US STOCKS-Wall St mixed as doubts about earnings offset biotech M&A bid By: Reuters: Company News April 21, 2015 at 15:16 PM EDT * Dow off 0.45 pct, S&P down 0.1 pct, Nasdaq up 0.48 pct (Updates to afternoon) Read More >> Related Stocks: Facebook Google, Inc. Microsoft Qualcomm, Inc. TravelersCompanies