| Nordic Dreams BNB AS | | 2025 |
| Nordic Dreams BNB Drift AS | Hospitality | 2026 |
| Nordic Mechanical Solutions AS | Manufacturing | 2013 |
| Nordic Motorsport AS | Wholesale & retail | 2015 |
| Nordic Storage Group AS | | 2026 |
| Nordic Track Company AS | Wholesale & retail | 2012 |
| Nordic Vida AS | Professional & scientific | 2015 |
| Nordic Wood Protection AS | Wholesale & retail | 2018 |
| Nordlys Hjem AS | Health & social care | 2025 |
| Nordmo Holding AS | Professional & scientific | 2025 |
| Nordre Eik Antennelag SA | Information & communication | 1998 |
| Norfox Medical AS | Wholesale & retail | 2017 |
| Norges Parkering AS | Real estate | 2011 |
| Norges Senior Shop AS | Wholesale & retail | 1998 |
| Norgesdugnad AS | Information & communication | 2026 |
| Norgrill AS | Wholesale & retail | 2021 |
| Normann Warset Consulting Ans | Professional & scientific | 2005 |
| Norpadel AS | Arts & recreation | 2022 |
| Norpet Norway AS | Wholesale & retail | 2024 |
| Norse NV AS | Wholesale & retail | 2026 |
| Norse Ocean Green Tech AS | Real estate | 2017 |
| Norsk Bedriftsformidling Nuf | Information & communication | 2017 |
| Norsk Eiendomsholding AS | Real estate | 1985 |
| Norsk Megling International AS | Real estate | 1984 |
| Norsk Organisasjonsservice AS | Education | 2013 |
| Nortech Marine AS | Professional & scientific | 1997 |
| Norwegian Eagles Da | Arts & recreation | 2015 |
| Norwegian Energy Trading AS | Wholesale & retail | 1996 |
| Norwegian Resource Ventures AS | Professional & scientific | 2006 |
| Norwegian Trading Group AS | Wholesale & retail | 2021 |
| Norwegian Wellness AS | | 2026 |
| Norwin AS | Wholesale & retail | 2006 |
| Nova-Dental Tønsberg AS | Health & social care | 2017 |
| Novelaklinikken Vestfold AS | Other services | 2005 |
| Nurven AS | Real estate | 2011 |
| NVE40E AS | Real estate | 2014 |
| Nye Bamboo Garden AS | Hospitality | 2015 |
| Nye Benor Holding AS | | 2026 |
| Nye Klippern AS | Real estate | 2016 |
| Nye Kristron Holding AS | | 2026 |
| Nye Sandviksvei 1 AS | Real estate | 2024 |
| Nye Schneider AS | Health & social care | 2016 |
| Nyegaard Holding AS | Real estate | 2020 |
| Nyfelt Og Strand AS | Professional & scientific | 2010 |
| Nygårdsgaten 33 AS | Real estate | 2002 |
| Nyheim Kapital AS | Real estate | 2017 |
| Nyk Saga AS | Transport & logistics | 2005 |
| Nyland Capital AS | | 2025 |
| Nylands Snekkertjenester AS | Construction | 2021 |
| Nyrerød Eiendom AS | Real estate | 2010 |
| Nystuen Randby Holding AS | | 2024 |
| Næringslivets Tjenestebyrå Ans | Administrative & support | 1995 |
| Nøsteveien 76 AS | Real estate | 2026 |
| Oa Wilhelmsen Holding AS | Real estate | 2009 |
| Oak Ridge Capital AS | Manufacturing | 2020 |
| Oak Ridge Property AS | Real estate | 2020 |
| Oas Agentur AS | Wholesale & retail | 2014 |
| Obehi Venture AS | | 2021 |
| Oc Own-Creator AS | Wholesale & retail | 2018 |
| Ocean Technologies Group Norway AS | Information & communication | 1996 |
| Odd Sture AS | Health & social care | 2003 |
| Odins Øye AS | Professional & scientific | 2004 |
| Office Holding AS | | 2022 |
| Office Konsum AS | Wholesale & retail | 1999 |
| OFFICE24 AS | Wholesale & retail | 2023 |
| Offshore Automation AS | Professional & scientific | 2006 |
| Ofh AS | | 2022 |
| Oixo AS | | 2025 |
| Ok Hi-Fi AS | Wholesale & retail | 2004 |
| Ok Industri Service Da | Administrative & support | 1989 |
| Okh AS | Real estate | 2024 |
| Oktana AS | Real estate | 2006 |
| Olai AS | Real estate | 2007 |
| Olaussen AS | Wholesale & retail | 2009 |
| Olaussen Rådgivende Ingeniørkontor AS | Professional & scientific | 1994 |
| Olcel AS | | 2026 |
| Oljemark Holding AS | | 2023 |
| Ollebukta 2 AS | Real estate | 2003 |
| Ollebukta Marina AS | Arts & recreation | 1998 |
| Olofsson Holding AS | | 2019 |
| Olwith Holding AS | | 2023 |
| Omac Invest AS | | 2020 |
| Omsorgsplan AS | Administrative & support | 2023 |
| One Step Up AS | Wholesale & retail | 2020 |
| One Trafikkskole AS | Education | 2025 |
| Oneconsult Invest AS | Real estate | 2017 |
| Onehotel AS | Professional & scientific | 2026 |
| Onyx Centersource AS | Information & communication | 2001 |
| Onyx Norway Holding AS | Information & communication | 2014 |
| Opco & Partners AS | | 2018 |
| Opplead AS | Professional & scientific | 2023 |
| Optiker Holt AS | Wholesale & retail | 2004 |
| Optimaizai.Com AS | Information & communication | 2024 |
| Orage AS | Information & communication | 2012 |
| Organic International AS | Wholesale & retail | 2020 |
| Organisasjonshjelpen AS | Administrative & support | 2005 |
| Orion Mma Academy AS | Education | 2022 |
| Orm AS | | 2021 |
| Oroquita AS | Professional & scientific | 2014 |
| Ortholab AS | Manufacturing | 2016 |