I have been trading the Banks as well but ASX ones and the sector has gone up by almost 30% from June of this year and there will be lot of nervous hands that will take profit at this high levels. Even MQG Macquarie which is not part of the big four has gone up quite a bit. Both WBC and CBA are over 100B Market Cap a few days ago and even ANZ was about to join 100B club. Now only CBA is over 100B. Investors are waiting for some fundamentals to prop up this market for the next stage.