US STOCKS-Wall St drops but S&P, Nasdaq register quarterly gains By: Reuters: Company News March 31, 2015 at 18:34 PM EDT * Dow down 1.1 pct, S&P 500 down 0.9 pct, Nasdaq down 0.9 pct (Updates close with latest volume, details on healthcare sector) Read More >> Related Stocks: Exxon Mobil