Aon

=== SEC Form 3 — Statement of Changes in Beneficial Ownership === Document Type: 3 Period of Report: 2026-08-17 --- Issuer --- Name: Aon plc (AON) CIK: 0000315293 --- Reporting Owner --- Name: Virani Nadin CIK: 0002151120 Role: Officer (Interim CFO) --- Holdings --- [Holding #1] Security: Class A Ordinary Stock Ownership: D (Direct) [Holding #2] Security: Restricted Share Unit (Right to Receive) Ownership: D (Direct) Footnotes: [F2] 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 $0.01 per share issued to the reporting person. [F1] A restricted share unit award was granted on May 21, 2025 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 50% of the award vests on each of the first through second anniversary of the date of grant. [Holding #3] Security: Restricted Share Unit (Right to Receive) Ownership: D (Direct) Footnotes: [F2] 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 $0.01 per share issued to the reporting person. [F3] A restricted share unit award was granted on May 21, 2025 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 20% of the award vests on each of the first through fifth anniversary of the date of grant. --- Footnotes (Complete Index) --- F1: A restricted share unit award was granted on May 21, 2025 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 50% of the award vests on each of the first through second anniversary of the date of grant. F2: 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 $0.01 per share issued to the reporting person. F3: A restricted share unit award was granted on May 21, 2025 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 20% of the award vests on each of the first through fifth anniversary of the date of grant. --- Signature --- /s/ /s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Nadin Virani (2026-08-26)