标普500指数高开15.85点，涨幅0.25%，报6405.62点；道琼斯工业平均指数低开3.82点，跌幅0.01%，报44833.74点；纳斯达克综合指数高开108.14点，涨幅0.51%，报21286.72点。

Core Points - The S&P 500 index opened up by 15.85 points, representing a 0.25% increase, reaching 6405.62 points [1] - The Dow Jones Industrial Average opened down by 3.82 points, reflecting a 0.01% decrease, at 44833.74 points [1] - The Nasdaq Composite index opened up by 108.14 points, indicating a 0.51% increase, at 21286.72 points [1]