Aon plc — Director's Dealing 2012

Feb 28, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AON CORP (AON)
CIK: 0000315293
Period of Report: 2012-02-25

Reporting Person: McGill Stephen P (Chairman/CEO - ARS)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-25	Common Stock	M	4696	—	Acquired	195649	Direct
2012-02-25	Common Stock	F	1947	$47.53	Disposed	193702	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-25	Restricted Stock Unit Award (Right to Receive)	$	M	4696	Disposed	2012-02-25	Common Stock (4696)	Direct

Footnotes

F1: Shares of common stock acquired upon the vesting of a restricted stock unit award.

F2: Shares of common stock withheld by the issuer for the payment of withholding taxes in connection with the vesting of a restricted stock unit award.

F3: The restricted stock unit award converts to shares of common stock on a 1-for-1 basis.