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Wall Street ticks down at open, DuPont weighs

A Wall Street sign is pictured in the rain outside the New York Stock Exchange in New York June 9, 2014. REUTERS/Carlo Allegri

NEW YORK (Reuters) - U.S. stocks edged lower at the open on Friday, with materials weighing the most after DuPont lowered its quarterly and yearly outlooks.

The Dow Jones industrial average (.DJI) fell 18.4 points, or 0.11 percent, to 16,827.73, the S&P 500 (.SPX) lost 2.97 points, or 0.15 percent, to 1,954.25 and the Nasdaq Composite (.IXIC) dropped 3.73 points, or 0.09 percent, to 4,375.32.

(Reporting by Rodrigo Campos; Editing by Bernadette Baum)