If today strikes you as familiar it should be. It is almost a carbon copy of last Monday. Back then we gapped up 0.8% on news I still cannot find, rallied, slowed down, filled the gap and eventually ended in the red. So in reality the market was down about 1.1% during the 'real session and up 0.8% in the premarket (I include the first 5 minutes of the session as 'premarket' for this exercise since those prices reflect the doings of the premarket).
Today? An even bigger gap up but at least there is some sort of vague excuse with the Chinese currency. But at this moment the premarket/first 5 minutes showed a gain of well over 1% and the rest of the session is once again deep in the red.
Let us thank the premarket because if not for that we would have missed 0.8% last Monday, 0.8% last Tuesday and well over 1%. Heck that's about 3% lower.