Marsh McLennan, founded in 1905 in Chicago, Illinois, is a global professional services firm specializing in risk management, insurance brokerage, reinsurance, and consulting. Headquartered in New York City, the company operates through four main businesses: Marsh, Guy Carpenter, Mercer, and Oliver Wyman. These units provide services ranging from insurance and reinsurance broking to human resources consulting, investment advisory, and strategic management consulting. Marsh McLennan became a publicly traded company in 1962 and is listed on the New York Stock Exchange under the ticker symbol MMC. Over the years, the firm has expanded through strategic acquisitions, including Guy Carpenter in 1923 and Mercer in 1959, solidifying its position as the world’s largest insurance broker. Today, Marsh McLennan serves clients globally across diverse industries, offering solutions that address complex risk and workforce challenges.
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