The majority of Zuckerberg's fortune is derived from a stake of about 13% in Meta Platforms, formerly Facebook, based on a July 2025 filing.

Facebook is the world's largest social network. Meta Platforms has about 3.4 billion daily users, according to a January 2025 company presentation. The company sold shares in an initial public offering on May 17, 2012 in what was the biggest technology IPO in history at the time.

The billionaire owns the shares through a series of trusts and holding companies, according to the company's proxy statement. He plans to give away 99% of his shares over his lifetime, according to a December 2015 SEC filing. Zuckerberg started selling shares in August 2016 to fund his philanthropy and in Bloomberg's calculation he isn't credited with the value of any sales proceeds that fund charitable work. He's still credited with those shares he plans to give away because he still owns them.  

The value of his cash investments is based on an analysis of insider transactions -- mostly the sale of shares valued by an analysis of Bloomberg data and company filings -- as well as taxes, property purchases, philanthropic giving and market performance. 

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USPTO Data Jan 1 1976 - Oct 21 2025

74 Utility and 30 Design Patents

Mark E Zuckerberg