U.S. Stocks Open Lower, Eye Third Day Of Declines

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.