| SC 13G | 2010-02-12 | STATE STREET Corp | AON CORP | - | 5.2% | EDGAR |
| SC 13G | 2010-02-11 | PRICE T ROWE ASSOCIATES INC /MD/ | AON CORP | 17,250,176 | 6.2% | EDGAR |
| SC 13G | 2010-02-11 | Capital World Investors | AON CORP | 25,337,742 | 9.2% | EDGAR |
| SC 13G | 2010-02-05 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | AON CORP | 13,811,118 | 5.0% | EDGAR |
| SC 13G | 2009-02-17 | STATE STREET BANK & TRUST CO | AON CORP | 17,483,844 | 6.5% | EDGAR |
| SC 13G/A | 2009-02-13 | DAVIS SELECTED ADVISERS | AON CORP | 0 | 0.0% | EDGAR |
| SC 13G/A | 2009-02-13 | LORD ABBETT & CO LLC | AON CORP | 11,633,573 | 4.3% | EDGAR |
| SC 13G/A | 2008-11-06 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | AON CORP | 5,427,025 | 2.0% | EDGAR |
| SC 13G/A | 2008-10-08 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | AON CORP | 13,988,209 | 5.0% | EDGAR |
| SC 13G | 2008-02-14 | LORD ABBETT & CO LLC | AON CORP | 16,114,872 | 5.5% | EDGAR |
| SC 13G/A | 2008-02-13 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | AON CORP | 30,470,323 | 10.4% | EDGAR |
| SC 13G/A | 2008-02-13 | DAVIS SELECTED ADVISERS | AON CORP | 15,696,306 | 5.4% | EDGAR |
| SC 13G | 2008-02-12 | STATE STREET BANK & TRUST CO | AON CORP | 17,619,590 | 6.0% | EDGAR |
| SC 13D/A | 2007-02-14 | AON CORP | ACM GOVERNMENT OPPORTUNITY FUND INC | 0 | 0.0% | EDGAR |
| SC 13G/A | 2007-02-14 | AON CORP | ENDURANCE SPECIALTY HOLDINGS LTD | 0 | 0.0% | EDGAR |
| SC 13G/A | 2007-02-12 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | AON CORP | 40,303,800 | 13.0% | EDGAR |
| SC 13G | 2007-02-12 | STATE STREET BANK & TRUST CO | AON CORP | 16,307,230 | 5.3% | EDGAR |
| SC 13G | 2007-02-12 | NWQ INVESTMENT MANAGEMENT CO LLC | AON CORP | 22,383,721 | 7.2% | EDGAR |
| SC 13G/A | 2007-01-11 | DAVIS SELECTED ADVISERS | AON CORP | 17,007,876 | 5.3% | EDGAR |
| SC 13D/A | 2006-09-19 | AON CORP | ACM GOVERNMENT OPPORTUNITY FUND INC | 3,425,736 | 26.5% | EDGAR |