This is part 1 of Health Care's Colossus, a series about how UnitedHealth Group wields its unrivaled physician empire to boost its profits and ... health care in the United States.

But because their profits aren't growing, their investors aren't happy: Shares of UnitedHealth, CVS Health, and other large health care conglomerates have fallen this year, while the overall ...

finished more than 22% lower Thursday in the stock's worst day in over 25 years after the health-care giant's first-quarter results fell short of analysts' estimates and it cut its profit ...