Here are some of the top US business companies by revenue (in no particular order):
1. Walmart
2. Amazon
3. Exxon Mobil
4. Berkshire Hathaway
5. Apple
6. UnitedHealth Group
7. McKesson
8. CVS Health
9. AmerisourceBergen
10. AT&T
11. Chevron
12. Ford Motor
13. General Motors
14. Cardinal Health
15. JPMorgan Chase & Co.
16. Verizon Communications
17. Costco Wholesale
18. Boeing
19. Fannie Mae
20. Alphabet (Google)
Please note that this list is not exhaustive and there are many other successful businesses in the United States.