| Motor Forum AS | Wholesale & retail | 1984 |
| Motrøen Eiendom AS | Real estate | 2011 |
| Mouawad Consulting AS | Professional & scientific | 2015 |
| Mouawad Holdings Company AS | Real estate | 2015 |
| Mouawad Investment AS | Real estate | 2015 |
| Mount AS | Information & communication | 2023 |
| MQH 308 Holding AS | | 2023 |
| MS Kae AS | Construction | 2024 |
| Muhlbradt Eiendom AS | Information & communication | 2005 |
| Multi Holding AS | Real estate | 2018 |
| Multi Utleie AS | Real estate | 2022 |
| Multibod AS | Real estate | 2005 |
| Multimax AS | Wholesale & retail | 2005 |
| Mur Og Flisservice AS | Construction | 2002 |
| Murmester Innlandet AS | Construction | 2021 |
| Murstad Vaagan Holding AS | | 2019 |
| Murud Seterskog Da | Agriculture & fishing | 2023 |
| Mustelidae AS | Real estate | 1998 |
| My Family Office AS | Construction | 2005 |
| Myndighetskoordinatoren AS | Professional & scientific | 2025 |
| Myrbakken Anlegg AS | Information & communication | 2023 |
| Møllestua Eiendom AS | Real estate | 2023 |
| Na Storkjøkkenutstyr AS | Hospitality | 2026 |
| Nabben Brukskunst Ans | Manufacturing | 1997 |
| Naprapat Fredrik Akre AS | Health & social care | 2023 |
| Naprapatene AS | Health & social care | 2013 |
| Narmo Holding AS | Financial services | 2017 |
| Natali Systue AS | Other services | 2025 |
| NB Invest AS | Financial services | 2005 |
| NB Utleie Elverum AS | Real estate | 2023 |
| NCC No AS | Information & communication | 2022 |
| NDT Hamar AS | Hospitality | 2025 |
| Nemeton AS | | 2024 |
| Nemus Hamar AS | Health & social care | 2025 |
| Nes-Bil Furnesvegen AS | Other services | 2020 |
| Netsight Partners Da | Information & communication | 2003 |
| Newtech Invest AS | Information & communication | 2016 |
| Nice Living AS | Real estate | 2025 |
| Nido Investment AS | | 2025 |
| Nikk AS | | 2022 |
| Nito Invest AS | Real estate | 2007 |
| Nivis AS | Wholesale & retail | 2014 |
| Njord Kapitalforvaltning AS | Financial services | 2014 |
| Nnor Hamar AS | Wholesale & retail | 2016 |
| No Label Mini AS | Wholesale & retail | 2026 |
| Nobody AS | Transport & logistics | 2026 |
| Norco Holding AS | Wholesale & retail | 2013 |
| Norco Interior AS | Wholesale & retail | 1988 |
| Norco Spectra Invest AS | Wholesale & retail | 2014 |
| Norcult AS | Wholesale & retail | 2025 |
| Nordahl Kompetanse AS | Education | 2025 |
| Nordbolig Hamar AS | Construction | 1992 |
| Nordbolig Innlandet AS | Real estate | 2005 |
| Nordhagen Seniorboliger AS | Real estate | 2022 |
| Nordic Builders Group AS | Construction | 2024 |
| Nordic Building Group AS | Wholesale & retail | 2025 |
| Nordic Cab AS | Manufacturing | 2019 |
| Nordic Viking Products AS | Wholesale & retail | 1982 |
| Nordisk Bedriftsutvikling AS | Professional & scientific | 2001 |
| Nordlys Management AS | Real estate | 2020 |
| Nordoco AS | Professional & scientific | 2013 |
| Nordstadtunet AS | Real estate | 2022 |
| Nordvikvegen 36 AS | Real estate | 2019 |
| Norgesbetong AS | Construction | 2000 |
| Norlys Arkitektur AS | Professional & scientific | 2018 |
| Normanc Holding AS | | 2026 |
| Norrøna Eiendom AS | Real estate | 1985 |
| Norsin Invest AS | Real estate | 2011 |
| Norsk Duroc AS | Agriculture & fishing | 2017 |
| Norsk Tipping AS | Arts & recreation | 1947 |
| Norsk Vann Ba | Other services | 2003 |
| Norsk Vedsentral AS | Wholesale & retail | 2020 |
| Norske Spill AS | Arts & recreation | 2009 |
| Norsvin Barnehage AS | Education | 2013 |
| Norsvin Fagrådgivning AS | Professional & scientific | 2025 |
| Norsvin International AS | Wholesale & retail | 1992 |
| Norsvin International Holding AS | Administrative & support | 2014 |
| Norsvin Invest AS | Other services | 2012 |
| Norsvin R&D AS | Professional & scientific | 2015 |
| Norsvin SA | Other services | 1958 |
| Norsvin Technology AS | Information & communication | 2024 |
| Nortiq Lab AS | Information & communication | 2026 |
| Norving Da | Transport & logistics | 2006 |
| Norweb AS | Information & communication | 2026 |
| Nova-Cure AS | Health & social care | 2015 |
| Novamind AS | Health & social care | 2025 |
| Novum Eiendom AS | Real estate | 2014 |
| NXT Learning AS | Information & communication | 2025 |
| Ny Frisør Og Velvære AS | Other services | 1993 |
| Ny Holding AS | Other services | 2023 |
| Nyborg Holding 1 AS | | 2005 |
| Nye Grønt Og Godt AS | Wholesale & retail | 2015 |
| Nye Ha Tannlege AS | Health & social care | 2026 |
| Nye Kjøkkenhuset Hamar AS | Wholesale & retail | 2013 |
| Nye Tre Nøster AS | Wholesale & retail | 2023 |
| Nygata Eiendom 1 AS | Real estate | 2008 |
| Nysveen Holding AS | Professional & scientific | 2021 |
| Nyva Consulting Da | Administrative & support | 2023 |
| O. G. Invest AS | Real estate | 2000 |
| Obit AS | Other services | 2001 |