| MRM AS | Hospitality | 1995 |
| MT Mester Bygg AS | Construction | 2022 |
| MTJ Invest AS | Financial services | 2018 |
| Multipartner AS | Wholesale & retail | 2013 |
| Multitask AS | Professional & scientific | 2016 |
| Murmester Jens Aksel Christiansen AS | Construction | 2016 |
| Murvel AS | Real estate | 2012 |
| Muskan Eiendom AS | Real estate | 2019 |
| Mutitas Thaimat AS | Hospitality | 2022 |
| MW Aksjeinvest AS | | 2017 |
| My Home Planit Ans | Information & communication | 2015 |
| My Soul Aps | Professional & scientific | 2014 |
| MY3M AS | Financial services | 2016 |
| Myconto AS | Professional & scientific | 2008 |
| Mysen Euro Sko AS | Wholesale & retail | 1990 |
| Moss Flyttebyrå ANS | Transport & logistics | 1988 |
| Måleng & Banggren Da | Construction | 1993 |
| Måleng Holding AS | Real estate | 2014 |
| Møbelringen Moss AS | Wholesale & retail | 2005 |
| Møkki Holding AS | Professional & scientific | 2024 |
| Mølla Café AS | Hospitality | 2026 |
| Møllebyen Cafe Drift AS | Hospitality | 2009 |
| Møllebyen Legesenter AS | Health & social care | 2025 |
| Møllerens Hus AS | Real estate | 1993 |
| Mørk Trafikkskole Moss AS | Education | 2025 |
| Mørkhagen Låsservice AS | Construction | 2025 |
| N-Vask AS | Other services | 2016 |
| Naaj Holding AS | Wholesale & retail | 2024 |
| Nama Management & Events AS | Professional & scientific | 1990 |
| Naomi Studio AS | Other services | 2021 |
| Nasjonalgjerde AS | Wholesale & retail | 2015 |
| Naturegreens Limited Nuf | Wholesale & retail | 2011 |
| Naturrik Hage Design AS | Administrative & support | 2026 |
| Nax AS | Professional & scientific | 2023 |
| NCR Norge AS | Other services | 1952 |
| Nedsnødd AS | Administrative & support | 2020 |
| Negros Holding AS | | 2025 |
| Nemus Moss AS | Health & social care | 2013 |
| Nes Camping Jeløy AS | Hospitality | 2014 |
| Nesselquist Invest AS | | 2025 |
| Nesveien 11 AS | Real estate | 2022 |
| Nettside for Bedrift AS | Information & communication | 2026 |
| Netvision AS | Information & communication | 1991 |
| New Nordic AS | Wholesale & retail | 2000 |
| Next Education Service AS | | 2025 |
| Next Step Eiendom AS | Real estate | 2015 |
| Nexxera AS | Information & communication | 2026 |
| Nguyen Future Invest AS | Information & communication | 2023 |
| NHC Services AS | Education | 2016 |
| NHF Invest AS | | 2022 |
| Nibi Holding AS | | 2023 |
| Nibire Invest AS | | 2025 |
| Nicha AS | Information & communication | 2013 |
| Nico Trans AS | Transport & logistics | 1991 |
| Nidaros Lito AS | Manufacturing | 2020 |
| Nikolaysen Holding II AS | Financial services | 2017 |
| Nikor Group AS | Financial services | 2006 |
| Nilsen Forvaltning AS | | 2023 |
| Nilsen Transport AS | Transport & logistics | 2023 |
| Nina Merethe Felle AS | Wholesale & retail | 2020 |
| Nina Og Mari Wålberg Da | Agriculture & fishing | 2021 |
| Nina Thaimassasje AS | | 2022 |
| Ninja Whale Studios AS | Information & communication | 2016 |
| Nire AS | Real estate | 2025 |
| Nita Salong AS | Other services | 2011 |
| Nitrek AS | Wholesale & retail | 1995 |
| NJN Konsulenttjenester AS | Professional & scientific | 2016 |
| NK Multi Designs AS | Wholesale & retail | 2012 |
| No Comprendo Moss AS | Hospitality | 2025 |
| No-Limit Investments AS | Real estate | 2025 |
| Nobel Biocare Norge AS | Wholesale & retail | 2004 |
| Nolanhh Holding AS | | 2023 |
| Nor-Andrew Bygg AS | Construction | 2020 |
| Nor-Klan Gregor Zuchelowski AS | Construction | 2014 |
| Nor-Profil AS | Manufacturing | 1993 |
| Nora Foods AS | Wholesale & retail | 2002 |
| Noradriatic AS | | 2021 |
| Noramix Cooling AS | Transport & logistics | 2021 |
| Noran Holding AS | | 2021 |
| Norbygg Modul AS | Real estate | 2018 |
| Nord Dør & Vindu AS | Construction | 2024 |
| Nord Service Og Dekk AS | Other services | 2017 |
| Nord Solution AS | | 2023 |
| Nordblom Holding AS | | 2022 |
| Nordby Utvikling AS | Real estate | 2007 |
| Nordco AS | Real estate | 1989 |
| Nordexia AS | Wholesale & retail | 2018 |
| Nordic Commerce Group AS | Professional & scientific | 2024 |
| Nordic Faceart AS | Wholesale & retail | 2026 |
| Nordic Import AS | Wholesale & retail | 2014 |
| Nordic Site Services AS | Professional & scientific | 2025 |
| Nordic Story AS | Professional & scientific | 2016 |
| Nordic Vibe AS | Wholesale & retail | 2025 |
| Nordic Xtreme AS | Wholesale & retail | 2021 |
| Nordicscape AS | Wholesale & retail | 2024 |
| Nordicsync AS | Information & communication | 2026 |
| Nordin Prosjekt Og Design AS | Professional & scientific | 2026 |
| Nordisk Design AS | Wholesale & retail | 2015 |
| Nordiska Byggporten AB | Construction | 2003 |
| Nordli Consulting AS | Information & communication | 2016 |