Brazilian cowboy Cassio Dias is now at the top of the global rankings. Dias, who is just 22 years old, has been unstoppable this season, and the veteran bull riders in PBR are yet to outshine him.

Let's take a look at what these Wall Street heavyweights have to say about Petrobras (PBR) before we discuss the reliability of brokerage recommendations and how to use them to your advantage.