5 largest health insurance companies by membership

UnitedHealthcare is the largest insurer in the U.S., according to a July 2023 report from Value Penguin. 

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The health insurance industry is dominated by five companies that own 46 percent of the market. 

Here are the top five largest health insurance companies by membership: 

  1. UnitedHealthcare
  2. Anthem
  3. Aetna 
  4. Cigna
  5. Humana

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