Antithesis: $105 Million Series A Raised For Advancing Deterministic Simulation Testing
By Amit Chowdhry ● Dec 10, 2025
Antithesis has raised a $105 million Series A funding round led by Jane Street, marking a significant step in the company’s effort to make deterministic simulation testing a core component of modern software reliability. The round includes participation from Amplify Venture Partners, Spark Capital, Tamarack Global, First In Ventures, Teamworthy Ventures, Hyperion Capital, and individual investors such as Patrick Collison, Dwarkesh Patel, and Sholto Douglas, as well as other new and returning backers. Jane Street is both an investor and a customer, a rare combination for the trading firm.