No. 3

Andrew Harrer/Bloomberg

No. 3

Reid Hoffman, 42
Chairman, co-founder, LinkedIn
Reid Hoffman’s LinkedIn profile

No. of Angel Investments: 49
Companies funded (a sampling): Digg, Facebook, Flickr, Friendster, Ning, Zynga

Reid Hoffman has one of the hottest angel portfolios in Silicon Valley. He’s an investor in Facebook and Zynga, two companies said to have hit the $1 billion valuation mark. Other investments, such as Flickr, Last.fm, and IronPort Systems, have been sold to Yahoo! ($35 million), CBS ($280 million), and Cisco ($830 million). His professional social network LinkedIn, which recently reached 60 million members, is a strong IPO candidate—and another company said to have a $1 billion valuation. In November, Hoffman joined VC firm Greylock Partners. That’s in addition to his current LinkedIn gig.