X0508 4 2026-02-12 0000315293 Aon plc AON 0001322803 Case Gregory C 200 EAST RANDOLPH ST. CHICAGO IL 60601 true true false false President & CEO false Class A Ordinary Stock 2026-02-12 4 A false 71868 A 968497.759 D Class A Ordinary Stock 2026-02-12 4 F false 32246.147 314.49 D 936251.612 D Class A Ordinary Stock 2026-02-12 4 A false 4589 A 940840.612 D Class A Ordinary Stock 2026-02-12 4 F false 2059.019 314.49 D 938781.593 D Class A Ordinary Stock 129029 I By Trust Class A Ordinary Stock 129029 I By Trust Class A Ordinary Stock 163964 I By Trust Class A Ordinary Stock 163963 I By Trust Class A Ordinary Stock 37412 I By GRAT Class A Ordinary Stock 73240 I By GRAT Represents Class A Ordinary Shares issued upon the settlement of performance share unit awards originally granted approximately three years ago under the eighteenth cycle of the Company's Leadership Performance Program. The number of shares issued was determined by the Organization and Compensation Committee of the Board of Directors on February 12, 2026, based on the Company's performance for the period from January 1, 2023 to December 31, 2025. Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award. On May 5, 2025, the GRAT returned 161,104 shares to the reporting person as an annuity payment; and on February 9, 2026 the GRAT returned 201,484 shares to the reporting person as an annuity payment. On November 7, 2025, the GRAT returned 63,500 shares to the reporting person as an annuity payment. /s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Greg Case 2026-02-17