The lawsuit between the Facebook co-founders never reached a verdict. Eduardo Saverin sued Mark Zuckerberg in 2004 after his ownership stake was diluted from roughly 30 percent down to about 0.03 percent, and the case settled confidentially in 2009. Saverin’s co-founder title was formally restored, and his stake was reset to an estimated 4 to 5 percent of the company. Modest on paper. Worth billions once Facebook went public in 2012.
How the Partnership Started
Zuckerberg and Saverin launched Facebook together as Harvard undergraduates in early 2004. Zuckerberg built the site. Saverin, who had a finance background, put up roughly $18,000 in seed money and served as the company’s first chief financial officer. That investment gave him about a one-third stake, which settled at around 30 percent once classmate Dustin Moskovitz joined the founding team.
The arrangement held for a few months. Facebook spread from Harvard to other Ivy League campuses and then to colleges nationwide. But the founders’ visions split. Zuckerberg moved to Palo Alto in the summer of 2004 to run the company full-time. Saverin stayed on the East Coast, working on his own projects and an internship in New York. That split became the fault line for everything that followed.
How Saverin’s Stake Was Diluted
The dilution happened in stages through corporate maneuvers that were technically legal but, Saverin argued, deliberately designed to push him out.
In July 2004, Zuckerberg incorporated a new Delaware corporation to replace the original Florida LLC. When Peter Thiel invested $500,000 for a 9 percent stake that September, the new share structure reduced Saverin from roughly 30 percent to about 24 percent. Zuckerberg retained 40 percent, and Moskovitz’s share increased to 16 percent. Saverin’s number dropped while the other founders were protected or improved.
On October 31, 2004, Saverin signed an agreement that gave up his voting rights and left him with a fixed number of shares rather than a protected percentage. Then on January 7, 2005, Zuckerberg issued more than 9 million new shares of common stock, distributing them to himself, Moskovitz, and Napster co-founder Sean Parker, who had become Facebook’s president. Because Saverin held a fixed number of shares with no anti-dilution protection, the issuance crushed his ownership from about 24 percent to below 10 percent almost instantly. By the time a second round of venture capital financing closed, his stake had been diluted to roughly 0.03 percent, while other existing investors saw minimal dilution.1Vanderbilt Law Review. Zuckerberg, Saverin, and Venture Capitalists’ Dilution of the Crowd
Internal communications later showed the dilution was not accidental. Zuckerberg reportedly asked his lawyer whether there was “a way to do this without making it painfully apparent” that Saverin was being diluted. The lawyer warned that because Saverin was the only shareholder being diluted, there was “substantial risk” he could claim a breach of fiduciary duty.
What Each Side Alleged
Saverin sued in 2004, alleging that Zuckerberg, Parker, and other Facebook insiders had conspired to freeze him out and destroy his ownership stake. His core claims: the dilution was intentional and unfair, Zuckerberg had used company funds (partly Saverin’s investment) for personal expenses, and the corporate restructuring was designed specifically to strip his equity while preserving everyone else’s.
Facebook counterclaimed that Saverin had breached his own fiduciary duty to the company. The central allegation was that Saverin froze Facebook’s bank account after feeling excluded from operations, starving the company of operating funds during a critical growth period. Officers and directors of a corporation owe duties of loyalty and care to the company and its shareholders, and both sides accused the other of violating those obligations.2Legal Information Institute (LII) / Cornell Law School. Fiduciary Duty
Both sides had leverage and exposure. Saverin’s dilution story was sympathetic and backed by damaging internal emails. Facebook’s counter-story painted him as someone who endangered the company he co-founded out of personal frustration.
How the Case Settled
The parties reached a confidential settlement in 2009 rather than risk a trial. The precise financial terms have never been made public, which is standard in high-stakes corporate disputes. Settlements of this type typically include confidentiality provisions and non-disparagement clauses that prevent either side from discussing the terms or publicly criticizing the other.
What is known: the settlement restored Saverin’s stake to an estimated 4 to 5 percent of Facebook, a dramatic recovery from 0.03 percent. It also formally reinstated his title as a co-founder. That recognition mattered because Zuckerberg’s camp had at various points attempted to minimize or erase Saverin’s role in the company’s origin story.
For Facebook, settling removed a litigation cloud as it prepared for explosive growth and an eventual public offering. For Saverin, the deal turned what looked like a total wipeout into one of the most valuable minority stakes in tech history.
Renouncing U.S. Citizenship Before the IPO
In September 2011, roughly eight months before Facebook’s IPO, Saverin renounced his U.S. citizenship. He had been living in Singapore, which does not impose a capital gains tax. Critics suggested the move was designed to avoid a massive tax bill when Facebook went public. Saverin’s representatives said the decision was practical, not tax-motivated, and that he planned to live in Singapore indefinitely.
The financial implications were significant either way. The U.S. imposes an “exit tax” on wealthy individuals who give up citizenship. A person is treated as a “covered expatriate” if their net worth is $2 million or more, or if their average annual net income tax over the previous five years exceeds a specified threshold.3Internal Revenue Service. Expatriation Tax Covered expatriates face a mark-to-market regime that treats all their property as sold at fair market value on the day before expatriation. By expatriating before the IPO, the fair market value of Saverin’s shares was likely assessed at a pre-IPO private valuation rather than the post-IPO market price. Facebook went public in May 2012 at $38 per share, valuing the company at roughly $104 billion.
Where the Co-Founders Stand Today
Saverin’s roughly 4 to 5 percent stake in what became Meta Platforms has made him one of the wealthiest people in the world. Forbes estimates his net worth at approximately $29.3 billion as of early 2026.4Forbes. Eduardo Saverin Profile He lives in Singapore and co-founded B Capital, a venture capital firm with more than $7 billion in assets under management that invests in early and growth-stage technology companies.5B Capital. Eduardo Saverin
Zuckerberg remains CEO of Meta Platforms, with a 2026 net worth Forbes places at roughly $222 billion. The gap between their fortunes reflects the difference between holding a diluted minority stake and controlling the company, but both men became extraordinarily wealthy from the same venture.
What Founders Take from the Dispute
Startup lawyers reference the case constantly. Saverin’s biggest mistake was structural. He accepted a fixed number of shares with no anti-dilution protections, gave up his voting rights, and stepped away from day-to-day operations while his co-founder controlled the board. Any one of those factors would have weakened his position. Together, they made the dilution almost inevitable.
Venture capitalists negotiating similar deals routinely secure anti-dilution clauses, board representation, and protective provisions that prevent what happened to Saverin. He had none of those safeguards because he was a college student funding a dorm-room project, not a professional investor negotiating term sheets.1Vanderbilt Law Review. Zuckerberg, Saverin, and Venture Capitalists’ Dilution of the Crowd
The other lesson is about settlement math. Saverin’s diluted 0.03 percent stake was essentially worthless in practical terms. His lawyers negotiated it back up to 4 or 5 percent of a company that would soon be worth over $100 billion. In raw financial terms, settling may have been the single most lucrative decision of his life, even though it meant accepting a fraction of what he once held.