| Cryptomathic A/S | Central Denmark Region |
| CSE@IT | Region Zealand |
| CSI Data | |
| CSIS Security Group A/S | Capital Region of Denmark |
| Cubit Medialine ApS | Capital Region of Denmark |
| Curasight | |
| Custimy | |
| Custimy.io | |
| Cuttles ApS | |
| CXweb ApS | |
| Cyber Farm | |
| Cyberdata.dk | |
| Cyberfusion ApS | Central Denmark Region |
| Cygnet ApS | |
| Cytoki Pharma ApS | |
| Cytovac | |
| Da-Ta-St | Central Denmark Region |
| Dahii | Capital Region of Denmark |
| Dalgas Have Net | Capital Region of Denmark |
| Dalmatic A/S | Central Denmark Region |
| Damgaard Company A/S | |
| Damm Cellular Systems A/S | Region of Southern Denmark |
| Dan BBS A/S | Capital Region of Denmark |
| Danbridge Electronics | Capital Region of Denmark |
| DanDeltaco A/S | Capital Region of Denmark |
| Dandesign | Central Denmark Region |
| DanDial Networks | North Jutland Region |
| DanDomain A/S | Central Denmark Region |
| DANDY Business Park | |
| Dania Software A/S | Region Zealand |
| Danimex Communication | Region of Southern Denmark |
| Danish Aerospace Company A/S | |
| Danish Computer Security Incident Response Team | Capital Region of Denmark |
| Danish Financial Supervisory Authority | |
| Danish Internet Exchange Point | Capital Region of Denmark |
| Danish Life Science Cluster | |
| Danish Optical Society | Capital Region of Denmark |
| Danish Security Company ApS | Region of Southern Denmark |
| Danish Tech Startups | |
| Danline | Region of Southern Denmark |
| Danline Innovation A/S | |
| Danmarks Grundforskningsfond | |
| Danmarks Medie- og Journalisthøjskole | |
| Danmarks Tekniske Universitet | Capital Region of Denmark |
| Danmarks Tekniske Universitet - Institut for Matematik og Computer Science | Capital Region of Denmark |
| Danmarks Tekniske Universitet - Quantum DTU | |
| Danmon Group A/S | Capital Region of Denmark |
| Danotek A/S | Central Denmark Region |
| Danphone A/S | North Jutland Region |
| Danpower Electronics ApS | Capital Region of Denmark |