| Bynder | North Holland |
| Byondis | Gelderland |
| Bys Hosting | |
| BySky B.V. | Drenthe |
| BytePark | |
| Bytesnet | |
| C-DEVICE | North Holland |
| C-Track Benelux B.V. | South Holland |
| C.A.T. Automatisering B.V. | North Brabant |
| C.N. Rood B.V. | South Holland |
| C4 Software | North Brabant |
| CAB Holland B.V. | South Holland |
| Cablescan Ltd | Flevoland |
| CACI B.V. | North Holland |
| CAD Accent B.V. | North Brabant |
| CAD Factory | South Holland |
| CAD Services | Utrecht |
| CAD2M B.V. | Gelderland |
| Cadac Group | Limburg |
| CADdesign | North Brabant |
| Cadix | Utrecht |
| CADkoop | North Brabant |
| Cadmes | North Brabant |
| Caelus Health | North Holland |
| Cafeetje | North Holland |
| Caiway | South Holland |
| Calago | Drenthe |
| Callvoip | Groningen |
| Callvoip.shop | Groningen |
| Calmcode | |
| Calway Nederland B.V. | Groningen |
| Campus Groningen | Groningen |
| CancerGenomics.nl | |
| CANdiensten | North Holland |
| Cane | North Holland |
| Canon Nederland | North Holland |
| Canon Production Printing | |
| Capable B.V. | North Brabant |
| CapCloud Academy | |
| Capica B.V. | South Holland |
| Capital ID | Overijssel |
| Capital International Staffing B.V. | |
| Capital Mills Invest B.V. | |
| Capital T | North Holland |
| Capptions EHS Software | South Holland |
| Capsearch | North Holland |
| Captain AI | South Holland |
| Capte | |
| CaptureTech | North Holland |
| Capwell B.V. | South Holland |