| M-K Invest Holding AS | | 2024 |
| M. Steiro Invest AS | Real estate | 2005 |
| M.H. Invest AS | Administrative & support | 2023 |
| Ma Kompetanse AS | Professional & scientific | 2025 |
| Maal Eiendom AS | Financial services | 2018 |
| Magne Mørk Holding AS | | 2020 |
| Maik Flach | Construction | 2009 |
| Maja Ellingsen AS | | 2026 |
| Maken Holding AS | Construction | 2008 |
| Man-Eiendom AS | Real estate | 2012 |
| Marat Burkhanshin AS | Construction | 2021 |
| Mardin Eiendom AS | Real estate | 2013 |
| Marianns Parfymeri AS | Wholesale & retail | 2007 |
| Marin Eiendom AS | Real estate | 2003 |
| Markus Torbjørnsen AS | Financial services | 2020 |
| Markveien 16 AS | Real estate | 1997 |
| Markveien 36 AS | Real estate | 2007 |
| Marte Nyborg AS | | 2021 |
| Marvin Hansen Eiendom AS | Construction | 2014 |
| Maskinproffen AS | Construction | 2020 |
| Maskinteknikk Nord AS | Manufacturing | 2015 |
| Materia Bygg AS | Construction | 2025 |
| Mek-Nor AS | Manufacturing | 2025 |
| Mer Marin AS | Professional & scientific | 2019 |
| Mercanor AS | Professional & scientific | 1990 |
| Merethe Hansen AS | | 2020 |
| Michael Kayser Steinmetz | Arts & recreation | 2008 |
| Midnight Aviation AS | Transport & logistics | 2023 |
| Milano Pizzarestaurant AS | Hospitality | 2018 |
| Milano Pizzaresturant Ans | Hospitality | 1997 |
| Minbygg AS | Construction | 2015 |
| Miscela Kaffebar AS | Hospitality | 2009 |
| Miss Monroe AS | Other services | 2012 |
| ML Ventures AS | | 2025 |
| MMT Byggservice AS | Construction | 2021 |
| Mobilt Lagerutleie AS | Administrative & support | 2025 |
| Morpe Holding AS | Financial services | 2017 |
| Morten Eilertsen Holding AS | | 2021 |
| Morten Johnsen Invest AS | Financial services | 2005 |
| Morten Steiro Holding AS | | 2023 |
| Move IT Maskin AS | Construction | 2017 |
| MP Consult AS | Construction | 2025 |
| MP Steiro Eiendom AS | Real estate | 2004 |
| MRB Group AS | Other services | 2021 |
| Mugin Invest AS | | 2019 |
| Multiservice Vesterålen AS | Construction | 2021 |
| Multivikar AS | Administrative & support | 2020 |
| Murer K G Nilsen AS | Construction | 2008 |
| MV Holmfoss AS | Administrative & support | 2011 |
| Mykland Invest AS | Financial services | 2000 |
| Mykland, Annsletta Og Sunnan Grunneierlag SA | Real estate | 2001 |
| Møysalen Eiendomsmegling AS | Real estate | 2008 |
| Narvik-Håkvik Eiendomsutvikling AS | Real estate | 2010 |
| Natal Holding AS | Wholesale & retail | 2001 |
| Natlandsgården AS | Professional & scientific | 2002 |
| Natsteinsøyra AS | Real estate | 1989 |
| Naustet Sigerfjord AS | Other services | 2019 |
| Nemus Sortland AS | Health & social care | 2026 |
| Nettrakett AS | Professional & scientific | 2014 |
| Nilsson Haras AS | Construction | 1979 |
| NMK AS | Administrative & support | 2012 |
| No Maskin AS | Construction | 2026 |
| Norbygg Nor AS | Real estate | 2023 |
| Nord Bil AS | Wholesale & retail | 2022 |
| Nord Invest Eiendom AS | Real estate | 2023 |
| Nordeng AS | Real estate | 1982 |
| Nordhagen Frakt AS | Transport & logistics | 2026 |
| Nordisk Frakt AS | Transport & logistics | 2021 |
| Nordkran AS | Administrative & support | 1999 |
| Nordkran Prefab AS | Manufacturing | 2008 |
| Nordkran Tromsø AS | Transport & logistics | 1999 |
| Nordland Rør AS | Construction | 2025 |
| Nordlyst AS | Real estate | 2017 |
| Nordsands Fjàrfestingarfelag AS | Real estate | 2008 |
| Nordskogen Barnehage SA | Education | 2001 |
| Nordteam Bygg AS | Construction | 2006 |
| Nordteam Eiendom AS | Real estate | 2009 |
| Nordtrafikk AS | Transport & logistics | 2005 |
| Noris Fisk AS | Agriculture & fishing | 2014 |
| Nornet AS | Professional & scientific | 1998 |
| Norsol Ans | Arts & recreation | 1997 |
| North Inspection AS | Professional & scientific | 2013 |
| Northsafe Solution AS | Real estate | 2025 |
| Nortind AS | Real estate | 2006 |
| Norwegian Brand House AS | Professional & scientific | 2026 |
| Ny-Jord Maskinlag AS | Administrative & support | 2022 |
| Nye Hong Kong Restaurant AS | Hospitality | 2023 |
| Nye Sham AS | Hospitality | 2020 |
| Nyland Maskin Og Transport AS | Construction | 2024 |
| NorVest AS | Information & communication | 1989 |
| Nøstviken Holding AS | | 2020 |
| Oasen AS | Real estate | 1997 |
| Oddgeir Hansen AS | Real estate | 2006 |
| Ohholding AS | | 2020 |
| Oida AS | Information & communication | 2013 |
| Ola Gullvik Holding AS | | 2026 |
| Olagutt AS | Agriculture & fishing | 1993 |
| Olav K. Ellingsen Invest AS | Financial services | 2005 |
| Olhi Fjellteknikk AS | Wholesale & retail | 2025 |
| Oljulu Holding AS | Real estate | 2016 |