| Mcmillan AS | | 2019 |
| Mco Gruppen AS | Professional & scientific | 2024 |
| Mco Yamaha Center Oslo AS | Wholesale & retail | 1988 |
| Mcom AS | Information & communication | 2018 |
| Mconsulting AS | Professional & scientific | 2020 |
| Mcpherson AS | Mining & quarrying | 2024 |
| Mcpp Project 100 AS | Financial services | 2025 |
| Mcpp Project 101 AS | Real estate | 2025 |
| Mcpp Project 102 AS | Real estate | 2025 |
| Mcpp Project 103 AS | Real estate | 2026 |
| Mcpp Project 104 AS | Real estate | 2026 |
| Mcpp Project 105 AS | Real estate | 2026 |
| Mcpp Project 106 AS | Real estate | 2026 |
| Mcpp Project 107 AS | Real estate | 2026 |
| Mcpp Project 108 AS | Real estate | 2026 |
| Mcpp Project 109 AS | Real estate | 2026 |
| Mcpp Project 110 AS | Real estate | 2026 |
| Mcpp Project 111 AS | Real estate | 2026 |
| Mcpp Project 112 AS | Real estate | 2026 |
| Mcpp Project 88 AS | Real estate | 2025 |
| Mcpp Project 97 AS | Real estate | 2025 |
| Mcpp Project 98 AS | Real estate | 2025 |
| MCR Invest AS | Real estate | 2016 |
| Mct-Psykologerna AS | Health & social care | 2023 |
| MCW Invest AS | Real estate | 2016 |
| Mcwire Energy Holding AS | | 2024 |
| MD Barber AS | Other services | 2025 |
| MD Bygg AS | Construction | 2025 |
| MD Capital AS | | 2024 |
| MD Holdco AS | Hospitality | 2022 |
| MD Holding AS | | 2026 |
| MD Invest Holding AS | | 2022 |
| MD Sales & Distribution Nuf | Wholesale & retail | 2013 |
| MD Solutions AS | Health & social care | 2011 |
| Mday AS | Education | 2021 |
| Mdbv AS | Information & communication | 2026 |
| Mdbv Holding AS | | 2026 |
| Mdbygg AS | Construction | 2016 |
| Mdco Oslo AS | Health & social care | 2004 |
| Mdco Rådgivning AS | Professional & scientific | 2008 |
| Mde Østlandet AS | Administrative & support | 2021 |
| Mdekon Holding AS | Construction | 2021 |
| MDH Arkitekter AS | Professional & scientific | 2010 |
| MDH Investments AS | | 2024 |
| MDJ AS | | 2026 |
| MDL Consult AS | Professional & scientific | 2017 |
| Mdmg AS | Professional & scientific | 2016 |
| Mdo AS | Professional & scientific | 2020 |
| Mdo Consulting AS | Professional & scientific | 2023 |
| Mdog Holding AS | Financial services | 2018 |
| Mdrh AS | Arts & recreation | 2025 |
| MDS Holding AS | Financial services | 2014 |
| MDV 169 AS | Real estate | 2026 |
| MDV63 AS | Professional & scientific | 2014 |
| MDV8 AS | Real estate | 2005 |
| Me & My Cousin CC Vest AS | Wholesale & retail | 2019 |
| Me Design AS | Financial services | 2017 |
| Me Family Office AS | | 2025 |
| Me Kapital AS | | 2026 |
| Me Myself and I Holding AS | Financial services | 2018 |
| Me Norway AS | Education | 2021 |
| Me&J AS | | 2025 |
| Mea Design Da | Professional & scientific | 2011 |
| Meaconcept AS | Professional & scientific | 2019 |
| Meadow Art & Music AS | Arts & recreation | 2015 |
| Meander AS | Professional & scientific | 2025 |
| Meander Design Da | Professional & scientific | 2005 |
| Meao AS | Wholesale & retail | 2024 |
| Meat Trade AS | Wholesale & retail | 2019 |
| Meawallet AS | Information & communication | 2012 |
| Meberg Holding AS | | 2024 |
| Meboella Music AS | Arts & recreation | 2016 |
| Mec Invest AS | Financial services | 2005 |
| Mecca Invest AS | Real estate | 2005 |
| Meccol Topco AS | | 2023 |
| Mech AS | Real estate | 2010 |
| Mechanic Arts AS | Wholesale & retail | 2024 |
| Mechman Frisør AS | Other services | 2019 |
| Mecle AS | Real estate | 2006 |
| Mecwide Nordics AS | Manufacturing | 2022 |
| Med Aid Technologies AS | Information & communication | 2024 |
| Med Andre Ord Ans | Professional & scientific | 1997 |
| Med AS | Professional & scientific | 2020 |
| Med Deg AS | Health & social care | 2026 |
| Med Dynamics AS | Health & social care | 2019 |
| Med Hjertet AS | Health & social care | 2020 |
| Med Hud Og Pels AS | | 2024 |
| Med Og Uten AS | | 2001 |
| Med Oslo AS | Health & social care | 2012 |
| Med Storm Go AS | Information & communication | 2019 |
| Med-El Nordic AS | Wholesale & retail | 2017 |
| Med-Storm Innovation AS | Manufacturing | 1998 |
| MED4YOU AS | Health & social care | 2011 |
| Medalen Handeland Holding AS | | 2025 |
| Medandreord AS | Arts & recreation | 2012 |
| Medarbeiderinvest AS | Professional & scientific | 2011 |
| Medarbeiderne AS | Health & social care | 2012 |
| Medart AS | Wholesale & retail | 1992 |
| Medbøe Holding AS | Wholesale & retail | 2021 |
| Medbør Invest AS | | 2022 |