
Feb 21 (Reuters) - Wall Street's main indexes opened mixed on Friday, a day after Walmart's dour forecast hit sentiment, while UnitedHealth slid after a report that the U.S. Justice Department is investigating the healthcare conglomerate.
The Dow Jones Industrial Average .DJI fell 356.5 points, or 0.81%, at the open to 43820.13. The S&P 500 .SPX fell 3.4 points, or 0.06%, at the open to 6114.1, while the Nasdaq Composite .IXIC rose 44.3 points, or 0.22%, to 20006.693 at the opening bell.