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The Winklevoss twins
The Winklevoss twins

Cameron and Tyler Winklevoss are best known for filing a giant lawsuit against Facebook founder Mark Zuckerberg and Facebook, claiming Zuckerberg stole his idea for the social network from their site, ConnectU. The battle began in 2004 and went on until 2008, when a cash-and-stock settlement deal was struck. (Even then, the appeals dragged on for another three years.)

The twins were granted 1.2 million Facebook shares in a deal valued at the time at around $65 million. Thanks to a five-for-one stock spilt, they're now sitting on 6 million shares -- a $228 million windfall.

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.