Since yesterday, the spread between ES & ER has been much wider than usual, ER2 rallied 1% more than ES! Why? Usually, it's a case of pump & dump, when this happens...is there other reasons? I know they have different underlying but, regardless when ES performs poorly, it should pull down others too, or Not? For me, someone is selling the ES and buying the ER and when the time is right, hit the reverse!