60601 true true false false Chief Executive Officer false Class A Ordinary Stock 2024-02-12 4 M false 1765 A 302002 D Class A Ordinary Stock 2024-02-12 4 F false 745.159 310.03 D 301256.841 D Class A Ordinary Stock 222985 I By GRAT Class A Ordinary Stock 128052 I By Trust Class A Ordinary Stock 128052 I By Trust Class A Ordinary Stock 145486 I By Trust Class A Ordinary Stock 145485 I By Trust Class A Ordinary Stock 400000 I By GRAT Restricted Share Unit (Right to Receive) 2024-02-12 4 M false 1765 0 D 2024-02-12 Class A Ordinary Shares 1765 0 D Class A Ordinary Shares acquired upon the vesting of a restricted share unit award. Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award. The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of US$0.01 per share issued to the reporting person. A restricted share unit award was granted on February 12, 2021 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant. /s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Greg Case 2024-02-13