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Marsh keeps top spot among global insurance brokers as revenues rise
Marsh lifted 2025 revenue by more than $2 billion to nearly $27 billion, widening its lead in AM Best’s global broker ranking.
Marsh remained the world’s largest insurance broker in AM Best’s latest annual ranking, citing 2025 revenue of almost $27 billion. Reinsurance News reports that Marsh grew revenue by more than $2 billion during 2025 and kept its top position in the global broker market.
AM Best’s ranking was based on 2025 total revenue, with Aon in second place, Arthur J. Gallagher & Co. third, and WTW fourth. All four firms retained the same positions as the prior year, according to the outlet.
Brown & Brown recorded the biggest movement within the top five, rising two spots to fifth after increasing revenue by more than $1 billion to $5.90 billion. Reinsurance News links the jump to Brown & Brown’s acquisition of the holding company of Accession Risk Management Group, described by the firm as its largest acquisition.
Other changes included Alliant Insurance Services moving to sixth despite revenue rising to $5.8 billion, Hub International ranking seventh after reaching $5.28 billion, Howden advancing to eighth on $4.84 billion, and Acrisure placing ninth with $4.82 billion. Diot-Siaci entered the top 20 for the first time at No. 19 with revenues of $1.48 billion, the outlet said.