U.S. stocks drift lower after weak PMI By: MarketWatch March 24, 2014 at 09:21 AM EDT U.S. stocks drift lower after Markit’s initial purchasing managers index for March falls slightly. Read More >> Related Stocks: Apple Biogen Idec Comcast Corp First Solar Gilead Sciences Herbalife Ltd Nasdaq Biotechnology Ishares ETF St. Jude Medical Standard & Poors 500