| Callvoip.shop | Groningen |
| Cally | |
| Calmcode | |
| Calway Nederland B.V. | Groningen |
| Campus Groningen | Groningen |
| CancerGenomics.nl | |
| CANdiensten | North Holland |
| Cane | North Holland |
| Canon Nederland | North Holland |
| Canon Production Printing | |
| Cantoni Therapeutics | |
| Capable B.V. | North Brabant |
| CapCloud Academy | |
| Capica B.V. | South Holland |
| Capisoft | |
| 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 |
| Caramba App Development B.V. | |
| Carbon Equity | North Holland |
| Carbyon | |
| 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 |
| Cashfeed B.V. | |
| Cassini Technologies | South Holland |
| Cassini Technologies | |
| Castor Marine | |
| Castor Networks | Utrecht |
| Catapult Therapeutics B.V. | |
| CatchTiger | North Brabant |
| CatenaLogic | North Brabant |