| Master Mat AS | Hospitality | 2018 |
| Master Mat Food AS | Hospitality | 2025 |
| Masterkeg AS | Professional & scientific | 2019 |
| Matras Holding AS | | 2022 |
| Matros Kapital AS | | 2023 |
| Mattsson Bygg Og Eiendom AS | Construction | 2006 |
| Maud Aktiv AS | Transport & logistics | 2000 |
| Maurek Holding AS | Transport & logistics | 2005 |
| Mawista Holding AS | | 2024 |
| May Gundersen AS | Administrative & support | 2013 |
| Mayhem Invest AS | | 2011 |
| Maze AS | | 2022 |
| MB Group AS | Professional & scientific | 2025 |
| Mba Sales & Service AS | Manufacturing | 2015 |
| MCS AS | Administrative & support | 2016 |
| Me Eiendomsutvikling AS | Real estate | 2018 |
| Meas Eiendom AS | Real estate | 2008 |
| Medea Holding AS | Professional & scientific | 2009 |
| Medi 3 AS | Health & social care | 1986 |
| Medicalis AS | Health & social care | 2016 |
| Mediehuset Sunnmøre AS | Information & communication | 2021 |
| Medilaser AS | Wholesale & retail | 2005 |
| Medipro AS | Wholesale & retail | 2015 |
| Meenorah AS | Information & communication | 2025 |
| Mehamn Eiendom AS | Real estate | 2025 |
| Mel Invest AS | | 2022 |
| Melbye Consulting AS | Professional & scientific | 2025 |
| Mellom Konsept AS | Manufacturing | 2026 |
| Mementomori.Norge AS | Wholesale & retail | 2020 |
| Memoria AS | Professional & scientific | 2022 |
| Menozzi AS | Professional & scientific | 2022 |
| Meq Eiendomsutvikling AS | Real estate | 2019 |
| Mer Treningssenter Ålesund AS | Arts & recreation | 2016 |
| Merk AS | Real estate | 2008 |
| Merk Eiendom AS | Real estate | 2015 |
| Mermai AS | Real estate | 2023 |
| Mestada AS | Construction | 2010 |
| Mesterhjelp AS | | 2021 |
| Mestermøbler AS | Wholesale & retail | 1987 |
| Metallvarefabrikken AS | Manufacturing | 1946 |
| Metand Holding AS | | 2018 |
| Metro Lyssystemer Da | Administrative & support | 2001 |
| Mette Andestad AS | Real estate | 1989 |
| Mezzo AS | Wholesale & retail | 2008 |
| Mfo AS | | 2026 |
| Miao AS | Wholesale & retail | 2020 |
| Mid AS | Wholesale & retail | 2007 |
| Midsund Utsidevegen 57 AS | Real estate | 2021 |
| Midtbo Holding AS | | 2026 |
| Midtco AS | Real estate | 2011 |
| Midtco Invest AS | Real estate | 2003 |
| Mif III No. 11 AS | | 2021 |
| Mif III No. 13 AS | Construction | 2021 |
| Mif III No. 14 AS | Construction | 2021 |
| Mif III No. 15 AS | Construction | 2022 |
| Mif III No. 16 AS | Construction | 2022 |
| Mika Holding AS | | 2008 |
| Miljø Kompetanse AS | Water & waste | 2024 |
| Milkyway AS | Information & communication | 2023 |
| Minilager AS | Real estate | 2025 |
| Mint Eiendom AS | Real estate | 2025 |
| Mittet Gruppen AS | Real estate | 1946 |
| Mittet Gruppen Vegsund AS | Real estate | 2011 |
| Mivo AS | Real estate | 2012 |
| Mivo Eiendom AS | Real estate | 2016 |
| Mivo Holding AS | Real estate | 2008 |
| Mivo Hospitality AS | Real estate | 2022 |
| Mivo Invest AS | Real estate | 2016 |
| Mivo Prosjekt AS | Professional & scientific | 2024 |
| Mivo Vann Og Avløp AS | Construction | 2025 |
| MK Bygg AS | Construction | 2007 |
| MKM Holding AS | Manufacturing | 2019 |
| MLF Holding I AS | | 2020 |
| MLF Invest I AS | | 2019 |
| MLF Invest II AS | | 2019 |
| MM Crewing AS | Administrative & support | 2025 |
| MM Investments AS | | 2024 |
| MN Performance AS | Arts & recreation | 2012 |
| Moa Auto Care AS | Other services | 2013 |
| Moa Bingo AS | Arts & recreation | 2002 |
| Moa Fysikalske Institutt Da | Health & social care | 2011 |
| Moa Hageby AS | Real estate | 2021 |
| Moa Helsekost AS | Wholesale & retail | 2024 |
| Moa Hår AS | Other services | 2019 |
| Moa Lavpris AS | Wholesale & retail | 1990 |
| Moa Lets Eat AS | Hospitality | 1997 |
| Moa Mat AS | Wholesale & retail | 2010 |
| Moa Minilager AS | Real estate | 2026 |
| Moa Regnskap AS | Professional & scientific | 2006 |
| Moa Revisjon AS | Professional & scientific | 2007 |
| Moa Systue AS | Other services | 2015 |
| Moa Trafikkskole AS | Education | 2022 |
| Moanor AS | Hospitality | 2023 |
| Moar Capital AS | | 2014 |
| Moar Quants AS | Professional & scientific | 2017 |
| Moasund AS | Wholesale & retail | 1998 |
| Moderne Isolering AS Mias | Real estate | 1933 |
| Modo AS | Wholesale & retail | 2006 |
| Moffen Invest AS | Financial services | 2018 |
| Mojoe AS | | 2023 |