Shares of Vertex Pharmaceuticals Inc.
plunged 10.96% to $193.02 Friday, on what proved to be an all-around positive trading session for the stock market, with the S&P 500 Index
rising 0.19% to 4,247.44 and the Dow Jones Industrial Average
rising 0.04% to 34,479.60. The stock's fall snapped a three-day winning streak. Vertex Pharmaceuticals Inc. closed $113.06 below its 52-week high ($306.08), which the company reached on July 7th.
The stock underperformed when compared to some of its competitors Friday, as Johnson & Johnson
fell 1.27% to $164.96, Merck & Co. Inc.
rose 0.17% to $76.27, and AbbVie Inc.
fell 0.71% to $115.42. Trading volume (13.7 M) eclipsed its 50-day average volume of 1.6 M.