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Filing Details

Accession Number:: 0001179110-11-008629
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2011-05-25 22:41:58
Reporting Period:: 2011-05-23

Filing Date:: 2011-05-25
Accepted Time:: 2011-05-25 21:41:58
SEC Url:: Form 4 Filing

Issuer

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

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1407939	J Gregory Besio	C/O Aon Corporate Law Dept 200 East Randolph Street, 8Th Fl Chicago IL 60601	Evp/Cao	No	Yes	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2011-05-23	7,500	$51.50	43,807	No	4	S	Direct
Common Stock	Acquisiton	2011-05-23	13,468	$38.93	57,275	No	4	M	Direct
Common Stock	Disposition	2011-05-23	13,468	$51.50	43,807	No	4	S	Direct
Common Stock	Acquisiton	2011-05-23	7,083	$38.93	50,890	No	4	M	Direct
Common Stock	Acquisiton	2011-05-23	17,186	$43.64	68,076	No	4	M	Direct
Common Stock	Disposition	2011-05-23	17,186	$51.59	50,890	No	4	S	Direct
Common Stock	Acquisiton	2011-05-23	22,000	$40.91	72,890	No	4	M	Direct
Common Stock	Disposition	2011-05-23	22,000	$51.50	50,890	No	4	S	Direct

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

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2011-05-23	17,186	$0.00	17,186	$43.64
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2011-05-23	7,083	$0.00	7,083	$38.93
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2011-05-23	22,000	$0.00	22,000	$40.91
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2011-05-23	13,468	$0.00	13,468	$38.93

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2013-05-17	No	4	M	Direct
10,274	2015-03-19	No	4	M	Direct
0	2014-03-13	No	4	M	Direct
17,357	2015-03-19	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	6,597	Indirect	Through Aon Savings Plan and Supplemental Savings Plan

Footnotes

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $51.49 to $51.52, 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.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $51.54 to $51.63, 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: one-third of the options vested on each of the first through third anniversaries of the date of grant. The date of grant was May 17, 2007.
Stock option granted pursuant to the Aon Stock Incentive Plan.
Includes 151 shares held pursuant to the Aon employee stock purchase plan, and shares acquired pursuant to dividend reinvestment.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $51.50 to $51.54, 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: 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.
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 13, 2008.
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.