| Løvold Havpark AS | Real estate | 2015 |
| Løvold Havpark Community AS | | 2025 |
| Løvold Solution AS | Manufacturing | 2012 |
| Løvoldkaia Eiendom AS | Real estate | 2023 |
| Løwini Holding AS | Wholesale & retail | 2005 |
| Løwini Prosjekt AS | Wholesale & retail | 2000 |
| M Nordvik AS | Other services | 1991 |
| M Tjærandsen AS | Real estate | 1989 |
| M&J Drift AS | Real estate | 2025 |
| M. Krogstad Invest AS | Professional & scientific | 2024 |
| M. Vold Holding AS | Health & social care | 2026 |
| M.M.Haraldsen AS | Construction | 2025 |
| M2 Service AS | Construction | 2014 |
| M2 Sting AS | Real estate | 2016 |
| Ma Boliger AS | Real estate | 2023 |
| Ma Eiendom AS | Real estate | 2017 |
| Maa AS | Wholesale & retail | 2007 |
| Maarnes Drift AS | Administrative & support | 2024 |
| Maarnes Group AS | Administrative & support | 2024 |
| Maarnes Holding AS | Real estate | 2022 |
| Maarnes Homes AS | Real estate | 2025 |
| Mabli AS | | 2020 |
| Macci 1 AS | Wholesale & retail | 2004 |
| Macci Eiendom AS | Real estate | 2022 |
| Mad Mountain Guides AS | Administrative & support | 2024 |
| Mads AS | Financial services | 2017 |
| Magic Holding AS | Financial services | 2005 |
| Magic North AS | Arts & recreation | 2000 |
| Magma Music AS | Arts & recreation | 2009 |
| Magnetoplan AS | Wholesale & retail | 2015 |
| Magnus Hansen Eiendom AS | Real estate | 2020 |
| Magnussen Bygg AS | Construction | 2012 |
| Majr Holding AS | | 2025 |
| Makalaus AS | Hospitality | 2016 |
| Malbec Invest AS | Real estate | 2019 |
| Malens Stuss AS | | 2022 |
| Malermester Børre Knutsen AS | Construction | 2021 |
| Malermester Djupvik AS | Construction | 2021 |
| Malermester Jan Haugen AS | Construction | 1996 |
| Malermester Ole Thorbjørnsen AS | Construction | 2009 |
| Malerstua Nordland AS | Wholesale & retail | 2004 |
| Malin Nytveit Holding AS | | 2023 |
| Mam Hospitality Group AS | Hospitality | 2020 |
| Mamama AS | Real estate | 2018 |
| Mambil AS | Real estate | 2025 |
| Mamor Boligstyling AS | Professional & scientific | 2023 |
| Mannafari Da | Arts & recreation | 2006 |
| Mantis AS | Wholesale & retail | 2021 |
| Manuellterapeut Håvard Sørensen AS | Health & social care | 2020 |
| Mapli AS | Information & communication | 2026 |
| Marcialonga Arctic Races AS | | 2005 |
| Marianne Angelsen Store AS | Wholesale & retail | 2019 |
| Mariela Frisør AS | Other services | 2010 |
| Mariela Hunstad AS | Other services | 2017 |
| Marinh AS | Wholesale & retail | 2018 |
| Marit Bech Holding AS | | 2024 |
| Marits Invest AS | | 2023 |
| Markveien 18 Eiendom AS | Real estate | 1995 |
| Marmor Service AS | Professional & scientific | 2022 |
| Marmorveien Fauske AS | Real estate | 2017 |
| Martin BR Holding AS | | 2018 |
| Marysol Norge AS | Real estate | 2018 |
| Maskin & Verktøy AS | Wholesale & retail | 2003 |
| Maskin Og Teknikk AS | Manufacturing | 2024 |
| Maskinering AS | Manufacturing | 2002 |
| Maskinsupport Nord AS | | 2021 |
| Masofi Invest AS | Financial services | 2010 |
| Mat & Catering Nuf | Hospitality | 2015 |
| Matri Invest AS | | 2024 |
| Maudsdatter AS | Information & communication | 2022 |
| Max Bygg AS | Construction | 2012 |
| Maxim A/S | Real estate | 1952 |
| Maxmat Eiendom AS | Real estate | 2004 |
| Maxmat Eiendom Rønvikleira AS | Real estate | 2008 |
| MBB AS | Wholesale & retail | 2018 |
| MBS6 AS | Real estate | 2025 |
| Mclovin AS | Other services | 2022 |
| MD Boligutvikling AS | Construction | 2022 |
| Mealfood AS | Hospitality | 2024 |
| Meby Invest AS | | 2020 |
| Meco Eiendom AS | Professional & scientific | 2018 |
| Medcube AS | Information & communication | 2024 |
| MEDIA24 AS | Information & communication | 2005 |
| Medic Tool AS | Information & communication | 2021 |
| Mediegården AS | Real estate | 2007 |
| Mediprofe AS | Wholesale & retail | 2002 |
| Medmalin AS | Information & communication | 2026 |
| Mega Kiosk AS | Wholesale & retail | 2021 |
| Megaprosjekt AS | Construction | 2025 |
| Meglerhuset AS | Real estate | 2015 |
| Meidelsen AS | | 2026 |
| Meika Holding AS | | 2022 |
| Melgård Trafikkskole AS | Education | 2026 |
| Melkebaren Bodø AS | Hospitality | 2009 |
| Melkekua AS | Real estate | 2020 |
| Mellomvika 9 Eiendom AS | Real estate | 2012 |
| Melmo AS | Wholesale & retail | 2020 |
| Melå Invest AS | | 2024 |
| Melø Transport AS | Transport & logistics | 2014 |
| Menndy Holding AS | Financial services | 2005 |