With more than 2.5 billion users, Facebook Inc. (NASDAQ: FB) is the most popular social networking site worldwide and also one of the most rewarding technology sector stocks for investors, generating 383% return since its IPO, as of April 16, 2018 (not accounting for reinvested dividends). The company's market capitalization is close to $500 billion — it was the fastest company in history to reach a market cap value of $250 billion, achieving that mark within just three years of its initial public offering (IPO). Facebook is a component of both the NASDAQ 100 Index and the Standard & Poor's 500 Index (S&P 500).

Facebook stock is widely held by large institutional investors, mutual funds and ETFs. The individual Facebook shareholders with the largest amount of Facebook stock are all present or former key figures at Facebook. All data is based on the company's latest proxy filing. A fact to note is that, Class A shareholders have one vote for each share while those with Class B shares have ten votes for each share held.

Mark Zuckerberg

The founder and "face" of Facebook holds around 8.78 million in Class A Facebook stock in a series of funds held with his wife, Prisciclla Chan, as of his March 31, 2018, SEC filing. Zuckerberg also owns a whopping 441.6 million Class B shares. Control over nearly 89% of the Class B shares,  gives Zuckerberg 60% voting rights in the compnay. Mark Zuckerberg started Facebook in his Harvard dorm room, and has become one of the most famous businessmen in the world. Zuckerberg and Facebook have come under fire in the Cambridge Analytica scandal where it was revealed that the latter accessed user data and used it to target political advertisements. Zuckerberg in a written statement before the House admitted that the company had not done enough to protect its users.

Dustin Moskovitz

Another Facebook founder, Moskovitz, holds about 48 million Class B shares. It is interesting, however, to note that he has a voting agreement on these shares in favor of Zuckerberg that the proxy counts among the latter's voting rights. The filing also notes that Moskovitz did not respond to the company's request to disclose his ownership of Class A shares and accounts for no such shares in his name based on information available. Moskovitz left Facebook in 2008 and went on to found, Asana, a workflow management software company. Moskovitz was named the 'youngest self-made billionaire' by Forbes Magazine in 2011.  

Eduardo Saverin

Brazilian entrepreneur and now investor, Eduardo Saverin, was also a founding member of the social network. The proxy filing gives Saverin 6.06 million Class A shares of the company along with 47.2 million Class B shares that account for 6.5% voting power. Saverin, once leading the business side of the company was edged put of the company with his stake diluted by Zuckerberg in 2005, reported Business Insider. The spat made infamous in the movie, was reportedly resolved when a lawsuit filed by Saverin was settled out of court. He also made headlines when he renounced his US citizenship ahead of the Facebook IPO, a move that would have helped him save on taxes.

Jan Koum

With an estimated net worth of more than $10 billion, Jan Koum holds 14.2 million Facebook Class A shares, according to the April 2018 proxy filing.

Koum, a true rags to riches story and an immigrant from the Ukraine, survived on his mother's disability income and food stamps until he secured a job as a security and infrastructure engineer at Yahoo Inc. (NASDAQ: YHOO) in 1998. After working under the tutelage of Yahoo co-founder David Filo, for nine years, Koum left the company in 2007, and in 2009, he designed and launched the WhatsApp mobile messaging service. WhatsApp was acquired by Facebook in 2014 for approximately $22 billion, at which time Koum obtained a seat on Facebook's board of directors.

Sheryl Sandberg

Sheryl Sandberg, with 1.5 million shares held indirectly through a trust, comes in next. She also holds 2 million Class B shares of the company. Sandberg has held the position of chief operating officer (COO) at Facebook since 2008. Prior to joining the company, Sandberg's experience included serving as chief of staff to U.S. Treasury Department Secretary Larry Summers, being vice president of global online sales and operations for Google, and working as an economist for the World Bank. Sandberg earned an MBA degree from Harvard Business School and is the author of the book, "Lean In: Women, Work, and the Will to Lead."

Michael Schroepfer

Michael Schroepfer has a total of 990,725 Class A shares of Facebook and another 716,987 Class B shares of the company. Schroepfer came aboard at Facebook in 2008 as vice president of engineering. Since 2013, he has been the company’s chief technology officer, tasked with managing and developing the vast technological infrastructure that supports the heavy traffic Facebook site. Schroepfer earned a bachelor’s and master’s degree in computer science at Stanford University.

Main Institutional and Mutual Fund Shareholders

The largest institutional shareholder of Facebook stock is Vanguard, with a reported 169.8 million or 7.1% Class A in the company as of March 31, 2018. Blackrock follows next with 146 million or 6.1% Class A shares and Fidelity with 122.5 millions or 5.1% of Class A shares in at the end of Q1 2018.

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