Two Sigma Investments loses major investor amid co-founder feud

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 rela...