SEC FORM 4

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Aigotti Diane

(Last)

(First)

(Middle)

AON CORPORATION - CORPORATE LAW DEPT

200 EAST RANDOLPH STREET, 8TH FLOOR

(Street)

CHICAGO

60601

(City)

(State)

(Zip)

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

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

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Senior VP & Treasurer

3. Date of Earliest Transaction (Month/Day/Year)
03/15/2007

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	03/16/2007		M⁽¹⁾		648	A	⁽¹⁾	949	D
Common Stock	03/16/2007		F⁽²⁾		191	D	$37.82	758	D
Common Stock	03/17/2007		M⁽¹⁾		428	A	⁽¹⁾	1,186	D
Common Stock	03/17/2007		F⁽²⁾		127	D	$37.82	1,059	D
Common Stock								540	I	Through Aon Savings Plan and ESOP

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Unit Award (Right to Receive)	⁽⁴⁾	03/15/2007		A		4,852		03/15/2008⁽³⁾	03/15/2010	Common Stock	4,852	$0	4,852	D
Restricted Stock Unit Award (Right to Receive)	⁽⁴⁾	03/16/2006		M			648	03/16/2007	03/16/2007	Common Stock	648	$0	2,265	D
Restricted Stock Unit Award (Right to Receive)	⁽⁴⁾	03/17/2007		M			428	03/17/2007	03/17/2007	Common Stock	428	$0	1,069	D

Explanation of Responses:

1. Shares of common stock acquired upon the vesting of a restricted stock unit award.

2. Shares of common stock withheld by the issuer for the payment of withholding taxes in connection with the vesting of a restricted stock unit award.

3. Restricted stock units will vest in accordance with the terms of the Aon Stock Incentive Plan as follows: 22.22% of the awards will vest on each of the first and second anniversaries of the date of grant, and 55.56% of the awards will vest on the third anniversary of the date of grant.

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

	/s/ Jennifer L. Kraft - by Jennifer L. Kraft pursuant to a power of attorney from Diane Aigotti	03/19/2007
	** 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 4 (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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