Car Insurance Providers The 10 largest car insurance providers in the US dominate the market. Find out what sets them apart from industry competitors in this article The top 10 auto insurance providers in the U.S. continue to dominate the market, underwriting three-quarters (77%) of the nation's auto policies, the latest market share data released by the National Association of Insurance Commissioners (NAIC) reveals. This number is slightly higher than $213.1 billion in direct written premiums – a 14.5% increase over the previous year. But despite a handful of major companies dominating the auto insurance industry, these insurance companies also offer a wide variety of products, benefits and services to customers. To give insurance buyers a picture of what the nation's leading car insurers offer in terms of coverage, Insurance Business ranks the largest auto insurance companies in this article. We will give you a breakdown of the various policies you can access fr...