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NEW YORK, Oct 7 (Reuters) - U.S. stocks ended higher after a volatile session on Wednesday, led by a rebound in biotechnology companies that pushed the S&P 500 to its highest level in three weeks.
The Dow Jones industrial average rose 121.96 points, or 0.73 percent, to 16,912.15, the S&P 500 gained 15.9 points, or 0.8 percent, to 1,995.82 and the Nasdaq Composite added 42.79 points, or 0.9 percent, to 4,791.15.
The Nasdaq Biotech Index rose 2 percent after falling 3.8 percent in the previous session.
Reporting by Rodrigo Campos; Editing by Nick Zieminski