BlackBerry Ltd (NYSE: BB) had a tremendously strong day in the market yesterday, gaining more than 30% by the closing bell. The company released news that it would be participating in an upcoming investor conference, but that doesn’t explain such a dramatic run. So, what’s the deal? I’ve talked about AMC quite a bit, pointing to the manipulation by hedge funds and the short squeeze retailers pushed for that handed the funds significant losses. However, hedge fund manipulation isn’t going to focus on a single stock.