The stark truth for Broadcom is that there has been more insider selling than insider buying in the last three months. And our longer term analysis of insider transactions didn't bring confidence, either. It is good to see high insider ownership, but the insider selling leaves us cautious. While we like knowing what's going on with the insider's ownership and transactions, we make sure to also consider what risks are facing a stock before making any investment decision. To help with this, we've discovered 3 warning signs (1 makes us a bit uncomfortable!) that you ought to be aware of before buying any shares in Broadcom.