Aon plc — Director's Dealing 2012

Feb 21, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AON CORP (AON)
CIK: 0000315293
Period of Report: 2012-02-16

Reporting Person: LIEB PETER M (EVP & General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-17	Common Stock	M	1742	—	Acquired	3405.189	Direct
2012-02-17	Common Stock	F	576	$47.62	Disposed	2829.189	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-16	Restricted Stock Unit Award (Right to Receive)	$	A	4599	Acquired	2015-02-16	Common Stock (4599)	Direct
2012-02-17	Restricted Stock Unit Award (Right to Receive)	$	M	1742	Disposed	2012-02-17	Common Stock (1742)	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: The restricted stock unit award will vest in accordance with the terms of the Aon Stock Incentive Plan as follows: 33 1/3% of the awards will vest on each of the first through third anniversaries of the date of grant.

F5: Includes 188.537 shares acquired under the Aon employee stock purchase plan.