Fundraising Fox
/Companies
Sign in

Antigen

YC F25

San Francisco, US · Founded 2026 · 5 employees · Hiring · 18 known investors

Find your way into Antigen

Sign up to see every warm intro you have to Antigen

  • Paths you didn't know you had: your email and LinkedIn already hold routes to the Antigen team. We find them for you
  • 2nd- and 3rd-degree connections: the friend-of-a-friend routes that take hours to manually find through your inbox or LinkedIn
  • Answers now, not in days: momentum is everything in a raise. Skip asking around whether someone knows someone

Days of research, done the moment you sign in, with every route ranked by how warm it is.

Sign up with GoogleAlready have an account? Log in

Antigen provides continuous offensive security testing for enterprise production environments using AI agents nightly and human red teams monthly, with findings integrated into engineering tools.

Also known as Claybird Inc. · Claybird · Claybird, zag.dev, Zag · Zag · zag.dev

AI & Machine LearningCybersecurityDeveloper ToolsEnterprise SoftwareArtificial IntelligenceUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (F25)

Antigen was founded in 2026 by Saad Jamal and Abdullah Nauman.

SJSaad Jamal
Saad JamalCo-Founder // CEOHe previously worked on machine learning infrastructure at Tesla Autopilot, developed an ML compiler framework at Nuro, and trained reasoning models with Ashish Vaswani. He also clerked at the Supreme Court of Pakistan and attended UChicago Law School.
ANAbdullah Nauman
Abdullah NaumanCo-FounderHe previously worked as a product manager at Google Ads and as an ML engineer at Google Search, where he built large-scale infrastructure for conversion measurement. Earlier in his career, he joined a YC-backed startup as an early employee, scaled a bootstrapped SaaS business, and developed low-level imaging software for semiconductor manufacturing.

Investors · 18

East Sunshine Ventureslisted by East Sunshine VenturesSilicon Valley

How we know: East Sunshine Ventures's portfolio page · Y Combinator's founder network · Not right? Tell us

Transpose Platform Managementlisted by Transpose Platform ManagementSan Francisco

How we know: Transpose Platform Management's portfolio page · Y Combinator's founder network · Not right? Tell us

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · open dataset · 5k.vc investor directory · Not right? Tell us

8VCreportedAustin · $500K – $50M

How we know: cen.acs.org · Not right? Tell us

Alumni VenturesreportedManchester · $100K – $10M

How we know: Y Combinator's founder network · Not right? Tell us

Andreessen HorowitzreportedMenlo Park · $500K – $50M

How we know: cen.acs.org · Not right? Tell us

Blast.Clubreported$5.5M

How we know: Y Combinator's founder network · Not right? Tell us

Cur8 CapitalreportedLondon

How we know: Y Combinator's founder network · Not right? Tell us

Founder CapitalreportedSilicon Valley · $25K – $100K

How we know: Y Combinator's founder network · Not right? Tell us

General PartnershipreportedSan Francisco · $1M – $30M

How we know: Y Combinator's founder network · Not right? Tell us

Hike VenturesreportedSan Francisco · $1M – $5M

How we know: Y Combinator's founder network · open dataset · 5k.vc investor directory · Not right? Tell us

Lightspeed Venture PartnersreportedMenlo Park · $1M – $5M

How we know: Y Combinator's founder network · Not right? Tell us

Madrona Venture GroupreportedSeattle · $2M – $10M

How we know: Y Combinator's founder network · Not right? Tell us

Nama Venturesreported$250K – $1M

How we know: Y Combinator's founder network · Not right? Tell us

OurCrowdreportedJerusalem

How we know: Y Combinator's founder network · Not right? Tell us

POWERSETreportedClaymont

How we know: Y Combinator's founder network · Not right? Tell us

Also in the syndicate · 1

Wing VC

Funding

SEC filings, press & company announcements

Source: company announcements and press reports — follow each round's link for the claim.

Images

Antigen photoAntigen photo

Related companies · 5

GumloopGumloop is a platform for building and deploying AI agents that automate business tasks such as data analysis, customer support, CRM management, and meeting preparation. The platform serves enterprise teams and includes multi-agent workflow orchestration, integrations with workplace tools like Slack and Teams, and security controls for managing AI model access and data governance.
OmnaraOmnara provides an open-source platform for deploying, running, and managing AI agents through a unified API, available both as a self-hosted solution and managed cloud service.
RaindropRaindrop provides observability and monitoring for AI agents, capturing traces of production runs including messages, tool calls, retries, and errors. The platform helps engineering teams detect silent failures, auto-fix issues, and integrate monitoring directly into Slack workflows.
CobberyCobbery develops AI agents for litigation teams that analyze case facts, develop trial strategy, flag legal issues, and conduct research to accelerate case preparation and reduce expert costs.
TypewiseTypewise develops generative AI agents that automate customer service workflows, including data retrieval from legacy systems and ticket resolution. The platform is designed for support teams to handle customer inquiries more efficiently while freeing up human agents for complex interactions.

Companies working in the same space as Antigen.

Legal entities · 1

corporate structure
Claybird Inc.

In the news

Zag: AI Review Agents for Every PRycombinator.com · Oct 2025

Frequently asked questions

What does Antigen do?
Antigen provides continuous offensive security testing for enterprise production environments using AI agents nightly and human red teams monthly, with findings integrated into engineering tools.
Who founded Antigen?
Antigen was founded by Saad Jamal, Abdullah Nauman in 2026.
Who are Antigen's investors?
Antigen's investors include Angel Operator Partners (aop), East Sunshine Ventures, Transpose Platform Management, Y Combinator, 8VC, Alumni Ventures, Andreessen Horowitz, Blast.Club and 9 more.
Where is Antigen headquartered?
Antigen is headquartered in San Francisco, US.