Form 4 Filing by Cai Jin-Yong for Aon plc

On June 25, 2026, Cai Jin-Yong, a director at Aon plc, acquired 776 Class A Ordinary Shares through an annual grant at a nominal value of $0.01 per share, as per Irish law. The number of shares owned after this transaction is 8241.376. Additionally, on the same date, 396.524 Class A Ordinary Shares were withheld by the issuer for tax payment purposes related to the award. These shares were disposed of at a price of $315.95 per share, resulting in a post-transaction ownership of 7844.852 shares. The filing was signed on June 29, 2026.