The recent meteoric rise of Tesla Motors (NASDAQ:TSLA) shares has left many investors in a state of awe. Along with that rise, we have some insiders selling big positions in the stock in the month of August. Sellers on the docket include two directors and one vice president of manufacturing. While insider buying is a pretty straightforward gauge of optimism, insider selling is much more difficult measure to read into.

Don't be discouraged, though: Insider selling is an important factor and shouldn't be ignored. In the video below, Motley Fool analyst Blake Bos offers a brief guide to looking at insider selling and let's investors know if they should care about the selling taking place at Tesla Motors.