Marsh & McLennan Companies (NYSE: MMC) is a global professional services firm headquartered in New York City that provides advice and solutions in the areas of risk, strategy and people. Founded in 1905, the company has grown into a diversified group of businesses focused on insurance brokerage and risk management, reinsurance, human capital and investment consulting, and management consulting. Its long history and scale position it as a prominent adviser to corporations, governments and other institutions seeking to manage risk and optimize human and financial capital.
The firm operates through several well-known subsidiaries and business units that specialize in distinct services. Marsh provides commercial insurance broking and risk management services; Guy Carpenter offers reinsurance and capital solutions; Mercer delivers talent, health, retirement and investment consulting; and Oliver Wyman provides management and economic consulting across industries. Together these businesses offer a mix of brokerage, advisory and analytic services, including policy placement, catastrophe modeling, actuarial analysis, workforce strategy, pension and investment consulting, and corporate strategy work.
Marsh & McLennan serves clients across a broad range of industries and geographies, maintaining a global presence in North America, Europe, Asia-Pacific, Latin America and other markets. Its client base includes multinational corporations, mid-sized companies, public-sector entities and institutional investors. The firm emphasizes industry-specific expertise and integrated solutions that combine risk transfer, reinsurance, people advisory and strategic consulting to address complex, cross-border challenges.
Governed by a board of directors and an executive leadership team, Marsh & McLennan emphasizes innovation in analytics, data and advisory capabilities to enhance client outcomes. The company regularly invests in technology and intellectual capital to support underwriting, risk assessment and human capital services, positioning itself as a provider of advisory-driven solutions rather than standalone transactional products.
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