Based in Pennsylvania , US , Universal Health Services , Inc provides healthcare management services , including the running of hospitals , behavioural health centres , surgical hospitals , ambulatory centres and radiation oncology centres . The company reported a net revenue of $ 9.77bn in 2017 , continuing a five-year trend of growth from $ 6.9bn in 2013 . Universal Health is the largest operator of psychiatric hospitals in the USA . www . uhsinc . com

DaVita Inc is based in Denver , Colorado , and specialises in the operation of clinics providing kidney dialysis to chronically ill outpatients , as well as the management and operation of medical groups and affiliated physician networks across California , Nevada , New Mexico , Florida , Colorado and Washington . The company reported net sales of $ 14.74bn in 2017 , along with a year-over-year profit increase of over $ 600mn . www . davita . com