Here's what investors need to know.Wolfspeed (WOLF) stock has seen some major changes in the last couple of days. Some investors were jumping for joy when they saw reports that the stock had jumped more than 1,600% yesterday, only to find that when they checked their portfolios, they were down -- a lot. So what's going on?Shareholder dilutionThe struggling chipmaker filed for Chapter 11 bankruptcy protection on June 30 this year after its debt grew unmanageable. The company successfully negotiated a massive ...