X0101 4/A 2003-05-15 2003-05-19 0 0000315293 AON CORP AOC 0001145037 RYAN PATRICK G 1 1 0 0 Chairman and CEO Common Stock 2003-05-15 4 F 0 27982 24.82 D 13148755 D Shares of common stock withheld by issuer for payment of withholding taxes on the conversion of phantom stock into shares of common stock. On the reporting person's Form 4 that is being amended, this number was incorrectly reported as 64,931. On the reporting person's Form 4 that is being amended, this number was incorrectly reported as 13,111,806. The reporting person also is the indirect beneficial owner of the following securities: 365,876 by ESOP and Savings Plan; 9,951,953 by Spouse; 583,942 by Spouse as Trustee. /s/ Patrick G. Ryan 2003-07-08