Midday movers: Twitter, Tyson, Rentrak & More By: CNBC.com News January 16, 2014 at 12:20 PM EST Take a look at some of Thursday's midday movers: Read More >> Related Stocks: 3D Systems Corp CBS Corp Charles Schwab Herbalife Ltd Hershey Co J C Penney Company Inc Nu Skin Enterprises Ralph Lauren Corp Sarepta Therapeutics Twitter, Inc. Tyson Foods Usana Health Sciences Inc Vmware Inc YRC Worldwide