(Bloomberg) Facebook Inc. (FB)’s $11.8 billion initial public offering will cement the status of 27-year-old Mark Zuckerberg as one of the world’s richest men and put his social network among the highest-valued companies in the U.S.

Facebook is offering about 337.4 million shares for $28 to $35 each, according to a regulatory filing today. At the upper end of that range, the co-founder’s stake would be $17.6 billion, making him richer than Microsoft Corp.’s Steve Ballmer and Russian steel billionaire Vladimir Lisin, who are both twice his age, according to the Bloomberg Billionaires Index.

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