Alliant Insurance Services Rises to #4 on the Business Insurance Largest U.S. Brokers List

Growth driven by organic expansion, strategic investment, and a people-first operating model

IRVINE, Calif.--(BUSINESS WIRE)--Alliant Insurance Services has moved up to the #4 ranking on Business Insurance’s list of the 100 Largest Brokers of U.S. Business and ranks #6 on the World's Largest Insurance Brokers list. Published annually, the rankings recognize the top insurance brokerage firms worldwide based on prior-year revenue.

“Alliant’s continued rise reflects the strength of our people, the depth of our platform, and our ability to deliver specialized solutions at scale,” said Alliant CEO Greg Zimmer. “As we grow, we remain focused on creating an environment where entrepreneurial professionals can do their best work and clients benefit from the full breadth of Alliant’s expertise.”

In addition, Alliant retained the #1 spot on the Largest Privately Owned Brokers list, further underscoring the company’s scale and market position.

Alliant closed 2025 with more than $5.7 billion in revenue and $55 billion in premium and is well positioned to build on this momentum through continued growth, investment, and expansion.

"As our business continues to grow, we remain committed to investing in our people and expanding the capabilities that help our clients navigate an increasingly complex risk environment," Zimmer added. "That commitment will continue to shape our success and create new opportunities for the future."

About Alliant Insurance Services

Alliant Insurance Services stands among the nation’s top insurance brokers and consultants, providing risk management, insurance, employee benefits, underwriting, and consumer solutions through an entrepreneurial approach focused on delivering smarter, more effective outcomes. Free from the constraints of traditional brokerage models, Alliant combines deep expertise with the flexibility to innovate—helping clients navigate complexity and respond to evolving risks.

Within the industry, Alliant is recognized as a leading destination for top-tier brokerage talent in the U.S. As a majority employee-owned organization, it offers professionals a high degree of autonomy, access to extensive resources, and a distinctive equity ownership opportunity. This approach has contributed to an impressive producer retention rate, along with being recognized by Forbes as one of America’s Best Large Employers and one of America’s Most Trusted Companies.

Visit us at alliant.com.