| Norrøna Eiendom AS | Real estate | 1990 |
| Norrøna Utvikling AS | Real estate | 2019 |
| Norsel AS | | 2022 |
| Norsel Holding AS | | 2022 |
| Norsemet Holding AS | | 2024 |
| Norsk Bolig AS | Real estate | 2023 |
| Norsk Fagutdanning AS | Education | 2011 |
| Norsk Styrekompetanse AS | Professional & scientific | 2022 |
| Norsky AS | Information & communication | 2014 |
| North Agency AS | Transport & logistics | 2014 |
| North Estate AS | Real estate | 2025 |
| North Expeditions AS | Administrative & support | 2025 |
| North Partners AS | Professional & scientific | 2023 |
| North Peak AS | Hospitality | 2026 |
| North Property Invest AS | Real estate | 2014 |
| North Utvikling AS | Construction | 2013 |
| Northbound AS | Administrative & support | 2024 |
| Northdc AS | Information & communication | 2025 |
| Northern Homes AS | Real estate | 2024 |
| Northern Horizon AS | Administrative & support | 2019 |
| Northern Light Travel AS | Administrative & support | 2024 |
| Northern Lights Safari AS | Administrative & support | 2024 |
| Northern Norway Travel AS | Administrative & support | 2008 |
| Northern Rock AS | Professional & scientific | 2020 |
| Northride AS | Administrative & support | 2025 |
| Northshore AS | Professional & scientific | 2013 |
| Northshore Crew AS | Administrative & support | 2015 |
| Northshore Wind AS | Transport & logistics | 2023 |
| Norvarg AS | Transport & logistics | 2011 |
| Norvetuva Nord AS | Administrative & support | 2017 |
| Norveya AS | Administrative & support | 2025 |
| Norvi Resorts AS | Professional & scientific | 2020 |
| Norways Ltd | Wholesale & retail | 2017 |
| Norwegian Fjord Cruise Line AS | Transport & logistics | 2019 |
| Norwegian Fjord Explorer Lines AS | Transport & logistics | 2025 |
| Norwegians Cannabis Company AS | Wholesale & retail | 2013 |
| Noxas Ans | Arts & recreation | 2018 |
| NT Byggservice AS | Construction | 2015 |
| NT Eiendom AS | Construction | 2001 |
| NT Entreprenør AS | Construction | 1989 |
| NT Gruppen AS | Construction | 2005 |
| NT Næringsbygg AS | Real estate | 2016 |
| Numan Holding AS | Professional & scientific | 2018 |
| Nuntii AS | Information & communication | 2022 |
| Nybygg & Renovering AS | Construction | 2014 |
| Nye Bysenteret Harstad AS | Real estate | 2024 |
| Nye Desiro Holding AS | | 2024 |
| Nye Fagdykk AS | Construction | 2023 |
| Nye Grimsholm Holding AS | Agriculture & fishing | 2023 |
| Nye Jobb I Nord AS | Administrative & support | 2026 |
| Nygård Eiendom AS | Real estate | 1998 |
| Nyhavn Bergen AS | Real estate | 2016 |
| Nyheim Bolig AS | Real estate | 2021 |
| Nyheim Forvaltning AS | Real estate | 2019 |
| Nyheim Nordbyen AS | Real estate | 2021 |
| Nyheim Utleiebolig AS | Real estate | 2018 |
| Nymo Invest AS | Financial services | 2018 |
| Nymo Steinly Invest AS | Manufacturing | 2023 |
| Nystad Forvaltning AS | Real estate | 2022 |
| Nytorvet Boligpark AS | Real estate | 2019 |
| Nytru Invest AS | | 2023 |
| Nyvollen Invest AS | Manufacturing | 2005 |
| Nord Gruppen AS | Real estate | 1985 |
| Norrøna Regnskap AS | Professional & scientific | 1985 |
| Næringslivets Hus Tromsø AS | Real estate | 2011 |
| Nøstmyr AS | Real estate | 2015 |
| O.S Gruppen AS | Wholesale & retail | 1998 |
| O2XR AS | Education | 2021 |
| O2XR Ventures AS | | 2023 |
| Oao Invest AS | | 2025 |
| Oasen Tromsø AS | Wholesale & retail | 2018 |
| Obelix Invest AS | Real estate | 2016 |
| Ocean 360 AS | Information & communication | 2016 |
| Ocean Opportunities AS | Professional & scientific | 2021 |
| Oceanbox AS | Information & communication | 2021 |
| Oceanfood AS | Agriculture & fishing | 2022 |
| Oceanum AS | | 2022 |
| Octa Insight AS | Information & communication | 2023 |
| Odcons AS | Information & communication | 2020 |
| Odd Berg AS | Professional & scientific | 1985 |
| Odd Erik Hansen Invest AS | Financial services | 2005 |
| Oddgeir M Invest AS | | 2022 |
| Odeinvest AS | | 2022 |
| Odin Tours AS | Administrative & support | 2023 |
| Odinor AS | Real estate | 1990 |
| Odontia 11 AS | Health & social care | 2018 |
| Oes Eiendom AS | Real estate | 2025 |
| Oes Holding AS | Financial services | 2016 |
| Ogipro AS | | 2020 |
| Ohk Consult AS | Professional & scientific | 2005 |
| Ohs Havbruk AS | Agriculture & fishing | 2021 |
| Oio Holding AS | Wholesale & retail | 2010 |
| Okna Tours AS | Transport & logistics | 2024 |
| Oksvig AS | Agriculture & fishing | 2020 |
| Olastien 3 AS | Real estate | 2019 |
| Olav N. Lohne Holding AS | | 2025 |
| Ole Johannes Monsen AS | Real estate | 2018 |
| Ole Kristian Steien AS | | 2026 |
| Ole Nordgård AS | Real estate | 2017 |
| Oleo AS | | 2022 |