Yes, but judging by the daily short volume they are partially blamed for this leg up by their manic covering. I have no idea where the machine is ramping this to but this is officially in the last phase of the bubble. Some longs will get burned for greed. This is a momentum play, once it stop look out below. Some idiots will try to buy the pullback but it will be good for bag holding.
why does it have to be short covering: could merely be the realization that Bernanke is still there as the "greatest put' in stock market history behind the markets. And as a leader up since QE started, AMZN rockets the most, as the market continues to be backed by easy money with no end in sight.