Marsh McLennan
Building the confidence to thrive through the power of perspective.
About Marsh McLennan
Marsh McLennan is a global professional services firm that advises clients on risk, strategy, and people. It operates through four main businesses — Marsh (risk and insurance broking), Guy Carpenter (reinsurance and capital strategies), Mercer (people and investments), and Oliver Wyman (management consulting). Effective January 2026, the company and its businesses rebranded under the Marsh name, and its NYSE ticker changed from MMC to MRSH.
Industry
Professional services (risk, insurance brokerage, reinsurance, and consulting)
Headquarters
New York City, New York, United States
Company size
More than 95,000 colleagues (over 10,000)
Founded
1871
What we do
Risk and insurance brokingReinsurance and capital strategiesPeople and investments (talent, health, and retirement consulting)Management consulting
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