| Nessetgården AS | Real estate | 2026 |
| Nettfrid AS | Information & communication | 2025 |
| New Shop AS | Construction | 2011 |
| Nexar AS | | 2023 |
| Next Frontier AS | Real estate | 2015 |
| NH Hjem AS | Construction | 2019 |
| Nicast AS | Hospitality | 2023 |
| Nimas Holding AS | Other services | 2024 |
| No Limit AS | Professional & scientific | 1985 |
| Nobo Cargo AS | Transport & logistics | 2003 |
| Nor Liner Scandinavia AS | Wholesale & retail | 2016 |
| Nor-Group Holding AS | Wholesale & retail | 2005 |
| Norborn AS | Wholesale & retail | 1995 |
| Nord Eiendomstjenester AS | Construction | 2021 |
| Nord Prosjekt AS | Real estate | 2026 |
| Nordby Åkervanning SA | Agriculture & fishing | 1966 |
| Nordbysaga AS | Real estate | 2013 |
| Nordeng Drift AS | Real estate | 2020 |
| Nordeng Holding AS | Real estate | 2019 |
| Nordexa AS | Real estate | 2023 |
| Nordic Formula AS | Wholesale & retail | 2005 |
| Nordic Value AS | Wholesale & retail | 2020 |
| Nordic Vision Consulting AS | Professional & scientific | 2025 |
| Nordisk Energi AS | Wholesale & retail | 2024 |
| Nordre Follo Rørleggerbedrift AS | Construction | 2018 |
| Nordre Follo Taxi AS | Transport & logistics | 2019 |
| Norse Packaging AS | Wholesale & retail | 2025 |
| Norsk Drikke AS | Manufacturing | 2015 |
| Norske Delikatesser AS | Wholesale & retail | 2021 |
| Norwegian Soda Company AS | Manufacturing | 2021 |
| Norwegian Trading AS | Wholesale & retail | 2023 |
| Nova Konsern AS | Other services | 2011 |
| Nova Spes Barnevern AS | Health & social care | 2026 |
| Novaetritions AS | Information & communication | 2025 |
| Novi Development 2 AS | Real estate | 2013 |
| Novi Development AS | Real estate | 1998 |
| NP Containerservice AS | Transport & logistics | 2025 |
| Nthc AS | | 2022 |
| Nygårdsveien 30 AS | Real estate | 2024 |
| Nymoens Torg 9 AS | Real estate | 2016 |
| Nyx AS | Arts & recreation | 2018 |
| Nøstvedt AS | Construction | 2012 |
| Nøstvet AS | | 2014 |
| Oag Invest AS | | 2025 |
| Obleon Nuf | Information & communication | 2011 |
| Oliver & Far AS | Manufacturing | 2007 |
| Oliver 609 AS | Manufacturing | 2021 |
| Op Transport AS | Transport & logistics | 2013 |
| Or Grunn Og Service AS | Construction | 2019 |
| Ordby AS | Wholesale & retail | 2015 |
| Orrestien Barnehage AS | Education | 2009 |
| Os IT Programming AS | Information & communication | 2018 |
| Oslo & Follo Byggtjenester AS | Construction | 2019 |
| Oslo Diamantsenter AS | Wholesale & retail | 2007 |
| Oslo Drenering AS | Administrative & support | 2016 |
| Pa Ellefsen Holding AS | | 2026 |
| Pahr Entreprenør AS | Construction | 2023 |
| Parkferie AS | Administrative & support | 2011 |
| Pasop AS | Financial services | 2010 |
| Pedersen Coaching AS | Professional & scientific | 2013 |
| Periculum AS | Professional & scientific | 2021 |
| PFN Invest AS | | 2026 |
| Pioner Bilvask Og Logistikk AS | Other services | 2024 |
| Plan Holding AS | Financial services | 2018 |
| PM Invest Holding AS | | 2019 |
| Polar Apex AS | Wholesale & retail | 2022 |
| Positive Investment AS | | 2021 |
| Potoma Bygg AS | Construction | 2024 |
| Prime Bygg AS | Construction | 2021 |
| Printbroker AS | Professional & scientific | 1989 |
| Pro-Invest AS | | 2023 |
| Pro-Mas Welding AS | Manufacturing | 2021 |
| Progressionem AS | Information & communication | 2013 |
| Property P AS | Real estate | 2024 |
| Propnordic AS | Professional & scientific | 2024 |
| Protom Bygg AS | Construction | 2013 |
| Putti Design AS | Professional & scientific | 2013 |
| R-A Invest AS | Construction | 2022 |
| R.Williamsen Kran-Transport AS | Transport & logistics | 2013 |
| Raa Digital AS | Professional & scientific | 2023 |
| Raa Moments AS | Other services | 2023 |
| Radarveien 87 AS | Real estate | 2017 |
| Raja Invest AS | Transport & logistics | 2020 |
| Ramiz Safdar AS | | 2025 |
| Ramiz Safdar Entreprenør AS | | 2019 |
| Ramudden Norge AS | Administrative & support | 2014 |
| Rasfrillo Eiendom AS | Real estate | 2019 |
| Rasfrillo Invest AS | Real estate | 2005 |
| Ravenborg AS | Real estate | 2026 |
| Rebel Sound AS | Information & communication | 2021 |
| Reconor AS | Wholesale & retail | 2001 |
| Redheal AS | Wholesale & retail | 2025 |
| Reich Montage | Construction | 2022 |
| Relatio AS | Professional & scientific | 2026 |
| Rema Distribusjon Norge AS | Wholesale & retail | 2009 |
| Remda Bygg AS | Construction | 2021 |
| Rems Scandinavia Nuf | Wholesale & retail | 2010 |
| Renholds Stolthet AS | Administrative & support | 2017 |
| Rentaway AS | Information & communication | 2023 |
| Retail Consept Og Service AS | Manufacturing | 2016 |