| Magnesium Alloys Norway AS | Mining & quarrying | 2018 |
| Magneta AS | Real estate | 2013 |
| Magnets Holding AS | | 2023 |
| Magnews Holding AS | | 2025 |
| Magni AS | Professional & scientific | 2017 |
| Magnificent AS | | 2020 |
| Magnificent Equity AS | | 2026 |
| Magnifique Nordic AS | Professional & scientific | 2018 |
| Magnisent AS | Information & communication | 2015 |
| Magno AS | Real estate | 2022 |
| Magnolia Design AS | Professional & scientific | 2003 |
| Magnolia Holding AS | Real estate | 2005 |
| Magnolia Jazzband SA | Arts & recreation | 2017 |
| Magnolia Property AS | Construction | 2021 |
| Magnora ASA | Professional & scientific | 2001 |
| Magnora Data Center ASA | Information & communication | 2026 |
| Magnora Data Center Italy AS | Information & communication | 2026 |
| Magnora Data Center Operations AS | Information & communication | 2026 |
| Magnora Data Center Projects AS | Real estate | 2023 |
| Magnora Holding AS | Professional & scientific | 2013 |
| Magnora Metro Oslo 01 AS | | 2023 |
| Magnora Metro Oslo 3 AS | Information & communication | 2026 |
| Magnora Offshore Wind AS | Professional & scientific | 2021 |
| Magnora Scale 03 AS | Information & communication | 2026 |
| Magnora Scale 04 AS | Information & communication | 2026 |
| Magnora Scale Averøya AS | Information & communication | 2025 |
| Magnora South Africa Development AS | Professional & scientific | 2022 |
| Magnora South Africa Projects AS | Professional & scientific | 2022 |
| Magnora UK PV Holding AS | Professional & scientific | 2017 |
| Magnora Utvikling AS | Professional & scientific | 2023 |
| Magnos Somnia AS | | 2017 |
| Magnum Eiendomsmegling AS | Real estate | 2004 |
| Magnum Golf AS | Wholesale & retail | 2025 |
| Magnum Opus AS | Real estate | 2020 |
| Magnumstein Støttemurer AS | Manufacturing | 2023 |
| Magnus Arkitektur AS | Professional & scientific | 2024 |
| Magnus Barfotsgate 5 AS | Real estate | 2008 |
| Magnus Barfotsvei Eiendom AS | Real estate | 2012 |
| Magnus Beckman AS | Professional & scientific | 2022 |
| Magnus Brun Invest AS | | 2023 |
| Magnus Consult AS | Professional & scientific | 2023 |
| Magnus E-Service AS | Construction | 2013 |
| Magnus Eek Olsen Holding AS | | 2022 |
| Magnus Evjensvold AS | Health & social care | 2025 |
| Magnus Fer Inversions Holding Limited | | 2022 |
| Magnus Furset AS | Information & communication | 2021 |
| Magnus Gran-Jansen Holding AS | Financial services | 2018 |
| Magnus Halvorsen Holding AS | | 2024 |
| Magnus Heide AS | Information & communication | 2023 |
| Magnus Heide Holding AS | Information & communication | 2023 |
| Magnus Holmding AS | | 2019 |
| Magnus Lien Invest AS | | 2020 |
| Magnus Müller Lysholm AS | | 2012 |
| Magnus Og Christian Ans | Information & communication | 1999 |
| Magnus Owren Sangnes Holding AS | | 2020 |
| Magnus Poulssons Vei 7 AS | Real estate | 1991 |
| Magnus Ramm Holding AS | | 2024 |
| Magnus Steinsholt Holding AS | | 2024 |
| Magnus Thoresen Investment AS | | 2022 |
| Magnus Tidemann Holding AS | | 2024 |
| Magnus Vonen Holding AS | | 2026 |
| Magnus Østberg AS | Professional & scientific | 2015 |
| Magnusbb Holding AS | | 2025 |
| Magnuschess AS | Arts & recreation | 2006 |
| Magnussen Associates AS | Information & communication | 2016 |
| Magnussoens AS | Arts & recreation | 2019 |
| Magnusson Advokatfirma | Professional & scientific | 2012 |
| Magnusvegen 14 AS | Real estate | 2006 |
| Mago AS | | 2020 |
| Magoda AS | | 2021 |
| Magovinna AS | Information & communication | 2013 |
| Magpie AS | Professional & scientific | 2020 |
| Magpie Holding AS | Wholesale & retail | 2018 |
| Magr Management Da | Arts & recreation | 2025 |
| Magraff Media AS | Professional & scientific | 2025 |
| Magro Invest AS | Financial services | 2017 |
| Mags Agency AS | Wholesale & retail | 2023 |
| Mags Innovation AS | | 2024 |
| Magtek AS | Information & communication | 2017 |
| Magtho Holding AS | Wholesale & retail | 2014 |
| Magua AS | Professional & scientific | 2005 |
| Magusi AS | | 2019 |
| Magusweb Da | Information & communication | 2006 |
| Magwest AS | Real estate | 2019 |
| Mah AS | Professional & scientific | 2025 |
| Mah Eiendom AS | Real estate | 2006 |
| Mah Holding AS | Financial services | 2014 |
| Maha Sparing AS | | 2022 |
| Maha Transport AS | Transport & logistics | 2013 |
| Mahalo Entertainment AS | Arts & recreation | 2019 |
| Mahamadamadi Da | Wholesale & retail | 2002 |
| Mahana AS | Information & communication | 2023 |
| Maharlika AS | Hospitality | 2024 |
| Mahavir Neuro AS | Health & social care | 2023 |
| Mahbr AS | Information & communication | 2023 |
| Mahe Advicing AS | Real estate | 2022 |
| Mahe Holding AS | Real estate | 2005 |
| Mahema Ventures AS | Financial services | 2017 |
| Maheswaran Holding AS | | 2019 |
| Mahmood Holding AS | Real estate | 2005 |