Company:  AON CORP (AOC)
Form Type:  10-K
Filing Date:  3/2/2009 
CIK:  0000315293 
Address:  200 EAST RANDOLPH STREET 
City, State, Zip:  CHICAGO, Illinois 60601 
Telephone:  (312) 381-1000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$39.03   		Change: 
-0.04 (-0.10%)  
Trade Time: 
Nov 20   		Market Cap: 
$10.69B
Description of Business
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  FORM 10-K
    PART I
      Item 1. Business.
      Item 1A. Risk Factors.
      Item 1B. Unresolved Staff Comments.
      Item 2. Properties.
      Item 3. Legal Proceedings.
      Item 4. Submission of Matters to a Vote of Security Holders.
        NAME AND TITLE
        NAME AND TITLE
    PART II
      Item 5. Market for Registrant's Common Equity, Related ...
      Item 7. Management's Discussion and Analysis of Financial ...
        INCOME STATEMENT
      Item 7A. Quantitative and Qualitative Disclosures About ...
      Item 8. Financial Statements and Supplementary Data.
        Report of Independent Registered Public Accounting Firm on
        INCOME STATEMENT
        BALANCE SHEET
        CASH FLOW
        STOCKHOLDERS EQUITY
        Notes to Consolidated Financial Statements
        OPTIONS AGGREGATE
      Item 9. Changes in and Disagreements with Accountants on ...
      Item 9A. Controls and Procedures.
      Item 9B. Other Information.
    PART III
      Item 10. Directors, Executive Officers and Corporate ...
      Item 11. Executive Compensation.
      Item 12. Security Ownership of Certain Beneficial Owners ...
      Item 13. Certain Relationships and Related Transactions, ...
      Item 14. Principal Accountant Fees and Services.
    PART IV
      Item 15. Exhibits and Financial Statement Schedules.
    Section 1350 Certifications.
    SIGNATURES
  EXHIBIT 3.4
    BY-LAWS
  EXHIBIT 10.53
  EXHIBIT 12.1
    RATIO COMPUTATION
  EXHIBIT 12.2
    RATIO COMPUTATION
  EXHIBIT 21
  EXHIBIT 23
    CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
  EXHIBIT 31.1
    CERTIFICATIONS
  EXHIBIT 31.2
    CERTIFICATIONS
  EXHIBIT 32.1
  EXHIBIT 32.2
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