| Madlakrossen 6-8 AS | Real estate | 2005 |
| Madlalia Boligutvikling AS | Real estate | 2021 |
| Madlamark Handel AS | Real estate | 2021 |
| Madlamark Nærservice AS | Real estate | 2021 |
| Madlamark Utbyggingsselskap AS | Real estate | 2017 |
| Madland Bilverksted AS | Other services | 1984 |
| Madland Byggservice AS | Real estate | 2025 |
| Madland Elektro AS | Construction | 2005 |
| Madlastokken AS | Real estate | 1986 |
| Madlaveien 238 AS | Real estate | 1998 |
| Madlaveien 75 AS | Real estate | 2021 |
| Madora Solution AS | Wholesale & retail | 2022 |
| Madraven AS | | 2024 |
| Maersk Oil North Sea UK Limited | Administrative & support | 2016 |
| Maersk Olje Og Gas | Professional & scientific | 2010 |
| Maestro F & B AS | Hospitality | 2010 |
| Mafalda AS | Financial services | 2016 |
| Mag Investering AS | Real estate | 2005 |
| Magasinblaa AS | Real estate | 1999 |
| Magelland 1 AS | Real estate | 2017 |
| Magelland 2 AS | Real estate | 2017 |
| Magirus AS | Real estate | 2019 |
| Magiske Masker AS | Wholesale & retail | 2016 |
| Magisor AS | | 2023 |
| Magma AS | | 2021 |
| Magnet Executive Search AS | Administrative & support | 2022 |
| Magnetor AS | Professional & scientific | 2017 |
| Magnolia Investment Co. AS | | 2025 |
| Magnus Advisory AS | Professional & scientific | 2010 |
| Magnus Grøsfjeld Advokatfirma AS | Professional & scientific | 2020 |
| Magnus Lunde Holding AS | Other services | 2017 |
| Magnus O Og Wenche K Kristiansen Ans | Transport & logistics | 2004 |
| Mago Holding AS | Real estate | 2016 |
| Maguma AS | Financial services | 2007 |
| Mahini Invest AS | | 2022 |
| Mahs AS | | 2026 |
| Maiken Hovda AS | Wholesale & retail | 2008 |
| Main Holding AS | Real estate | 2015 |
| Maine Road Invest AS | Real estate | 2020 |
| Maintenance Consult AS | Professional & scientific | 2010 |
| Maintenance Management AS | Professional & scientific | 2011 |
| Maison AS | Professional & scientific | 2023 |
| Maison Sevland AS | | 2025 |
| Maivia AS | | 2019 |
| Majathe AS | Financial services | 2020 |
| Makaja AS | Financial services | 2014 |
| Make Holding AS | Real estate | 2006 |
| Makipini AS | Information & communication | 2013 |
| Maks Bemanning AS | Professional & scientific | 2018 |
| Maku Norge AS | Wholesale & retail | 1996 |
| Mal Holding AS | | 2021 |
| Malerbua Håndverk AS | Construction | 2012 |
| Maleren AS | Construction | 2020 |
| Malerfirmaet Kjetil Næss Da | Construction | 1996 |
| Malermester Geir Jakobsen AS | Construction | 2015 |
| Malermester M AS | Construction | 2025 |
| Malermester Peder E Vik AS | Construction | 2003 |
| Malermester Vegard Bru AS | Construction | 2017 |
| Malermester Walter Nilsen AS | Construction | 2008 |
| Malin Hovde AS | Other services | 2022 |
| Maliska Holding AS | Professional & scientific | 2025 |
| Malka Ans | Wholesale & retail | 2003 |
| Malling & Co Vågen AS | Real estate | 2014 |
| Malm Eftf. AS | | 2012 |
| Malmø Utvikling AS | Real estate | 2009 |
| Malwina Holding AS | | 2021 |
| Mamma Pizza Stavanger AS | Hospitality | 2026 |
| Mana Invest AS | | 2021 |
| Management 4 U AS | Administrative & support | 2015 |
| Manana Holding AS | Real estate | 2005 |
| Mancorp AS | Professional & scientific | 1998 |
| Mango Event Og Teknikk AS | Arts & recreation | 2024 |
| Manifestation AS | Real estate | 2011 |
| Manjan. AS | Real estate | 2005 |
| Mann&Bil AS | Transport & logistics | 2024 |
| Mann&Bil Holding AS | | 2026 |
| Mannene Med Kannene AS | Agriculture & fishing | 2026 |
| Mano AS | Real estate | 1997 |
| Mano Franchise AS | Hospitality | 2023 |
| Mano P7 AS | | 2023 |
| Mano Sandnes AS | Hospitality | 2021 |
| Manola AS | Real estate | 2006 |
| Mansard AS | Professional & scientific | 2019 |
| Manso Invest AS | Financial services | 2005 |
| Mantik Music Norway AS | Information & communication | 2024 |
| Mantra Film AS | Information & communication | 2022 |
| Mapi Capital AS | | 2021 |
| Maplan AS | Professional & scientific | 2020 |
| Maracan AS | Information & communication | 2023 |
| Maran Amundsen AS | Transport & logistics | 2026 |
| Maran Aurora AS | Transport & logistics | 2026 |
| Maran Current AS | Transport & logistics | 2026 |
| Maran Lambada AS | Transport & logistics | 2026 |
| Maran Nansen AS | Transport & logistics | 2026 |
| Maran Peary AS | Transport & logistics | 2026 |
| Maran Rainbow AS | Transport & logistics | 2026 |
| Maran Scott AS | Transport & logistics | 2026 |
| Maran Shuttle Tankers Norway AS | Transport & logistics | 1992 |
| Maran Tide AS | Transport & logistics | 2026 |
| Maran Wave AS | Transport & logistics | 2026 |