| Motavo Group AS | Other services | 2011 |
| Motavo Group Holding AS | | 2025 |
| Motor & Generator Service AS | Manufacturing | 2013 |
| MP Snekkerservice AS | Construction | 2009 |
| Mpi Hagepartner AS | Administrative & support | 2017 |
| MPM Eiendom AS | Real estate | 2025 |
| MR Wok Holding AS | Hospitality | 2001 |
| MRH Invest AS | Real estate | 2019 |
| MRS Chira AS | Other services | 2018 |
| MS Snekring Og Maling AS | Construction | 2025 |
| MS Tradisjon AS | Construction | 2025 |
| MSM Invest AS | Education | 2016 |
| Msure Norse Partners AS | | 2026 |
| MTR AS | Wholesale & retail | 2014 |
| Mub Holding AS | Wholesale & retail | 2018 |
| Muh Texas AS | Agriculture & fishing | 2021 |
| Mule Invest AS | Professional & scientific | 2011 |
| Muleknausen AS | Financial services | 2014 |
| Muleåsen Utbygging AS | Real estate | 2021 |
| Multifag Blikk AS | Construction | 2021 |
| Multisteel AS | Professional & scientific | 2014 |
| Murer Kai Bryntesen AS | Construction | 2011 |
| Murerfirma Gøran Jacobsen AS | Construction | 2013 |
| Murerfirma Jan Arne Tollefsen AS | Construction | 1998 |
| Murmester Gulliksen AS | Construction | 1991 |
| Mutans AS | | 2018 |
| My to AS | Real estate | 2021 |
| Myemylder AS | Arts & recreation | 2020 |
| Mynd Entreprenør AS | Construction | 2010 |
| Myo Trening Porsgrunn AS | Education | 2024 |
| Miljø-Eiendom ANS | Real estate | 1988 |
| Mælagata 58 AS | Real estate | 2010 |
| N.C. Nielsen AS | Wholesale & retail | 2000 |
| N.C. Nielsen Balling | Administrative & support | 2014 |
| Nagå AS | Real estate | 2010 |
| NAH3 AS | Real estate | 2023 |
| NAH4 AS | Real estate | 2024 |
| Najs Eiendom AS | Real estate | 2026 |
| Nakken Eiendom AS | Real estate | 1997 |
| Nakken Kapital AS | | 2025 |
| Nalumstranda AS | Real estate | 2022 |
| Nan Wan House AS | Hospitality | 2022 |
| Nansetgata 95 AS | Real estate | 2012 |
| Nathalie Simonsen Aas AS | Health & social care | 2020 |
| Nauti AS | Wholesale & retail | 2022 |
| Navisys AS | Professional & scientific | 2001 |
| Nectra AS | Professional & scientific | 2025 |
| Nedre Lunde AS | Real estate | 2019 |
| Nedre Lunde Tomt 3 AS | Real estate | 2023 |
| Nedre Lunde Tomt 4 AS | Real estate | 2023 |
| Nedre Lunde Utbygging AS | Real estate | 2019 |
| Neglboden AS | Other services | 2024 |
| Nennes Juicebar AS | Hospitality | 2014 |
| Nenset Næringspark AS | Real estate | 2007 |
| Nenset Utbygging AS | Real estate | 2018 |
| Nestangen Drift AS | Wholesale & retail | 2026 |
| Nestangen Holding AS | | 2025 |
| Neta AS | Information & communication | 2019 |
| Nettskaperne AS | Information & communication | 2020 |
| New Agra AS | Hospitality | 2014 |
| Nexify CRM Systems AS | Professional & scientific | 2025 |
| Next Horizons AS | Professional & scientific | 2024 |
| Ngidev AS | Information & communication | 2024 |
| Ngsupport Holding AS | | 2025 |
| Niax Consulting AS | Information & communication | 2025 |
| Niax Holding AS | Information & communication | 2023 |
| Nice Eiendom AS | Real estate | 2025 |
| Night & Day Eiendom AS | Administrative & support | 2026 |
| Night & Day Gruppen AS | Education | 2024 |
| Night & Day Security AS | Administrative & support | 2023 |
| Niltech AS | Information & communication | 2025 |
| Nirosta AS | | 2022 |
| Nis Consulting AS | Administrative & support | 2017 |
| Njålsveg 2 AS | Real estate | 2019 |
| Njålsvei 4-6 AS | Real estate | 1996 |
| Nle Holding AS | | 2023 |
| NML Holding AS | Wholesale & retail | 2012 |
| No More Fear AS | Education | 2016 |
| Nobel Holding AS | Real estate | 2018 |
| Noda Invest AS | Health & social care | 2015 |
| Noha AS | Financial services | 2003 |
| Nomos AS | Professional & scientific | 2026 |
| Noor Mine AS | Information & communication | 2016 |
| Nor Minerals AS | Wholesale & retail | 1997 |
| Norbekk AS | Hospitality | 2013 |
| Norbygg Eiendom AS | Real estate | 2006 |
| Nord Taksering AS | Professional & scientific | 2004 |
| Nordavind Group AS | Information & communication | 2025 |
| Nordbid Norge AS | Wholesale & retail | 2019 |
| Nordby Eiendomsinvest Da | Real estate | 2005 |
| Nordbø Utbygging AS | Real estate | 2016 |
| Nordentorget AS | Real estate | 2016 |
| Nordic Design Da | Wholesale & retail | 2002 |
| Nordic Link AS | Wholesale & retail | 2025 |
| Nordic Rip & Ship Ans | Wholesale & retail | 2026 |
| Nordic Vehicle Database AS | Information & communication | 2020 |
| Nordiscovery AS | | 2023 |
| Nordisk Tømmerbygg AS | Construction | 2024 |
| Nordium Motors AS | Wholesale & retail | 2026 |
| Nordre Borge Garasjelag SA | Transport & logistics | 2003 |