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Yuri Milner (DST Global)

In 2009, Yuri Milner's DST Global paid $200 million for a nearly 2 percent stake in Facebook, a deal that, at that time, brought Facebook’s value to $10 billion. Milner went back for more, getting in on Goldman Sachs’ 2011 investment, putting up an additional $50 million of his own money. Along with earlier, large-block purchases of Facebook stock from existing shareholders and employees, DST's stake stands at 5.5 percent which is worth about $4.6 billion.
Along with Facebook, Milner's investments include Twitter, Groupon, Zygna, Airbnb and Spotify.

Photo: Digital Sky Technologies