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Is it possible to quantify the probability of sudden big movements for a high-volume stock?
In general, when companies are regarded as "hot" growth stocks, they are expected to keep up an accelerated level of growth for a good long time. That accelerated growth justifies a high PE relative to a slow-growth stock. When companies that are supposed to grow miss expectations or (worse) lose money, the markets punish the stock severely... Particularly if the company doesn't make analysts aware of problems early on. Netflix is a great example of a company bungling a few different business problems, creating a much bigger one in the process. A poorly conceived rate hike killed the reliable cash flow of the company, and that crazy Quixter thing just confused everyone. Now nobody trusts the management. BlackBerry is another example of a high performing company that just screwed up, damaging shareholders in the process. We're living in a very challenging era today, but growth stocks are always risky by nature -- growing a company rapidly is very difficult.