The Dow Jones sharply changed course and plummeted over 600 points in Thursday's premarket session, led by a sharp selloff in UnitedHealth Group. Shares of the health giant plunged more than 20% after the company posted its first quarterly earnings miss in years and slashed its full-year outlook. The stock is on track for its worst trading day since 1998, shaking investor confidence and dragging the broader market lower.
Dow Jones Industrial Average plummeted 1.52% or 607 points at 7:40 am ET. Meanwhile, the Nasdaq 100 gained 0.73% at 7:42 am ET, while the S&P 500 added 0.50% concurrently.
