John Overdeck, co-founder of Two Sigma Investments, says his long-running feud with his business partner is driving away clients. During testimony in a divorce case, Overdeck said a major investor pulled out after his falling-out with David Con Siegel, the other co-founder. He made the comments on Aug. 12 while arguing about whether to seal trial records, including Two Sigma's original business agreements.
The investor left in 2023, according to a person familiar with the matter. Two Sigma declined to comment on the testimony. Overdeck said he was concerned that public disclosure of disputes or arbitration among colleagues would make large investors question the company's stability. "I am concerned that the company would consider reducing their investments," he said.
The investor's departure highlights the broader challenges facing the firm as it continues to deal with the founders' conflict. The feud, long an open secret in the financial industry, has now spilled into public view through divorce proceedings.
The conflict between the two men is not new. In 2023, Two Sigma disclosed it as a material risk to its business. Both founders entered into arbitration and stepped back from top executive roles. Now the personal relationship between them is part of a court case that could affect ownership of the firm.
John Overdeck is the one in the divorce trial, not his business partner. Laura Overdeck wants part of his Two Sigma stake. Her lawyer, Theresa Lyons, said John planned to give her only $633 million despite his earning more than $10 billion in the nine-year period. She is asking for 35% of his stake, which she says is worth $6.2 billion.
John Overdeck's lawyer, Jonathan Wolfe, said his client offered $723 million in taxable property. The defense argues that Two Sigma was founded almost two years before her wedding. His team says the stake is separate. Laura's team says the company was barely more than an idea when they married.
The trial is before Judge Bruce Buechler in New Jersey, without a jury. The judge will rule after the trial, which is still ongoing as of Aug. 19, 2026. Laura's lawyers say it is the largest divorce case in New Jersey history.
The decision could affect Two Sigma's future. If the court gives Laura part of the stake, a new owner with different goals may become involved. The proceedings also highlight the personal risks of owning a major financial business.
Even now, Two Sigma manages $75 billion, a record. It remains focused on clients and performance despite the drama. But the conflict between the two founders continues to be a concern.
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