Some firms, 6 to be exact, took a short right before earnings,
and yesterdays AH initial pop had them worried and scrambling to get downgrades issued to insure that the upside didn't reappear premarket. Now after the flush out of weak longs at 11:08 am one will has started to cover and the rest will slowly follow. Nobody wants to be last. Look at GRPN and Pandora (P) for whta's going on behind the scene.