| Mork Transport AS | Transport & logistics | 2001 |
| Mormyhr Invest AS | | 2021 |
| Moseng Holding AS | Real estate | 2005 |
| Movebeyond AS | Health & social care | 2014 |
| Mrutle Holding AS | | 2024 |
| Multisport AS | Wholesale & retail | 2024 |
| Munsj AS | Manufacturing | 2020 |
| Myraguta Amv AS | Real estate | 2020 |
| Myragutua 21 AS | Real estate | 2019 |
| Møllerhagen Gård Da | Agriculture & fishing | 2024 |
| Mølleservice Eiendom AS | | 2008 |
| N. O. Hammer Invest AS | Real estate | 2007 |
| Nala AS | Construction | 2024 |
| Nano Rocks AS | Professional & scientific | 2011 |
| Naturbygg AS | Real estate | 2010 |
| Naturbygg Entreprenør AS | Construction | 1996 |
| Naturelle Beauty AS | Other services | 2025 |
| Nedre Ljøreggen 2 AS | Real estate | 2019 |
| Nepascouvrir AS | Arts & recreation | 2019 |
| Nesstra AS | Transport & logistics | 2009 |
| Nextdrive AS | Wholesale & retail | 2024 |
| Nitteberg Holding AS | Real estate | 2015 |
| Nocebo Holding AS | Financial services | 2018 |
| Nor-Mak AS | Transport & logistics | 2016 |
| Nor-Trans AS | Transport & logistics | 2025 |
| Norbuktveien 3 AS | Real estate | 2022 |
| Norden Invest AS | Real estate | 2022 |
| Nordengruppen AS | Real estate | 2021 |
| Nordens Fjernvarme Norway AS | Construction | 2021 |
| Nordex Group AS | Administrative & support | 2025 |
| Nordic Sanitary Systems AS | Wholesale & retail | 2022 |
| Nordivex AS | Administrative & support | 2026 |
| Norsk Båtservice AS | Manufacturing | 2019 |
| Norsk Skogpleie Da | Agriculture & fishing | 2002 |
| Norske Hus Bolig AS | Real estate | 2015 |
| Norway Group AS | Administrative & support | 2018 |
| Norway Media AS | Arts & recreation | 2016 |
| NXT Level AS | Real estate | 2014 |
| Nye Akershus Miljøfôr AS | Transport & logistics | 2021 |
| Nye La Ruccola AS | Hospitality | 2020 |
| Nyork Invest AS | Administrative & support | 2018 |
| Nøstesjel AS | Wholesale & retail | 2018 |
| Oasis AS | Health & social care | 2023 |
| Obsima Holding AS | Wholesale & retail | 2005 |
| Obsima Technology AS | Wholesale & retail | 1998 |
| Odd Sæther AS | Real estate | 2002 |
| Offshore Constructor AS | Information & communication | 2020 |
| Ola Lompa AS | Manufacturing | 1984 |
| Ola Lompa Eiendom AS | Real estate | 1982 |
| Olstad Holding AS | | 2017 |
| Olstad Transport AS | Transport & logistics | 2020 |
| Omholmeide AS | Construction | 2022 |
| Onca AS | | 2021 |
| Oppistun Holding AS | | 2023 |
| Optimal Auto Øst AS | Wholesale & retail | 2026 |
| Outdoorsport AS | Wholesale & retail | 2012 |
| Paulauskas AS | Real estate | 2021 |
| Paulauskas Holding AS | | 2022 |
| Pecav Holding AS | Wholesale & retail | 2014 |
| Pecav Trade & Development AS | Wholesale & retail | 2018 |
| Pem Invest AS | Professional & scientific | 2015 |
| Pem Rådgivning AS | Professional & scientific | 2021 |
| Peonia AS | Professional & scientific | 2025 |
| Perlafotografi AS | Professional & scientific | 2022 |
| Petco Holding AS | Wholesale & retail | 2020 |
| Pilates- & Yogaakademiet AS | Education | 2023 |
| Pipe Relining AS | Financial services | 2016 |
| Polsk Arbeidsformidling Ans | Administrative & support | 2005 |
| Poort Consulting AS | Professional & scientific | 2014 |
| Portnor Bygg AS | Construction | 2013 |
| Portnor Eiendom AS | Real estate | 2020 |
| Pro Account Da | Professional & scientific | 2008 |
| Pro Holding AS | | 1997 |
| Proaccount AS | Professional & scientific | 2017 |
| Proff Auto Center AS | Other services | 2021 |
| Progressum Leira AS | Professional & scientific | 2022 |
| Proren AS | Administrative & support | 2025 |
| Protract Trading AS | Information & communication | 2024 |
| Pwhof Holding AS | | 2022 |
| Quint Essentials Holding AS | Real estate | 2023 |
| Raumergården Hotel AS | Hospitality | 1997 |
| Re Monsen Holding AS | Real estate | 2017 |
| Rego Bygg AS | Construction | 2020 |
| Rerum AS | Real estate | 2016 |
| Reuro AS | Wholesale & retail | 1980 |
| Rima Holding AS | Real estate | 2010 |
| Riwal Norge AS | Wholesale & retail | 2007 |
| Rn-Bygg AS | Construction | 2011 |
| Roed Holding AS | Financial services | 2013 |
| Roemcke Engineering AS | Professional & scientific | 2003 |
| Roland Deks Holding AS | Financial services | 2013 |
| Roma Pizza Gjerdrum AS | Hospitality | 2019 |
| Romerike Invest AS | Real estate | 2021 |
| Romerike Sveiseservice Nuf | Manufacturing | 2020 |
| Romerike Tak Og Fasade AS | Construction | 2024 |
| Romerike Tak Og Membran AS | Construction | 2023 |
| Ronsen Holding AS | Health & social care | 2008 |
| Roped Holding AS | | 2026 |
| Rosso Passione AS | Other services | 2024 |
| Royal Taste of India AS | Hospitality | 2020 |