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A $6 Billion Divorce Fight Is Threatening To Expose Two Sigma’s Secrets

Reported by Thewealthadvisor
Oct 13, 2026· 3 min read
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Key Takeaways
  • • A New Jersey Family Court judge, Bruce Buechler, agreed to close portions of a hearing in the $6 billion Overdeck divorce case after Two Sigma co-founder John Overdeck argued that testimony on valuing his firm could expose proprietary strategies.
  • • Overdeck's lawyers value his roughly one-third stake in the $80 billion hedge fund Two Sigma at approximately $4.5 billion, while Laura Overdeck's side puts it at $6.2 billion, a $1.7 billion gap.
  • • Laura Overdeck is seeking 35% of her husband's stake, and she has already rejected an offer exceeding $600 million, according to the article.
  • • Buechler rejected a request to seal the entire testimony of financial expert Todd Povlich, drawing a line between publishing a valuation and revealing investment positions and internal models.
  • • The court's ruling protects Two Sigma's intellectual property for now but does not resolve the valuation dispute or the division of the fortune.
Summary
Billionaire hedge fund founder John Overdeck has won a partial victory in New Jersey's largest contested divorce case, persuading Family Court Judge Bruce Buechler to close portions of a hearing that could expose the inner workings of his $80 billion firm, Two Sigma. His estranged wife, Laura Overdeck, is seeking a share of his company stake, and determining that stake's value has brought the dispute close to revealing the firm's proprietary financial information, according to the report.

Buechler rejected Overdeck's request to seal the entire testimony of financial expert Todd Povlich but agreed that sensitive portions should be heard behind closed doors. The judge was concerned that explaining how Two Sigma's businesses are valued could reveal investment strategies that competitors might exploit. The distinction matters because the stake is not a readily priced portfolio of public securities. Overdeck owns roughly one-third of Two Sigma, which he co-founded in 2001 with David Siegel and another partner. His lawyers value the interest at about $4.5 billion, while Laura's side values it at $6.2 billion.

Laura, 56, is seeking 35% of the stake, arguing that the business represents marital wealth built during the couple's two decades together. The couple married in 2002 without a prenuptial agreement, had three children, and separated in 2022. Laura has rejected an offer exceeding $600 million, and her lawyers contend that her husband spent years structuring his affairs to minimize what she could receive. Those allegations remain contested. Laura's attorney, Theresa Lyons, questioned why the valuation testimony needed to remain confidential once the parties had disclosed competing estimates.

The case has produced further complications. Buechler previously barred Laura from testifying after allegations that she improperly accessed her husband's electronic communications and mail and deleted evidence from her phone, though her lawyers can still cross-examine his financial evidence. The divorce also coincides with a separate struggle between Overdeck and co-founder David Siegel over management and control of Two Sigma.

The hearing is expected to continue with additional financial testimony, and the ultimate division of the fortune remains unresolved. The closed-door ruling gives Overdeck protection against public disclosure but is not a finding that his valuation is correct or that Laura has no claim to the company.

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Sources

1 outlet

AlphaMaven summarised this story from the reporting below. Each link opens the original article.

Thewealthadvisor A $6 Billion Divorce Fight Is Threatening To Expose Two Sigma’s Secrets