| Norm Invest Fondsmæglerselskab A/S | |
| Northcap Partners | Capital Region of Denmark |
| Northstake A/S | |
| Norwin A/S | Region Zealand |
| Nosco | |
| Notify Therapeutics ApS | |
| Nova Data | Region of Southern Denmark |
| Novax A/S | Capital Region of Denmark |
| November First A/S | |
| Novo Holdings A/S | Capital Region of Denmark |
| Novo Holdings A/S | |
| Novo Nordisk A/S | |
| Novorésumé ApS | |
| Novozymes | |
| NRGi | |
| NTI A/S | Capital Region of Denmark |
| Nuuday | |
| Nørd It | Region Zealand |
| Ocean.io | |
| Octopus | Region Zealand |
| Odico | Region of Southern Denmark |
| OfficeKursus.dk | Capital Region of Denmark |
| OiSTER | Capital Region of Denmark |
| Omada | Capital Region of Denmark |
| Omnio.net ApS | |
| one.com | |
| OneHouse | Region of Southern Denmark |
| Online Marketing | Capital Region of Denmark |
| Online WebDesign ApS | Region of Southern Denmark |
| Online-Results A/S | Capital Region of Denmark |
| Onomondo ApS | |
| OnRobot A/S | |
| Op10mer | Central Denmark Region |
| Open Data DK | |
| Open Space Aarhus | Central Denmark Region |
| Openframe ApS | |
| OpenLedger | |
| Opentelehealth ApS | |
| ophavsret PH Cloud Service ApS | |
| Oracle Denmark | Capital Region of Denmark |
| Oracle Konsulent | Capital Region of Denmark |
| ORBIT | |
| ORBIT | |
| Orbit Online A/S | |
| Orbital A/S | |
| Orphazyme A/S | |
| Osalt.com | Region Zealand |
| OUI | Capital Region of Denmark |
| Our Site | Central Denmark Region |
| Oxmond Technologies | Capital Region of Denmark |