Aon Corporation (NYSE: AON) is an American public multinational corporation headquartered in Chicago, Illinois, USA that provides risk management services, insurance and reinsurance brokerage, human capital and management consulting. Aon has approximately 500 offices worldwide, serving 120 countries with 59,000 employees.
In 2011, Aon was ranked number 287 on the Fortune 500 list. Aon is the largest reinsurance broker in the world. In 2010, Aon was ranked as the second largest insurance broker in the world based on brokerage revenue. Aon is known internationally as the principal sponsor of the English Premier League team Manchester United.
Aon was created in 1982, when the Ryan Insurance Group (founded by Pat Ryan in the 1960s) merged with the Combined Insurance Company of America (founded by W. Clement Stone in 1919). In 1987, that company was renamed to Aon, a Gaelic word meaning oneness. Combined Insurance was sold to ACE Limited in April 2008.
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