Aon plc — Director's Dealing 2010

Jun 16, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AON CORP (AOC)
CIK: 0000315293
Period of Report: 2010-06-14

Reporting Person: Hayley Kathryn (ACW - Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-06-14	Common Stock	M	26667	—	Acquired	31528	Direct
2010-06-14	Common Stock	F	9883	$38.27	Disposed	21645	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-06-14	Restricted Stock Unit Award (Right to Receive)	$	M	26667	Disposed	2010-06-14	Common Stock (26667)	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.

F4: Includes 347 shares held through the Aon employee stock purchase plan.