Stocks extended gains on Wednesday, with the S&P 500 rising 1 percent after an auction for U.S. government debt.

The Dow Jones industrial average <.DJI> was up 76.41 points, or 0.80 percent, at 9,573.75. The Standard & Poor's 500 Index <.SPX> was up 10.64 points, or 1.04 percent, at 1,036.03. The Nasdaq Composite Index <.IXIC> was up 27.79 points, or 1.36 percent, at 2,065.56.

(Reporting by Edward Krudy, Editing by Kenneth Barry)