Antithesis
Antithesis is a developer tools company in Tysons, United States, founded in 2018. It has raised $152.0M across 2 rounds, most recently a $105.0M Series A in December 2025.
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- Headquarters
- Tysons, Virginia
- Employees
- 51–200
- Founded
- 2018
- Business Model
- SaaS
- Website
- antithesis.com
- Total Funding
- $152.0M
- Last Round
- $105.0M Series ADec 2025
- Rounds
- 2
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 2 funding rounds and 6 investors for this company. The full record is or through the API.
About
Antithesis is a software reliability platform that uses deterministic simulation to explore the full state space of complex distributed systems, finding bugs missed by traditional testing. It helps fintech, blockchain, databases, and cloud infrastructure teams release safer and faster.
Summary
It lists 51–200 employees. It has raised $152.0M in total across 2 rounds, most recently a $105.0M Series A round in Dec 2025. Investors include Amplify Partners, Jane Street and Spark Capital.
Tech & App Stack
10 technologies & apps tracked
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Funding History
Dec 2025
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Funding: Seed through Series A. Amounts, valuations, and investors where available.
Investors
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