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The investors
The investors

Next to Mark Zuckerberg, Facebook's biggest shareholder is Accel Partners, a venture capital fund led by Jim Breyer (pictured above). He led the company's $12 million investment round in Facebook in 2005. Accel's stake is now worth more than $7 billion -- and it's cashing out. Accel plans to collect nearly $2 billion from selling shares in Facebook's IPO.

Other investors will also hit the jackpot. Silicon Valley "angel" investor Peter Thiel put up $500,000 to get Facebook through its first summer of operations. His 2.5% stake in Facebook is now worth around $1.7 billion. Investment firm DST Global holds a Facebook stake worth almost $5 billion.

Source: Facebook SEC filings and CNNMoney reporting. All stakes are based on pre-IPO holdings, calculated at $38 per share.
By Laurie Segall and Stacy Cowley @CNNMoneyTech - Last updated May 18 2012: 2:59 PM ET
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$38 is the magic number

Facebook's IPO will raise $16 billion, making it the third-largest IPO in U.S. history.