Aon plc — Director's Dealing 2012

Aug 3, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Aon plc (AON)
CIK: 0000315293
Period of Report: 2012-08-01

Reporting Person: Besio Gregory J (EVP/Chief HR Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-01	Class A Ordinary Shares	M	10274	$38.93	Acquired	87680.43	Direct
2012-08-01	Class A Ordinary Shares	S	10274	$49.573	Disposed	77406.43	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-01	Employee Share Option (Right to Buy)	$38.93	M	10274	Disposed	2015-03-19	Class A Ordinary Shares (10274)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Ordinary Shares	7739	Indirect

Footnotes

F1: Includes 188.002 shares acquired pursuant to the Aon employee stock purchase plan and shares acquired pursuant to dividend reinvestment.

F2: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $49.55 to $49.63, inclusive. The reporting person undertakes to provide to Aon plc, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3: Vesting of the options occurred in accordance with the terms of the Aon Stock Incentive Plan as follows: one-third of the options vested on each of the first through third anniversaries of the date of grant. The date of grant was March 19, 2009

F4: Share option granted pursuant to the Aon Stock Incentive Plan.