Marsh & McLennan Companies Email Format

Financial ServicesNew York, United States10001+ Employees

Marsh & McLennan Companies is a multinational financial services firm that provides risk management, strategic advisory, and people-focused services. It operates through four units—Marsh Risk, Guy Carpenter, Mercer, and Oliver Wyman—and serves clients in 130 countries. The organization helps clients identify and quantify risks, develop risk management strategies, and address workforce and organizational needs.

It is based in New York City and functions as a professional services firm within the risk and advisory field. In November 2025, Marsh McLennan International announced the appointment of James Addington-Smith as CEO of Marsh UK, reflecting leadership changes across its regional businesses.

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