| 1000042757 | Celtonn Limited | IE-Ireland | Company | Yes | Alumnus | ESA BIC Ireland | |
| 1000042438 | CELUS GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000050125 | Cense Analytics Oy | FI-Finland | Company | Yes | Incubatee | ESA BIC Finland | |
| 1000034045 | Centrale Valutativa | IT-Italy | Company | No | Alumnus | ESA BIC Lazio | |
| 1000039469 | Cevotec GmbH | DE-Germany | Company | No | Alumnus | ESA BIC Bavaria | |
| 1000032787 | CHEXS | DK-Denmark | Company | Yes | Alumnus | ESA BIC Denmark | |
| 1000049953 | Chirp Light AG | CH-Switzerland | Company | Yes | Incubatee | ESA BIC Switzerland | |
| 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 | |
| 1000052439 | Civil Defence Services sp. z.o.o | PL-Poland | Company | Yes | Incubatee | ESA BIC Poland | |
| 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 | |
| 1000046431 | CleverHive Space Sp. z o.o. | PL-Poland | Company | Yes | Incubatee | ESA BIC Poland | |
| 1000047544 | ClimateScope s.r.o. | CZ-Czech Republic | Company | Yes | Incubatee | ESA BIC Czech Republic | |
| 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 | |