Marsh & McLennan Companies, Inc. is headquartered at 1166 Avenue of the Americas in New York City and was founded in 1871. The company operates through four market-leading businesses: Marsh (insurance brokerage and risk management), Guy Carpenter (reinsurance), Mercer (consulting on health, retirement, and benefits), and Oliver Wyman (management consulting). As of 2025, Marsh & McLennan generated $26.981 billion in revenue and employed approximately 95,000 people globally.
The company operates two main segments: Risk and Insurance Services (54% of 2025 revenues via Marsh, 10% via Guy Carpenter) and Consulting (23% via Mercer, 13% via Oliver Wyman Group). Marsh advises around 95% of Fortune 1000 companies and serves clients across virtually every industry globally. Major subsidiaries include Marsh, Guy Carpenter, Mercer, and Oliver Wyman, with Lippincott and NERA Economic Consulting under Oliver Wyman.
Recent leadership news
In March 2026, Nick Studer became President and CEO of Marsh Risk, succeeding Martin South, who took on the role of Chief Client Officer. In April 2026, Mark McGivney was appointed Executive Vice President and Chief Operating Officer in addition to his role as Chief Financial Officer.
Facts compiled by Executive Moves from publicly available news and press releases on 22 September 2026. Spotted an inaccuracy? Email us and we'll review within 1 business day.
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