Y Combinator companies
The Y Combinator portfolio as the radar sees it: synced daily, classified into clusters, checked for life and movement. 6,198 companies.
clusterVertical AI agents 898Consumer 821B2B SaaS 787Fintech 633Developer tools 515Healthcare and bio 477Commerce and marketplaces 433Agent infrastructure 350Robotics and physical world 314Data for AI 192Security and compliance 189Horizontal AI assistants 152AI infra and compute 152Climate and energy 123Defense and space 85Other 44
| Company | Cluster | Program | Status | Last signal |
|---|---|---|---|---|
| Metapacket Metapacket is the first selective web gateway that stops malware by… | Security and compliancemalware detection and prevention gateway | Y CombinatorS16 | Inactive | checked 2026-08-24 |
| AmberBox Gunshot Detection Detect Gunshots | Inform Law Enforcement | Empower First Responders | Security and compliancegunshot detection and law enforcement alerts | Y CombinatorW16 | Active | checked 2026-08-23 |
| Castle Block bots & bad behavior | Security and complianceBot and fraud detection platform | Y CombinatorW16 | Active | checked 2026-08-23 |
| Patchwork Security Security patch notifications for servers. Build it, deploy it, and… | Security and compliancesecurity patch management automation | Y CombinatorW16 | Inactive | checked 2026-08-24 |
| Salt Security Protects organizations from getting breached through their APIs. | Security and complianceAPI security and threat detection | Y CombinatorW16 | Active | checked 2026-08-23 |
| Stealth Worker Information Security (Cyber Security), Compliance and Privacy (GDPR &… | Security and complianceSecurity and compliance contractor marketplace | Y CombinatorW16 | Active | checked 2026-08-23 |