| MTX AS | Real estate | 2016 |
| Mugio Audio AS | Manufacturing | 2024 |
| Mutable AS | | 2023 |
| Myhre Aktiva AS | | 2021 |
| Myla Holding AS | | 2024 |
| Måren Småbåtlag SA | Transport & logistics | 2019 |
| Møbelringen P Larsen AS | Wholesale & retail | 1998 |
| Nabla Invest AS | | 2019 |
| Naeva AS | Information & communication | 2018 |
| Naevdal Consulting AS | Professional & scientific | 2025 |
| Namdal Investments AS | | 2021 |
| Namtvedt Holding AS | Professional & scientific | 2019 |
| Nanopro AS | Wholesale & retail | 2025 |
| Narrowhead Records Da | Information & communication | 2009 |
| NBC Holding AS | Real estate | 2021 |
| Nedre Nøttveit 64 AS | Real estate | 2023 |
| Nedre Nøttveit AS | Real estate | 2017 |
| Neo Kids AS | Wholesale & retail | 2026 |
| Neptun Nautiske Kurssenter AS | Education | 2022 |
| Nesfossen AS | Real estate | 2019 |
| New Home AS | Manufacturing | 2013 |
| Nitasha Butikk AS | Wholesale & retail | 2019 |
| Njål Gravelseter AS | Information & communication | 2010 |
| NMR AS | Professional & scientific | 2019 |
| Nomade Studio AS | Information & communication | 2026 |
| Norcoat AS | Other services | 2025 |
| Nordfjell Holding AS | Professional & scientific | 2005 |
| Nordpack AS | Wholesale & retail | 2023 |
| Nordre Oterveg AS | Professional & scientific | 2017 |
| Nordås Auto AS | Other services | 2019 |
| Nordås Bruk 2 AS | | 2021 |
| Nordås Bruk AS | | 2021 |
| Nordås Fargehandel AS | Wholesale & retail | 2021 |
| Nordås Industrier AS | Real estate | 2021 |
| Nordås Marina AS | Arts & recreation | 2021 |
| Nordås Prosjekt AS | Real estate | 2025 |
| Nordås Tannlegesenter AS | Health & social care | 2011 |
| Nordåsbrotet AS | Real estate | 2023 |
| Nordåsdalen 25 AS | Real estate | 2018 |
| Nordåsneset Invest AS | | 2022 |
| Nordåsvegen Boliger AS | Real estate | 2025 |
| Norges Spesialist Mopper Og Matter Utleier Ans | Administrative & support | 2020 |
| Norigo Institutt for Gruppeutvikling Og Organisasjonspsykologi AS | Education | 1969 |
| Norma Consulting AS | Professional & scientific | 2021 |
| Norsk Fletteri AS | Manufacturing | 1984 |
| Norsk Myrforvaltning AS | Administrative & support | 2021 |
| Norsk Offshore Consult Da | Professional & scientific | 1996 |
| Norteam AS | Professional & scientific | 1997 |
| North Hill Invest AS | Professional & scientific | 2014 |
| North Light AS | Wholesale & retail | 2024 |
| Norwegian Acoustics AS | Manufacturing | 2025 |
| Norwegian Contracting Center AS | Professional & scientific | 1988 |
| Norwegian Innovation Technology Group AS | Professional & scientific | 2014 |
| Norwegian Preserving Co AS | Real estate | 2019 |
| Norwegian Systems Engineering Council (Norsec) | Other services | 1999 |
| NP Pensjon AS | | 2022 |
| NPH Holding AS | Wholesale & retail | 2005 |
| Null Stress AS | Hospitality | 2022 |
| Null Stress Drift AS | Hospitality | 2020 |
| Nurheim Omsorg AS | Health & social care | 2026 |
| Nybø Veilag SA | Real estate | 2015 |
| Nye Smøråsveien 22 AS | Real estate | 2026 |
| Nye Svamø AS | Real estate | 2025 |
| Nygaard Elektro AS | Construction | 2012 |
| Nylundsveien 5 AS | Real estate | 2019 |
| Nest Trading A/S | Transport & logistics | 1988 |
| Næss HMS | Health & social care | 2014 |
| Objnr 1 AS | Real estate | 2015 |
| Oceangrid AS | Professional & scientific | 2019 |
| Oceanmooring AS | Professional & scientific | 2024 |
| Odd Arne Larsen Invest AS | Real estate | 2005 |
| Odgaard AS | Real estate | 2021 |
| Odinstad Helse Ltd Nuf | Wholesale & retail | 2004 |
| Oih Eiendom AS | Real estate | 2022 |
| Oih Holding AS | Wholesale & retail | 2022 |
| Oimacon AS | Professional & scientific | 2014 |
| Olarean Service AS | Administrative & support | 2016 |
| Ollie Pearls & Jewelery AS | Wholesale & retail | 2025 |
| Olsen Bygg & Service AS | Construction | 2022 |
| Olsen-Skogesal Utleie Og Konsulenttjenester Ans | Hospitality | 2012 |
| Omikron Holding AS | Financial services | 2015 |
| Omy Invest AS | Real estate | 2021 |
| Onarheim PM AS | Professional & scientific | 2012 |
| One Aviation Solutions AS | Education | 2025 |
| Open Circle Technology AS | Information & communication | 2026 |
| Operasjonspakke AS | Wholesale & retail | 2021 |
| Oppussing & Renovering AS | Construction | 2025 |
| Oppussing Bergen AS | Construction | 2018 |
| Orec AS | Professional & scientific | 2006 |
| Orec Reservoir Management AS | Professional & scientific | 2023 |
| Orion Offshore AS | Professional & scientific | 2017 |
| Orkide Eiendom Ans | Real estate | 2000 |
| Oro Utvikling AS | | 2018 |
| Orthos AS | Health & social care | 1987 |
| Osaki AS | | 2022 |
| Oscar Lillebøe AS | Real estate | 1971 |
| Oscar Lillebøe Engros AS | Wholesale & retail | 1984 |
| Oscar Lillebøe Holding AS | Wholesale & retail | 1998 |
| Oscar Lillebøe Utvikling AS | Real estate | 2020 |
| Osvegen 75 AS | Real estate | 1997 |