“The biggest fund in the world now is wallstreetbets in terms of its ability to move markets,” said one baffled hedge fund manager. “They are super confident and they use leverage." The professionals have been left reeling by what some see as predatory behaviour. They point out that if they co-ordinated on Bloomberg chat messages in the same way that amateurs gang up on certain stocks, they would face regulatory action. And professional short-sellers know they are now wearing targets on their backs.