Carter Lyons is co-chief executive of Two Sigma, the New York quantitative investment firm, a role he has held since September 2024 and one that is now the subject of a dispute between the firm's founders.
Carter Lyons is co-chief executive of Two Sigma, the New York quantitative investment firm, a role he has held since September 2024 and one that is now the subject of a dispute between the firm's founders.
Lyons joined Two Sigma in 2011 as Head of Investor Relations, later became Co-Head of Two Sigma Advisers and then Chief Business Officer. Before Two Sigma he was a managing director at BlackRock in the Global Client Group's US and Canadian institutional team, and he held leadership roles at Barclays Global Investors and Franklin Templeton.
When co-founders John Overdeck and David Siegel stepped down as co-CEOs, Lyons and Scott Hoffman, a former chief administrative officer and general counsel of Lazard, took over on 30 September 2024. Overdeck had picked Lyons for the role. Hoffman resigned in early 2026, citing governance challenges.
In March 2026 Siegel designated Seth Platt as his executive manager on the firm's management committee. Platt then moved to terminate Lyons, and Overdeck placed the termination into dispute resolution, so it cannot take effect without management committee agreement or arbitration, according to the firm's Form ADV, which lists Lyons as Co-Chief Executive Officer. In October 2026 Platt said he would leave once a successor is appointed. Two Sigma Investments, LP's 13F for June 2026 listed about $138 billion of US-listed securities, including options.
Sources · written 23 October 2026