Aon plc — Director's Dealing 2010

Mar 2, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AON CORP (AOC)
CIK: 0000315293
Period of Report: 2010-02-26

Reporting Person: MORRISON ROBERT S (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-02-26	Phantom Stock	$	A	580.117	Acquired		Common Stock (580.117)	Direct

Footnotes

F1: The phantom stock units convert to shares of common stock on a 1-for-1 basis.

F2: The phantom stock units represent an outside director fee that was deferred into a directors' deferred compensation arrangement.

F3: The phantom stock units will be paid in cash or shares of Aon common stock on a distribution date elected by the reporting person.

F4: Includes shares acquired pursuant to dividend reinvestment.