1. UnitedHealth Group

Founded - 1977

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2.  Anthem

Founded - 2014

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3.  Kaiser Permanente

Founded - 1945

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4.  Aetna

Founded - 1853

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5. Cigna

Founded - 1792

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6.  Humana

Founded - 1961

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7. Centene Corporation

Founded - 1984

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8. Molina Healthcare

Founded - 1980

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9. Health Care Service Corporation

Founded - 1936

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10. WellCare Health Plans

Founded - 1985

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