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 ***Â 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 ÌÇÐÄÆƽâ°æ. Retrieved July 29, 2026, from /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. ÌÇÐÄÆƽâ°æ. Accessed July 29, 2026. /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). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 29, 2026. /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)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 1 Jan 2026, /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) ÌÇÐÄÆƽâ°æ, /statistics/1258626/leading-insurance-brokers-revenue-usa/ (last visited July 29, 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: /statistics/1258626/leading-insurance-brokers-revenue-usa/
