| Cateno v.o.f. | |
| Catharina Ziekenhuis | |
| CathDesign.nl | Groningen |
| Caveo | South Holland |
| CBShop | North Brabant |
| CCC Hosting | South Holland |
| CCO | North Brabant |
| CCT Europe B.V. | North Brabant |
| CCV Shop | Overijssel |
| CDS-Electronics | South Holland |
| CE-Tech Invest B.V. | |
| Cees en Co | North Holland |
| Ceeyu B.V. | |
| Celestia Satellite Test and Simulation B.V. | |
| CellPoint B.V. | |
| Cemsy Assemblies B.V. | South Holland |
| Cenline B.V. | North Brabant |
| CENNED Telecom & IT | Friesland |
| Censio-IT | Overijssel |
| Centennium B.V. | South Holland |
| Center for Computational Energy Research | North Brabant |
| CenTi | Utrecht |
| Centogene N.V. | |
| Central Times | Limburg |
| Centralpoint | Overijssel |
| Centrient Pharmaceuticals Netherlands B.V. | |
| Centrum Wiskunde & Informatica | |
| Cergentis B.V. | |
| Certified Secure B.V. | South Holland |
| Cervus ICT Diensten | Gelderland |
| Cevinio | South Holland |
| CF Consultancy | Utrecht |
| CFM Pharma B.V. | |
| cfunds.io | |
| CG Group | South Holland |
| CGE Risk Management Solutions B.V. | South Holland |
| ChainCraft | |
| Chainels B.V. | |
| ChainPoint B.V. | |
| Channable | Utrecht |
| ChannelEngine | South Holland |
| Channext | Utrecht |
| Chantal Design 92 | Limburg |
| Chargetrip | North Holland |
| Check Technologies B.V. | |
| Checklist.com B.V. | |
| Chemtrix B.V. | |
| ChipSoft B.V. | North Holland |
| CHL Netherlands B.V. | South Holland |
| Chondropeptix | Limburg |