Monday’s movers: Amgen, Onyx, Qihoo 360 By: MarketWatch August 26, 2013 at 08:53 AM EDT Shares of Amgen, Onyx Pharmaceuticals and Qihoo 360 Technology surge in premarket trade Monday while Microsoft continues to draw attention from investors. Read More >> Related Stocks: Amgen Anadarko Petroleum Expedia Facebook Microsoft