S&P 500 Movers: QRVO, ALXN
March 15, 2018 at 10:33 AM EDT
In early trading on Thursday, shares of Alexion Pharmaceuticals (ALXN) topped the list of the day's best performing components of the S&P 500 index, trading up 8.5%. Year to date, Alexion Pharmaceuticals registers a 11.3% gain.