| Christelijke Hogeschool Ede | |
| Chunk Creative Agency | North Holland |
| CICT Innovations | Utrecht |
| CIED B.V. | |
| CiMaas | Limburg |
| Cimar Electronics B.V. | Utrecht |
| CimCure | North Holland |
| Cinnamon Interactive | Friesland |
| Cinnovate | Flevoland |
| CipherMail B.V. | North Holland |
| CircleLytics | |
| Circularise | South Holland |
| CirkelAnalyse | Friesland |
| CIS-Websolutions | |
| Cisofy | |
| Cisper Electronics | Flevoland |
| CITC | |
| Cito Benelux B.V. | Gelderland |
| Cito Diagnostics | |
| Citryll | North Brabant |
| Citymesh B.V. | |
| CKM Extended | Drenthe |
| Claever Systems | Flevoland |
| Clairify B.V. | |
| Claranet Benelux B.V. | North Brabant |
| Clarify | North Holland |
| CLARQ | |
| Classic International B.V. | Limburg |
| Clean Tech Delta | |
| CleanNA B.V. | |
| Cleara Biotech B.V. | |
| Cleeng | North Holland |
| Clever Clover | North Holland |
| Clevergig | |
| Cleverware | Gelderland |
| CleVR B.V. | |
| Click | |
| Climate-KIC | North Holland |
| ClimateLaunchpad | |
| CLIQworx | Utrecht |
| Clocktimizer | Utrecht |
| ClockWise | Groningen |
| Clockworks | |
| CloseAlert | |
| Closure B.V. | |
| Cloud 9 | |
| Cloud it Out | |
| Cloud Primero | |
| Cloud Solutions | |
| Cloud++ B.V. | |