Edgar Filing: RYAN PATRICK G

Ownership Submission

FORM 4

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:

3235-0287

Expires:

January 31, 2005

Estimated average burden hours per response...

0.5

(Print or Type Responses)

1. Name and Address of Reporting Person ^*

RYAN PATRICK G

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

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

__X__ Director	_____ 10% Owner
__X__ Officer (give title below)	_____ Other (specify below)
Executive Chairman

(Last)

(First)

(Middle)

C/O AON CORPORATE LAW DEPARTMENT, 8TH FLOOR, 200 EAST RANDOLPH DRIVE

3. Date of Earliest Transaction (Month/Day/Year)
09/09/2005

(Street)

CHICAGO, IL 60601

4. If Amendment, Date 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

(City)

(State)

(Zip)

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	09/09/2005		S		12,500 ⁽¹⁾	D	$ 31.16	11,352,494 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		2,400 ⁽¹⁾	D	$ 30.12	11,350,094 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		500 ⁽¹⁾	D	$ 29.97	11,349,594 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		200 ⁽¹⁾	D	$ 30.41	11,349,394 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		2,300 ⁽¹⁾	D	$ 30.64	11,347,094 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		20,700 ⁽¹⁾	D	$ 31.25	11,326,394 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		1,200 ⁽¹⁾	D	$ 31.39	11,325,194 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		9,400 ⁽¹⁾	D	$ 31	11,315,794 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		8,600 ⁽¹⁾	D	$ 31.9	11,307,194 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		200 ⁽¹⁾	D	$ 31.72	11,306,994 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		300 ⁽¹⁾	D	$ 31.55	11,306,694 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		17,000 ⁽¹⁾	D	$ 31.12	11,289,694 ⁽²⁾ ⁽³⁾	D
Common Stock	09/09/2005		S		1,200 ⁽¹⁾	D	$ 30.5	11,288,494 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		1,200 ⁽¹⁾	D	$ 32.6	11,287,294 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		2,600 ⁽¹⁾	D	$ 32.46	11,284,694 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		7,000 ⁽¹⁾	D	$ 31.95	11,277,694 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		3,300 ⁽¹⁾	D	$ 32.59	11,274,394 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		2,100 ⁽¹⁾	D	$ 32.38	11,272,294 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		1,800 ⁽¹⁾	D	$ 32.57	11,270,494 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		100 ⁽¹⁾	D	$ 32.63	11,270,394 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		700 ⁽¹⁾	D	$ 32.4	11,269,694 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		1,300 ⁽¹⁾	D	$ 32.61	11,268,394 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		1,000 ⁽¹⁾	D	$ 31.39	11,267,394 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		2,900 ⁽¹⁾	D	$ 31.97	11,264,494 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		1,400 ⁽¹⁾	D	$ 32.65	11,263,094 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		1,900 ⁽¹⁾	D	$ 32.54	11,261,194 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		600 ⁽¹⁾	D	$ 31.41	11,260,594 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		3,000 ⁽¹⁾	D	$ 32.46	11,257,594 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		3,000 ⁽¹⁾	D	$ 31.98	11,254,594 ⁽²⁾ ⁽³⁾	D
Common Stock	09/12/2005		S		1,700 ⁽¹⁾	D	$ 32.64	11,252,894 ⁽²⁾ ⁽³⁾	D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
	Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.		SEC 1474 (9-02)

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 Underlying Securities
(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 of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)

11. Nature of Indirect Beneficial Ownership
(Instr. 4)

Code

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
RYAN PATRICK G C/O AON CORPORATE LAW DEPARTMENT 8TH FLOOR, 200 EAST RANDOLPH DRIVE CHICAGO, IL 60601	X		Executive Chairman

Signatures

/s/ Patrick G. Ryan		09/13/2005
^**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 25, 2005.
(2)	The reporting person is also the indirect beneficial owner of the following securities: 388,740 by ESOP and Savings Plan; 583,942 by Spouse as Trustee.
(3)	Amount reported includes 2,645 shares received in connection with a distribution from an Employee Stock Ownership Plan (3,674 shares distributed less 1,029 shares withheld for taxes).
Remarks: Form 5 of 11

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.