| Mabou AS | | 2004 |
| Mabra Invest AS | | 2023 |
| Mabre Invest AS | Professional & scientific | 2017 |
| Mabrocona AS | Administrative & support | 2020 |
| Mabru AS | Professional & scientific | 2010 |
| Mabrur AS | | 2020 |
| Mabu Invest AS | Professional & scientific | 2020 |
| Mac AS | | 2022 |
| Mac Gruppen AS | Real estate | 2010 |
| Macama AS | Real estate | 1999 |
| Macaron AS | Manufacturing | 2023 |
| Macase AS | Financial services | 1998 |
| Macavi Invest AS | | 2023 |
| Mace AS | Financial services | 1993 |
| Maceni AS | | 2014 |
| Machapuchare Invest AS | | 2025 |
| Machineboy AS | Information & communication | 2018 |
| Macic Invest AS | | 2023 |
| Mack Holding AS | Financial services | 2018 |
| Mack Kvartalet AS | Real estate | 2008 |
| Mack Maling AS | Construction | 2022 |
| Macks Gruppen AS | | 2025 |
| Macks Invest AS | Manufacturing | 2024 |
| Maclean AS | Other services | 2023 |
| Macleod Invest AS | | 2021 |
| Macody Holding AS | | 2020 |
| Macondo AS | Wholesale & retail | 2002 |
| Macquarie Bank Europe Designated Activity Company Nuf | Professional & scientific | 2026 |
| Macro (Europe) Limited Nuf | Real estate | 2018 |
| Macro Group AS | Information & communication | 1995 |
| Macsimum AS | Administrative & support | 1996 |
| Maczim Holding AS | | 2015 |
| Mad Arkitekter AS | Professional & scientific | 2015 |
| Mad AS | Professional & scientific | 1997 |
| Mad Capital AS | Real estate | 2024 |
| Mad Drop AS | Hospitality | 2023 |
| Mad Drop Co AS | Hospitality | 2026 |
| Mad Global AS | Professional & scientific | 2015 |
| Mad Goats AS | Education | 2015 |
| Mad Island Media AS | Professional & scientific | 2017 |
| Mad Love AS | Hospitality | 2021 |
| Mad Media AS | Professional & scientific | 2020 |
| Mad Nic Invest AS | | 2020 |
| Mad Software AS | Information & communication | 2022 |
| Madam Eiendom AS | Real estate | 2017 |
| Madam Pysj AS | Arts & recreation | 2013 |
| Madame AS | Real estate | 2010 |
| Madaster Services Norway AS | Information & communication | 2020 |
| Maddox Properties AS | Real estate | 2021 |
| Made 4 Fashion AS | Wholesale & retail | 2016 |
| Made Bay Voraa AS | Professional & scientific | 2024 |
| Made by Ans | Real estate | 2003 |
| Made by Wood AS | Professional & scientific | 2018 |
| Made for Change AS | Hospitality | 2015 |
| Made in Denmark AS | Arts & recreation | 2012 |
| Made in Denmark Holding AS | Financial services | 2017 |
| Made in Hønefoss AS | Arts & recreation | 2005 |
| Made in Norway Music Da | Arts & recreation | 2009 |
| Made in Oslo Ans | Real estate | 2003 |
| Made in Vermont AS | | 2019 |
| Made in Yourway AS | Information & communication | 2026 |
| Made Invest AS | Real estate | 2023 |
| Made IT AS | Information & communication | 1993 |
| Made Slow AS | Wholesale & retail | 2023 |
| Made With Hart Oslo AS | Professional & scientific | 2016 |
| Madein Oslo Restaurants AS | Real estate | 2016 |
| Madelli AS | Financial services | 2007 |
| Madetogrow AS | Information & communication | 2017 |
| Madetomake AS | Information & communication | 2017 |
| Madhelm Ventures AS | | 2024 |
| Madina Eiendom AS | Real estate | 2009 |
| Madinina AS | Information & communication | 2015 |
| Madisa AS | Professional & scientific | 2008 |
| Madison AS | | 2022 |
| Madison Sun AS | Professional & scientific | 2008 |
| Madisons AS | Education | 2016 |
| Madland Gruppen AS | | 2020 |
| Madland Invest AS | Real estate | 2017 |
| Madland Kraft AS | Energy | 2008 |
| Madlaveien 499 AS | Real estate | 2014 |
| Madlaveien 77 AS | Real estate | 2016 |
| Madoks Consult AS | Health & social care | 2017 |
| Madon AS | Information & communication | 2020 |
| Madonna AS | Hospitality | 2018 |
| Madonu Bygg Og Anlegg AS | Construction | 2020 |
| Madrassen Invest AS | | 2019 |
| Madre AS | | 2025 |
| Madre Holding AS | Real estate | 2023 |
| Madrid Express Limited | Transport & logistics | 2022 |
| Mads Aasgaard Invest AS | | 2018 |
| Mads Erdal Holding AS | Information & communication | 2019 |
| Mads Francis Kjeldsberg Invest AS | | 2020 |
| Mads Holding AS | | 2023 |
| Mads Holm Holding AS | | 2024 |
| Mads Kaggestad AS | Education | 2011 |
| Mads Meland AS | Real estate | 2000 |
| Mads Nordsveen AS | Professional & scientific | 2020 |
| Madschappij AS | Information & communication | 2021 |
| Madsen Consulting AS | Administrative & support | 2015 |
| Madsen Og Moe AS | Real estate | 2014 |