Apple and Amazon..... It is hard to tell which one is which... in this daily chart going back over 2 1/2 years!
This chart would make you think twice about whether anyone is doing any thinking at all about how to value these stocks OR are investors and mutual fund managers just poring money into these stocks blindly, owning them just because they have to own them to represent some index that they fear to lag.
This chart extends back to Feb 2009, and what I notice about both of these charts is that if they drop a little bit further, there will be quite a few people who will sell simply because the price is going down. The trendlines will break that go back several YEARS and that's when you want to cover your short positions and look for a bounce.
Until those trendlines break meaningfully, the short side of these two stocks is the least risky trade to take.