Aon plc — Director's Dealing 2011

Feb 23, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AON CORP (AOC)
CIK: 0000315293
Period of Report: 2011-02-20

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-20	Common Stock	M	1810	—	Acquired	124572	Direct
2011-02-20	Common Stock	F	715	$52.93	Disposed	123857	Direct
2011-02-22	Common Stock	M	5927	—	Acquired	129784	Direct
2011-02-22	Common Stock	F	2339	$52.24	Disposed	127445	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-02-20	Restricted Stock Unit Award (Right to Receive)	$	M	1810	Disposed	2011-02-20	Common Stock (1810)	Direct
2011-02-22	Restricted Stock Unit Award (Right to Receive)	$	M	5927	Disposed	2011-02-22	Common Stock (5927)	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.