Aon plc — Director's Dealing 2011

Mar 1, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AON CORP (AOC)
CIK: 0000315293
Period of Report: 2011-02-25

Reporting Person: O'Connor Michael J (ARS - COO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-25	Common Stock	M	2847	—	Acquired	29137	Direct
2011-02-25	Common Stock	F	1181	$52.49	Disposed	27956	Direct
2011-02-28	Common Stock	M	17000	—	Acquired	44956	Direct
2011-02-28	Common Stock	F	7047	$52.64	Disposed	37909	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-02-25	Restricted Stock Unit Award (Right to Receive)	$	M	2847	Disposed	2011-02-25	Common Stock (2847)	Direct
2011-02-28	Restricted Stock Unit Award (Right to Receive)	$	M	17000	Disposed	2011-02-28	Common Stock (17000)	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.