| SC 13G | 2004-02-17 | AON CORP | ENDURANCE SPECIALTY HOLDINGS LTD | 379,851 | 18.6% | EDGAR |
| SC 13G/A | 2004-02-13 | CAPITAL RESEARCH & MANAGEMENT CO | AON CORP | 25,819,800 | 8.2% | EDGAR |
| SC 13G | 2004-02-12 | DAVIS SELECTED ADVISERS | AON CORP | 17,617,436 | - | EDGAR |
| SC 13G/A | 2004-02-10 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | AON CORP | 43,698,400 | 13.9% | EDGAR |
| SC 13G | 2004-02-06 | STATE STREET BANK & TRUST CO | AON CORP | 29,710,442 | 9.5% | EDGAR |
| SC 13D/A | 2003-12-30 | AON CORP | ACM GOVERNMENT OPPORTUNITY FUND INC | 4,034,436 | 31.5% | EDGAR |
| SC 13D/A | 2003-07-25 | AON CORP | ACM GOVERNMENT OPPORTUNITY FUND INC | 4,155,636 | 32.5% | EDGAR |
| SC 13G/A | 2003-05-08 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | AON CORP | 33,232,800 | 10.7% | EDGAR |
| SC 13D/A | 2003-04-21 | RYAN PATRICK G | AON CORP | 25,409,821 | 8.1% | EDGAR |
| SC 13D/A | 2003-04-07 | AON CORP | ACM GOVERNMENT OPPORTUNITY FUND INC | 4,390,736 | 34.5% | EDGAR |
| SC 13D/A | 2003-03-25 | RYAN PATRICK G | AON CORP | 27,402,939 | 8.8% | EDGAR |
| SC 13G | 2003-02-21 | DAVIS SELECTED ADVISERS | AON CORP | 17,039,848 | - | EDGAR |
| SC 13G | 2003-02-14 | LEVIN JOHN A & CO INC /NY/ | AON CORP | 19,544,763 | 7.2% | EDGAR |
| SC 13G/A | 2003-02-13 | CAPITAL RESEARCH & MANAGEMENT CO | AON CORP | 24,307,300 | 7.9% | EDGAR |
| SC 13G | 2003-02-12 | STATE STREET BANK & TRUST CO | AON CORP | 24,279,523 | 8.9% | EDGAR |
| SC 13G | 2003-01-10 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | AON CORP | 30,289,200 | 9.8% | EDGAR |
| SC 13D/A | 2002-08-13 | RYAN PATRICK G | AON CORP | 31,420,462 | 10.6% | EDGAR |
| SC 13G | 2002-07-22 | AON CORP | US AIRWAYS GROUP INC | 22,945,832 | 33.7% | EDGAR |
| SC 13G | 2002-02-15 | DAVIS SELECTED ADVISERS | AON CORP | 13,533,973 | 5.0% | EDGAR |
| SC 13G/A | 2002-02-11 | CAPITAL RESEARCH & MANAGEMENT CO | AON CORP | 17,161,900 | 6.4% | EDGAR |