| M2 Næringsutvikling AS | Real estate | 2021 |
| M2 Utvikling AS | Real estate | 2020 |
| M23 Bar & Restaurant AS | Hospitality | 2018 |
| M23-25 Holding AS | Real estate | 2014 |
| M28 Barnehage AS | Education | 2019 |
| M28 Bolig AS | Real estate | 2013 |
| M28 Hjemmel AS | Households | 2019 |
| M29 Holding AS | Professional & scientific | 2014 |
| M2M Music AS | Information & communication | 2024 |
| M3 Atlas Boliger 3 AS | Real estate | 2019 |
| M3 Atlas Utvikling AS | Real estate | 2019 |
| M3 Bo AS | Real estate | 2018 |
| M3 Boliger 2 AS | Real estate | 2017 |
| M3 Boliger AS | Real estate | 2016 |
| M3 Boliger Invest AS | Real estate | 2018 |
| M3 Boliger Utleie AS | Real estate | 2017 |
| M3 Forbes AS | Real estate | 2020 |
| M3 Holding AS | Real estate | 2011 |
| M3 Invest Holding AS | Real estate | 2017 |
| M3 Management AS | Real estate | 2007 |
| M3 Norefjell AS | Professional & scientific | 2019 |
| M3 Næring AS | Real estate | 2019 |
| M3 Prosjektutvikling AS | Real estate | 2026 |
| M3 Utbygging AS | Real estate | 2006 |
| M3 Utleie AS | Real estate | 2014 |
| M3 Utvikling AS | Real estate | 1978 |
| M35 Collective AS | Wholesale & retail | 2021 |
| M35 Holding AS | Real estate | 2024 |
| M37 Drift AS | Hospitality | 2023 |
| M37 Holding AS | Real estate | 2017 |
| M3HE AS | Professional & scientific | 2019 |
| M3MT Bidco AS | Information & communication | 2021 |
| M3MT Midco AS | Information & communication | 2021 |
| M3MT Topco AS | Information & communication | 2021 |
| M4 Holding AS | | 2025 |
| M5 GC Bidco AS | | 2026 |
| M5 GC Midco AS | | 2026 |
| M5 GC Topco AS | | 2026 |
| M51 Marketing AS | Professional & scientific | 2017 |
| M53 Holding AS | Professional & scientific | 2019 |
| M54 Holding AS | Professional & scientific | 2019 |
| M55 Holding AS | | 2019 |
| M56 Holding AS | | 2023 |
| M57 Holding AS | Real estate | 2001 |
| M62 Holding AS | Real estate | 2013 |
| M8 Oppdal AS | Real estate | 2018 |
| Ma & Mi AS | Health & social care | 2008 |
| Ma 85 Holding AS | | 2021 |
| Ma Apps AS | Information & communication | 2026 |
| Ma AS | Wholesale & retail | 1981 |
| Ma Benelin AS | Real estate | 2019 |
| Ma Betong AS | Construction | 2017 |
| Ma Bolig AS | Construction | 2017 |
| Ma Capital AS | | 2018 |
| Ma Colline AS | Professional & scientific | 2013 |
| Ma Colline Boutique AS | Other services | 2021 |
| Ma Consult AS | Hospitality | 2021 |
| Ma Consulting AS | Professional & scientific | 2012 |
| Ma Consults AS | Professional & scientific | 2022 |
| Ma Group AS | Administrative & support | 2019 |
| Ma Khan AS | Hospitality | 2022 |
| Ma Lowco AS | Information & communication | 2019 |
| Ma Management AS | Professional & scientific | 2010 |
| Ma Men's & Interior AS | Wholesale & retail | 2016 |
| Ma Midco AS | Professional & scientific | 2019 |
| Ma Midco II AS | Professional & scientific | 2020 |
| Ma Olstad Holding AS | | 2022 |
| Ma Oslo AS | Wholesale & retail | 2009 |
| Ma Totalbygg AS | Construction | 2006 |
| MA10 Invest AS | | 2019 |
| Maa 1 AS | Professional & scientific | 2019 |
| Maa Invest AS | | 2021 |
| Maad Invest AS | Real estate | 2008 |
| Maaemo AS | Hospitality | 2010 |
| Maako Holding AS | | 2020 |
| Maan Forward AS | | 2026 |
| Maan M & E Eiendom AS | Real estate | 2012 |
| Maana Forlag Ans | Information & communication | 1995 |
| Maanesten AS | Wholesale & retail | 2018 |
| Maanhema AS | | 2025 |
| Maanjo Holding AS | | 2026 |
| Maanster AS | | 2024 |
| Maar Drift AS | Real estate | 2023 |
| Maar Holding AS | Real estate | 2021 |
| Maar Invest AS | | 2020 |
| Maarmoxx Invest AS | | 2021 |
| Maarud Mossin Invest AS | Information & communication | 2020 |
| Maas Invest AS | | 2019 |
| Maase Capital AS | | 2021 |
| Maaz Dental AS | Health & social care | 2022 |
| Mabe Holding AS | | 2019 |
| Mabe Invest AS | Financial services | 2005 |
| Mabeeka AS | Professional & scientific | 1991 |
| Mabendix AS | Financial services | 2005 |
| Mabeni AS | Financial services | 2022 |
| Mabeta AS | Real estate | 2020 |
| Mabimi Holding AS | | 2022 |
| Mabirk AS | | 2020 |
| Mabito AS | | 2025 |
| Mablis AS | | 1997 |