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Top Global Insurance Brokers of 2025: Marsh McLennan Remains Unbeatable
In the dynamic world of insurance and reinsurance, the top players continue to dominate the market. According to a report by AM Best, published in their monthly magazine Best's Review, the global insurance brokers with the highest total revenue in 2024 are as follows:
- Marsh McLennan: With a staggering $24.46 billion in revenue, Marsh McLennan has once again claimed the top spot, marking the 15th consecutive year at the helm. This impressive figure represents an increase of $1.72 billion from the previous year.
- Aon: Aon maintains its second place position with $15.7 billion in revenue, a figure it has held for 15 years running.
- Arthur J. Gallagher & Co.: With $11.30 billion in revenue, this company holds onto its top-four position.
- Willis Towers Watson (WTW): WTW also remains in the top four with $9.93 billion in revenue.
- Alliant Insurance Services: Notably, Alliant Insurance Services has jumped from 8th to 5th place with $5.07 billion in revenue.
The remaining spots in the top 20 are occupied by Hub International ($4.81 billion), The Ardonagh Group ($2.53 billion), CRC Group ($2.46 billion), and new entrants BroadStreet Partners, Accession Risk Management Group, Alera Group, The Baldwin Group, and Digital Insurance (OneDigital).
This ranking is based on comprehensive data compiled by AM Best and reported in July 2025, reflecting total global revenues for 2024 by insurance and reinsurance brokers. The top companies have shown consistent strength and incremental growth in this highly competitive market. It is worth noting that U.S. brokerage revenues in 2024 also align with this, with Marsh McLennan topping that list as well, further confirming its leadership globally.
AM Best is a global credit rating agency, news publisher, and data analytics provider specializing in the insurance industry. They do business in over 100 countries with regional offices in London, Amsterdam, Dubai, Hong Kong, Singapore, and Mexico City. For more information about AM Best, visit www.ambest.com.
Patricia Vowinkel, the Executive Editor of Best's Review, can be reached at phone number 1 908 882 1771 or via email at [email protected].
For those interested in the latest developments in the insurance industry, the "Top Global Insurance Brokers - 2025 Edition" provides a comprehensive ranking of the top 20 global insurance brokers based on 2024 total revenue. Copyright for the content belongs to A.M. Best Company, Inc. and/or its affiliates.
1) In the insurance industry, AM Best's report published in July 2025 reveals that Marsh McLennan, with its $24.46 billion revenue, continues to lead the global brokers in finance and business, maintaining a 15-year streak in the top spot.
2) Aon, with $15.7 billion in revenue, has held the second place position in the banking and insurance sector for 15 consecutive years, according to the Top Global Insurance Brokers - 2025 Edition report by AM Best.
3) The cloud of competition hasn't dampened the growth of Arthur J. Gallagher & Co., as it retains its top-four position in the insurance business with a revenue of $11.30 billion.
