An interesting case for classes. From Fortune:
"In September 2009, Silver Lake Partners and venture firm Andreessen-Horowitz bought Skype from eBay, where it had become the Kurt Cobain of technology companies (wildly popular, deeply troubled). The value of that deal: $2.75 billion.
In May 2011 the new owners announced that they were selling the company to Microsoft for $8.5 billion.
Voilà! Six billion bucks in less than two years."