Excluding any new developments, insider buying, analyst recommendations, news and other events, when there are large amounts of Institutional buying, the stock tends to go up, and tends to go down when there is large selling

If Institutions and Gurus are adding or creating large positions in a stock, and the price is going down, look for reasons why. If you can not find a reason, this may represent a buying opportunity. Reversed, if Institutions and Gurus are selling off or closing large positions in a company and the price is still going higher look for reasons why. If you can not find a reason, you may want to use extra caution in creating a position or while holding a position..