What are the top 10 insurance brokers in the USA?

The big three insurance brokers globally, ranked by annual revenue, are Marsh McLennan, Aon, and Arthur J. Gallagher & Co.

The Big Three Overview

• Marsh McLennan
  • Revenue: ~$25.3 billion
  • Headquarters: New York, USA
  • Details: The largest insurance brokerage and risk management firm in the world. It operates globally across commercial property, casualty, reinsurance, and consulting.
• Aon plc
  • Revenue: ~$15.4 billion
  • Headquarters: London, UK
  • Details: The second-largest global broker. It specializes in risk management, insurance and reinsurance brokerage, and human resource consulting.
• Arthur J. Gallagher & Co.
  • Revenue: ~$11.1 billion
  • Headquarters: Rolling Meadows, Illinois, USA
  • Details: Rose to become the third-largest global broker following major strategic acquisitions. It provides global insurance brokerage, consulting, and risk placement services.

(Note: Historically, Willis Towers Watson (WTW) was part of the traditional "Big Three" oligopoly, but Arthur J. Gallagher surpassed it in total revenue to claim the third spot.)

The top insurance brokers in the U.S. are ranked annually by trade publications like Business Insurance based on prior-year brokerage revenues.

The Top U.S. Insurance Brokers

The largest firms dominating the top of the Business Insurance Largest Brokers PDF and industry rankings include:

• Marsh McLennan (Ranked #1)
• Arthur J. Gallagher & Co. (Ranked #2)
• Aon PLC (Ranked #3)
• Alliant Insurance Services Inc. (Ranked #4, and the top privately owned broker)
• Brown & Brown, Inc. (Ranked #5)
• Other major national and global leaders rounding out the top tier include Hub International, Lockton Companies, USI Insurance Services, CBIZ, and Acrisure.

Because the complete, shifting list of all 100 firms contains dozens of privately held and frequently acquired middle-market agencies, publishers update the precise 1–100 roster annually as mergers and acquisitions occur. You can explore voluntary retail submissions and specific independent property/casualty rankings via the Insurance Journal Top 100 Agencies.

The largest insurance brokers in the world, ranked by annual revenue, are Marsh McLennan, Aon, and Arthur J. Gallagher & Co.

Top Global Insurance Brokers

• Marsh McLennan: Generates roughly $25 billion to $27 billion in revenue and leads the global market in risk management, reinsurance, and insurance brokerage.
• Aon: Generates about $15 billion to $17 billion in revenue, providing commercial risk, health, and retirement solutions.
• Arthur J. Gallagher & Co.: Produces over $11 billion to $13 billion in annual revenue, expanding rapidly through major acquisitions.
• Willis Towers Watson (WTW): Collects about $9.7 billion in revenue, specializing in advisory, broking, and solutions.
• Brown & Brown: Earns nearly $6 billion to $6.8 billion in revenue, serving a wide range of commercial and professional clients.

Other Major U.S. and Independent Firms

• Alliant Insurance Services: A major U.S. independent firm with around $5 billion in revenue.
• Hub International: A large North American insurance brokerage with roughly $4.8 billion in revenue.
• Acrisure: A fast-growing financial services and insurance brokerage firm near $4 billion in revenue.
• Lockton Companies: The world's largest privately held independent insurance broker, with about $3.9 billion to $4.4 billion in revenue.

The 10 best and largest property, casualty, and auto insurance companies in the USA, based on market share, consumer satisfaction, and financial strength, are:

• State Farm: The largest property, casualty, and auto insurer in the U.S., known for its massive network of local, dedicated agents and strong usage-based savings programs.
• Progressive: A top national carrier widely praised for its competitive pricing, high-tech self-service mobile tools, and extensive coverage customization.
• USAA: Consistently ranked highest for customer satisfaction, offering low rates exclusively to military members, veterans, and their families.
• GEICO: A dominant auto insurer known for highly affordable rates and deep discount opportunities for safe drivers and federal employees.
• Allstate: A major national provider offering robust local agent support, comprehensive coverage, and app-based safe driving rewards.
• Liberty Mutual: One of the largest property and casualty insurers globally, offering extensive multi-policy bundles and group insurance programs.
• Travelers: A leading national carrier recognized for strong underwriting stability, great budget-friendly rates, and low complaint ratios.
• Farmers Insurance: A widespread national insurer known for versatile policy add-ons and numerous multi-line discount options.
• Nationwide: A top-tier provider offering flexible coverage choices, strong financial backing, and customizable options like accident forgiveness.
• American Family Insurance: A prominent regional-to-national carrier recognized for strong customer service marks and low consumer complaint indexes.

Commercial property and casualty (P&C) and high-net-worth specialty insurance brokers make the most money.

High-Earning Broker Specialties

• Commercial P&C Brokers: Sell large business policies, corporate coverage, and specialized liability. They handle massive multi-million dollar premiums, which yield huge commission checks.
• Group Health and Benefits Consultants: Use a Per Member Per Month (PMPM) model. This creates ongoing monthly residual income from large corporate employee pools.
• Surety Bond Producers: Work on large municipal or civil construction projects. They can earn massive individual commissions because agency payouts reach 35% to 40%.
• High-Net-Worth Personal Lines Brokers: Focus on wealthy individuals with expensive homes, cars, and yachts, resulting in much larger policy values than standard home or auto insurance.

Why These Specialties Pay More

• Larger Premiums: Higher asset values mean larger total policy costs and bigger percentage cuts for the broker.
• Residual Commissions: Corporate accounts renew every year, providing steady, passive income streams.
• Complex Needs: Businesses and wealthy clients require tailored risk advice, allowing brokers to charge high consulting and brokerage fees.

Learn more about compensation structures in the Jonus Group Career Rankings.