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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
315293	Aon Corp	AON	Insurance Agents, Brokers & Service (6411)	363051915

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1357133	P Stephen Mcgill	C/O Aon Corporate Law Dept 200 East Randolph Street, 8Th Fl Chicago IL 60601	Chairman/Ceo - Ars	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2012-02-10	45,515	$41.20	186,696	No	4	M	Direct
Common Stock	Disposition	2012-02-10	45,515	$48.65	141,181	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Common Stock	Disposition	2012-02-10	45,515	$0.00	45,515	$41.20

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2012-03-16	No	4	M	Direct

Footnotes

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.64 to $48.68, inclusive. The reporting person undertakes to provide to Aon Corporation, 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.
Vesting of the options occurred in accordance with the terms of the Aon Stock Incentive Plan as follows: 33.34% of the options will vest on the first anniversary of the date of grant, and 33.33% of the options will vest on each of the second and third anniversaries of the date of grant. The date of grant was March 16, 2006.
Stock option granted pursuant to the Aon Stock Incentive Plan.