Security Startups

Tenzai

Autonomous AI pentesting for enterprises: agents that discover, chain and exploit application vulnerabilities continuously, then guide and retest the fixes.

Proof of life. Emerged from stealth with a $75M seed round led by Greylock, Battery Ventures and Lux Capital, November 2025

About Tenzai

Tenzai, based in Tel Aviv, replaces infrequent manual penetration tests with AI agents that attack an organization's applications on a continuous basis.

The agents look for business-logic flaws and chain individual weaknesses into working exploits, so each finding arrives with proof that it can be abused.

Results include a WAF mitigation for immediate cover and a guided permanent fix that the system retests, and users can inspect the agent's reasoning at every step.

The founding team includes Pavel Gurvich and Ariel Zeitlin, who previously co-founded Guardicore (acquired by Akamai), and Aner Mazur, a former Snyk product chief. The company says it is piloting with large firms in financial services, healthcare and technology.

Investors

Greylock PartnersBattery VenturesLux CapitalSwish Ventures
Work at Tenzai? Link to this listing

Optional badge for your site or README. It changes nothing about the listing, its order or its review. Other formats and a dark version: press kit.

<a href="https://securitystartups.com/companies/tenzai"><img src="https://securitystartups.com/badge/listed.svg" alt="Listed on Security Startups" width="184" height="44"></a>