Marsh & McLennan Companies, Inc.

About Marsh & McLennan Companies, Inc.

Marsh & McLennan Companies, Inc. is a publicly traded professional services company headquartered in New York City. It now uses the single brand name Marsh, following a brand change effective January 2026 that the company describes as a change to brand strategy rather than business structure. Its businesses cover insurance brokerage, risk management, reinsurance services, talent management, investment advisory and management consulting, and its four named businesses are Marsh, Guy Carpenter, Mercer and Oliver Wyman.

Its work is organized around risk and insurance, reinsurance and capital, people and investments, and management consulting, and it reports advising clients in 130 countries. The corporate headquarters is at 1166 Avenue of the Americas in New York City. Its Marsh McLennan Agency business also lists offices in New York State, including New York City and Melville.

Practice areas

Areas of work that Marsh & McLennan Companies, Inc. describes on its own website. They describe the organization as a whole, not the practice of any individual attorney listed below.

Organization profile based on its official website and public sources (reviewed October 29, 2026). Attorney list from the New York State Unified Court System registration data. Not affiliated with Marsh & McLennan Companies, Inc..

Registered attorneys

Registration status can change at any time. Confirm any attorney's current status through the official New York Attorney Search.