As of 2025, the top insurance companies in the United States, based on various metrics such as revenue, market share, and customer satisfaction, include:

1. UnitedHealth Group: A leading health insurer, UnitedHealth Group reported direct written premiums of approximately $248.8 billion in 2023.
2. Berkshire Hathaway (GEICO): Through its subsidiary GEICO, Berkshire Hathaway is a major player in the auto insurance market, with significant assets and revenues.
3. State Farm: Dominating the property and casualty insurance sector, State Farm had direct premiums written totaling $93.8 billion, capturing a 9.9% market share.
4. Progressive Corporation: A key provider in auto insurance, Progressive held a 6.6% market share with direct premiums written amounting to $62.7 billion.
5. Allstate Corporation: Offering a range of insurance products, Allstate is a significant player in the auto and home insurance markets.
6. CVS Health (Aetna): Following its acquisition of Aetna, CVS Health has become a substantial entity in the health insurance sector, with direct written premiums of about $97.6 billion.
7. Cigna Health: A major health insurer, Cigna reported direct written premiums of approximately $39.6 billion.
8. Humana: Specializing in health insurance, particularly Medicare Advantage plans, Humana had direct written premiums totaling $100.5 billion.
9. Kaiser Foundation (Kaiser Permanente): Operating as both a health insurer and healthcare provider, Kaiser reported direct written premiums of $94.1 billion.
10. Liberty Mutual: A prominent property and casualty insurer, Liberty Mutual is known for its extensive range of insurance products.