Based on 2024 brokerage revenues from U.S. clients, the largest insurance broker in the United States is Marsh & McLennan Cos. Inc. At this time, the New York-based professional services firm reported revenues from U.S. insurance broking of around ***** billion U.S. dollars. The next largest insurance broker in the U.S. market - Aon - is a UK-based company with *** billion U.S. dollars in brokerage revenue from the U.S. market. Additionally, Arthur J. Gallagher & Co. has reported revenues of *** billion U.S. dollars, making it a significant player in the market.
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Business Insurance. (January 1, 2026). Leading insurance brokers in the United States from 2020 to 2024, by brokerage revenue (in billion U.S. dollars) [Graph]. In Statista. Retrieved May 09, 2026, from https://www.statista.com/statistics/1258626/leading-insurance-brokers-revenue-usa/
Business Insurance. "Leading insurance brokers in the United States from 2020 to 2024, by brokerage revenue (in billion U.S. dollars)." Chart. January 1, 2026. Statista. Accessed May 09, 2026. https://www.statista.com/statistics/1258626/leading-insurance-brokers-revenue-usa/
Business Insurance. (2026). Leading insurance brokers in the United States from 2020 to 2024, by brokerage revenue (in billion U.S. dollars). Statista. Statista Inc.. Accessed: May 09, 2026. https://www.statista.com/statistics/1258626/leading-insurance-brokers-revenue-usa/
Business Insurance. "Leading Insurance Brokers in The United States from 2020 to 2024, by Brokerage Revenue (in Billion U.S. Dollars)." Statista, Statista Inc., 1 Jan 2026, https://www.statista.com/statistics/1258626/leading-insurance-brokers-revenue-usa/
Business Insurance, Leading insurance brokers in the United States from 2020 to 2024, by brokerage revenue (in billion U.S. dollars) Statista, https://www.statista.com/statistics/1258626/leading-insurance-brokers-revenue-usa/ (last visited May 09, 2026)
Leading insurance brokers in the United States from 2020 to 2024, by brokerage revenue (in billion U.S. dollars) [Graph], Business Insurance, January 1, 2026. [Online]. Available: https://www.statista.com/statistics/1258626/leading-insurance-brokers-revenue-usa/
