| Caramba App Development B.V. | |
| Carbon Equity | North Holland |
| CARD Solutions | Utrecht |
| Cardialysis | |
| CARE | North Brabant |
| CarePay International B.V. | |
| Carerix Recruitmentsoftware | South Holland |
| Careweb | Utrecht |
| Cartelle | |
| Carthago-ICT | Overijssel |
| Cartridge Depot | North Holland |
| Cartridgesshop | Utrecht |
| Cartridgestore & Copyshop | Overijssel |
| Carver Europe B.V. | |
| Casacom B.V. | Drenthe |
| Case Support B.V. | North Brabant |
| Cassini Technologies | South Holland |
| Castor Networks | Utrecht |
| Catapult Therapeutics B.V. | |
| CatchTiger | North Brabant |
| CatenaLogic | North Brabant |
| Cateno v.o.f. | |
| 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. | |
| CellPoint B.V. | |
| Cemsy Assemblies B.V. | South Holland |
| Cenline B.V. | North Brabant |
| CENNED Telecom & IT | Friesland |
| Censio-IT | Overijssel |
| Census | Gelderland |
| Centennium B.V. | South Holland |
| Center for Computational Energy Research | North Brabant |
| CenTi | Utrecht |
| Central Times | Limburg |
| Centralpoint | Overijssel |
| Centrient Pharmaceuticals | South Holland |
| Centrum Wiskunde & Informatica | |
| Cergentis B.V. | |
| Certified Secure B.V. | South Holland |
| Cervus ICT Diensten | Gelderland |
| Cevinio | South Holland |