Marsh & McLennan Companies (MMC) stock: Winston Score and insider trades
Marsh & McLennan is the world's largest insurance broker and risk advisory firm. It helps businesses find the right insurance coverage, manage risks, and plan employee benefits like health insurance and retirement plans. Its main brands include Marsh (insurance brokerage), Guy Carpenter (reinsurance), Mercer (human resources consulting), and Oliver Wyman (management consulting). The company earns revenue primarily through fees and commissions paid by clients for brokerage and consulting services. It operates in over 130 countries and serves businesses of all sizes, from small firms to major global corporations. Its massive scale gives it strong negotiating power with insurers and deep client relationships that are hard for competitors to replicate. Key growth drivers include increasing demand for cyber insurance, climate-related risk advisory, and expansion in emerging markets, though economic slowdowns could reduce corporate spending on consulting and discretionary advisory services.
Winston Score: 59 out of 100, Good
A decent business — some strong pillars, some weaker.
- Quality: Strong (25/30)
- Growth: Mixed (8/20)
- Cash Flow: Exceptional (9/10)
- Stability: Good (5/10)
- Valuation: Good (6/10)
- Ownership: Weak (2/15)
Key Facts
Price: $182.70
Market Cap: $89.8B
Sector: Financial Services
Industry: Insurance - Brokers
Exchange: New York Stock Exchange
Editorial rules set and reviewed by Felix Prehn, Economist and Editor. Figures are refreshed daily from Financial Modeling Prep and company filings; last refreshed 2026-10-15.



