Marsh McLennan is a global professional services firm working across risk management, reinsurance and capital, people and investments, and management consulting. Its technical work spans cyber risk and climate risk modelling, alongside advisory on human capital, operational optimisation and performance. The firm reports more than 90,000 colleagues operating in 130 countries, with annual revenue exceeding $24 billion.
The company was founded in 1871 and conducts its business through four units: Marsh, which delivers insurance broking and risk expertise; Guy Carpenter, which covers reinsurance and capital; Mercer, which focuses on people and investments; and Oliver Wyman, which provides management consulting. Together these businesses apply an integrated, cross-disciplinary approach, connecting insights across fields to help clients anticipate and navigate risk and complexity.
Marsh McLennan's stated purpose is "to build the confidence to thrive through the power of perspective". The firm undertakes thought leadership on climate resilience, the future of work and operational optimisation, and maintains partnerships with Bloomberg and the World Economic Forum, including engagement at Davos.
