X0303 4 2011-02-17 0 0000315293 AON CORP AOC 0001407939 Besio Gregory J C/O AON CORPORATE LAW DEPT 200 EAST RANDOLPH STREET, 8TH FL CHICAGO IL 60601 0 1 0 0 EVP/CAO Common Stock 2011-02-17 4 A 0 38133 A 59109 D Common Stock 2011-02-17 4 F 0 13901 51.92 D 45208 D Common Stock 6128 I Through Aon Savings Plan and Supplemental Savings Plan Restricted Stock Unit Award (Right to Receive) 2011-02-17 4 A 0 5561 0 A 2012-02-17 2014-02-17 Common Stock 5561 5561 D Represents shares of common stock issued upon the settlement of performance share units originally granted approximately three years ago under the third cycle of the Leadership Performance Program ("LPP3") on March 13, 2008. The number of shares issued was determined by the Organization and Compensation Committee of Aon's Board of Directors on February 17, 2011 based upon Aon's performance relative to a cumulative adjusted three year earnings per share target for the period beginning January 1, 2008 and ending December 31, 2010. In accordance with the terms of LPP3, and the achievement of specified growth targets under LPP3, settlement occurred at 130% of the original target value. The terms of LPP3 are more fully described in a Current Report on Form 8-K filed with the SEC on March 19, 2008, and in the plan document filed as Exhibit 10.3 to Aon's Quarterly Report on Form 10-Q for the quarter ended March 31, 2008 filed with the SEC on May 9, 2008. Shares of common stock withheld by the issuer for the payment of withholding taxes in connection with the settlement of a performance share unit award. The restricted stock unit award converts to shares of common stock on a 1-for-1 basis. The restricted stock unit award will vest in accordance with the terms of the Aon Stock Incentive Plan as follows: 33 1/3% of the awards will vest on each of the first through third anniversaries of the date of grant. As a result of an administrative error, the number of shares of Aon common stock beneficially owned by the reporting person was overstated in a Form 4 filed with the SEC on July 7, 2010. The number of shares of Aon common stock beneficially owned by the reporting person is accurately reflected in this filing. Includes 151 shares held pursuant to the Aon employee stock purchase plan. /s/ Jennifer L. Kraft - by Jennifer L. Kraft pursuant to a power of attorney from Gregory J. Besio 2011-02-22