Arthur J. Gallagher & Co. (often referred to as Gallagher) is a global insurance brokerage, risk management, and consulting firm headquartered in Rolling Meadows, Illinois. Founded in 1927 by Arthur J. Gallagher, the company went public on the New York Stock Exchange in 1984 under the ticker AJG. As of May 2026, Arthur J. Gallagher & Co. has a market capitalization of approximately $52-54 billion USD. The firm employs around 72,000 people globally and generated an estimated annual revenue of $14.3 billion.
Gallagher's primary services include insurance brokerage for property/casualty and reinsurance, risk management services, and consulting. Their risk management offerings encompass claims management, loss control consulting, and alternative risk transfer. The consulting arm provides services in areas such as employee benefits, human resources, compensation, compliance, and diversity, equity, and inclusion.
Arthur J. Gallagher & Co. appears to operate as an operating company defending its business, as indicated by its patent litigation posture. The company has been named as a defendant in all 2 of its tracked U.S. patent litigation cases and has no plaintiff cases. Both tracked cases against Arthur J. Gallagher & Co. were filed in the U.S. District Court for the District of Delaware.
The notable cases in which Arthur J. Gallagher & Co. has been a defendant are Midwest Energy Emissions Corp. et al. v. Arthur J. Gallagher & Co. et al. (filed 2019-07-17) and Midwest Energy Emissions Corp. v. Arthur J. Gallagher & Co. (filed 2019).