Marsh & McLennan Companies, Inc.

Marsh & McLennan Companies, Inc. (since January 2026, branded simply as Marsh) is the world's largest insurance brokerage and a global professional services firm operating across risk advisory, reinsurance intermediation, human capital consulting, and management consulting, generating $27.0 billion in revenue in fiscal 2025. With approximately 95,000 employees in 130 countries, the company occupies a position in the global insurance and consulting ecosystem that is difficult to replicate — it is the market leader in insurance broking (Marsh Risk), reinsurance intermediation (Guy Carpenter), and health-and-wealth consulting (Mercer), and houses a top-tier strategy consultancy (Marsh Management Consulting, formerly Oliver Wyman Group) under the same roof.

This is a compounding story wrapped in a cyclical wrapper. Marsh's core business — advising clients on risk and placing insurance — generates consistent mid-single-digit organic growth through a combination of exposure-unit expansion, new business wins, and modest rate tailwinds over a full cycle. But the company also carries a large reinsurance brokerage (Guy Carpenter) whose revenue is mechanically levered to reinsurance pricing, which turned sharply negative in 2025-2026, and a consulting segment whose growth can accelerate or decelerate with corporate spending cycles. The central question the file turns on is whether the structural growth drivers — expanding risk complexity, middle-market penetration, AI-driven consulting demand — can sustain the compounding trajectory through what looks like a multi-year soft insurance pricing cycle, and whether the capital allocation playbook of buybacks, dividends, and bolt-on M&A continues to create per-share value at the current valuation.

Marsh is not a turnaround and not a disruptor. It is the incumbent beneficiary of a world that keeps getting riskier. The debate is about price — the price of insurance (headwind) and the price of the stock (the multiple).