U.S. stocks opened sharply higher on Tuesday, with major indexes hitting their latest in a string of records and the Dow breaking through its latest 1,000-point milestone. The Dow Jones Industrial Average rose 215 points, or 0.9%, to 26,025. The S&P 500 added 15 points, or 0.5%, to 2,801. The Nasdaq Composite Index added 52 points, or 0.7%, to 7,312. Corporate earnings were a main driver of trading, both UnitedHealth Group Inc. and banking heavyweight Citigroup Inc. were among the stocks that reported. Shares of UnitedHealth rose 2.7% while Citigroup gained 1.4%. Separately, General Electric Co. fell 2% after the conglomerate said a review of GE Capital's insurance portfolio would result in a $6.2 billion after-tax charge in the fourth quarter.