

The US insurance brokerage market exceeds $100 billion in annual revenue. Private equity has turbocharged consolidation across the independent agency space, with 3,000+ acquisitions annually driving unprecedented market concentration. The largest global brokers generate billions in fee and commission income across risk, benefits, and consulting.
Curated by the Top10Grid editorial team. Rankings driven by community votes and updated daily.

$23B in revenue. World's largest insurance broker with 85,000 employees across 130 countries. Oliver Wyman strategy consulting and Mercer HR consulting diversify beyond brokerage. Marsh's specialty practices in cyber, D&O, and political risk are market-defining.

$16B in revenue. London-headquartered with Chicago origins spanning risk, reinsurance, and HR advisory. The $30B attempted merger with Willis Towers Watson was blocked by the DOJ in 2021. Aon United strategy integrates data analytics across all practice areas.

$9.5B in revenue with 45,000 employees across London and Dublin HQs. Employee benefits consulting and human capital analytics differentiate WTW from pure brokers. Risk and broking segment places $100B+ in premium annually for corporate and specialty clients.

$11B in revenue. Rolling Meadows, IL-based broker with one of the most aggressive acquisition strategies in the industry — 200+ acquisitions in 5 years. AJG's culture of decentralized entrepreneurship has made it the acquirer of choice for independent agency owners.

$4B in revenue. Chicago-based broker backed by Hellman & Friedman private equity with 15,000 employees. Hub focuses on middle market commercial and employee benefits. Aggressive acquisition of regional brokers has expanded its US footprint to 600+ locations.

$3.5B in revenue. Kansas City-based largest privately-held US insurance broker with 10,000 employees. Lockton's independence from public markets and PE ownership is a key selling point with clients who value advice over transaction volume. Global reach spans 140+ countries.

$4.5B in revenue. Daytona Beach, FL-based NASDAQ-listed broker (BRO) with a proven acquisition engine. Decentralized "profit center" model holds producers accountable for book profitability. Consistent 20%+ earnings growth over 30 years has rewarded long-term shareholders.

$3B in revenue. New York-based middle market specialist acquired by Aon for $13.4B in 2024. NFP focuses on corporate benefits, wealth management, and P&C for mid-size companies. Integration with Aon's data and analytics platform significantly enhances NFP's capabilities.

$2.5B in revenue. Chicago-based E&S specialty and wholesale broker that IPO'd in 2021. Founded by Pat Ryan (ex-Aon chairman). Ryan Specialty's underwriting management platforms bind $20B+ in specialty and hard-to-place premium annually for retail brokers.

$2B in revenue. Tampa, FL-based PE-backed consolidator rebranded as Onvia in 2024. Focuses on middle market commercial lines and employee benefits. BRP's "Colleague" integration model preserves acquired agency culture while centralizing back-office and technology functions.
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$23B in revenue. World's largest insurance broker with 85,000 employees across 130 countries. Oliver Wyman strategy consulting and Mercer HR consulting diversify beyond brokerage. Marsh's specialty practices in cyber, D&O, and political risk are market-defining.

$16B in revenue. London-headquartered with Chicago origins spanning risk, reinsurance, and HR advisory. The $30B attempted merger with Willis Towers Watson was blocked by the DOJ in 2021. Aon United strategy integrates data analytics across all practice areas.

$9.5B in revenue with 45,000 employees across London and Dublin HQs. Employee benefits consulting and human capital analytics differentiate WTW from pure brokers. Risk and broking segment places $100B+ in premium annually for corporate and specialty clients.

$11B in revenue. Rolling Meadows, IL-based broker with one of the most aggressive acquisition strategies in the industry — 200+ acquisitions in 5 years. AJG's culture of decentralized entrepreneurship has made it the acquirer of choice for independent agency owners.

$4B in revenue. Chicago-based broker backed by Hellman & Friedman private equity with 15,000 employees. Hub focuses on middle market commercial and employee benefits. Aggressive acquisition of regional brokers has expanded its US footprint to 600+ locations.

$3.5B in revenue. Kansas City-based largest privately-held US insurance broker with 10,000 employees. Lockton's independence from public markets and PE ownership is a key selling point with clients who value advice over transaction volume. Global reach spans 140+ countries.

$4.5B in revenue. Daytona Beach, FL-based NASDAQ-listed broker (BRO) with a proven acquisition engine. Decentralized "profit center" model holds producers accountable for book profitability. Consistent 20%+ earnings growth over 30 years has rewarded long-term shareholders.

$3B in revenue. New York-based middle market specialist acquired by Aon for $13.4B in 2024. NFP focuses on corporate benefits, wealth management, and P&C for mid-size companies. Integration with Aon's data and analytics platform significantly enhances NFP's capabilities.

$2.5B in revenue. Chicago-based E&S specialty and wholesale broker that IPO'd in 2021. Founded by Pat Ryan (ex-Aon chairman). Ryan Specialty's underwriting management platforms bind $20B+ in specialty and hard-to-place premium annually for retail brokers.

$2B in revenue. Tampa, FL-based PE-backed consolidator rebranded as Onvia in 2024. Focuses on middle market commercial lines and employee benefits. BRP's "Colleague" integration model preserves acquired agency culture while centralizing back-office and technology functions.
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