SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

McGill Stephen P

(Last)

(First)

(Middle)

C/O AON CORPORATE LAW DEPT

200 EAST RANDOLPH STREET, 8TH FL

(Street)

CHICAGO

60601

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
03/17/2006

3. Issuer Name and Ticker or Trading Symbol
AON CORP [ AOC ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	CEO - ARSA

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	0	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Restricted Stock Unit Award (Right to Receive)	⁽¹⁾	05/15/2015	Common Stock	137,500	⁽²⁾	D
Restricted Stock Unit Award (Right to Receive)	⁽³⁾	03/16/2011	Common Stock	14,565	⁽²⁾	D
Restricted Stock Unit Award (Right to Receive)	⁽⁴⁾	03/16/2009	Common Stock	18,772	⁽²⁾	D
Employee Stock Option (Right to Buy)	⁽⁵⁾	03/16/2012	Common Stock	45,515	$41.195	D

Explanation of Responses:

1. Restricted stock unit awards will vest in accordance with the Aon Stock Incentive Plan as follows: 20% of the awards will vest on each of the third and tenth anniversaries of the date of grant, and 10% of the awards will vest on each of the fourth through ninth anniversaries of the date of grant. The date of grant was May 15, 2005.

2. The restricted stock unit award converts to shares of common stock on a 1-for-1 basis.

3. Restricted stock unit awards will vest in accordance with the Aon Stock Incentive Plan as follows: one-third of the awards will vest on each of the third through fifth anniversaries of the date of grant. The date of grant was March 16, 2006.

4. Restricted stock unit awards will vest in accordance with the Aon Stock Incentive Plan as follows: 5,477 of the awards will vest on the first anniversary of the date of grant, 5,475 of the awards will vest on the second anniversary of the date of grant and 7,820 of the awards will vest on the third anniversary of the date of grant. The date of grant was March 16, 2006.

5. Vesting will occur in accordance with 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.

	/s/ Jennifer L. Kraft - by Jennifer L. Kraft pursuant to a power of attorney from Stephen P. McGill	03/27/2006
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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