Top 10 Largest Insurance Brokers in the World

Insurance brokering is a critical part of the global financial services industry. Brokers act as intermediaries between clients and insurance companies, advising on risk, structuring coverage, and negotiating terms. Here are the ten largest insurance brokers globally, based on recent revenue figures and market influence.

1. Marsh & McLennan (MMC)

Marsh & McLennan is the undisputed leader in the global broking arena. With its diverse portfolio—spanning risk consulting, reinsurance broking, human capital consulting (Mercer), and more—MMC generated around US$24.46 billion in revenue in 2024. Beinsure+1 Its brokerage segment alone contributes a substantial portion of its earnings. Wikipedia

2. Aon PLC

Headquartered in Ireland, Aon is a major player in risk, retirement, and health solutions. In recent years, its global brokerage revenue has hovered around US$15.7 billion, making it the second-largest broker in the world. Beinsure+1 Aon’s reach and diversified services help its continued dominance.

3. Arthur J. Gallagher & Co.

Gallagher is a U.S.-based broking firm known for its client-focused model and aggressive acquisition strategy. Its 2024 revenue reached roughly US$11.3 billion, placing it among the top three globally. Beinsure The company serves a broad range of clients, from individuals to multinational corporations.

4. Willis Towers Watson (WTW)

WTW resulted from the merger of Willis Group and Towers Watson. It provides broking, risk consulting, and human capital services. In 2024, its revenues stood at about US$9.93 billion, securing its position as a top global broker. Beinsure

5. Alliant Insurance Services

Alliant is one of the biggest U.S.-based brokers and is known for its strength in specialized risk areas such as public entity, construction, and hospitality. In 2024, its revenue reached approximately US$5.07 billion. Beinsure

6. Hub International

Hub International is a rapidly growing broker with strong presence in North America. In 2024, it reported revenues of around US$4.81 billion. Beinsure In 2025, it further made headlines for securing a valuation of US$29 billion, after a major investment. Reuters

7. Brown & Brown, Inc.

Brown & Brown has grown steadily through organic growth and acquisitions. It posted about US$4.81 billion in revenue in 2024. Beinsure Its scale and specialization in retail and commercial broking make it a significant force.

8. Acrisure

Acrisure is known for its digital-first and heavily acquisition-driven growth strategy. In 2024, it reached about US$4.59 billion in total revenue (broking and related services combined). Beinsure Its innovative model has disrupted traditional brokerage structures.

9. Lockton Companies

Lockton is a privately held firm and one of the largest independent brokers in the world. With global reach and a culture of client-centric advice, its 2024 revenue was approximately US$4.00 billion. Beinsure

10. Howden Insurance Brokers

Rounding out the top ten is Howden, a UK-based broker with a growing global footprint. In 2024, its total revenue reached US$3.60 billion, according to industry rankings. Beinsure Howden has earned its place through a mix of specialty insurance and international expansion.

Why These Brokers Matter

Risk Expertise: These top brokers offer deep risk insight, helping clients navigate complex exposures.
Global Reach: Many operate worldwide, providing consistent service across regions.
Innovation & Scale: Several are pushing digital transformation, making broking more efficient.
Consolidation: Their size gives them leverage to negotiate with insurers and provide better terms to clients.