U.S. stocks added to gains in early trade on Monday, with the Nasdaq and S&P 500 rising 1 percent, after a pledge from the Group of 20 to keep economic stimulus in place bolstered risk appetite.

* Gains were broad-based, with natural resource-oriented companies and technology shares among the biggest advancers.

* The Dow Jones industrial average <.DJI> gained 80.64 points, or 0.80 percent, to 10,104.06. The Standard & Poor's 500 Index <.SPX> rose 9.69 points, or 0.91 percent, to 1,078.99. The Nasdaq Composite Index <.IXIC> added 23.34 points, or 1.10 percent, to 2,135.78.

(Reporting by Leah Schnurr; editing by Jeffrey Benkoe)