Aon plc Director Gloria Santona Receives Annual Stock Award and Tax Withholding Transaction

This Form 4 filing reports transactions by Gloria Santona, a non-employee director of Aon plc, on June 25, 2026. Santona received 776 Class A Ordinary Shares as an annual grant to non-employee directors, for which she agreed to pay the nominal value of $0.01 per share in accordance with Irish law. Additionally, 186.235 shares were withheld by the issuer for tax payment purposes at a price of $315.95 per share. Following these transactions, Santona directly holds 22,461.735 shares and indirectly holds 17,736 shares through a trust. The filing demonstrates standard director compensation practices including annual equity awards and tax withholding procedures for equity-based compensation.