Cohorts of 2021
Companies whose accelerator cohort started in 2021. 1,685 companies.
clusterB2B SaaS 183Consumer 168Fintech 155Healthcare and bio 126Commerce and marketplaces 111Developer tools 68Climate and energy 66Vertical AI agents 66Robotics and physical world 59Security and compliance 34Other 28Data for AI 24Horizontal AI assistants 17Defense and space 15Agent infrastructure 13AI infra and compute 7
| Company | Cluster | Program | Status | Last signal |
|---|---|---|---|---|
| HEO Robotics We visually monitor space objects for governments and defense | Defense and spaceSatellite imagery and space monitoring | Y CombinatorS21 | Active | 2026-08-23 |
| Inversion Space Turning space into a transportation layer for Earth | Defense and spacespace infrastructure for transportation | Y CombinatorS21 | Active | checked 2026-08-23 |
| Kalam Labs Near Space Flying Machines | Defense and spacehigh-altitude UAVs for reconnaissance | Y CombinatorS21 | Active | checked 2026-08-23 |
| Odys Aviation Vertical takeoff and landing aircraft for major airlines | Defense and spaceeVTOL aircraft manufacturing | Y CombinatorS21 | Active | checked 2026-08-23 |
| Onebrief Onebrief makes military headquarters run seamlessly | Defense and spacemilitary planning software | Y CombinatorS21 | Active | checked 2026-08-23 |
| TransAstra Corporation Orbital logistics: Unleashing space industry, from Earth to asteroids | Defense and spaceorbital logistics and propulsion | Y CombinatorS21 | Active | checked 2026-08-23 |
| Turion Space Moving Things Around in Space, Imaging Space Objects When We're Not | Defense and spacespace domain awareness and orbital services | Y CombinatorS21 | Active | checked 2026-08-23 |
| Alba Orbital We make satellites to image everywhere on Earth, every 15 minutes | Defense and spaceEarth observation satellite constellation | Y CombinatorW21 | Active | checked 2026-08-23 |
| Albedo Full-stack VLEO satellite missions | Defense and spaceVLEO satellite infrastructure and operations | Y CombinatorW21 | Active | checked 2026-08-23 |
| Care Weather The highest-accuracy global weather data from low-cost flat satellites | Defense and spaceEarth observation satellites | Y CombinatorW21 | Active | checked 2026-08-23 |
| Stoke Space Seamless mobility to, through, and from space. It starts with 100%… | Defense and spacereusable rocket launch vehicle | Y CombinatorW21 | Active | checked 2026-08-23 |