1. UnitedHealth Direct Written Premiums: $176.7 billion Market Share: 14.1%

2. Kaiser Foundation Direct Written Premiums: $104.2 billion Market Share: 8.3%

3. Anthem, Inc. Direct Written Premiums: $76.9 billion Market Share: 6.2%

4. Centene Corp Direct Written Premiums: $75 billion Market Share: 6%

5. Humana Direct Written Premiums: $73.9 billion Market Share: 5.9%

6. CVS Direct Written Premiums: $69 billion Market Share: 5.5%

7. HCSC Direct Written Premiums: $42 billion Market Share: 3.4%

8. Cigna Health Direct Written Premiums: $31.8 billion Market Share: 2.5%

9. Molina Healthcare, Inc. Direct Written Premiums: $21.4 billion Market Share: 1.7%

10. Independence Health Group Direct Written Premiums: $20.1 billion Market Share: 1.6%