UnitedHealth fell 4 percent to USD 112.49, making the health insurer the biggest drag on the Dow. The company's profit warning sent shares of peers Anthem and Aetna  down more than 6 percent.
The S&P healthcare sector was the worst performer among the 10 major S&P sectors with a 1.66 percent decline. UnitedHealth and Pfizer weighed the most.
Pfizer was down 3.5 percent after reports that the company's talks to buy Allergan and redomicile in Ireland were in final stages. Allergan was down 2.8 percent.
Data yesterday appeared to support the Federal Reserve's view of a strengthening labor market ahead of its meeting next month. The number of Americans filing for unemployment benefits fell last week.
Minutes from the Fed's October meeting, released on Wednesday, hardened expectations of a December interest rate hike and hinted at a cautious approach after that.

Latest News  from Business News Desk