| Map Investeringer AS | Professional & scientific | 2022 |
| Margaux.No AS | Wholesale & retail | 2020 |
| Mari-Ann Hansen AS | | 2021 |
| Marianne Antonsen Holding AS | Arts & recreation | 2020 |
| Markus Hansen AS | Construction | 2025 |
| Mathisens Blomster AS | Wholesale & retail | 2003 |
| Max Butikker Holding AS | | 2025 |
| Maxsko AS | Wholesale & retail | 2024 |
| MC Travel AS | Administrative & support | 2024 |
| MD Gruppen AS | Manufacturing | 2021 |
| ME1 Holding AS | | 2018 |
| Mechmarine Industriprosjektering AS | Professional & scientific | 1999 |
| Meditek AS | Hospitality | 1989 |
| Mektre AS | Manufacturing | 2024 |
| Mentor Helse AS | Health & social care | 2026 |
| Mercur Consulting AS | Professional & scientific | 1972 |
| Messeservice Da | Wholesale & retail | 2003 |
| Meter - Arkitektur AS | Professional & scientific | 2001 |
| Metodedata AS | Information & communication | 1993 |
| Mijn Holding AS | Real estate | 2019 |
| Miljø & Pluggrensing AS | Water & waste | 2024 |
| Minenta AS | Information & communication | 2014 |
| Mo-Jo Eiendom AS | Real estate | 2014 |
| Mo-Jo Holding AS | Real estate | 2014 |
| Montasje Byggbolaget AS | Construction | 2025 |
| Mormors Café AS | Hospitality | 2009 |
| Moss Næringssenter AS | Real estate | 2021 |
| Motvin(D) AS | Information & communication | 2023 |
| MS Digital AS | Information & communication | 2023 |
| Ms-Holding AS | Financial services | 2018 |
| Mse Multifunctional Survival Equipment AS | Manufacturing | 2020 |
| Munch Transport Ltd Nuf | Transport & logistics | 2019 |
| Museumsbygg AS | Arts & recreation | 2014 |
| Mustang Eiendom AS | Real estate | 2013 |
| Mustang Holding AS | Real estate | 2013 |
| Mye Arbeid AS | Arts & recreation | 1994 |
| Mygel Og Fanteri AS | | 2023 |
| Myrull AS | Real estate | 2025 |
| Måneproduksjoner AS | Arts & recreation | 2008 |
| Måntesino AS | Hospitality | 2018 |
| Mørcks Efterfølger AS | | 2021 |
| N3C Capital AS | Real estate | 2021 |
| Nabbetorp Bilverksted AS | Other services | 2026 |
| Nedgården Eiendom Ans | Hospitality | 2005 |
| Nettvarehuset Bumblebee Da | Wholesale & retail | 2005 |
| New Care Norway AS | Wholesale & retail | 2015 |
| Next Group Holding AS | Information & communication | 2017 |
| Nijo Invest AS | Construction | 2013 |
| Niwiro AS | Professional & scientific | 2024 |
| Niwiro Holding AS | Professional & scientific | 2022 |
| NMT Klinikken AS | Health & social care | 2024 |
| Nor Display Ans | Manufacturing | 2000 |
| Nor Serv Recycling AS | Wholesale & retail | 2004 |
| Norbom Invest AS | | 2023 |
| Nordic Aquafarms AS | Agriculture & fishing | 2021 |
| Nordic Kingfish Fredrikstad AS | Agriculture & fishing | 2014 |
| Nordic Nor AS | | 2005 |
| Nordic Stealth Gear AS | Professional & scientific | 2026 |
| Nordli AS | Wholesale & retail | 2014 |
| Nordre Glosli Miljøkompetanse AS | Professional & scientific | 2022 |
| Norsa Holding AS | | 2022 |
| Norsk HR Service AS | Professional & scientific | 2003 |
| Norsk Sikkerhetsdesign AS | Administrative & support | 2016 |
| Northman AS | Real estate | 1990 |
| Northstone Holding AS | | 2025 |
| Norumkonsult AS | Professional & scientific | 2013 |
| Norwegian AI Solutions AS | Information & communication | 2016 |
| Nostalgi Og Retro AS | Wholesale & retail | 2022 |
| Novus Dental AS | Wholesale & retail | 2014 |
| Number 7 AS | Financial services | 2017 |
| Nye Holmsbrygga AS | Real estate | 2026 |
| Nygaardsgata 3 Utvikling AS | Real estate | 2022 |
| Nøisom AS | Manufacturing | 2012 |
| Nørdalen Holding AS | Financial services | 2016 |
| Oaf Invest AS | Financial services | 2017 |
| Oddvar Brås Knekkeri AS | Information & communication | 2025 |
| Offenberg Invest AS | Real estate | 1987 |
| Olanders Recycling Tools AS | Wholesale & retail | 2016 |
| Olavesen Eiendom AS | Real estate | 2019 |
| Olavshall SA | | 2022 |
| Onsiteviewer AS | Information & communication | 2020 |
| Opes AS | Real estate | 2011 |
| Ophie Holding AS | | 2025 |
| Optima Holding AS | | 2024 |
| Optimal AS | Wholesale & retail | 2017 |
| Optimal Utleie AS | Administrative & support | 2017 |
| Orval AS | Real estate | 2001 |
| P S Vaktmesterservice AS | Construction | 2012 |
| P. Gustafsson Eiendom AS | | 2021 |
| Page Black AS | Professional & scientific | 2014 |
| Patmos AS | Manufacturing | 2012 |
| Paìdia - Kultur Og Arbeidsliv AS | Professional & scientific | 2006 |
| Peisfokus AS | Wholesale & retail | 2025 |
| Peninsula Capital AS | Arts & recreation | 2018 |
| Pers Utleieservice AS | Administrative & support | 2008 |
| Pho Holding AS | | 2013 |
| Pizzeria Østsiden AS | Hospitality | 2024 |
| PJ Eiendomsutvikling AS | Real estate | 2017 |
| PK Consult AS | Real estate | 1961 |
| Plankeby Malerservice AS | Construction | 2017 |