US STOCKS-S&P 500 gains for an 8th day, buoyed by Citigroup By: Reuters: Company News July 15, 2013 at 17:03 PM EDT * Empire State manufacturing index up, but retail sales soft Read More >> Related Stocks: AT&T Inc Alexion Pharmaceuticals Boeing Co Cintas Corp Citigroup First Solar FirstEnergy Corp Public Svc Enterprises Qualcomm, Inc.