Insider buying is an indication that insiders beleive that the share price of a company is going to rise. Insider selling, on the other hand, does not necessarily indicate that the sellers believe that the price of a stock will decline. It often occurs because these insiders live lives just a everyone else doesand that included spending money. Since this is a source of income, they often sell shares so that large purchases can be made. If you look at past data, you'll find that often as not insider selling is followed by rising prices. Keep that in mind, when you make decisions based on observations of insider trading.