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NEW YORK, Oct 20 (Reuters) - U.S. stocks fell at the open on Monday to extend four consecutive weeks of losses as indexes were weighed by IBM, which fell more than 7 percent on disappointing quarterly results.
The Dow Jones industrial average fell 108.34 points, or 0.66 percent, to 16,272.07, the S&P 500 lost 4.22 points, or 0.22 percent, to 1,882.54 and the Nasdaq Composite dropped 9.91 points, or 0.23 percent, to 4,248.53.
Reporting by Rodrigo Campos; Editing by Bernadette Baum