Continued from page 1

At that price, the nearly 534 million shares that the 27-year-old Zuckerberg owns are worth about $16 billion. The filing indicates Zuckerberg will sell an unspecified number of shares in the IPO to cover a tax bill for exercising a stock option to buy 120 million shares. Zuckerberg has been collecting a $500,000 salary but that will fall to one dollar next year at his own request, according to the filing.

Other big winners in the IPO include: Facebook co-founder and old Zuckerberg friend, Dustin Moskovitz, who owns nearly 134 million shares; venture capital firm Accel Partners, which owns 201 million shares; Russian investor DST Global Ltd., which owns 131 million shares; and former PayPal CEO Peter Thiel, who owns nearly 45 million shares.

Hundreds of other Facebook employees could become millionaires because they receive stock as part of their compensation. Facebook has about 3,200 employees now, nearly 2,000 more than it did two years ago.

Facebook also shared some of its biggest worries in the filing. Among other things, it cited Google’s ability to use its dominance in Internet search to promote its Google Plus social network. Facebook also frets the possibility that regulators in Europe and the U.S. may impose tougher privacy rules that would make it more difficult for the company to stockpile information about its users.