Aon plc — Director's Dealing 2010

Feb 1, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AON CORP (AOC)
CIK: 0000315293
Period of Report: 2010-01-31

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

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-01-31	Phantom Stock	$	A	8.37	Acquired		Common Stock (8.37)	Direct

Footnotes

F1: Each share of phantom stock acquired under the issuer's deferred compensation plan represents the right to receive one share of Aon common stock or the cash value thereof.

F2: Shares of phantom stock are payable in cash in ten annual installments following the reporting person's retirement. Subject to the issuer's compliance procedures for its Section 16 reporting officers, the reporting person may transfer shares of common stock into an alternative investment account under the issuer's deferred compensation plan.