What does marsh insurance company do? The company brokers insurance and provides risk management and consulting services to corporate clients, government agencies, and other organizations big and small. Marsh has some 34,000 agents and hundreds of brokerage locations in more than 130 countries. The company makes about 55% of its revenue in North America.What is marshmarsh usa? Marsh USA (Marsh) is the flagship operation of Marsh & McLennan Companies (MMC), one of the world's largest insurance brokerages. The company brokers insurance and provides risk management and consulting services to corporate clients, government agencies, and other organizations big and small.How do i get in contact with my marsh client executive? If you are an existing Marsh client, we encourage you to get in touch directly with your allocated Marsh Client Executive, whose details will appear on your account paperwork. Trouble logging in? Clients and registered users, please contact Marsh Portal Support.How do i locate a marsh office in my area? To locate a Marsh office, please click the following link. Please let us know if you have a question, want to leave a comment, or would like further information about Marsh. If you are an existing Marsh client, we encourage you to get in touch directly with your allocated Marsh Client Executive, whose details will appear on your account paperwork.