| Nordic ID Oyj | Southwest Finland |
| Nordic IT Solutions Oy | Southwest Finland |
| Nordic Link Building Oy | |
| Nordic TeleCom Oy | |
| Nordic Umami Company | |
| Nordic XR Startups Oy | |
| NordicNinja VC | |
| Nordkapp | |
| Nordtouch Ltd | |
| Northern Antibiotics Ltd | |
| Nostetta Ventures | |
| Nosto Solutions Oy | |
| Nowhere Boy | |
| NS Advance Oy | |
| Nuuka Solutions Oy | |
| Nykla | |
| Office of the Data Protection Ombudsman | Uusimaa |
| OGOship | |
| Ohjelmistotalo Macister Oy | |
| OIKIO Oy | |
| Oivan Group Oy | |
| Okmetic | |
| Olfactomics | |
| Omnitele | Uusimaa |
| OncoBone Ltd | |
| One Click LCA Ltd | |
| ONEiO Cloud Oy | |
| OneStream Live | Uusimaa |
| OP Financial Group | |
| Open Ocean Partners Oy | Uusimaa |
| Optimax Henkilöstöratkaisut Oy | |
| Optiscan Oy | Uusimaa |
| OptiWatti | |
| OpusCapita Solutions Oy | |
| Oracle Finland | Uusimaa |
| Oracle User Group Finland | Uusimaa |
| Orbis Oy | Uusimaa |
| Orbis Systems Oy | |
| Orion Corporation | Uusimaa |
| OS Automation Oy | |
| Osgenic | |
| Osoite Internet | Uusimaa |
| Oulun yliopisto | North Ostrobothnia |
| Ōura Health Oy | |
| Oy Abilita Ab | Ostrobothnia |
| Oy CompleteTech Ltd | |
| Oy Keskuslaboratorio-Centrallaboratorium Ab | |
| Oy NextLog Ab | Ostrobothnia |
| Oy Samlink Ab | |
| P2X Solutions Oy | |