McKesson Corp.and UnitedHealth Group are two of the world's largest healthcare companies by revenue, according to Largest.org, which ranks companies based on revenue and other factors.
1. McKesson Corp. - $208.3 billion
2. UnitedHealth Group - $201 billion
3. CVS Health - $184.7 billion
4. AmerisourceBergen Corporation - $153.1 billion
5. Cardinal Health - $129.9 billion
6. Express Scripts Holding - $100.06 billion
7. Anthem - $89.06 billion
8. Kaiser Permanente - $72.7 billion
9. Aetna - $60.5 billion
10. Humana - $53.7 billion