Arthur J. Gallagher & Co.

What is Arthur J. Gallagher & Co.?
Arthur J. Gallagher & Co. is a global insurance brokerage and risk management company headquartered in Rolling Meadows, Illinois. Founded in 1927, it is the world's third-largest insurance broker, reporting FY2025 revenue of $13.8 billion.

Is Arthur J. Gallagher publicly traded?
Yes. It trades on the New York Stock Exchange under the ticker AJG.

Who runs Arthur J. Gallagher?
J. Patrick Gallagher Jr., grandson of the founder, serves as chairman, president, and chief executive officer.

What did Gallagher pay for AssuredPartners?
Gallagher closed the acquisition of AssuredPartners on August 18, 2025 for approximately $13.8 billion, its largest deal ever, adding about 10,900 employees.

What are Gallagher's business segments?
Brokerage, covering retail and wholesale broking plus Gallagher Re reinsurance, and Risk Management, built around the Gallagher Bassett claims administration business.

Arthur J. Gallagher founded the brokerage in Chicago in 1927 as a one-man insurance agency. His three sons, John, James, and Robert, joined after World War II and expanded the firm into commercial lines and employee benefits. The company incorporated in 1950 and listed on the New York Stock Exchange in 1984.

Through the 1990s and 2000s Gallagher grew into one of the largest US brokers by acquiring hundreds of regional agencies, a roll-up strategy that continued under J. Patrick Gallagher Jr., who joined in 1974 and became president in 1985 and CEO in 1995. Major capability deals included UK broker Heath Lambert in 2011, claims administrator Gallagher Bassett's global expansion, and Willis Re's reinsurance brokerage in 2021 for $3.25 billion upfront, which created the Gallagher Re brand.

In December 2024 Gallagher announced its largest deal ever: AssuredPartners, a US retail broker owned by GTCR, for approximately $13.45 billion. Funded by an $8.5 billion equity offering and $5 billion in senior notes, the acquisition closed on August 18, 2025 and added roughly 10,900 employees.

FY2025 revenue reached $13.8 billion, up 20.8% over 2024, with 6% organic growth. Net earnings were $1.5 billion and adjusted EBITDAC was $3.68 billion.

As a broker, Gallagher sits in the conflict-of-interest debate over contingent commissions, a long-running industry scrutiny point where regulators question whether placement incentives align with client interests. The company discloses such compensation and frames it within carrier relationships.

The size and price of the AssuredPartners transaction drew investor attention on leverage and integration risk, and litigation has historically surfaced around non-compete enforcement when brokers move between firms, a standard industry friction.