US STOCKS-Wall St gives up gains as GDP raises Fed concerns By: Reuters: Company News July 30, 2014 at 11:59 AM EDT * Dow down 0.4 pct, S&P down 0.1, Nasdaq up 0.3 pct (Updates to midday trading) Read More >> Related Stocks: AFLAC American Express Amgen Boeing Co Facebook Humana Regeneron Pharmaceuticals Twitter, Inc. United Parcel Service UnitedHealth Group