Aon plc (AON) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-25 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Aon plc (AON) CIK: 0000315293 --- Reporting Owner --- Name: SANTONA GLORIA CIK: 0001179714 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Ordinary Stock Date: 2026-06-25 | Code: A (Grant or award) Shares: +776 Shares Owned After: 22,647.97 | Ownership: D (Direct) Footnotes: [F1] Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person. [F1] Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person. [Transaction #2] Security: Class A Ordinary Stock Date: 2026-06-25 | Code: F (Payment of exercise/tax) Shares: -186.235 | Price: $315.95 Total Value: $58,840.95 Shares Owned After: 22,461.735 | Ownership: D (Direct) Footnotes: [F2] Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award. --- Holdings --- [Holding #1] Security: Class A Ordinary Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person. F2: Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award. --- Signature --- /s/ /s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Gloria Santona (2026-06-29)