Y Combinator companies
The Y Combinator portfolio as the radar sees it: synced daily, classified into clusters, checked for life and movement. 6,197 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 151Climate and energy 123Defense and space 85Other 44
| Company | Cluster | Program | Status | Last signal |
|---|---|---|---|---|
| ApolloShield ApolloShield is a system that detects unwanted drones and drives them… | Defense and spacedrone detection and interdiction | Y CombinatorS16 | Active | checked 2026-08-23 |
| Prime Lightworks Prime Lightworks Inc. manufactures electric propulsion systems for… | Defense and spaceelectric propulsion for satellites | Y CombinatorS16 | Site unreachable | checked 2026-08-17 |
| Astranis Advanced satellites for high orbits. | Defense and spaceadvanced satellite communications | Y CombinatorW16 | Active | checked 2026-08-23 |
| Boom Economically and environmentally sustainable supersonic travel | Defense and spacesupersonic aircraft manufacturing | Y CombinatorW16 | Active | checked 2026-08-23 |
| Relativity Space Building humanity’s multiplanetary future. | Defense and space3D printed rockets and reusable launch vehicles | Y CombinatorW16 | Active | checked 2026-08-23 |