| Mito På Moy AS | Other services | 2023 |
| Mitril AS | Information & communication | 2020 |
| Mke Holding AS | Education | 2005 |
| MM Service AS | Administrative & support | 2023 |
| Moava AS | Information & communication | 2011 |
| Moen Holding- AS | | 2023 |
| Mojac Holding AS | Financial services | 2011 |
| Moland Konsult AS | Real estate | 1999 |
| Momarc AS | Real estate | 1997 |
| Monsieur AS | Real estate | 2016 |
| Montech Systems AS. | Information & communication | 2022 |
| Morholt Eiendom AS | Real estate | 2007 |
| Morholt Eiendomsutvikling AS | Real estate | 2013 |
| Mormora Til Mauritz AS | Wholesale & retail | 2016 |
| Moros Holding AS | Information & communication | 2021 |
| Morten Wegner AS | Wholesale & retail | 2022 |
| Morterud Bakeri & Konditori AS | Manufacturing | 2008 |
| Morvigsanden Camping AS | Hospitality | 2020 |
| Morvik Kiosk AS | Wholesale & retail | 1993 |
| Motivated AS | Education | 2023 |
| Moum Holding AS | Real estate | 1998 |
| Movo AS | Hospitality | 2012 |
| Moy Eiendom AS | Real estate | 1997 |
| Moy Moner 85 AS | Real estate | 2023 |
| Moy Moner Holding AS | Real estate | 2015 |
| Moysand Familicamping AS | Hospitality | 2000 |
| Moysandveien SA | Real estate | 2007 |
| MS Larssen Holding AS | Wholesale & retail | 2025 |
| MT Media Produksjon Nuf | Information & communication | 2011 |
| MTP Engineering AS | Professional & scientific | 2024 |
| Multicam Media AS | Professional & scientific | 2020 |
| Multiflex AS | Information & communication | 2017 |
| Murgården AS | Real estate | 2012 |
| Murmester Sørensen AS | Construction | 2008 |
| Mydan Eiendom AS | Real estate | 2012 |
| Myra Landvik AS | Real estate | 2022 |
| Mårvegen 20 S1 AS | Real estate | 2026 |
| Mårvegen 20 S11 AS | Real estate | 2026 |
| Mårvegen 20 S2 AS | Real estate | 2026 |
| Mårvegen 20 S3 AS | Real estate | 2026 |
| Mårvegen 20 S9 AS | Real estate | 2026 |
| Møretrø Nuf | Wholesale & retail | 2009 |
| Nape Eiendom AS | Real estate | 2012 |
| Nape Kraft AS | Energy | 2012 |
| Naturmur AS | Manufacturing | 2006 |
| NCG AS | Real estate | 1984 |
| Neuroflex Robotics AS | Manufacturing | 2024 |
| Nidi AS | Information & communication | 2001 |
| Nilsen & Co AS | Construction | 1972 |
| Nilssen Invest AS | | 2023 |
| Nilssen Og Nilssen Holding AS | | 2022 |
| Nippoh AS | | 2026 |
| Nitorp AS | Information & communication | 2018 |
| Nivi Eiendom AS | Real estate | 2002 |
| No Worries AS | Financial services | 2005 |
| Nodac Regnskap AS | Professional & scientific | 2015 |
| Noevi Holding AS | | 2022 |
| Nor Ice Trading AS | Wholesale & retail | 2015 |
| Nordic Aqua Systems AS | Professional & scientific | 2020 |
| Nordic Eiendom II AS | Real estate | 2021 |
| Nordic Health and Fitness AS | Education | 2016 |
| Nordic Relations AS | Professional & scientific | 2023 |
| Nordic Snacks AS | | 2026 |
| Nordic Årn AS | Hospitality | 2025 |
| Nordøst Invest AS | Agriculture & fishing | 2023 |
| Norgesgarasjene AS | Manufacturing | 2006 |
| Noringz AS | Professional & scientific | 2024 |
| Normisjonshallen AS | Real estate | 2014 |
| Norsk Crosscarting AS | Manufacturing | 2012 |
| Norswim Frøyna Service AS | Construction | 2026 |
| Northern Research Shipping AS | Transport & logistics | 2000 |
| Nortrip AS | Professional & scientific | 2021 |
| Norwegian Fiberboard AS | Manufacturing | 2021 |
| Norwegian Modellers AS | Wholesale & retail | 2002 |
| Norwegian Paper AS | Wholesale & retail | 1998 |
| Norwegian Paper Eiendom AS | Real estate | 2019 |
| Norwegian Paper Holding AS | Wholesale & retail | 2024 |
| Notia Entreprenør AS | Real estate | 2019 |
| Novare AS | Information & communication | 1985 |
| Npu AS | Wholesale & retail | 2024 |
| Nulldag AS | | 2021 |
| Nye Hansen Oppmåling AS | Professional & scientific | 2026 |
| Nye Haven Uterestaurant Ans | Hospitality | 1995 |
| Nye Industriveien 22 AS | Real estate | 2022 |
| Nye JL Eiendom AS | Real estate | 2026 |
| Nygata 3 AS | Real estate | 2008 |
| Nyhaven Familiebarnehage AS | Education | 2022 |
| Næss Snekkeri Og Håndverkstjenester AS | Construction | 2016 |
| Nøgne Ø Det Kompromissløse Bryggeri AS | Manufacturing | 2002 |
| O. Evenstad Holding AS | Real estate | 2005 |
| O.C. Solutions AS | Information & communication | 2026 |
| Occasus Capital AS | Professional & scientific | 2000 |
| Ocean Blu AS | Administrative & support | 2023 |
| Ocean Ventus AS | Professional & scientific | 2022 |
| Ocellaris AS | Professional & scientific | 2018 |
| Odd Fellow Huset AS | Real estate | 1986 |
| Odden Bygg AS | Real estate | 2015 |
| Odden Farve & Interiør AS | Wholesale & retail | 1996 |
| Odden Gullsmie AS | Wholesale & retail | 1974 |
| Odden Helsekost AS | Wholesale & retail | 2012 |