Security

Antigen

Website
Founded 2026Origin source ↗Checked 2026-09-15

Overview

Antigen is an AI adversary for the enterprise. It maps, exploits, and secures your attack surface through nightly automated offensive testing and monthly human red team assessments. Every finding is delivered with traces, reproduction steps, and remediation directly in GitHub, Linear, or the Antigen Platform.

We work with companies in financial services, healthcare, retail, and government where security is trust.

We're backed by Lightspeed, DST Global, and Susa Ventures.

Company description As recorded 2026-11-08
LinkedIn
SecurityAI agentBusinessesEnterpriseSubscription

Founders & team

Previously Claybird, zag.dev, Zag

Company history As recorded 2026-11-08

Saad Jamal

Founder/CTO

co-founder @ antigen. prev. ml infra at tesla autopilot. law school dropout. Before Zag, Saad trained reasoning models with Ashish Vaswani, author of the famous Attention Is All You Need paper. At Nuro, he developed an ML Compiler framework that enabled running the perception layer across multiple GPU's. And at Tesla he built infrastructure that halved the time it took to train Planning & Controls models. He also served at the Supreme Court of Pakistan and dropped out of UChicago Law.

LinkedIn X
Founder profile As recorded 2026-09-15

Abdullah Nauman

Founder

Co-Founder @ Antigen. Previously product at Google Ads and ML at Google Search. Previously at Google, shipped product features for new advertisers and built large-scale ML infrastructure for measuring cross-site conversions on Search. Took a year off college to join as second employee at a YC startup. Separately scaled a bootstrap SaaS to $30k MRR. Also wrote low-level imaging software for silicon wafer manufacturing.

LinkedIn X
Founder profile As recorded 2026-09-15
5team members reported
Source-reported As recorded 2026-09-15

Founded 2026 · Source

News & product activity

Sources & observations

Y Combinator

Profile depthenriched profile
Website observationwebsite reachable
Last website check2026-11-11
Location · source statedSan Francisco, CA, USA
Pricing evidenceA pricing page was detected
Maturity: Operating · 4 of 6 areas documented

Source-based assessment · automated evidence rules

The company website explicitly reports customer or user adoption. This is a source-based assessment of a company claim; scale and revenue are not independently verified.

Company website: home Checked 2026-10-17

Trusted by teams at

Maturity is an evidence-based assessment, not a success rating. It may understate the current stage where evidence is limited. Coverage records documented areas, not a complete or independently audited company history.

Stage definitions
independent websitesource corroborationreachable websitedescriptive evidenceclassified market and modelsourced peoplesourced founding yearpricing page observeddocumentation observed
startup.observe Directory coverage · Sources & method