Antigen YC Application
Antigen went through Y Combinator in the Fall 2025 batch as a B2B company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.
- YC batch
- Fall 2025
- Industry
- B2BEngineering, Product and Design
- Team size
- 3
- Status
- Active
- Launched
- 2025
Founders
Saad JamalFounder
Abdullah NaumanFounder
What Antigen does
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.
Antigen's YC application, reconstructed
Y Combinator application
Antigen, Fall 2025 batch. The real form questions, answered from public data.
- Founders2
- Company7
- Progress7
- Idea4
- Equity3
- Curious2
- Batch Preference1
Company
Antigen
Continuous offensive security for the enterprise
We built an AI adversary that performs automated nightly offensive security tests and monthly human red team assessments for enterprises. The product maps attack surfaces, exploits vulnerabilities, and delivers detailed findings with reproduction steps and remediation directly into GitHub, Linear, or our platform. This helps security teams continuously verify and improve their defenses against real-world attacks.
We live in San Francisco, CA, and will continue to base the company here after YC.
San Francisco has the engineering and security talent we need. We are already embedded in the local ecosystem, which is crucial for recruiting and enterprise sales.
21 more answers in the full application
Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.
Frequently Asked Questions
Is this the real Antigen YC application?
No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Antigen's public data (launch notes, founder backgrounds, product description). It shows how a company like Antigen would present itself to YC, not the text they submitted.
What YC batch was Antigen in?
Antigen was part of the Y Combinator Fall 2025 batch.
Who founded Antigen?
Antigen was founded by Saad Jamal, Abdullah Nauman.
What does Antigen do?
Continuous offensive security for the enterprise.
How do I read the full reconstructed application?
Create a free Round Funded account. The full 26-answer version of Antigen's application, and every other YC batch, is in YC Insights.
