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NEW YORK, May 7 (Reuters) - U.S. stocks rose at the open on Wednesday, on the heels of the biggest drop in the S&P 500 since mid-April, as earnings season winds down and ahead of congressional testimony from Federal Reserve Chair Janet Yellen.
The Dow Jones industrial average rose 77.23 points, or 0.47 percent, to 16,478.25, the S&P 500 gained 6.26 points, or 0.34 percent, to 1,873.98 and the Nasdaq Composite added 2.104 points, or 0.05 percent, to 4,082.863. (Reporting by Chuck Mikolajczak; Editing by Bernadette Baum)