On Pace to be SPX's 3rd Best Month Since Turn of the Century E-Mini S&P 500 CME_MINI:ES1! JohnKicklighter We have one more trading day in the month and the SPX0.00%% is already floating one of the best monthly performances we have seen in quite a long time. In fact, the current standing (via eminis) is the third strongest month in over 15 years.