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Company Overview
About Arthur J. Gallagher & Co.
Arthur J. Gallagher & Co. is a Rolling Meadows, Illinois-based global insurance brokerage and risk management company — publicly traded on the New York Stock Exchange (NYSE: AJG) as an S&P 500 Financials component — providing commercial property/casualty insurance brokerage, employee benefits consulting, and risk management services to businesses and organizations worldwide through approximately 58,000 employees following the completion of the AssuredPartners acquisition. The defining transaction of 2025 was Arthur J. Gallagher's closing of the $13.45 billion acquisition of AssuredPartners — the largest sale of a US insurance broker to a strategic acquirer in industry history — adding 10,900 employees, approximately $2.9 billion in pro forma revenues, and 400 offices across the United States, United Kingdom, and Ireland, with particular middle-market strength in transportation, energy, healthcare, and government contracting. The AssuredPartners combination accelerates Gallagher's position as the third-largest insurance broker globally (behind Marsh & McLennan and Aon), with combined annual revenues exceeding $14 billion. CEO J. Patrick Gallagher Jr. has led the company's strategy of organic growth supplemented by a relentless acquisition program of regional and specialty insurance brokers — Gallagher has completed 40-50+ acquisitions per year in recent years — building a national and international distribution network that can cross-sell specialty insurance products across AssuredPartners' 400 acquired office locations. Gallagher's Risk Management Services division (claims adjusting and administration for self-insured corporations and government entities) provides a second business line that diversifies revenue from insurance brokerage commission and fee income.
Business Model & Competitive Advantage
Arthur J. Gallagher's insurance brokerage model creates value through the combination of carrier market access (negotiating policy terms and pricing with 300+ insurance carriers on behalf of clients) and claims advocacy (representing the client in coverage disputes and claims settlement negotiations): a middle-market manufacturer insuring a $50 million commercial property with $10 million general liability needs a broker who understands industrial property valuation, knows which carriers offer competitive coverage for chemical storage risks, and can negotiate business interruption coverage terms — Gallagher's specialty expertise in manufacturing and industrial risks creates differentiated advisory value versus a generalist broker placing the account with the cheapest carrier. The serial acquisition strategy builds coverage in every US metropolitan market and dozens of international markets, enabling Gallagher to serve national clients who need consistent brokerage capabilities in 50 US cities without managing 50 independent regional broker relationships.
Competitive Landscape 2025–2026
In 2025, Arthur J. Gallagher competes in global insurance brokerage and risk management against Marsh & McLennan Companies (NYSE: MMC, $24.4B 2024 revenue, Marsh, Guy Carpenter, Mercer), Aon plc (NYSE: AON, $15.7B revenue, reinsurance and risk advisory), and Willis Towers Watson (NASDAQ: WTW, $9.6B revenue, brokerage and HR consulting) for corporate and middle-market insurance placement, specialty risk programs, and employee benefits consulting. The AssuredPartners acquisition dramatically expands Gallagher's middle-market presence — where AssuredPartners had built strong local relationships in markets where Marsh and Aon focus on larger enterprise clients — creating the scale to compete for middle-market insurance placements across the entire US geography. The insurance market hardening (commercial property premiums increasing 15-25% in catastrophe-exposed markets) creates favorable brokerage commission conditions as premiums on which Gallagher earns percentage-based commissions increase. The 2025 strategy focuses on AssuredPartners integration (retaining key producers and clients through the ownership transition), organic growth through new client acquisition, and continued specialty insurance broker acquisitions in transportation, healthcare, and construction niches.
The Arthur J. Gallagher & Co. Story
Founders
Recent Activity
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Major milestones in Arthur J. Gallagher & Co.'s journey
Leadership Team
Meet the leaders behind Arthur J. Gallagher & Co.
J. Patrick Gallagher Jr.
J. Patrick Gallagher Jr. has served as CEO since January 1995 and Chairman since 2006, with a tenure exceeding 30 years. He served as President from 1990 to 2024. Under his leadership, Gallagher has grown from a regional broker to the third-largest global insurance broker through strategic acquisitions and organic growth, including the landmark $13.45 billion AssuredPartners acquisition in 2025.
Douglas K. Howell
Douglas K. Howell joined Gallagher in 2003 as Chief Financial Officer and oversees financial, investment, information technology, and administrative functions. He represents Gallagher in dealings with global investment analysts, institutional shareholders, and prospective investors. His leadership has guided the company through significant growth and major acquisitions.
Thomas J. Gallagher
Thomas J. Gallagher serves as an Executive Vice President, continuing the family legacy in company leadership. He plays a key role in strategic initiatives and maintains the values and culture established by founder Arthur J. Gallagher.
Christopher E. Mead
Christopher E. Mead has served as Chief Marketing Officer since 2017, leading global marketing strategy, brand development, and client engagement initiatives across Gallagher's international operations in over 130 countries.
Key Differentiators
Market Leader
Arthur J. Gallagher & Co. is recognized as a market leader in the Consumer Finance sector, demonstrating strong industry presence and customer trust.
Frequently Asked Questions
Estimated Visibility Trend (Beta)
Simulated 8-week rolling score
Based on estimated brand signals. Historical tracking coming soon.
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