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Two Sigma lost major investor amid founders’ long-running dispute

Reported by Hedgeweek ·Opalesque ·Bloomberg +1 more
Aug 20, 2026· 2 min read
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Key Takeaways
  • • Two Sigma lost a major investor in 2023 amid the long-running dispute between co-founders John Overdeck and David Siegel, according to a Bloomberg report citing Overdeck's testimony in his divorce proceedings.
  • • Overdeck said the founders' fallout raised client concerns about the firm's governance and ability to operate as expected, and warned that public disclosure of the disputes could prompt other large investors to reconsider allocations.
  • • A person familiar with the matter confirmed the unnamed investor withdrew in 2023; Overdeck said the firm subsequently replaced the client.
  • • Two Sigma's assets under management have climbed to a record of more than $75bn, and the firm continues to raise money for new investment vehicles.
  • • Two Sigma identified the dispute as a material business risk in 2023; both co-founders have stepped away from senior executive roles, and the disagreements have moved into arbitration.
Summary
Two Sigma Investments lost a major investor in 2023 amid the prolonged dispute between billionaire co-founders John Overdeck and David Siegel, according to a Bloomberg report citing testimony from Overdeck in his ongoing divorce proceedings. Overdeck disclosed the departure while giving evidence at his matrimonial trial in New Jersey, where his wife, Laura Overdeck, is seeking a share of his stake in the quantitative hedge fund firm.

Overdeck testified that the fallout between the founders had raised concerns among clients about Two Sigma's governance and its ability to operate as expected. He also warned that making details of the partners' disputes public could prompt other large investors to reconsider their allocations. A person familiar with the matter confirmed that the unnamed investor withdrew in 2023. Overdeck said the firm subsequently replaced the client, and Two Sigma's assets under management have since climbed to a record of more than $75bn while the firm continues raising money for new investment vehicles.

Two Sigma reportedly declined to comment on Overdeck's testimony. The dispute between Overdeck and Siegel has persisted for years and was formally identified by Two Sigma as a material business risk in 2023. The co-founders have also taken their disagreements into arbitration. Both men stepped away from senior executive positions at the firm, although Overdeck later returned to its management committee.

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Sources

4 outlets

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

Hedgeweek Two Sigma lost major investor amid founders’ long-running dispute Opalesque Two Sigma lost major investor in founders feud, Overdeck says Bloomberg Two Sigma Lost ‘Major Investor’ in Founders’ Feud, Overdeck Says Crypto Briefing Two Sigma Investments loses major investor amid co-founder feud