US STOCKS-Wall St edges down after six-day S&P rally; AT&T falls By: Reuters: Company News April 23, 2014 at 11:52 AM EDT * Indexes down: Dow 0.1 pct, S&P 0.1 pct, Nasdaq 0.5 pct (Updates to open) Read More >> Related Stocks: AT&T Inc Amgen Biogen Idec Boeing Co Dow Chemical Gilead Sciences Verizon Communications