Group 1 - The S&P 500 index experienced a slight increase of 0.08%, reaching 6867.520, but later showed signs of a decline after earlier gains [1][2] - The trading session on February 20 saw the index open at 6843.260, with a high of 6909.870 and a low of 6836.330, resulting in a trading range of 1.07% [2] - The volume of shares traded was reported at 1.364 billion, with 216 stocks advancing and 286 declining [2] Group 2 - The S&P 500 futures were up by 0.03%, indicating a slight positive sentiment in the futures market [2] - The VIX, or volatility index, decreased by 1.01%, settling at 20.54, suggesting a reduction in market fear [2] - The related ETF, S&P 500 ETF, saw a decline of 0.44%, closing at 1.798 [2]

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]