Fortune this week released its ranked list of the 500 companies that generated the most revenue in the previous fiscal year, and it includes at least 15 health care systems and insurers.
One Fortune 500 CEO has banned 'work from home'—will more follow?
To create the list, researchers ranked U.S. companies based on total revenues for the previous fiscal year based on government filings.
Health care providers on this year's included:
79. HCA Holdings (Nashville, Tenn.)
192. Community Health Systems (Franklin, Tenn.)
229. Tenet Healthcare (Dallas, Texas)
230. DaVita HealthCare Partners (Denver, Col.)
324. Universal Health Services (King of Prussia, Pa.)
388. Vanguard Health Systems (Nashville, Tenn.)
441. Kindred Healthcare (Louisville, Ky.)
462. St. Jude Medical (St. Paul, Minn.)
Meanwhile, several health insurance companies made the list, including:
14. UnitedHealth Group (Minnetonka, Minn.)
38. WellPoint (Indianapolis, Ind.)
57. Aetna (Hartford, Conn.)
73. Humana (Louisville, Ky.)
97. Cigna (Bloomfield, Conn.)
254. Health Net (Woodland Hills, Calif.)
294. WellCare Health Plans (Tampa, Fla.)
324. Universal Health Services (King of Prussia, Pa.)
393. Molina Healthcare (Long Beach, Calif.)
Walgreen: Pushing into care delivery, but also shuttering 76 stores
Other health care companies on the list
Walmart—which has been rapidly expanding into the health care sector—topped the Fortune 500 list for the second straight year. According to Fortune, the retail giant weathered a difficult year and remains in the top spot because it was "bullish about its plans to open even more small stores, which compete with drugstores and small grocery stores."
Walmart's new plan: 'Full primary care services' within seven years
Other health care-related companies in the top 100 spots of the Fortune's list included:
12. CVS Caremark (Woonsocket, R.I.)
20. Express Scripts Holdings (St. Louis, Mo.)
22. Cardinal Health (Dublin, Ohio)
36. Target (Minneapolis, Minn.)
37. Walgreen (Deerfield, Ill.)
39. Johnson & Johnson (New Brunswick, N.J.)
51. Pfizer (New York, N.Y.).
65. Merck (Whitehouse Station, N.J.)
Source: Fortune 500 list, 6/1/2014
Are you ready to compete?

Walgreen isn't the only organization potentially pushing into care delivery. What about Walmart?
Whether or not drugstores or retailers become major players in the provider market, health systems need to fundamentally shift their growth strategy, because the basis for competition is about to radically change.