Author: Billy Duberstein, The Motley Fool

The billionaire investor recently revealed his thinking on JPMorgan’s stock, along with a rough idea of what it’s worth.

One way to find potential buying opportunities in the stock market is to pay attention to insider purchases. It’s not always a guarantee of good things to come, but when insiders decide to purchase shares themselves (as opposed to just holding the stock they receive in compensation), it should get investors’ attention. That said, insiders showed their confidence in AT&T at the end of July. Could this enthusiasm signal a turnaround?