Marsh, a global insurance brokerage and risk advisory firm, remains the world’s largest insurance broker, with 2025 revenues of almost $27bn, according to data from rating agency AM Best.AM Best’s annual ranking, based on 2025 total revenue, highlights continued growth among the world’s largest insurance brokers. You can view our Top Global Insurance Brokers table here.The agency said: “Consistency was the theme in this year’s list as Marsh captured the top spot for the 16th consecutive year.”Marsh increase ...