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.

All 20 companies on this list carry an AM Best rating of A- or higher. Our analysis found that the largest auto insurance carriers are financially stable across the board, which means price, coverage options and customer service are worth comparing more closely than financial strength ratings alone.

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 market. State Farm ranks as the largest auto insurance company in 35 states, often by a wide margin. GEICO is the biggest in eight states along much of the East Coast.  Progressive is also the largest in seven states. The table below shows which insurer has the largest market share in every state and the percentage of policies it writes locally.

In reviewing NAIC market share data across all 50 states, we found that Massachusetts is the only state where a regional provider leads. MAPFRE holds the largest share there at 17%, ahead of every national carrier. All other states are led by a national insurer.

Find 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.

Large auto insurance companies offer financial strength, broad coverage options and nationwide service networks. Here's what to weigh before choosing one:

Pros

• Strong financial stability and strong AM Best ratings
• Around-the-clock claims support and national service coverage
• Wide selection of coverage options and digital policy tools
• Large insurers often price competitively due to their scale, though rates are personalized to your driving profile, so comparing at least three quotes is worth the time

Cons

• Less pricing flexibility than smaller regional insurers
• Customer service quality varies by region, branch and agent, with less one-on-one attention
• Fewer options for specialized coverage needs

The largest national car insurance companies operate across most states with consistent coverage options, digital tools and strong financial ratings. Their scale supports stable claims processes and broad service availability.

Regional auto insurance companies focus on specific states or areas, often offering more personalized service and rates built around local driving conditions. The tradeoff is a smaller coverage network and fewer online tools than national carriers provide.

Major insurers offer digital tools that simplify policy management and improve customer service. There are features that help you tell leading insurers apart:

If you're comparing car insurance companies, you'll have questions about how the largest car insurance companies.