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 |
|---|---|---|---|---|
| Bun Bun is an incredibly fast all-in-one JavaScript toolkit | Developer toolsJavaScript runtime and toolkit | Y CombinatorS19 | Acquired | checked 2026-08-23 |
| Data Mechanics Spark-on-Kubernetes Data Engineering Platform | Developer toolsSpark-on-Kubernetes data engineering platform | Y CombinatorS19 | Acquired | checked 2026-08-24 |
| FeaturePeek Supercharged deployment previews for all. | Developer toolsdeployment preview and feedback tooling | Y CombinatorS19 | Acquired | checked 2026-08-23 |
| Fuzzbuzz Fuzzing as a Service | Developer toolsFuzzing and security testing platform | Y CombinatorW19 | Acquired | - |
| Memfault First IoT reliability platform for debugging, monitoring, OTA updates | Developer toolsIoT device debugging and OTA updates | Y CombinatorW19 | Acquired | checked 2026-08-23 |
| Preflight No-code Web Apps testing for everyone | Developer toolsNo-code web testing platform | Y CombinatorW19 | Acquired | checked 2026-08-24 |
| Visly Build React components visually | Developer toolsVisual component builder for React | Y CombinatorW19 | Acquired | 2026-08-23 |