As of my last knowledge update in January 2022, here is a list of the top 10 largest insurance companies in the United States based on their total assets and market share. Please note that rankings and figures may change over time, so it's a good idea to consult the most recent financial reports and market research for the latest information.
State Farm: State Farm is the largest insurance company in the United States and offers a wide range of insurance products, including auto, home, and life insurance.
Berkshire Hathaway (GEICO): Berkshire Hathaway is a conglomerate that owns several businesses, with GEICO being one of its major insurance subsidiaries. GEICO primarily focuses on auto insurance.
Progressive: Progressive is well-known for its auto insurance services and is one of the leading providers in the United States.
Allstate: Allstate provides a variety of insurance products, including auto, home, and life insurance.
USAA: USAA primarily serves members of the military and their families, offering auto, home, and other insurance products.
Liberty Mutual: Liberty Mutual is a global insurer that provides various insurance services, including auto, home, and business insurance.
Farmers Insurance Group: Farmers Insurance offers auto, home, and other insurance products to its customers.
Nationwide: Nationwide is known for its auto and home insurance services, as well as various financial products.
Travelers: Travelers is a large insurance company offering a wide range of insurance options, including auto, home, and business insurance.
American Family Insurance: American Family Insurance provides coverage for auto, home, and other personal insurance needs.
Please keep in mind that the rankings and market share of these companies may have changed since my last update. It's always a good idea to verify the most current information through financial reports, industry publications, or market research organizations for the latest data on the largest insurance companies in the United States.