| Mentzoni Invest AS | | 2023 |
| Mercenarius Bemanning & Kompetanse AS | Administrative & support | 2024 |
| Merkurgården AS | Real estate | 1947 |
| Mesterbygg Bodø AS | Construction | 1997 |
| Mestertakst Salten AS | Professional & scientific | 2023 |
| Meve Betong Da | Construction | 2015 |
| Mevold AS | Construction | 2023 |
| Meycon Group AS | Manufacturing | 2020 |
| MHW Bygg AS | Real estate | 2021 |
| Micdrop AS | Other services | 2007 |
| Midnattsol Eiendom AS | Real estate | 2014 |
| Midnattsol Holding AS | Other services | 2007 |
| Midnattsol Sjøcamp AS | Hospitality | 2013 |
| Mikael Solli AS | Wholesale & retail | 2017 |
| Mikalsen Takst AS | Real estate | 2019 |
| Mikrena AS | Wholesale & retail | 2007 |
| Milini Invest AS | Hospitality | 2022 |
| Miljø I Nord AS | Information & communication | 2013 |
| Miljøbarnehagen AS | Administrative & support | 2013 |
| Mime Ans | Administrative & support | 1997 |
| Mimir Analyse Og Rådgivning AS | Professional & scientific | 2021 |
| Min Fotterapeut AS | Health & social care | 2014 |
| Mindly AS | Information & communication | 2026 |
| Minnetale AS | Other services | 2025 |
| Mintrio AS | Arts & recreation | 2017 |
| Mints Invest AS | | 2023 |
| Minvillanord AS | Real estate | 2016 |
| Mirata Holding AS | | 2023 |
| Mirvaux AS | Professional & scientific | 2025 |
| Miss Poster AS | Wholesale & retail | 2026 |
| Mizar Bio AS | Professional & scientific | 2016 |
| MK Næring AS | Real estate | 2016 |
| MK1 Eiendom AS | Real estate | 2019 |
| MKM - Invest AS | Professional & scientific | 2011 |
| MNS Holding AS | | 2023 |
| Moan Utbygging AS | Real estate | 2007 |
| Mode Studio AS | Other services | 2014 |
| Moh AS | Other services | 2024 |
| Moho AS | Real estate | 2019 |
| Molobyen AS | Real estate | 2022 |
| Molobyen Utvikling AS | Real estate | 2017 |
| Moloveien 10 AS | Real estate | 2013 |
| Moloveien 10 Holding AS | Real estate | 2017 |
| Moloveien 16 AS | Real estate | 1973 |
| Moloveien 8 Bodø AS | Real estate | 2023 |
| Momentsbyvte AS | Information & communication | 2023 |
| Momentum Bodø AS | | 2007 |
| Mon Ami AS | Hospitality | 2003 |
| Mon Ami City Nord AS | Hospitality | 2011 |
| Mona Hud Og Skjønnhetspleie AS | Other services | 2019 |
| Monicas Godteributikk AS | Wholesale & retail | 2010 |
| Montero Bygg AS | Construction | 2024 |
| Monty AS | Real estate | 2005 |
| Moonstone Retreat AS | Hospitality | 2018 |
| Morild Studio Invest Limited | | 2024 |
| Morild Studio Nuf | Professional & scientific | 2024 |
| Morpheus Software AS | Information & communication | 1996 |
| Morsund Holding AS | | 2021 |
| Morten Buvik AS | Real estate | 2019 |
| Morten Haugen AS | | 2021 |
| Morten Hillestad Holding AS | Professional & scientific | 2016 |
| Morten Støver AS | Professional & scientific | 2020 |
| Mosås Holding AS | | 2020 |
| Motorvakta AS | Manufacturing | 2026 |
| Movika AS | | 2024 |
| MP Bygg AS | Construction | 2005 |
| Mstg AS | | 2021 |
| MSV Invhest AS | Agriculture & fishing | 2022 |
| MTC Invest AS | Construction | 2005 |
| Muen Invest AS | Professional & scientific | 1998 |
| Multi Norge AS | Real estate | 2005 |
| Multigården AS | Real estate | 2005 |
| Multikomp AS | Construction | 2022 |
| Multimedia Nor Da | Information & communication | 2000 |
| Multiservice Bodø AS | Transport & logistics | 2012 |
| Munin Pharma AS | Wholesale & retail | 2007 |
| Murstein Invest AS | | 2021 |
| Mutatio Evolutio AS | Professional & scientific | 2023 |
| Myhre Capital AS | Financial services | 2017 |
| Myken Apartments AS | Hospitality | 2024 |
| Myntskrinet AS | Financial services | 2017 |
| Myrdam Holding AS | | 2026 |
| Myrnes/Skålbones Eiendom AS | Real estate | 2013 |
| Myrveiengården Ans | Real estate | 2011 |
| Myrveiengården Narvik AS | Real estate | 2022 |
| Myrvoll Consulting AS | Professional & scientific | 2021 |
| Mål Og Mening AS | Information & communication | 2008 |
| Månster Maskin AS | Hospitality | 2019 |
| Måøy AS | | 2020 |
| Møllefoss AS | Real estate | 1995 |
| Mørkved Eiendom AS | Real estate | 2025 |
| Mørkved Legesenter AS | Health & social care | 2012 |
| Mørkvedbukta AS | Agriculture & fishing | 2003 |
| Mørkvedgården AS | Real estate | 2000 |
| Mørkvedhallen SA | Arts & recreation | 1989 |
| Mørkvedsentret 13 AS | Real estate | 2021 |
| Møysalen Eiendomsinvest AS | Real estate | 2011 |
| N.K.S. Kløveråsen AS | Health & social care | 2008 |
| N3 Anlegg AS | Construction | 2002 |
| Nadok Invest AS | | 2023 |