S&P 500 Movers: PCAR, BIIB
January 30, 2015 at 10:39 AM EST
In early trading on Friday, shares of Biogen Idec (BIIB) topped the list of the day's best performing components of the S&P 500 index, trading up 11.2%. Year to date, Biogen Idec registers a 15.8% gain.