Arthur J. Gallagher & Co. (AJG)

Arthur J. Gallagher & Co. (NYSE: AJG), founded in 1927 and reincorporated in Delaware in 1972, is a global provider of insurance brokerage, reinsurance brokerage, consulting, and third-party property/casualty claims settlement and administration services, headquartered in Rolling Meadows, Illinois. The company operates through three reportable segments: brokerage (85% of 2022 revenue), risk management (14%), and corporate (1%). Gallagher does not assume underwriting risk beyond de minimis regulatory capital needs, instead relying on external "underwriting enterprises" to bear loss coverage.

As of 2022, it ranked as the world's fourth-largest insurance broker by revenue and third-largest by market capitalization (~$40.0 billion at year-end), with approximately 65% of brokerage and risk management revenue generated in the U.S. and 35% internationally, primarily in the U.K., Australia, Canada, and New Zealand. The brokerage segment includes domestic retail operations (73% of segment revenue), organized around specialized niche/practice groups such as real estate/hospitality, financial institutions, and trade credit/political risk; global reinsurance brokerage (12%), operating as Gallagher Re following the 2021 acquisition of Willis Re, ranked the third-largest reinsurance broker worldwide; and wholesale brokerage (15%), serving as an intermediary or managing general agent for specialized and hard-to-place insurance. The risk management segment provides third-party claims administration, primarily for workers' compensation (62%), general/commercial auto liability (31%), and property claims (7%), with 91% of revenue from clients unaffiliated with its brokerage business.

The corporate segment generates revenue mainly from clean energy investments, including a 46.5% controlling stake in Chem-Mod LLC (emissions-reduction technology) and a 12% noncontrolling interest in the dormant C-Quest carbon-reduction ventures; tax credit generation under IRC Section 45 ended in December 2021. Gallagher has completed over 650 acquisitions since 2002, primarily smaller regional brokerages and consulting firms, as a core growth strategy alongside niche expansion and cross-selling. The company employed approximately 44,000 people globally as of year-end 2022 (45% in the U.S., 55% internationally), with 75% in brokerage and 19% in risk management; workforce diversity metrics show 58% women overall and 26% racially/ethnically diverse employees in the U.S. Gallagher operates in a highly competitive, heavily regulated global industry, subject to oversight from bodies such as the SEC, FTC, FINRA, DOJ, and international regulators including the U.K. Financial Conduct Authority and Australian Securities and Investments Commission, and faces increasing compliance obligations related to data privacy, anti-corruption laws, and emerging climate-related disclosure frameworks such as the EU's Corporate Sustainability Reporting Directive.