Two Sigma Loses Major Investor During Founders’ Dispute

John Overdeck testified in his New Jersey divorce trial that a major investor withdrew from Two Sigma in 2023 because of a public dispute with co-founder David Siegel. Court testimony tied the exit to client concerns about governance and the firm’s ability to operate while the founders’ conflict continued.

Overdeck gave the testimony during proceedings in which his wife, Laura Overdeck, is seeking a share of his stake in the quantitative hedge fund. He warned that further public disclosures about the partners’ disagreements could prompt other large investors to reevaluate their allocations. A person familiar with the matter confirmed the investor withdrew in 2023. Overdeck told the court that the firm later replaced that client.

Two Sigma’s assets under management have climbed to more than $75 billion since the 2023 exit, and the firm continued raising money for new investment vehicles after the withdrawal. Two Sigma declined to comment on the testimony.

The dispute between Overdeck and Siegel has persisted for several years. The company listed the disagreement as a material business risk in 2023. The co-founders have taken parts of the dispute to arbitration. Both men stepped away from senior executive roles at the firm; Overdeck later returned to the management committee.

Court filings and testimony identified client questions about leadership stability as a factor in at least one large investor’s decision to withdraw capital.