Headquartered in Chicago, Aon Corporation is the world's leading comprehensive group company integrating risk management services, insurance brokers and reinsurance brokers, human resources consulting services and special risk underwriting, and the largest risk management and insurance brokerage company in the world. Aon Group is a listed company in new york Stock Exchange (stock code AOC). In 2006, its global revenue was $654.38+003 billion, ranking 247th in the Fortune 500 in 2007. At present, Aon Group has 43,000 employees in 500 branches in more than 65,438+020 countries.