Leading insurance brokers U.S. 2018, by revenue

With revenue amounting to over seven billion U.S. dollars in 2018, Marsh & McLennan Cos. Inc. topped the list of leading insurance brokers in the country. In that year, they were followed by Aon P.L.C., Willis Towers Watson P.L.C. and Arthur J. Gallagher & Co, in terms of revenue.

Who are Marsh & McLennan?

Marsh & McLennan Companies was officially founded in 1905 in Chicago, Illinois, but its roots date back to 1871 when its predecessor, the Dan H. Bomar Company, was founded. They currently operate in over 130 countries and employ over 65,000 people worldwide. They are also the largest insurance broker globally.

Expansion of their focus

Although the company was traditionally known for its risk and insurance services, they expanded into consultancy work in the 1930s. In 2018, the company was among the top ten diversified financial service companies in the U.S. by revenue. They also ranked second among insurance companies on the London Stock Exchange by market capitalization as of 2019.

Leading insurance brokers in the United States in 2018, by revenue

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Release date

July 2019


United States

Survey time period


Special properties

revenue generated by insurance brokerage and related services

Supplementary notes

Figures have been rounded.

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Statistics on "Insurance industry in the United States"

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