标普500指数短暂转涨。

Group 1 - The S&P 500 index briefly turned positive during trading [1] - As of December 11, the S&P 500 index was at 6886.940, showing a slight increase of 0.260, or 0.00% [2] - The index opened at 6861.300 and reached a high of 6887.660, with a trading volume of 1.258 billion [2] Group 2 - The previous close for the S&P 500 index was 6886.680, with a low of 6833.450 during the trading session [2] - There were 390 stocks advancing, 110 declining, and 3 remaining flat [2] - The VIX (Volatility Index) futures decreased by 1.28% to 16.45 [2]