United States · 
Who invested in Antithesis?
Antithesis's investors include Spark Capital, Jane Street, Amplify Partners, Patrick Collison and Tamarack Global, and 6 more on record. Jane Street led its latest round.
2026
$30MVenture$105MSeries A
United States · Series A startup
Who invested in Antithesis
2 rounds we have observed, with the 11 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
Raised 11 months ago
Follow Antithesis and see its new rounds in your feed. Start following
Funding summaryUpdated 5 Nov 2026
$135Mraised across 2 rounds since 2025, from 2 sources
$30MVenture$105MSeries A
- Latest round
- Series A, $105MDec 2025
- Led by
- Jane Street
- Step-upi
- 3.5×
- Investors
- 11 (1 led)
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Venture, $30M Feb 2025
- Biggest round
- $105M Series A · Dec 2025
- Between rounds
- 10 months from the last two
The rounds
- Dec 2025Series A$105M9 new1 returning
- Jane StreetLead
Spark Capital- Patrick Collison
Tamarack Global
Teamworthy Ventures
First In Ventures- Sholto Douglas
- Amplify Venture Partners
- Dwarkesh Patel
Hyperion Capital
Reported by Ventureburn
- Feb 2025
Founders and team
From Antithesis's own website: 2 founders, 12 on the team.
- Akshay ShahField CTO, North America
- Ben CollinsChief Technology Officer
- Max JacobsonField CTO, EMEA
- Nick LavezzoChief Operations Officer
- Randall JacksonChief Revenue Officer
- Hao GuanVP of Sales
- Jeremy KingVP of Product
- McKenna DulleaController & VP of Finance
- Armaan MehtaEngineer
- Mia ShakerSenior Software Engineer
- Winter M.Senior Software Engineer
- Yusuf Van GiesonSenior Software Engineer
Who was in which round
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
Everyone who backed them
Jane StreetGrowth equity1round, led 1
Patrick CollisonAngel1round
Sholto DouglasVC firm1round
Amplify Venture PartnersVC firm1round
Dwarkesh PatelVC firm1round
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 7 firms list Antithesis as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Quick answers about Antithesis
How much has Antithesis raised?
Antithesis has raised $135M across 2 rounds since 2025.
When did Antithesis last raise?
Antithesis's most recent round was a Series A of $105M in Dec 2025, led by Jane Street.
What was Antithesis's biggest round?
Its most recent round, $105M in Dec 2025, is also its largest on record.
Who backed Antithesis first?
Antithesis's first round on record, in Feb 2025, was backed by Spark Capital and Amplify Partners.
What stage is Antithesis at?
Antithesis's latest named round is a Series A, in Dec 2025.
Where is Antithesis based?
Antithesis is based in the United States.
Who led Antithesis's rounds?
Jane Street led the Series A in 2025.
Companies like Antithesis
In the same sector, and raised in the last eighteen months.
Find investors like these
Search every investor by what they have actually funded, then narrow to your stage and market. Free.