U.S. stocks opened lower on Wednesday as investors remained cautious in light of volatility in commodity markets. The main indexes are on track to extend losses to a third straight day. The S&P 500 opened 5 points, or 0.2%, lower to 2,058. The Dow Jones Industrial Average opened 29 points, or 0.2%, lower at 17,540. Shares of Dow Chemical Co. and DuPont jumped on reports of a possible merger. The Nasdaq Composite began the session down 19 points, or 0.4%, to 5,078.
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