| Mahmoud Harmoush AS | | 2026 |
| Mahnin Holding AS | | 2021 |
| Maho AS | Real estate | 2005 |
| Mahodra Advokat AS | Professional & scientific | 2024 |
| Mahodra AS | Professional & scientific | 2020 |
| Mahogny Capital AS | Real estate | 2020 |
| Mahuto AS | | 2021 |
| Mai Investments AS | | 2019 |
| Mai Nergård Holding AS | | 2021 |
| Mai Produksjoner AS | Arts & recreation | 2020 |
| Mai Property AS | Real estate | 2025 |
| Maia AS | Arts & recreation | 2021 |
| Maia Håland Holding AS | Professional & scientific | 2022 |
| Maia Invest AS | | 2021 |
| Maias AS | Arts & recreation | 2015 |
| Maid for Cleaning AS | Administrative & support | 2015 |
| Maid in Norway AS | Administrative & support | 2023 |
| Maidme AS | Information & communication | 2020 |
| Maiken Foods AS | Agriculture & fishing | 2021 |
| Maiken Leonardsen AS | Other services | 2021 |
| Maiken M AS | | 2019 |
| Maiken Mo AS | | 2015 |
| Maillard Holding AS | | 2025 |
| Maillard Solutions AS | Professional & scientific | 2026 |
| Mailmojo AS | Information & communication | 2023 |
| Mailmojo Holding AS | Information & communication | 2023 |
| Mailundveien 23 AS | Real estate | 2010 |
| Maimarell Ans | Wholesale & retail | 1999 |
| Main Artery AS | Information & communication | 2024 |
| Main Boligstyling AS | Professional & scientific | 2026 |
| Main Island Production AS | Information & communication | 2003 |
| Main Pass LMC AS | Professional & scientific | 2016 |
| Main Quest AS | Information & communication | 2025 |
| Main-Halvorsen Holding AS | | 2026 |
| Maine Grip AS | Manufacturing | 2005 |
| Mainline AS | Information & communication | 2026 |
| Mainmast AS | Professional & scientific | 2021 |
| Mainstream Media Norge AS | Professional & scientific | 2020 |
| Mainstreamz AS | Administrative & support | 2012 |
| Maintane AS | Professional & scientific | 2023 |
| Mainted AS | | 2026 |
| Maintr AS | Information & communication | 2021 |
| Maintrack AS | Professional & scientific | 2023 |
| Maintrack Holding AS | | 2026 |
| Mainufer Invest AS | | 2023 |
| Maior Dignitas AS | Wholesale & retail | 2023 |
| Maipo Film AS | Information & communication | 2001 |
| Maipo Produksjon AS | Information & communication | 2020 |
| Mairen Energi AS | Professional & scientific | 2025 |
| Mais Da | Professional & scientific | 2007 |
| Maisenhølder Holding AS | | 2026 |
| Maison Chat D'Or AS | Hospitality | 2021 |
| Maison Invest AS | Real estate | 1982 |
| Maive AS | | 2025 |
| Majabe AS | Transport & logistics | 2025 |
| Majajo AS | | 2022 |
| Majamed AS | Wholesale & retail | 2012 |
| Majdek Dagligvare AS | Wholesale & retail | 2014 |
| Majen AS | Financial services | 2018 |
| Majenas Invest AS | | 2024 |
| Majm AS | | 2021 |
| Majo Impact AS | | 2022 |
| Majoar AS | Wholesale & retail | 2017 |
| Major Eiendom AS | Real estate | 2022 |
| Major Film AS | Information & communication | 2025 |
| Major Golf AS | Information & communication | 2024 |
| Major Group Holding AS | | 2023 |
| Major Holding AS | | 2020 |
| Major Invest AS | Financial services | 1988 |
| Major Town AS | Hospitality | 2016 |
| Majorana AS | Professional & scientific | 2013 |
| Majoren Flyttebyrå Oslo AS | Transport & logistics | 2016 |
| Majormed AS | Health & social care | 2013 |
| Majorservice AS | Administrative & support | 2020 |
| Majorsgruppen AS | Hospitality | 2025 |
| Majorstua Installasjon AS | Financial services | 2013 |
| Majorstua Kvinneklinikk AS | Health & social care | 2020 |
| Majorstua Renholdservice AS | Administrative & support | 2015 |
| Majorstua Systudio AS | Other services | 2016 |
| Majorstua Tannlegene AS | Health & social care | 2016 |
| Majorstuen Bardrift AS | Hospitality | 2023 |
| Majorstuen Blomster AS | Wholesale & retail | 2018 |
| Majorstuen Eiendom AS | Real estate | 2005 |
| Majorstuen Eiendomsmegling AS | Real estate | 2014 |
| Majorstuen Elektriske AS | Wholesale & retail | 2020 |
| Majorstuen Elektro AS | Financial services | 2005 |
| Majorstuen Garasjehus Ans | Real estate | 1988 |
| Majorstuen Helse AS | Health & social care | 2023 |
| Majorstuen Hotell Ans | Hospitality | 1987 |
| Majorstuen Invest AS | | 2021 |
| Majorstuen Legesenter AS | Health & social care | 2017 |
| Majorstuen Leiegaarde AS | Households | 1914 |
| Majorstuen Naprapatsenter Da | Health & social care | 2007 |
| Majorstuen Og Frogner Bolig AS | Real estate | 2025 |
| Majorstuen Psykologtjeneste AS | Health & social care | 2012 |
| Majorstuen Rens Og Renhold AS | Administrative & support | 2009 |
| Majorstuen Specsavers AS | Wholesale & retail | 2019 |
| Majorstuen Spesialist- Og Fastlegekontor AS | Real estate | 2019 |
| Majorstuen Spesialistsenter AS | Health & social care | 2020 |
| Majorstuen Takeaway AS | Hospitality | 2013 |