This stock doesn't need a 1929 crash to correct over 50%. Does anybody think that this company is really worth $4,000,000,000? Right now it has a market value of $9,150,000,000.
I believe that investors have a stop loss attitude towards this stock. "As long as it doesn't move down any more I will hold on"
What could happen is a large overnight move downwards. If that happens, investors will then be hoping for the return to the 260's with a distant thought of the 400's as the stock spirals downwards. The pain felt as the stock moved from 429 to 260 should be a reminder of how you would feel if you "hold on".
With a deceased CFO where the company will not discuss the details surrounding his death, this company is ripe for a significant decrease in value.
The stock price isn't a number, it drives the VALUE of the company.