Regulatory Compliance & Enforcement Risk: Marsh & McLennan operates in highly regulated industries globally, making it susceptible to changes in laws, increased scrutiny, and potential fines or sanctions for non-compliance, impacting its reputation and financial performance.

Cybersecurity & Data Breach Risk: The company handles vast amounts of sensitive client data across its brokerage and consulting operations, making it a prime target for cyberattacks, data breaches, or system failures that could lead to significant financial losses, reputational damage, and legal liabilities.

Economic Downturn & Market Volatility Risk: Marsh & McLennan's revenue is largely tied to economic activity, asset values, and insurance premiums; a global or regional economic recession, interest rate fluctuations, or market volatility could reduce demand for its services and impact client spending.