Arthur J. Gallagher & Co.

Arthur J. Gallagher & Co., commonly known as Gallagher, is a global insurance brokerage, risk management, and consulting services firm. Founded in 1927 by Arthur J. Gallagher in Chicago, Illinois, the company's mission is to provide superior, cost-effective risk management products and services, foster strong relationships with insurance markets, enhance shareholder value, and offer professional growth opportunities for its employees. Its global headquarters are located in Rolling Meadows, Illinois, U.S..

The company's core services span insurance brokerage, including property and casualty, life and health, and various specialty lines, as well as reinsurance brokerage through its Gallagher Re subsidiary. Additionally, Gallagher provides comprehensive risk management and claims services via Gallagher Bassett Services, and employee benefits consulting through Gallagher Benefit Services. These offerings cater to a diverse clientele, including commercial, industrial, public, religious, and nonprofit entities, as well as individuals, across approximately 130 countries worldwide..

Led by Chairman and CEO J. Patrick Gallagher Jr., with Thomas J. Gallagher as President and Patrick M. Gallagher as COO, Arthur J. Gallagher & Co. is a publicly traded company listed on the New York Stock Exchange under the ticker symbol AJG and is a component of the S&P 500 index. The firm maintains an active acquisition strategy, with recent notable transactions including the acquisitions of Twin Elms, LLC, Mays Brown Solicitors, and McKee Risk Management, Inc. in May 2026. In October 2025, the company also acquired Meadowbrook Insurance Agency and AssuredPartners for $13.45 billion. Gallagher emphasizes the deployment of artificial intelligence to enhance productivity and retention within its operations..