Aon plc — Director's Dealing 2010

Feb 23, 2010

SEC Form 4/A — Form 4/A

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	26145	Direct
2010-02-15	Common Stock	F	977	$39.81	Disposed	25168	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 2,663 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.

F5: In prior filings commencing in July 2009, the balance held by the reporting person through the Aon employee stock purchase plan was incorrectly reported due to an administrative error, resulting in over-reporting of the amount of securities beneficially owned by the reporting person as reported in Column 5 of Table I of Form 4. This amendment is being filed to show the correct number of shares held by the reporting person, both in Column 5 of Table I and in footnote 3.