Security Startups

Casco

Casco builds AI agents that run continuous penetration tests against live applications, APIs, cloud setups and AI systems, with optional human supervision, for engineering and security teams.

Proof of life. Announced a Series A led by Standard Capital at a $100M valuation, July 2026

About Casco

Casco sells autonomous security testing that it describes as an agentic security engineer. Its agents test web apps, APIs, cloud configuration and AI systems while they run, reproduce attack paths and attach evidence and remediation guidance to each finding.

Teams can run continuous pentests or human-supervised engagements, triage incoming external vulnerability reports against their own environment, and request retests. The company also produces pentest reports that customers use in SOC 2, ISO 27001 and HIPAA reviews.

Casco is a Y Combinator company and says more than 400 companies use it.

Investors

FundersClubRebel FundStandard CapitalY Combinator
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