List of the Largest Car Insurance Companies

While hundreds of smaller carriers operate nationwide, the top 10 auto insurance companies have roughly three-quarters of the market, and the top 20 account for 88 percent. These leading brands combine size, stability and national service networks. Are these the most popular car insurance companies?  Yes, by definition, these are the companies where the most people buy car insurance. 

State Farm, Progressive, and GEICO are the three largest car insurance companies and underwrite 47% of the nation's auto policies.  Progressive gained the most market share in 2024 (0.43%) and GEICO lost the most share (0.91%).

The table below lists the largest car insurance providers sorted by the most recent markets share analysis and includes the AM Best financial stability grade.

Note: Market share data is based on the NAIC's Market Share Report, showing how much of the auto insurance market each company holds. AM Best rates insurers’ financial strength, with A++ to A- indicating strong claims-paying ability.

Across the country, three major insurers have large market shares in each state markets. State Farm ranks as the largest auto insurance company in 35 states, often by a wide margin. GEICO is biggest in 8 states along much of the East Coast.  Progressive also is the largest in 7 states. The table below shows which insurer has the largest market share in every state and the percentage of policies it writes locally.

Explore more information about the largest car insurance companies with MoneyGeek’s reviews. Compare pricing, coverage, service and financial strength of the largest car insurance companies in the U.S.

The largest auto insurance companies provide strong financial backing, broad coverage options and nationwide service networks that appeal to many drivers.  Here are the pros and cons of selecting the biggest insurers:

Pros

• Strong financial stability and high AM Best ratings
• 24-hour claims service and extensive national support
• Widest range of coverage options and digital policy tools
• Large companies often have the cheapest rates due to their size, but you should shop quotes from at least 3 insurers as rates are personalized to your unique driving profile 

Cons

• Less pricing flexibility compared with smaller regional insurers
• Customer service can vary by region, branch or agent and is less personalized
• Limited customization for niche or specialized driver needs

The largest national car insurance companies operate across most states, offering consistent coverage options, digital tools and strong financial ratings. Their size provides stability and streamlined claims processes that most drivers need.

Regional auto insurance companies focus on specific states or areas. They often provide more personalized service and competitive rates tailored to local drivers, though their coverage networks and online tools are limited.

Major insurance companies offer digital tools that simplify policy management and improve customer service. Here are key features that differentiate leading insurers:

If you're comparing car insurance companies, you'll have questions about how the largest car insurance companies.  Here are the most frequently asked questions about the nations biggest auto insurers: