Without a prenup, Two Sigma growth can face equitable distribution
The divorce trial between Two Sigma co-founder John Overdeck and his estranged wife Laura has unfolded for months in a Newark, N.J., courtroom. To lawyers and other advisers, the case reads like a textbook example of how that wealth can come back to bite, especially when founders and other business owners do not take steps to protect their companies.
John Overdeck proposed to Laura Overdeck in March 2002, a month before Two Sigma started investing with over $20 million in capital. By the time they married later that year, Two Sigma’s assets under management had climbed to about $350 million. The couple did not sign a prenuptial agreement.
Lisa Zeiderman, a New York divorce attorney, said the absence of a prenup has left John Overdeck exposed. “How many times is he kicking himself now?” she told the Journal. “Everyone knows what everyone’s pressure points are in a divorce. It’s a very dangerous place to be.”
Divorce attorneys said a prenup could have begun with the simple term “the marital estate shall not include any interest in the business.” Laura Chickering, managing attorney at Fenchel Family Law in San Francisco, has recently been writing similar terms into prenups for founders of AI businesses. “When the business is small, but you have an inkling that you don’t know what the potential upside is, that is the best time to sign a prenup,” she said.
Chickering tells founders to be prepared to negotiate and to make concessions. A founder might agree to give up a home or another valuable asset in exchange for excluding the business from the marital estate in the event of divorce. She recommends their salary remain a marital asset to show that the marital estate is receiving a benefit from their employment.
In New Jersey, as in other states, the growth of a business during a marriage can be subject to equitable distribution even if it was founded before the marriage, unless otherwise specified in a prenup. That rule is central to Laura Overdeck’s claim that she is entitled to a portion of Two Sigma.
The parties disagree sharply over the value of John’s stake. John has argued it is worth $4.5 billion, while Laura has said it is worth $6.2 billion. A valuation expert hired by John testified that the stake was worth $50 million at the time of their marriage. Laura’s side disputes that valuation and has argued that John’s Two Sigma equity did not vest until well after the marriage.
Divorce lawyers said clear documentation of a business’s value and the founder’s ownership stake before marriage can reduce some valuation gamesmanship if a once-happy couple later become adversaries. John testified that he had control over setting his own salary, a common trait among business owners that can open them up to scrutiny in a divorce. Lawyers said an owner could be accused of intentionally underpaying themselves to withhold money from the marital estate.
Third parties can help determine market-rate compensation, while careful records can document how that compensation was determined. Robert Romanoff, a trust and estates lawyer at Levenfeld Pearlstein in Chicago, said he has included provisions in premarital agreements requiring a business-owning spouse to commission a compensation study. “Should they make a change to their compensation upward if they’ve been underpaid?” Romanoff said. “You need to plan ahead of major life events.”
Until around 2023, Two Sigma operated a multifamily office that managed the money of both John Overdeck and David Siegel. Two Sigma employees provided personal services to John during that time, according to court testimony. John also testified that he had a conversation with Matthew Siano, then Two Sigma’s general counsel, about removing Laura from their family foundation. Because Siano was representing Two Sigma and not John, the judge denied John’s attempt to claim attorney-client privilege.
People who work with family offices said the lines between business and personal matters are often blurred. “That’s the nature of the vast majority of family offices,” said David Handler, a trust and estates lawyer at Kirkland & Ellis. “It’s informal.”
Handler said asking an employee to get involved in personal affairs puts a strain on that person and creates the potential for conflicts of interest. The employee could end up doing something that helps their boss at the expense of other family members or shareholders.
Kimberly Valentine-Poska, a former Deloitte partner who has served on the boards of public companies, private companies and family offices, said family offices should have separate advisers, keep clear records and be transparent by providing regular reports to all members of the family. She said family-office board work involves a closer working relationship with the owners than a public company, because she is helping to put governance in place and educating shareholders.
“You have to go in and set up a family office like it’s its own business,” Valentine-Poska said.
The outcome of the trial could also bear on the contest at Two Sigma, where John Overdeck has been engaged in a long-running dispute with his co-founder, David Siegel. The case has exposed information about compensation, ownership and company operations while that separate contest continues.
The Wall Street Journal connected the case to a broader trend in entrepreneurship. Business formation so far in 2026 is happening at the fastest pace in years, according to Census Bureau data, thanks in part to artificial intelligence-driven innovation. The Overdeck case concerns a missing prenup, competing stake valuations, owner-controlled compensation and unclear boundaries around a family office. Lawyers and other advisers cited prenup exclusions, pre-marriage valuation records, compensation studies and formal family-office governance as ways to address those issues.