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

Who backs Antithesis?

23 investors
InvestorType
US National Science FoundationOther
Spark CapitalVenture capital
Amplify PartnersVenture capital
Teamworthy GroupVenture capital
Sovereign's CapitalPE / buyout
Patrick CollisonAngel
Olima VenturesVenture capital
First In—
Jane StreetOther
Tamarack GlobalVenture capital
+ 13 more investors · a free account shows the complete list
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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.

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