| 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 | |
| 1000045176 | Coolx Earth S.L | ES-Spain | Company | No | Alumnus | ESA BIC Madrid Region | |
| 1000038987 | CORAC Engineering s.r.o. | CZ-Czech Republic | Company | Yes | Alumnus | ESA BIC Czech Republic | |
| 1000035240 | CORAmaps GmbH | DE-Germany | Company | Yes | Alumnus | ESA BIC Hessen | |
| 1000046933 | Core Orbital Systems SAS | FR-France | Company | No | Alumnus | ESA BIC Nord France | |
| 1000039329 | Corintis SA | CH-Switzerland | Company | Yes | Alumnus | ESA BIC Switzerland | |
| 1000039489 | Correntics GmbH | CH-Switzerland | Company | No | Alumnus | ESA BIC Switzerland | |
| 1000037164 | Cosmic S.r.l. | IT-Italy | Company | Yes | Alumnus | ESA BIC Lazio | |
| 1000046153 | cosy.green GmbH | DE-Germany | Company | Yes | Alumnus | ESA BIC Hessen | |
| 1000049192 | Croowy GmbH | DE-Germany | Company | No | Incubatee | ESA BIC Hessen | |
| 1000028834 | CropOM | AT-Austria | Company | No | Alumnus | ESA BIC Austria | |
| 1000040580 | CropOM-Hungary Kft. | HU-Hungary | Company | Yes | Alumnus | ESA BIC Hungary | |