Aon plc — Director's Dealing 2010

Feb 17, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AON CORP (AOC)
CIK: 0000315293
Period of Report: 2010-02-15

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-02-15	Common Stock	M	3013	—	Acquired	27224	Direct
2010-02-15	Common Stock	F	977	$39.81	Disposed	26247	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-02-15	Restricted Stock Unit Award (Right to Receive)	$	M	3013	Disposed	2010-02-15	Common Stock (3013)	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: Includes 3,742 shares held through the Aon employee stock purchase plan.

F4: The restricted stock unit award converts to shares of common stock on a 1-for-1 basis.