Aon group (AON), the world's leading insurance group, was formed by the merger of Ryan insurance group and United International in 1982. Its headquarters moved from Chicago to London in June 2012 and was listed on the New York Stock Exchange. AON is mainly engaged in risk management services, insurance brokerage and reinsurance brokerage, human resources consulting services, etc., and its three business segments - AON Insurance scheme (ARS), Aon Benfield and AON Hewitt - have become the three benchmarks in the world.
