Running a $70 billion hedge fund is hard enough without your co-founder becoming your adversary. John Overdeck, who co-founded Two Sigma Investments alongside David Siegel in 2001, disclosed during his divorce trial on August 19 that the firm lost a major investor as a direct consequence of the bitter rift between the two men.
A feud that became a regulatory disclosure
Two Sigma first flagged the deteriorating relationship to its investors back in March 2024, categorizing the co-founders’ disputes as a material risk to the business. By August 2024, the situation had escalated to the point where both founders stepped down as co-CEOs. Carter Lyons and Scott Hoffman were installed as their replacements.
Arbitration proceedings kicked off in January 2025, with the disputes centering on governance and compensation issues between Overdeck and Siegel.
The cost of internal warfare
Overdeck’s courtroom statement that Two Sigma lost a major investor because of the feud puts a concrete, if unnamed, price tag on leadership dysfunction. The identity of the departing investor hasn’t been disclosed, nor has the size of the redemption.
Two Sigma’s overall assets under management have remained relatively stable at around $70 billion throughout the entire saga.
Quant giant, very human problems
Two Sigma has long positioned itself as a technology company that happens to trade financial markets. Founded in 2001, the firm grew into one of the largest and most sophisticated quantitative hedge funds in the world.
The installation of Lyons and Hoffman as co-CEOs was meant to provide a clean break, and the firm has continued to operate and maintain its asset base through the conflict. The firm’s ability to hold $70 billion in AUM through this period is notable, but the arbitration between Overdeck and Siegel remains unresolved more than two years after the disputes first surfaced publicly.
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