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Arthur J. Gallagher & Co. (AJG), headquartered in Rolling Meadows, Illinois, provides insurance and reinsurance brokerage, consulting, and third-party property/casualty claims settlement and administration services. Valued at $63.5 billion by market cap, the company's principal activity is the negotiation and placement of insurance for its clients. Gallagher also specializes in furnishing risk management services.
Shares of this insurance giant have considerably underperformed the broader market over the past year. AJG has declined 16.4% over this time frame, while the broader S&P 500 Index ($SPX) has rallied nearly 10.5%. In 2025, AJG stock is down 12.9%, compared to SPX’s 11.2% rise on a YTD basis.