U.S. stocks opened higher on Tuesday, after two-day slump that was driven by the selloff in technology shares. The Nasdaq Composite, which fell nearly 3% over the past two sessions was set to recover some of the losses. Gains on Wall Street were tepid, however, as investors wait for the Federal Reserve’s policy meeting with many expecting a rate hike on Wednesday. The S&P 500 SPX, +0.45% opened 6 points, or 0.3%, higher at 2,435. The Nasdaq Composite COMP, +0.73% was up 37 points, or 0.6%, to 6,213 at the open. The Dow Jones Industrial Average DJIA, +0.44% began the session up 40 points, or 0.2%, at 21,276. Among the biggest gainers, NVIDIA Corp NVDA, +0.95% jumped about 3% at the open. The stock is up more than 200% over the past 12 months.