SANTONA GLORIA 4

What Happened

• Gloria Santona, a non-employee director of Aon plc (AON), was granted 776 Class A ordinary shares as her annual director award on June 25, 2026 (transaction code A). To satisfy tax withholding obligations, 186.235 of those shares were withheld by the issuer (transaction code F) at a reported per-share value of $315.95, totaling approximately $58,841. The award shares carry a nominal payment obligation of $0.01 per share under Irish law.

Key Details

• Transaction dates: June 25, 2026 (award and tax-withholding)
• Award: 776 shares granted (Class A Ordinary Shares); acquisition price not applicable for the award
• Tax withholding: 186.235 shares withheld at $315.95/share = ~$58,841 (payment of tax liability)
• Shares owned after transaction: not disclosed in this Form 4
• Footnotes: F1 — annual Class A share grant to non-employee directors; reporting person paid $0.01 per share per Irish law. F2 — shares withheld by issuer to cover taxes.
• Filing timeliness: Report filed June 29, 2026; this appears to be a timely Form 4 filing following the June 25 transaction.

Context

• This was a routine director compensation award, not an open-market purchase or sale by the insider. The withholding of shares to cover taxes is a common administrative step and does not necessarily indicate any change in the director’s view of the company. Transaction codes: A = award/grant; F = payment of exercise price or tax liability (withholding).