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Marsh & McLennan Companies, Inc. (MRSH) is a listed company, based in New York, United States, with about 95,000 full-time employees.
Its largest business segment, Marsh Insurance Group, brought in 72% of segment revenue in fiscal year 2025; UNITED STATES was the largest region with 49%. Its market capitalization was $83.87 billion as of October 9, 2026.
Figures from company filings and market data; market data as of October 9, 2026.
, a professional services company, provides advisory services and insurance solutions to clients in the areas of risk, strategy, and people worldwide. The company operates through Risk and Insurance Services, and Consulting segments.
Marsh Insurance Group, with $31.49 billion or 72% of segment revenue in fiscal year 2025. Next: Mercer Consulting Group (14%) and Oliver Wyman Group Consulting Group (8%).
UNITED STATES: 49% of revenue by region in fiscal year 2025, followed by Other Geographic Areas (37%).
$83.87 billion as of October 9, 2026.