The Nasdaq dropped by more than 100 points on Monday. Investors, meanwhile, focused on some notable insider trades. When insiders sell shares, it indicates their concern in the company's prospects or that they view the stock as being overpriced. Either way, this signals an opportunity to go short on the stock. Insider sales should not be taken as the only indicator for making an investment or trading decision. At best, it can lend conviction to a selling decision. Below is a look at a few recent notable insider sales. For more, check out Benzinga's insider transactions platform. Uber ...