Wall St opens mixed after Thursday's fall

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 fell 356.5 points, or 0.81 percent, at the open to 43,820.13. The S&P 500 fell 3.4 points, or 0.06 percent, at the open to 6,114.1?, while the Nasdaq Composite rose 44.3 points, or 0.22 percent, to 20,006.693 at the opening bell.

But Alibaba (9988) extended gains by over 5 percent in early trade hours in New York.

REUTERS