U.S. stocks opened lower on Wednesday, building on the previous session's losses as a slump in oil continued to put pressure on equities. The S&P 500 opened 14 points, or 0.8%, lower at 1,906. The Dow Jones Industrial Average lost 95 points, or 0.6%, to 16,337 shortly after the open. Meanwhile, the Nasdaq Composite began the day down 50 points, or 1.1%, at 4,453.
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