Bono & Elevation Partners: $750 Million
U2's front man, Bono, cofounded Elevation Partners in 2004. Five years later, the private equity firm reportedly made its first investment in Facebook, spending $90 million to acquire about 1 percent of the company. A few months later, Elevation Partners upped the ante, spending $120 million for an additional 5 million shares of Facebook.
Today, its $210 million investment—or 1.5 percent stake—could earn them about $750 million.