Antithesis Raises $105M Series A

Antithesis, based in Tysons Corner, Virginia, is a software-testing startup that has raised $105 million in Series A funding. The company provides a deterministic simulation testing platform designed to help engineers identify and resolve software bugs more efficiently. This latest round brings the company's total funding to over $180 million.

Investors

This funding round was led by Jane Street, a quantitative trading firm that is also a major customer of the company.

Antithesis Use of Funds

Antithesis plans to use the new capital to expand its engineering team, enhance the platform's autonomy features, and scale its sales and marketing operations across North America, Europe, and Asia.

About Antithesis

Founded in 2018 by Will Wilson, who previously co-founded FoundationDB, Antithesis provides a flight simulator for code. The platform creates a controlled replica of a production environment using a deterministic hypervisor, allowing engineers to replay runs, inject realistic faults, and perform automatic root-cause analysis.

Funding Details

Company Website: https://antithesis.com

Company: Antithesis
Raised: $105M
Round: Series A
Funding Date: December 3, 2025
Lead Investor: Jane Street
Software Category: Software Testing
Source: https://cryptobriefing.com/antithesis-raises-105m-525m-valuation/