US STOCKS-Wall St edges lower following six-day S&P rally By: Reuters: Company News April 23, 2014 at 10:17 AM EDT * Indexes down: Dow, S&P 500 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 Procter & Gamble