Premier Alternatives

Antithesis

Business/Productivity Software · Vienna, VA · Founded 2018 · Privately Held (backing)

Developer of quality assurance software intended to facilitate autonomous software testing. Antithesis is based in Vienna, VA and was founded in 2018. Its last reported valuation was $215 million in Feb 2024. It has raised $160 million across 2 recorded rounds; the latest was a $105 million Series A in Dec 2025.

Last reported valuation
$215.0M
Oct 2026
Priced at
—
Total raised
$160.0M
Last round
Later Stage VC (Series A)
Dec 2025

Antithesis key facts

as of Oct 2026
  • Developer of quality assurance software intended to facilitate autonomous software testing.
  • Antithesis is valued at approximately $215.0M as of Oct 2026 (last reported valuation).
  • 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).
Last reported valuation
LOW confidence
$215.0M

Antithesis's last reported valuation, Feb 2024. Nothing priced has surfaced since.

set by last reported valuationas of Oct 2026question about this number?
Free account
More of Antithesis with a free account
  • ·The complete investor list: 23 names
  • ·Watch Antithesis: the Monday email on marks, rounds and moves
Create free account
No card required

Membership and data by Private Market View

Antithesis funding rounds

2 rounds
Dec 2025Later Stage VC (Series A)$105.0M▮
Feb 2024Seed Round$47.0M▮
Full funding history →

Vehicles formed to buy Antithesis shares

secondary demand · SEC Form D filings

In the last 12 months, 1 investment vehicle were formed to buy Antithesis shares, reporting $106K sold to 2 investors. Most recent filing Mar 2026.

The vehicle list — each sponsor, filing date, amount sold and investor count — is a Pro table. Unlock the 1 vehicle →

Membership and data by Private Market View

Companies with the most vehicle activity →

Antithesis valuation

Antithesis's last reported valuation was $215 million in Feb 2024. No priced round, secondary trade or fund mark has surfaced since.

How much has Antithesis raised?

Antithesis has raised $160 million across 2 recorded rounds since 2024. The largest was a $47 million seed round in Feb 2024; the most recent was a $105 million Series A in Dec 2025.

Institutional holders and vehicles

In the last 12 months, 1 investment vehicle was formed to buy Antithesis shares, reporting $106,331 sold to 2 investors, per SEC Form D filings (most recent Mar 2026).

Antithesis investors

23 investors are on record for Antithesis, including US National Science Foundation, Spark Capital, Amplify Partners and Teamworthy Group. By type, the record holds 5 venture capital firms and 1 private equity firm. The Series A in Dec 2025 drew 10 investors.

Comparable companies

Comparable business/productivity software names by valuation on PrivateMarketView: NetBox Labs ($215 million), Regrow ($210 million) and Ema Unlimited ($207 million).

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
Ownership
Privately Held (backing)

Is this your company? Sign in with your work email to keep it current, or tell us what's wrong.