US STOCKS-Wall St ends down in volatile session; materials a drag By: Reuters: Company News January 13, 2015 at 16:45 PM EST * Indexes down: Dow 0.2 pct, S&P 0.3 pct, Nasdaq 0.1 pct (Updates to close) Read More >> Related Stocks: Alcoa Citigroup Goldman Sachs Group Goodyear Tire & Rub Intel Corp JPMorgan Chase & Co Wells Fargo