U.S. stocks opened with solid gains on the last day of the month and quarter Wednesday, but are still on track to post substantial monthly and quarterly losses. The main indexes are on track to post the biggest quarterly decline since September 2011. The S&P 500 opened 21 points, or 1.1%, higher at 1,905. The Dow Jones Industrial Average opened 170 points, or 1.1%, higher at 16,219. The Nasdaq Composite began the day up 66 points, or 1.5%, at 4,584.
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