Institutional Investors "move the markets." They dump millions of dollars on a stock, driving its share price as high as the sky, then dump it like a piece of trash. That's what happens almost every day in the market. The big guys come in, influence the markets then leave. That's why I always insist on investments that are based on solid economics and fundamentals analysis, and buying a stock at a fair price, rather than just day trading or buying whatever your neighbor advised you to buy.
I can never emphasize enough the need to stick with the idea of investing with intelligence-an investment based only on thorough analysis- so you don't swim with the sharks and see your nest egg destroyed and your life ruined.