X0306 5 2013-12-31 0 0 0 0000315293 Aon plc AON 0001407939 Besio Gregory J C/O AON CORPORATE LAW DEPT 200 EAST RANDOLPH STREET, 8TH FL CHICAGO IL 60601 0 1 0 0 EVP/Chief HR Officer Class A Ordinary Shares 2013-05-08 5 G 0 1085 0 D 90524.85 D Includes 153.63 shares acquired pursuant to the Aon employee stock purchase plan and shares acquired pursuant to dividend reinvestment. /s/ Matthew M. Rice - by Matthew M. Rice pursuant to a power of attorney from Gregory J. Besio 2014-02-14