| Martin Wold Invest AS | Construction | 2014 |
| Martine Boliginvest AS | | 2026 |
| Martman Ltd AS | Real estate | 1990 |
| Maruho AS | | 2021 |
| Masetech AS | Wholesale & retail | 2020 |
| Mattveeri Holding AS | Wholesale & retail | 2021 |
| Max Hodl AS | | 2022 |
| Medøåsen Vann Og Avløp SA | Water & waste | 2017 |
| Melli Concept AS | Professional & scientific | 2022 |
| Metiri 2 AS | Real estate | 2012 |
| MGF Holding AS | Agriculture & fishing | 2014 |
| MGG Innovation AS | Real estate | 2020 |
| Mhda Invest AS | Real estate | 2019 |
| Mihanta Trans AS | Transport & logistics | 2017 |
| Miif Eiendom AS | Real estate | 2026 |
| Mikketrix AS | | 2025 |
| Mima Invest AS | Transport & logistics | 2011 |
| Mimax AS | Construction | 2012 |
| Mimes Brønn AS | Hospitality | 2024 |
| Mindstate Solutions AS | Construction | 2019 |
| Minrute AS | Transport & logistics | 2024 |
| Mint Technology AS | | 2013 |
| Mint Technology Holding AS | Information & communication | 2000 |
| Mint Teie AS | Other services | 2022 |
| Mipxl AS | Wholesale & retail | 2024 |
| Miriam Brenne Karlsen AS | Financial services | 2016 |
| Moat AS | Administrative & support | 2021 |
| Moer Eiendom AS | Professional & scientific | 1996 |
| Moltke Invest AS | Financial services | 2015 |
| Molvig Eiendom AS | Real estate | 2021 |
| Molvig Utleie AS | Real estate | 2026 |
| Molvig Varmepumper AS | Construction | 2026 |
| Mondo Communications AS | Professional & scientific | 2012 |
| Mondo Interiør AS | Professional & scientific | 2011 |
| Monram AS | Financial services | 2005 |
| Monsoon Invest AS | | 2021 |
| Morradi Invest AS | Real estate | 2020 |
| Motoimport AS | Real estate | 2021 |
| Motorium AS | Wholesale & retail | 2024 |
| Movitec AS | Wholesale & retail | 1998 |
| Mra AS | | 2019 |
| Msi AS | Information & communication | 2011 |
| Munkerekka AS | | 2019 |
| Munkerekka Båthavn SA | Real estate | 2009 |
| Munkodden AS | Real estate | 2022 |
| Munters AS | Construction | 2021 |
| Murergutta AS | Construction | 2010 |
| Musikk & Artist Formidleren AS | Professional & scientific | 2016 |
| My Asia Eiendom AS | Real estate | 2014 |
| My Asia Holding AS | Real estate | 2014 |
| Måkeveien 2 B AS | Real estate | 1975 |
| Mølleveien 19 AS | Real estate | 2009 |
| Mølleveien 35 Eiendom AS | Real estate | 2026 |
| Mølleveien 41 AS | Real estate | 2019 |
| N Bygg AS | Construction | 2015 |
| Nakkens AS | Professional & scientific | 2015 |
| Nakling Entusiasme AS | Professional & scientific | 2014 |
| Nansetgata 24 AS | Real estate | 2020 |
| Navitas Shipping AS | Transport & logistics | 2014 |
| Nei AS | | 2021 |
| Nemus Horten Helseklinikk AS | Health & social care | 2013 |
| Nemus Nøtterøy Helseklinikk AS | Health & social care | 2014 |
| Nete Holding AS | | 2020 |
| Newconcepts AS | Professional & scientific | 2020 |
| Newhouse Holding AS | | 2020 |
| Next Signal AS | Professional & scientific | 2015 |
| Nimbl AS | Wholesale & retail | 2026 |
| NITTON93 Innredninger AS | Manufacturing | 2006 |
| NITTON93 Project AB Nuf | Professional & scientific | 2021 |
| Noki Eiendom AS | Information & communication | 2015 |
| Nopia AS | Wholesale & retail | 2026 |
| Norcam Import Export AS | Wholesale & retail | 2019 |
| Nordby & Nordby Invest AS | | 2006 |
| Norden Eiendomsutvikling AS | Real estate | 2019 |
| Norden Holding AS | Real estate | 2024 |
| Nordfornying AS | Construction | 2018 |
| Nordheim Borgheim AS | Real estate | 2024 |
| Nordic Family Office AS | Education | 2023 |
| Nordic Finans AS | Financial services | 1974 |
| Nordic Frakt AS | Transport & logistics | 2026 |
| Nordic Holst Holding AS | | 2024 |
| Nordli Eiendom Invest AS | Real estate | 2022 |
| Nordre Glomstein Bryggelag SA | Real estate | 1966 |
| Nordre Støyten Gård AS | Agriculture & fishing | 2016 |
| Nordwest Holding AS | Professional & scientific | 2021 |
| Norfiber AS | Wholesale & retail | 1997 |
| Norges Bygg Vest AS | Construction | 2016 |
| Norgesdesign AS | Professional & scientific | 2008 |
| Noriso AS | Professional & scientific | 2021 |
| Norita AS | Arts & recreation | 2013 |
| Norrøne Holding AS | | 2025 |
| Norsk Bygg AS | Construction | 2021 |
| Norsk Uniform AS | Wholesale & retail | 2017 |
| Northcore AI AS | Information & communication | 2024 |
| Norway Oysters AS | Agriculture & fishing | 2024 |
| Norwegian Banking AS | Real estate | 1994 |
| Norwegian Helicopter Consulting Holding AS | Professional & scientific | 2021 |
| Norwegian Media Ventures AS | Information & communication | 2010 |
| Nova Group AS | | 1986 |
| Nova People AS | Administrative & support | 1986 |