Here is the Medicare Advantage enrollment Aetna, Anthem, Cigna, Humana and UnitedHealthcare recorded as of Dec. 31, 2018, ranked from highest to lowest*:
1. UnitedHealthcare: 4.9 million
2. Humana: 3.1 million
3. Aetna, owned by CVS: 1.8 million
4. Anthem: 1 million
5. Cigna: 436,000
*Enrollment numbers are from insurers’ most recent financial documents
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