Midday Movers: Red Robin, SeaWorld, Merck & more By: CNBC.com News August 14, 2014 at 12:59 PM EDT Take a look at some of Thursday's midday movers: Read More >> Related Stocks: Advance Auto Parts Inc Ally Financial Berkshire Hathaway Goldman Sachs Group Merck & Co Newlink Genetics Cor Perrigo Plug Power Inc Re/Max Holdings Inc Red Robin Gourmet Burgers Inc Seaworld Entertainment Inc Company Vipshop Holdings Ltd ADR Weyerhaeuser Co