In a victory for common sense the trading behavior of company executives directors and large shareholders in the stocks of firms they're registered "insiders" at have been proven profitable to monitor by both academic studies and (more importantly) the experience of your fellow professional investors. Below are lists of the top 10 mainly open-market insider purchases and sales filed at the Securities and Exchange Commission Friday February 22 2013 as ranked by dollar value. Please note however that these are factual lists not buy and sell recommendations. Dollar value is only one metric to assess the importance of an ...