| Name | Region |
|---|---|
| Cloud.Service | South Holland |
| Cloud86 B.V. | |
| CloudDrive | |
| Cloudland B.V. | South Holland |
| CloudVPS | South Holland |
| CloudVPS B.V. | South Holland |
| Cloudwebservices | |
| Cloudwize | |
| CLS Trainingen | South Holland |
| ClubCollect | Drenthe |
| ClusterVision B.V. | North Holland |
| CM.com | North Brabant |
| CNOC Informatiesystemen | South Holland |
| CNS International | Utrecht |
| CNX Network | |
| CO2ok | |
| Coalition Capital | |
| Cobase | North Holland |
| COBOL | Gelderland |
| Cobytes | Utrecht |
| Cocosoft B.V. | Limburg |
| Codaisseur | North Holland |
| Codam | North Holland |
| Code Qube | |
| CODE14 | |
| Code54 B.V. | |
| Codeam | |
| Codean | |
| Codeglue B.V. | South Holland |
| CodeGuild | |
| Codekeeper B.V. | |
| Codeless Technology B.V. | South Holland |
| CodeSandbox B.V. | |
| Codian Robotics B.V. | |
| Coding Minds B.V. | |
| Coffee IT | |
| Cofinet | |
| Cohesion | South Holland |
| Colijn IT B.V. | Zeeland |
| Collablab | |
| Collabwith Group B.V. | |
| Collect2 | Groningen |
| Collider NL B.V. | |
| Colofon | |
| COM4 Automatisering | North Brabant |
| coMakeIT B.V. | Utrecht |
| Combined Computer Services B.V. | Utrecht |
| ComCare ICT | North Holland |
| ComControl | North Holland |
| Comercia | Gelderland |