| 1000032787 | CHEXS | DK-Denmark | Company | Yes | Alumnus | ESA BIC Denmark | |
| 1000042336 | Circe. Smart Navigation Solutions | ES-Spain | Company | No | Alumnus | ESA BIC Barcelona | |
| 1000034163 | Circuits Integrated Hellas S.A. | GR-Greece | Company | Yes | Alumnus | ESA BIC Greece | |
| 1000048249 | Clarity AI | DE-Germany | Company | Yes | Alumnus | ESA BIC Hessen | |
| 1000039016 | ClearSky Imagery ApS | DK-Denmark | Company | Yes | Alumnus | ESA BIC Denmark | |
| 1000030383 | ClearSpace SA | CH-Switzerland | Company | Yes | Alumnus | ESA BIC Switzerland | |
| 1000035121 | CLOUD SIGNALS | GR-Greece | Company | Yes | Alumnus | ESA BIC Greece | |
| 1000015579 | CLOUDEO AG | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000042381 | CM 1 GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000036987 | Coactum SA | CH-Switzerland | Company | No | Alumnus | ESA BIC Switzerland | |
| 1000041379 | COBOT Dynamics gmbh | AT-Austria | Company | Yes | Alumnus | ESA BIC Austria | |
| 1000039360 | Cognitive Design Systems | FR-France | Company | No | Alumnus | ESA BIC Sud France | |
| 1000048600 | CognitX AI UG | DE-Germany | Company | No | Alumnus | ESA BIC Hessen | |
| 1000041863 | Coher Sense UG | DE-Germany | Company | No | Alumnus | ESA BIC Northern Germany | |
| 1000046770 | ColdXray Oy | FI-Finland | Company | Yes | Alumnus | ESA BIC Finland | |
| 1000027465 | ColomboSky s.r.l. | IT-Italy | Company | No | Alumnus | ESA BIC Lazio | |
| 1000038069 | CompPair Technologies Ltd | CH-Switzerland | Company | Yes | Alumnus | ESA BIC Switzerland | |
| 1000039220 | condenZero | CH-Switzerland | Company | No | Alumnus | ESA BIC Switzerland | |
| 1000034538 | Connect Robotics (CRSA - Connect Robotics Sistemas Autónomos, Lda.) | PT-Portugal | Company | No | Alumnus | ESA BIC Portugal | |
| 1000035883 | ConstellR GmbH | DE-Germany | Company | Yes | Alumnus | ESA BIC Baden-Württemberg | |