| Chromaviso | |
| CIM PrintTronic A/S | Central Denmark Region |
| CIM.AS | Capital Region of Denmark |
| CIMCO A/S | Capital Region of Denmark |
| Cirqle Biomedical | |
| Clarus, Company & Partners ApS | Central Denmark Region |
| Classerium A/S | |
| Clearhaus A/S | |
| Clever Choice | |
| Click in ApS | |
| Climaider | |
| Clinical Microbiomics | |
| Clockwork Reklamebureau A/S | |
| Cloud Circus ApS | North Jutland Region |
| Cloud Factory A/S | |
| Cloud123 ApS | |
| Cloudhuset A/S | |
| Cloudify | |
| CluedIn | |
| CM Network A/S | |
| Cmbio | |
| CN Group CZ, a.s. | |
| Coalescent Mobile Robotics | |
| COANA | |
| Cobham Satcom | |
| Cobiro | |
| Codafweb ApS | |
| Code3 ApS | Capital Region of Denmark |
| Codeable | |
| CodeCompany.dk | |
| CodeCreator ApS | |
| CodeDroids | Region of Southern Denmark |
| Codesealer ApS | |
| Codora | |
| Cofero Cables A/S | Capital Region of Denmark |
| Cogo ApS | |
| Coherence ApS | |
| Coignite ApS | |
| Colibo | |
| CollecTech ApS | |
| Collectia A/S | |
| Columbus | Capital Region of Denmark |
| Comadan A/S | Central Denmark Region |
| Comapping.com | Region Zealand |
| CoMaSys ApS | Region of Southern Denmark |
| COMAsystem ApS | |
| Combotope Therapeutics ApS | |
| Comcores ApS | |
| COMM2IG | Capital Region of Denmark |
| Commit Biologics ApS | |