Marsh & McLennan Companies is a global professional services firm providing advice and solutions in the areas of risk, strategy, and human capital. The company operates through four main businesses: Marsh, Guy Carpenter, Mercer, and Oliver Wyman. Marsh & McLennan has a strong market presence and a diverse portfolio of services, which position it well to address the complex needs of its clients. However, the company faces challenges such as regulatory changes, economic fluctuations, and competition from both established firms and new entrants. To maintain its leadership, Marsh & McLennan must continue to innovate and adapt to the changing business environment.