| Madone AS | Real estate | 2021 |
| Madsen Gruppen AS | Real estate | 2025 |
| Madsen Holding AS | Information & communication | 2005 |
| Maei AS | Education | 2021 |
| Maeo AS | Professional & scientific | 2025 |
| Maffei Investment Holding AS | Professional & scientific | 2020 |
| Mafs AS | | 2023 |
| Magda AS | Hospitality | 2016 |
| Magespesialisten AS | Health & social care | 2018 |
| Magespesialisten Holding AS | Health & social care | 2018 |
| Magic Bergtatt AS | Hospitality | 2014 |
| Magic Event AS | Wholesale & retail | 2017 |
| Magic Holding Bergen AS | Hospitality | 2016 |
| Magic Hotels Bergen AS | Hospitality | 2016 |
| Magic Hotels BG AS | Hospitality | 2014 |
| Magic Hotels Holding AS | Real estate | 2017 |
| Magic K2 AS | Hospitality | 2016 |
| Magic Norway AS | Real estate | 2017 |
| Magic Personal AS | Real estate | 2015 |
| Magic Properties AS | Real estate | 1998 |
| Magic Restauranthus Kava AS | Hospitality | 2014 |
| Magic Security AS | Administrative & support | 2017 |
| Magic Villa Blanco AS | Hospitality | 2015 |
| Magisk Holding AS | | 2023 |
| Magma Fortuna AS | Real estate | 2007 |
| Magmat AS | Financial services | 2006 |
| Magne Skurtveit AS | Financial services | 2005 |
| Magnesen Media AS | Information & communication | 2024 |
| Magnus AS | Real estate | 2018 |
| Magnus Barfot Eiendom AS | Real estate | 1986 |
| Magnus Barfots Gate 12 AS | Real estate | 2012 |
| Magnus Helland AS | | 2023 |
| Magnus Legal AS | | 2024 |
| Magør Eiendom AS | Real estate | 2004 |
| Mahalo AS | Real estate | 2006 |
| Maharaja AS | Hospitality | 2007 |
| Maia Dale AS | Professional & scientific | 2025 |
| Maih Holding AS | | 2019 |
| Maim Capital AS | Professional & scientific | 2022 |
| Maison Quarante AS | Real estate | 2021 |
| Maj AS | Hospitality | 2018 |
| Majohnes AS | | 2018 |
| Makobi AS | | 2025 |
| Makos AS | Wholesale & retail | 2012 |
| Makri AS | Real estate | 2021 |
| Maksimer AS | Information & communication | 1997 |
| Malerfirma K Nilsen AS | Construction | 1992 |
| Malerfirma Oddvin Øyre AS | Construction | 2003 |
| Malfatta Invest AS | | 2021 |
| Malina Investment AS | | 2025 |
| Malmedal & Drågen Agenturer Ans | | 1989 |
| Maltho AS | Financial services | 2006 |
| Mamacita Restaurant Og Bar AS | Hospitality | 2022 |
| Mamma Mia Pizzeria Nuf | Hospitality | 2007 |
| Man Holding AS | | 2023 |
| Mana Communications AS | Professional & scientific | 2015 |
| Management Training Systems Ans | Administrative & support | 1990 |
| Manali AS | Financial services | 2002 |
| Manami AS | Professional & scientific | 2024 |
| Mangschou AS | Information & communication | 1996 |
| Manhua International AS | Administrative & support | 2022 |
| Manic Media Ans | Administrative & support | 1995 |
| Mannheimer AS | Professional & scientific | 2008 |
| Mannsverk Boliglag AS | Households | 1957 |
| Mannsverk Systue. AS | Manufacturing | 2023 |
| Manolin AS | Professional & scientific | 2018 |
| Manta Holding AS | Information & communication | 2018 |
| Mantel AS | Real estate | 1919 |
| Manuellterapeut Anne-Marit Haugland AS | Health & social care | 2024 |
| Manziemi Ngiaba Universalshop AS | Wholesale & retail | 2017 |
| Maped AS | | 2021 |
| Maramax AS | Real estate | 2025 |
| Maramax Holding AS | Real estate | 2024 |
| Marcel Frisør AS | Other services | 2018 |
| Maremma AS | Wholesale & retail | 2015 |
| Maretopco AS | Wholesale & retail | 2025 |
| Marg Bein Restaurant AS | Hospitality | 2023 |
| Margeritten Blomster Ans | Wholesale & retail | 2001 |
| Marholmen AS | Financial services | 2007 |
| Mari-Ann Invest AS | Financial services | 2017 |
| Maria AS | Financial services | 2001 |
| Maria Stenersen Holding AS | Professional & scientific | 2025 |
| Marianne Norge AS | Financial services | 2024 |
| Marianne's Butikk AS | Wholesale & retail | 2020 |
| Marihønen Gullsmie AS | Manufacturing | 2025 |
| Mariko AS | Professional & scientific | 2003 |
| Mariko II AS | Real estate | 2016 |
| Mariko III AS | Real estate | 2016 |
| Marine Benefits AS | Financial services | 2006 |
| Marine Holding AS | Transport & logistics | 1998 |
| Marine Senteret - Bergen AS | Wholesale & retail | 1991 |
| Marine Tankers Services AS | Transport & logistics | 2002 |
| Marinegaarden AS | Real estate | 2023 |
| Marineholmen AS | Real estate | 2025 |
| Marineholmen Basen AS | Real estate | 2013 |
| Marineholmen Datablokken 13-15 AS | Real estate | 2013 |
| Marineholmen Forskningspark AS | Real estate | 1985 |
| Marineholmen Lanternen AS | Real estate | 2023 |
| Marineholmen Magasinet AS | Real estate | 2007 |
| Marineholmen Merkantilen AS | Real estate | 2007 |