| 1000029367 | CEDRION | ES-Spain | Company | No | Alumnus | ESA BIC Madrid Region | |
| 1000040241 | Cellgrid | DE-Germany | Company | No | Alumnus | ESA BIC North Rhine-Westphalia | |
| 1000042438 | CELUS GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000034045 | Centrale Valutativa | IT-Italy | Company | No | Alumnus | ESA BIC Lazio | |
| 1000039469 | Cevotec GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000042336 | Circe. Smart Navigation Solutions | ES-Spain | Company | No | Alumnus | ESA BIC Barcelona | |
| 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 | |
| 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 | |
| 1000027465 | ColomboSky s.r.l. | IT-Italy | Company | No | Alumnus | ESA BIC Lazio | |
| 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 | |
| 1000045176 | Coolx Earth S.L | ES-Spain | Company | No | Alumnus | ESA BIC Madrid Region | |
| 1000046933 | Core Orbital Systems SAS | FR-France | Company | No | Alumnus | ESA BIC Nord France | |
| 1000039489 | Correntics GmbH | CH-Switzerland | Company | No | Alumnus | ESA BIC Switzerland | |
| 1000049192 | Croowy GmbH | DE-Germany | Company | No | Incubatee | ESA BIC Hessen | |
| 1000028834 | CropOM | AT-Austria | Company | No | Alumnus | ESA BIC Austria | |