Individual investors are apparently fueling the increase. It's a similar strategy to what we've seen with GameStop stock.
In this documentary, director Jed Rothstein follows several acitivist investors who blew the whistle on dozens of fraudulent Chinese companies.
Stocks have posted steady gains, which means traders betting against them aren’t happy.
Stocks for trendy companies slowed down significantly in March
Short selling has a bad rap. But it's been around as long as the markets have.