S&P 500 Movers: VRSN, BIIB
March 17, 2014 at 13:22 PM EDT
In early trading on Monday, shares of Biogen Idec (BIIB) topped the list of the day's best performing components of the S&P 500 index, trading up 3.9%. Year to date, Biogen Idec registers a 23.5% gain.