Stocks stumbled on Tuesday as materials stocks sold off after Nucor Corp forecast a first-quarter loss and Alcoa Inc cut its spending and dividend.

* The Dow Jones industrial average <.DJI> shed 33.85 points, or 0.47 percent, to 7,183.12. The Standard & Poor's 500 Index <.SPX> dropped 3.53 points, or 0.47 percent, to 750.36. The Nasdaq Composite Index <.IXIC> gained 1.90 points, or 0.14 percent, to 1,405.92.

(Reporting by Deepa Seetharaman, Editing by Chizu Nomiyama)