Arthur J. Gallagher

The Gallagher family maintains significant leadership control despite the firm being publicly traded. J. Patrick Gallagher Jr. serves as Chairman and CEO, his brother Thomas J. Gallagher is President, and his son Patrick M. Gallagher is Chief Operating Officer. This represents three generations of family leadership at the top of the firm.

Gallagher grows through a hybrid model of organic sales expansion and frequent acquisitions. The firm typically closes dozens of smaller tuck-in acquisitions each year to add niche expertise or new geographic capabilities, rather than relying on large transformative mergers. This strategy has allowed it to scale consistently while maintaining its cultural identity.

Arthur J. Gallagher is a publicly traded insurance brokerage, risk management, and consulting firm — not a family office. However, its governance structure is unusual for a company of its size, with the founding Gallagher family still holding key C-suite positions across three generations. The family's separate philanthropic activities flow through the Arthur J. Gallagher Foundation.

Gallagher operates globally with a significant presence in the United States, the United Kingdom, Canada, Australia, and New Zealand. Its UK headquarters is located at 67 Lombard Street in London's insurance district. The firm serves clients across virtually every industry sector through its retail brokerage, wholesale, and reinsurance divisions.

Public records show the firm operates a subsidiary named AJG Investments, Inc. based in Rolling Meadows, Illinois. Beyond this, the family's personal wealth management and family office structures, if any exist beyond their public equity holdings, have not been publicly detailed.