Although U.S. stocks closed slightly higher on Friday, there were a few notable insider trades. When insiders purchase shares, it indicates their confidence in the company’s prospects or that they view the stock as a bargain. Either way, this signals an opportunity to go long on the stock. Insider purchases should not be taken as the only indicator for making an investment or trading decision. At best, it can lend conviction to a buying decision. Below is a look at a few recent notable insider purchases. For more, check out Benzinga’s insider transactions platform. STAAR Surgical The Trade: ST…