Aon plc is a publicly traded multinational professional services firm headquartered in London, United Kingdom, with operational headquarters in Chicago, Illinois. Founded in 1982 through the merger of Ryan Insurance Group and Combined International Corporation, Aon has grown into one of the world’s largest insurance brokers and risk advisors. The company operates across two primary segments: Risk Capital, which includes insurance and reinsurance brokerage, risk consulting, and cyber solutions, and Human Capital, which provides health, retirement, and talent advisory services. Aon serves clients in over 120 countries, leveraging data analytics and technology to deliver integrated solutions that help organizations manage risk and optimize workforce strategies. Listed on the New York Stock Exchange under the ticker symbol AON, the firm reported revenues of $15.7 billion in 2024 and employs approximately 66,000 people worldwide.
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