Marsh & McLennan Companies, Inc. is a leading global professional services firm specializing in risk management, insurance broking, reinsurance, and consulting. The company provides strategic advice a... Marsh & McLennan Companies, Inc. is a leading global professional services firm specializing in risk management, insurance broking, reinsurance, and consulting. The company provides strategic advice and solutions that help organizations manage risk, optimize operations, and enhance workforce effectiveness. Its core operations span two main segments: Risk & Insurance Services, which includes Marsh’s insurance broking and Guy Carpenter’s reinsurance expertise, and Consulting, delivered through Mercer and Oliver Wyman, offering services in health, wealth, and career management, as well as strategic advisory and organizational transformation. Marsh & McLennan is recognized for its significant role in addressing complex business risks and facilitating effective decision-making for clients worldwide. In 2025, it reported robust revenue growth driven by solid performance across all divisions and continued momentum from strategic acquisitions. The firm serves a diverse client base across industries and geographies, underpinning its market significance as a trusted partner in helping organizations navigate evolving risk and regulatory landscapes.