Aon plc — Director's Dealing 2011

Feb 24, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AON CORP (AOC)
CIK: 0000315293
Period of Report: 2011-02-22

Reporting Person: FARMER JEREMY G O (Senior VP & Head of HR)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-22	Common Stock	M	17500	$41.195	Acquired	78801	Direct
2011-02-22	Common Stock	F	15228	$52.93	Disposed	63573	Direct
2011-02-22	Common Stock	M	8920	$27.03	Acquired	72493	Direct
2011-02-22	Common Stock	F	6364	$52.93	Disposed	66129	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-02-22	Employee Stock Option (Right to Buy)	$41.195	M	17500	Disposed	2012-03-16	Common Stock (17500)	Direct
2011-02-22	Employee Stock Option (Right to Buy)	$27.03	M	8920	Disposed	2014-07-16	Common Stock (8920)	Direct

Footnotes

F1: Includes 924 shares held pursuant to the Aon employee stock purchase plan.

F2: The original option grant of 23,668 shares vested as follows: one-third of the shares vested on each of March 16, 2007, March 16, 2008 and March 16, 2009.

F3: The original option grant of 13,920 shares vested 100% on July 16, 2009.