The undisputed world's largest insurance brokerage and risk management firm is Marsh & McLennan Companies (Marsh), leading the global industry by total brokerage revenues. Operating across multiple specialized subsidiaries—including Marsh for insurance broking, Guy Carpenter for reinsurance, Mercer for human resources consulting, and Oliver Wyman for management consulting—the corporation generates tens of billions of dollars annually, dominating the international commercial risk advisory and brokerage landscape through continuous strategic acquisitions and technological innovations.