Two Sigma executive to exit amid ongoing founders' dispute

Two Sigma Investments is grappling with another senior leadership change as Seth Platt prepares to depart the $85 billion hedge fund amidst an ongoing governance dispute between co-founders David Siegel and John Overdeck, Bloomberg reported. Platt, who sits on the firm's two-person management committee as Siegel's representative, has requested a replacement be found once appointed.

His exit will necessitate Siegel selecting a third representative within roughly two years. This leadership shift follows months of disagreements over Platt's role as co-CEO alongside Carter Lyons, appointed by Overdeck. Siegel and Overdeck, founders of Two Sigma in 2001, stepped down as co-CEOs in 2024 due to escalating tensions, a risk previously disclosed in a 2023 regulatory filing.

Initially, Siegel appointed Scott Hoffman, a former Lazard general counsel, as his representative, while Overdeck chose Lyons. Overdeck later rejoined the management committee, and Hoffman resigned in March 2026 due to persistent governance issues. Platt was subsequently appointed to fill the void. Despite leadership instability, Two Sigma has posted impressive investment performance, with its Absolute Return Enhanced Fund gaining 16% through September.

The firm anticipates 2026 to be one of its strongest years. Platt will retain his roles as chief investment officer and chief operating officer of Siegel's family office post-leave. Siegel's family office spokesperson confirmed co-founder Siegel has no intention of returning to daily management of the hedge fund, with a search underway for Platt's successor.