Marsh & McLennan Companies (NYSE: MMC) is a global professional services firm offering advice and solutions in the areas of risk, strategy and human capital. Established in 1905 and headquartered in New York City, MMC operates through four principal business segments: Marsh, Guy Carpenter, Mercer and Oliver Wyman. Each segment delivers specialized services including insurance broking and risk management, reinsurance advisory, talent and human capital consulting, as well as management and strategic consulting for a diverse array of industries.
Marsh, the firm’s risk and insurance services arm, provides clients with insurance broking, risk management and claims advocacy. Guy Carpenter specializes in reinsurance broking and risk transfer strategies, helping insurers and corporate clients optimize capital and mitigate exposures. Mercer delivers a broad suite of human resources consulting services covering health, wealth and career solutions, while Oliver Wyman offers management consulting, data analytics and specialized risk advisory across financial services, energy, transport and other sectors.
With operations in more than 130 countries, MMC serves governments, multinational corporations, small and mid-sized businesses and non-profit organizations. Its global network of professionals leverages local market expertise alongside cross-disciplinary capabilities, enabling tailored solutions for complex regulatory environments, emerging risks and evolving workforce needs. This international footprint has supported an enduring presence in any market where clients require integrated risk and consulting services.
Throughout its history, Marsh & McLennan Companies has balanced organic growth with strategic acquisitions and alliances to expand its capabilities. The firm’s leadership team, led by Chief Executive Officer John Doyle, emphasizes innovation in data analytics, digital platforms and sustainable risk solutions. MMC continues to invest in talent development and technology, reinforcing its commitment to helping clients anticipate challenges, seize opportunities and achieve long-term resilience.
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