US STOCKS-Wall St drops as biotechs, semis stumble By: Reuters: Company News March 25, 2015 at 14:18 PM EDT * Indexes off: Dow 1.11 pct, S&P 0.89 pct, Nasdaq 1.6 pct (Updates to afternoon trade, changes byline) Read More >> Related Stocks: Berkshire Hathaway Kraft Foods Group