Key facts
- Antithesis’s last known valuation is $215.0M (Feb 2024).
- It has raised $160.0M across 2 recorded rounds; the latest was Later Stage VC (Series A) ($105.0M) in Dec 2025.
- Notable investors include US National Science Foundation, Spark Capital, Amplify Partners, Teamworthy Group, Sovereign's Capital — 23 tracked in total.
- 1 investment vehicle was formed to buy Antithesis shares in the last 12 months, reporting $106K sold to 2 investors, per SEC Form D filings.
- Status: Privately Held (backing).
- ·Post-money valuations for all 2 rounds
- ·The complete investor list — 23 names
- ·Watchlist + deal alerts for Antithesis
Funding rounds
2 roundsSecondary demand: investment vehicles
from SEC Form D filingsIn the last 12 months, 1 investment vehicle were formed to buy Antithesis shares, reporting $106K sold to 2 investors. Most recent filing Mar 2026. Vehicles like these are how secondary buyers pool demand for a name; a rising count is a demand signal.
About Antithesis
Developer of quality assurance software intended to facilitate autonomous software testing. The company's software searches for software bugs in a controlled environment where all bugs are reproducible and offer fault tolerance bugs, enabling clients to detect failures of their software that occur under specific network, hardware, or timing conditions.
- Industry
- Business/Productivity Software
- Sector
- Information Technology
- HQ
- Vienna, VA, United States
- Founded
- 2018
- Employees
- 91
- Website
- antithesis.com/
- Ownership
- Privately Held (backing)
Antithesis doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in Antithesis shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on Antithesis in its N-PORT filings yet. We sweep new filings monthly.