| Mact AS | | 2020 |
| Malnor AS | Professional & scientific | 2007 |
| Management for Hire Norge AS | Administrative & support | 2013 |
| Mantex Ltd AS | | 1973 |
| Maribia Invest AS | Real estate | 2022 |
| Marine 03 Consulting AS | Professional & scientific | 2019 |
| Marsel AS | | 2013 |
| Marthinsen Invest AS | Real estate | 2019 |
| Marum Executive Search AS | Administrative & support | 2006 |
| Masten Eiendom AS | Financial services | 2003 |
| Masto Holding AS | | 2019 |
| Matovi AS | Real estate | 2023 |
| Maverick Product Marketing AS | Professional & scientific | 2009 |
| Maxel AS | | 2022 |
| MCG Invest AS | Manufacturing | 2005 |
| Mclean Consulting AS | Professional & scientific | 2020 |
| Meah AS | Professional & scientific | 2009 |
| Medirad Eiendom AS | Real estate | 1987 |
| Medisinsk Informasjons Senter AS | Health & social care | 1998 |
| Medlite AS | Wholesale & retail | 2004 |
| Meijers Invest AS | | 2018 |
| Mel Asker 12 AS | Real estate | 2024 |
| Mel Asker 9 AS | Real estate | 2024 |
| Melix Eiendom AS | Real estate | 2021 |
| Melix Holding AS | Real estate | 2021 |
| Mellow AS | Real estate | 2013 |
| Merckoll Consulting AS | Professional & scientific | 2024 |
| Mester Wester & Co AS | Construction | 2014 |
| Mester Wester AS | Arts & recreation | 1999 |
| Meyer & Ma AS | Wholesale & retail | 2023 |
| Mgfconcept AS | | 2021 |
| Micla AS | Wholesale & retail | 2025 |
| Middy Eiendom AS | Real estate | 2019 |
| Milbart Invest AS | | 2026 |
| Mimis AS | Health & social care | 2012 |
| Misi AS | Professional & scientific | 2015 |
| Mistral Invest AS | | 2024 |
| Mitra Eiendom AS | Real estate | 2017 |
| MMM Holding AS | | 2015 |
| Mobo 1 AS | Real estate | 2019 |
| Mobo 2 AS | Real estate | 2019 |
| Moguls AS | Real estate | 2009 |
| Mona Fekstad Dekorasjon AS | Professional & scientific | 2015 |
| Monar Invest AS | Financial services | 2013 |
| Moni AS | | 2023 |
| Monica Kjølø Invest AS | | 2023 |
| Moswines AS | Wholesale & retail | 2013 |
| Movafagh AS | Health & social care | 2012 |
| MSH AS | | 2015 |
| Mugnetind AS | Wholesale & retail | 2015 |
| Multitainment AS | Information & communication | 1991 |
| My Visit AS | Administrative & support | 2022 |
| Mylla Consulting AS | Professional & scientific | 2012 |
| Møllergaten 38 Ans | Real estate | 1998 |
| Nagi Holding AS | Professional & scientific | 2021 |
| Namic System Software AS | Wholesale & retail | 1986 |
| Nasha AS | Real estate | 2005 |
| Navalco AS | Wholesale & retail | 1996 |
| Nesbak AS | Financial services | 2005 |
| Nesbak Bygg AS | Construction | 1969 |
| Nest-Invest A/S | Real estate | 1987 |
| Nesøya Torg AS | Real estate | 2022 |
| Net Solutions AS | Information & communication | 2025 |
| Never Reef AS | Professional & scientific | 2004 |
| Next Agency AS | Wholesale & retail | 2024 |
| Nextgen Invest AS | Financial services | 2014 |
| Nexus Capital AS | Transport & logistics | 2021 |
| Nicosnatch AS | | 2017 |
| Nili Holding AS | Financial services | 2011 |
| Nis Bil AS | Wholesale & retail | 2023 |
| Nkvo AS | | 2018 |
| Nobello AS | Real estate | 2019 |
| Nobello Emp AS | Real estate | 2022 |
| Nogean Holding AS | Construction | 2023 |
| Noise Control AS | Wholesale & retail | 1985 |
| Nomo AS | Real estate | 2021 |
| Noravindr AS | | 2024 |
| Norbiotech AS | Professional & scientific | 2013 |
| Nordic Innocare AS | Wholesale & retail | 2019 |
| Nordico Energy Consulting AS | Professional & scientific | 1991 |
| Nordstrandsveien 48B AS | Real estate | 2019 |
| Norsemen Capital Partners AS | | 2015 |
| North Voyages Ltd Nuf | Transport & logistics | 2024 |
| Numbernine. AS | Real estate | 1993 |
| Nutri Terapi AS | Health & social care | 1989 |
| Nyati AS | Professional & scientific | 2018 |
| Nye Selsa AS | | 2026 |
| Ocean Consulting AS | Professional & scientific | 2017 |
| Oceanmar AS | Financial services | 2008 |
| Odden Invest AS | | 2000 |
| Odea Design AS | Wholesale & retail | 2026 |
| Ofi Invest AS | | 2022 |
| Ogeco AS | Real estate | 2017 |
| Oggi Interiør Og Design AS | Professional & scientific | 2006 |
| Ojho AS | Real estate | 2005 |
| Olabakken Invest AS | Real estate | 2006 |
| Ole Magne Kalggard Adm AS | Health & social care | 2017 |
| Omniax Nordic AS | Information & communication | 2025 |
| One Ihr AS | Professional & scientific | 2022 |
| Oox AS | | 2026 |