| MKR Labs AS | Information & communication | 2026 |
| Mlauritzen Holding AS | | 2025 |
| MMJ Holding AS | | 2021 |
| MMJ Invest AS | | 2025 |
| MNJ Holding AS | | 2021 |
| Mobility Halden AS | Wholesale & retail | 2005 |
| Modeknappen HB Nuf | Wholesale & retail | 2005 |
| Modi Holding AS | | 2019 |
| Moe Renseanlegg Drift SA | Water & waste | 2012 |
| Mog AS | | 2023 |
| Mollymood AS | Wholesale & retail | 2023 |
| Monduma AS | Professional & scientific | 2014 |
| Monsternett AS | Information & communication | 2008 |
| Montelius AS | Real estate | 2016 |
| Moriss Celtniecïba Nuf | Administrative & support | 2010 |
| Morten Juliussen Krantransport AS | Transport & logistics | 2006 |
| Mosen AS | Real estate | 2018 |
| Motz Eiendom AS | Real estate | 2018 |
| Mov Eiendom AS | Real estate | 2023 |
| MSH Eiendom AS | Real estate | 2021 |
| MSH Utvikling AS | Manufacturing | 2005 |
| MSP Holding AS | Real estate | 2017 |
| Mtabs AS | Information & communication | 2021 |
| Multiconnect AS | Administrative & support | 2002 |
| Munk Wine & Spirits AS | Wholesale & retail | 2025 |
| Muntean Holding AS | | 2022 |
| Myrberg AS | Information & communication | 2018 |
| Myrene Invest AS | Real estate | 1987 |
| Månedynen Ans | Information & communication | 2021 |
| N&S Eiendom AS | Real estate | 2006 |
| N-B Eiendom AS | Real estate | 2017 |
| Naturistbo SA | | 1977 |
| NBR Bygg AS | Construction | 2023 |
| NE Konsult AS | Professional & scientific | 2018 |
| Nedre Bankegate 28 AS | Real estate | 2022 |
| Negota AS | Professional & scientific | 2012 |
| Negota Eiendom Halden AS | Real estate | 2014 |
| Neo Experience AS | Hospitality | 2024 |
| Nesmoen Invest AS | Financial services | 2014 |
| Netsgo AS | Information & communication | 2021 |
| Nettfag AS | Education | 2025 |
| Nevropsykologisk Klinikk AS | Health & social care | 2022 |
| New AS | Wholesale & retail | 2013 |
| New Noise Album AS | Information & communication | 2020 |
| Nextlevel Solutions AS | Information & communication | 2025 |
| Nexus Profilering AS | Professional & scientific | 2022 |
| Nezoc AS | Information & communication | 2024 |
| NGH Holding AS | Real estate | 2020 |
| Nima Holding AS | | 2022 |
| Nipe Consulting AS | Professional & scientific | 2005 |
| Nivå Holding AS | | 2025 |
| Nivå Trening AS | Arts & recreation | 2021 |
| NK Kapital AS | | 2025 |
| NNC Utvikling AS | Real estate | 2006 |
| No Bolig AS | Real estate | 2025 |
| NO.1 Beverages Norway AS | Wholesale & retail | 2014 |
| Noddy Shop AS | Wholesale & retail | 2025 |
| Nor Holding Norway Ltd | Professional & scientific | 2008 |
| Nordbrøden Ans | Agriculture & fishing | 2016 |
| Nordby Gårdsbarnehage AS | Education | 2005 |
| Nordby Invest Holding AS | Transport & logistics | 2024 |
| Norden Etablering AS | Professional & scientific | 2012 |
| Nordenhaug Holding AS | | 2024 |
| Nordic Crane Kynningsrud AS | Construction | 2006 |
| Nordic Dent Østfold AS | Other services | 2019 |
| Nordic Ecom Consulting AS | Information & communication | 2024 |
| Nordic Installation Löddeköpinge AB | Construction | 2012 |
| Nordic Vet AS | Professional & scientific | 2012 |
| Nordic-Invest AS | Wholesale & retail | 2024 |
| Nordica Engineering | Construction | 2000 |
| Nordicavant Eiendom AS | Real estate | 2025 |
| Nordisk Veifrakt AS | Transport & logistics | 2026 |
| Nordlys Etterforskning AS | Administrative & support | 2023 |
| Nordsiden Anlegg AS | Construction | 2020 |
| Nordsiden Anleggseiendom AS | Real estate | 2021 |
| Nordsiden Kraft AS | Energy | 2016 |
| Nordsiden-Eiendom AS | Real estate | 2015 |
| Nordsign AB | Construction | 2007 |
| Nordsjø Idé Og Design AS | Construction | 2009 |
| Norfloss AS | Health & social care | 2024 |
| Norgeshus Ø-Bygg AS | Construction | 2019 |
| Nori Holding AS | | 2022 |
| Norina AS | Professional & scientific | 2013 |
| Norlane AS | Wholesale & retail | 2015 |
| Norling Bygg AS | Construction | 2017 |
| Norra Bohus Fastigheter Holding AS | Real estate | 2010 |
| Norsk HMS Service Da | Health & social care | 2005 |
| Norsk Kraft Og Industri AS | Real estate | 2026 |
| Norsk Vindsperre AS | Wholesale & retail | 2007 |
| Norske Skog Saugbrugs AS | Manufacturing | 2011 |
| Norskemedisinconsult AS | Administrative & support | 2023 |
| Norskhosting AS | Information & communication | 2019 |
| Norsted Invest AS | | 2021 |
| North Grey AS | Administrative & support | 2024 |
| Northerlands Translations AS | Professional & scientific | 2024 |
| Nortrend Outlet Viken AS | Wholesale & retail | 2019 |
| Norvald AS | Arts & recreation | 2005 |
| Norway Beverages AS | Wholesale & retail | 2026 |
| Norway Halal Tours AS | Hospitality | 2021 |
| Norwegian Fitness AS | Wholesale & retail | 2002 |