ALLIANT INSURANCE SERVICES, INC.

Alliant Insurance Services is a leading insurance brokerage and consulting firm headquartered in Irvine, California. The company's core business revolves around providing diversified insurance products and services, with a mission to deliver comprehensive insurance and risk management solutions to a broad spectrum of clients.

The firm offers a wide array of services, including property and casualty insurance, employee benefits, risk management, life insurance, retirement and savings programs, and various specialty insurance programs. Alliant serves diverse market segments such as agriculture, aviation, construction, energy, financial industries, public entities, tribal nations, healthcare, real estate, law firms, and high-net-worth individuals through its Private Client group.

Alliant Insurance Services is privately held and is recognized as one of the largest privately owned insurance brokers in the United States. As of 2025, it was ranked as the #1 largest privately owned broker and #5 globally on Business Insurance's list of the World's 10 Largest Insurance Brokers, reporting $5.72 billion in brokerage revenue in 2025. Greg Zimmer serves as the Chief Executive Officer, a role he assumed in January 2024, succeeding Tom Corbett, who transitioned to Executive Chairman. The company continues to expand its operations, including recent additions to its employee benefits team and the launch of a new retirement and wealth management business.