US stocks open lower; data, Fed speakers eyed By: CNBC.com News March 31, 2015 at 09:30 AM EDT U.S. stocks opened sharply lower on Tuesday, following the prior day's major gains, as investors eyed economic data and the end of the first quarter. Read More >> Related Stocks: Acuity Brands Inc Amazon.com CarMax Comcast Corp Danone ADR Herbalife Ltd International Business Machines Monsanto Co Starbucks Corp