The Fortune 500 list has documented the top-earning U.S. companies every year since 1955. Since the list's inception, there have been only 54 companies that made the list every year, six of which are healthcare companies, according to Fortune.
The six healthcare companies, in order of their rank on the 2018 Fortune 500 list:
37. Johnson & Johnson
57. Pfizer
78. Merck
111. Abbott Laboratories
129. Eli Lilly
145. Bristol-Myers Squibb