U.S. stocks extended gains on Thursday, with S&P 500 index gaining 1 percent as a brighter outlook from Procter & Gamble and a successful Treasury bond auction encouraged investors about an economic recovery.

The Dow Jones industrial average <.DJI> was up 73.76 points, or 0.77 percent, at 9,620.98. The Standard & Poor's 500 Index <.SPX> was up 1 percent before gains to 10.01 points, or 0.97 percent, at 1,043.38. The Nasdaq Composite Index <.IXIC> was up 22.11 points, or 1.07 percent, at 2,082.50.

(Reporting by Angela Moon, Editing by Kenneth Barry)