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 153AI infra and compute 152Climate and energy 123Defense and space 85Other 44
| Company | Cluster | Program | Status | Last signal |
|---|---|---|---|---|
| Icarus Stratospheric birds for defense | Defense and spaceautonomous stratospheric surveillance aircraft | Y CombinatorF25 | Active | checked 2026-08-23 |
| LakoniaAI Delivering AI-powered situational awareness in tactical environments. | Defense and spaceAI command and control for tactical ops | Y CombinatorF25 | Active | checked 2026-08-23 |
| Null Labs End-to-end Simulation for Defense Autonomy | Defense and spaceautonomous systems simulation | Y CombinatorF25 | Active | checked 2026-08-23 |
| Wardstone The Modular Interceptor Platform | Defense and spaceLow-cost modular air defense interceptors | Y CombinatorF25 | Active, new domain | 2026-08-23 |
| Zephyr Fusion Powering tomorrow's industrial revolution in space | Defense and spacein-orbit fusion power for space industry | Y CombinatorF25 | Active | checked 2026-08-23 |
| Albacore Inc. Drone submarines | Defense and spaceautonomous underwater drone systems | Y CombinatorS25 | Active | checked 2026-08-23 |
| Perseus Defense America's Golden Dome for Drones | Defense and spacecounter-UAS defense systems | Y CombinatorS25 | Active | checked 2026-08-23 |
| Cascade Space Commercial alternative to the Deep Space Network | Defense and spaceCommercial deep space ground stations | Y CombinatorX25 | Active | checked 2026-08-23 |
| Enhanced RadarAI AI for air traffic control | Defense and spaceAI air traffic control systems | Y CombinatorW25 | Active | checked 2026-08-23 |
| Instinct Space Building lunar landers | Defense and spacelunar lander hardware | Y CombinatorW25 | Active | checked 2026-08-23 |
| Orbital Operations High Thrust Space Vehicles for Satellite Defense | Defense and spacesatellite defense vehicles | Y CombinatorW25 | Active | checked 2026-08-23 |
| Reditus Space Reusable Satellites | Defense and spaceReusable orbital platforms | Y CombinatorW25 | Active | checked 2026-08-23 |
| Splash Inc. Autonomous patrol-boats for National Security | Defense and spaceautonomous patrol vessels for national security | Y CombinatorW25 | Active | checked 2026-08-23 |