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Arthur J. Gallagher & Co. (AJG) is a financial services company in the coverage sales services industry, based in Rolling Meadows, United States, with about 67,456 full-time employees.
Its largest business segment, Brokerage, brought in 88% of segment revenue in fiscal year 2025; United States was the largest region with 67%. Its market capitalization was $59.65 billion as of October 9, 2026.
Figures from company filings and market data; market data as of October 9, 2026.
Arthur J. , together with its subsidiaries, provides insurance and reinsurance brokerage, consulting, and third-party property/casualty claims settlement and administration services to entities and individuals worldwide. The company operates in Brokerage and Risk Management segments.
Brokerage, with $11.46 billion or 88% of segment revenue in fiscal year 2025. Next: Risk Management (12%).
United States: 67% of revenue by region in fiscal year 2025, followed by United Kingdom (18%).
$59.65 billion as of October 9, 2026.
Listed companies of a similar size in the same industry (coverage sales services) include Aon plc (AON), Willis Towers Watson Public Limited Company (WTW), Brown & Brown, Inc. (BRO), Maase Inc. (MAAS).