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: Case Gregory C (Director, Pres & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-20	Common Stock	M	3003	—	Acquired	437546	Direct
2011-02-20	Common Stock	F	1245	$52.93	Disposed	436301	Direct
2011-02-22	Common Stock	M	10272	—	Acquired	446573	Direct
2011-02-22	Common Stock	F	4258	$52.24	Disposed	442315	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	3003	Disposed	2011-02-20	Common Stock (3003)	Direct
2011-02-22	Restricted Stock Unit Award (Right to Receive)	$	M	10272	Disposed	2011-02-22	Common Stock (10272)	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.