AOC Aon Corp.

CHICAGO, July 21 /PRNewswire-FirstCall/ -- Aon Corporation (NYSE:AOC) has been ranked as the world's largest insurance broker by Business Insurance, a leading weekly insurance publication published by Crain Communications. The ranking is published in the magazine's July 21 edition. (Logo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO) With 2007 commercial retail, wholesale, reinsurance and personal lines brokerage revenues of $5.753 billion, Aon bested its next largest competitor, Marsh & McLennan Companies, by $351 million, underscoring that more companies trust Aon to ensure they are ready to meet the challenges and opportunities they face. "These results show that Aon continues to be in growth mode," said Gregory C. Case, president and chief executive officer. "We will continue to make significant investments in our industry-leading capabilities so that we deliver to our clients unmatched broking with innovations and value-based advice." Aon also was ranked as the world's number one broker by A.M. Best & Co., which published its broker rankings in the July 1, 2008, edition of Best's Review. About Aon Aon Corporation (NYSE:AOC) is the leading global provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting. Through its 36,000 colleagues worldwide, Aon readily delivers distinctive client value via innovative and effective risk management and workforce productivity solutions. Our industry-leading global resources, technical expertise and industry knowledge are delivered locally through more than 500 offices in more than 120 countries. Aon was named the world's "best broker" by Euromoney magazine's 2008 Insurance Survey. In 2008 Aon was ranked as the world's largest insurance broker by Business Insurance. Aon also was ranked by A.M. Best as the number one global insurance brokerage in 2007 and 2008 based on brokerage revenues, and voted best insurance intermediary, best reinsurance intermediary, and best employee benefits consulting firm in 2007 by the readers of Business Insurance. For more information on Aon, log onto http://www.aon.com/. http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO http://photoarchive.ap.org/ DATASOURCE: Aon Corporation CONTACT: Rahsaan Johnson of Aon Corporation, +1-312-381-2684, Web site: http://www.aon.com/

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