Corporate Information

Aon plc
The Metropolitan Building
James Joyce Street
Dublin D01
Ireland
tel: +353 1 26 6000

Aon Global Operational Headquarters
The Aon Centre
The Leadenhall Building
122 Leadenhall Street
London England EC3V 4AN
tel: +44 (0) 20 7623 5500
fax: +44 (0) 20 7621 1511

Contact Shareholder Relations
Aon plc
c/o Investor Relations
200 East Randolph
Chicago, IL  60601
(866) 657-8632 (within the U.S. and Canada)
Outside the U.S. and Canada: (312) 381-1052
[email protected]

Stock Trading
Aon plc's common stock is listed on the New York Stock Exchange.
Ticker symbol: AON

Transfer Agent and Dividend Reinvestment Services Administrator
Computershare
P.O. Box 43069
Providence, RI 02940-3069

Within the U.S. and Canada: (800) 446-2617
Outside the U.S. and Canada: (781) 575-2723
TDD/TTY for hearing impaired: (800) 952-9245

www.computershare.com/Equiserve

Independent Registered Public Accounting Firm
Ernst & Young LLP