Wall Street‘s main indexes opened at record highs on Tuesday after upbeat forecasts from companies such as UnitedHealth and UPS, while Apple topped $4 trillion in market value for the first time, boosted by strong demand for its latest iPhone models.The Dow Jones Industrial Average rose 207.8 points, or 0.44%, at the open to 47,752.35. The S&P 500 rose 22.6 points, or 0.33%, at the open to 6,897.74, while the Nasdaq Composite rose 129.0 points, or 0.55%, to 23,766.463 at the opening bell.