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14,448 startups · 29 programs

Antigen

Active · Continuous offensive security for the enterprise.

WebsiteYC profile

Why it ranks

How the rank works
10signal of 100 · rising 9
  • team of 5Team size · YC's directory+4
  • went through YCProgram · this site+4
  • hiringHiring · Titles (titles.fru.dev), YC+2

A sum of public facts, not a judgement and not investment advice.

Competitors

AITridentShared: offensive security, cybersecurity, attackYC S26San FranciscoStartup →AIEscapeShared: offensive security, directlyYC W23ParisStartup →AIMindFortShared: offensive security, cybersecurity, exploitYC X25Los AngelesStartup →OtherUpguardShared: attack surface, cybersecurity, assessment500 Global 2012United StatesStartup →AIRAPIDFORTShared: attack surface, continuous, securityPlug and PlayUnited StatesStartup →
Companies closest to Antigen
Company
TridentShared: offensive security, cybersecurity, attackYC S26ActiveAI
EscapeShared: offensive security, directlyYC W23ActiveAI, Devtools
MindFortShared: offensive security, cybersecurity, exploitYC X25ActiveAI, Devtools
UpguardShared: attack surface, cybersecurity, assessment500 Global 2012Not statedOther
RAPIDFORTShared: attack surface, continuous, securityPlug and Play Not statedAI

Adjacent

OtherLupin & HolmesShared: offensive securitySeedcamp 2026Startup →AICodeAnt AIShared: cybersecurity, offensive, continuousYC W24San FranciscoStartup →AIOblixShared: cybersecurity, offensive, testing500 Global 2025United StatesStartup →AIKairoShared: attack surface, cybersecurity, continuousspeedrun SR007San FranciscoStartup →OtherKrixoShared: attack surface, remediationGoogle AI for Cybersecurity 2025ColombiaStartup →
Companies next to Antigen
Company
Lupin & HolmesShared: offensive securitySeedcamp 2026Not statedOther
CodeAnt AIShared: cybersecurity, offensive, continuousYC W24 +1ActiveAI, Devtools
OblixShared: cybersecurity, offensive, testing500 Global 2025Not statedAI
KairoShared: attack surface, cybersecurity, continuousspeedrun SR007Not statedAI, Data, Devtools
KrixoShared: attack surface, remediationGoogle AI for Cybersecurity 2025Not statedOther

Also from F25 in AI

All of F25
AIComplyDoGlobal Compliance for EnterprisesYC F25BerlinStartup →AILogosGuardThe sensitive data redaction layer for AIYC F25San FranciscoStartup →AIVeria LabsContinuous AI pentesting that finds and fixes vulnerabilitiesYC F25San FranciscoStartup →AIAbsurdThe production canvas for AI film teamsYC F25Los AngelesStartup →AIAirCaps AIVoice AI that hears what other models miss.YC F25San FranciscoStartup →AIAlderAI employees for finance, starting with accounts receivable.YC F25San FranciscoStartup →
Company
ComplyDoGlobal Compliance for Enterprisesteam of 17hiringActiveAI
LogosGuardThe sensitive data redaction layer for AIteam of 2ActiveAI
Veria LabsContinuous AI pentesting that finds and fixes vulnerabilitiesteam of 3ActiveAI
AbsurdThe production canvas for AI film teamsteam of 10ActiveAI
AirCaps AIVoice AI that hears what other models miss.team of 5hiringActiveAI, Devtools
AlderAI employees for finance, starting with accounts receivable.team of 2hiringActiveAI

Founders

  • Saad JamalFounder/CTO
  • Abdullah NaumanFounder

About Antigen

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.

YC batch
F25 · Fall 2025
Status, per YC
Active
Category
AI, Developer tools
Team size
5
Location
San Francisco, CA, USA
Founded
2026
Checked
6h ago

YC tags: Cybersecurity, AI

Changes seen

TagsOct 19, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗

Antigen in F25: 146 companies, 88% AI

LinkedIn

Antigen: questions

Which YC batch was Antigen in?

Antigen was in Y Combinator's Fall 2025 batch (F25).

Is Antigen still active?

Y Combinator lists Antigen as active.

Who founded Antigen?

Antigen's founders, as listed on its YC page: Saad Jamal (Founder/CTO), Abdullah Nauman (Founder).

Where is Antigen based?

Antigen lists San Francisco, CA, USA as its location on YC's directory.