| Nidaros Kaffe AS | Wholesale & retail | 2024 |
| Nidaros Kapital AS | | 2019 |
| Nidaros KV I AS | Real estate | 2022 |
| Nidaros Legekontor Da | Real estate | 2015 |
| Nidaros Multiservice AS | Administrative & support | 2018 |
| Nidaros Musikk- Og Handverksskole AS | Education | 2017 |
| Nidaros Naprapati AS | Health & social care | 2013 |
| Nidaros Oppmåling AS | Professional & scientific | 2002 |
| Nidaros Parkering AS | Transport & logistics | 2023 |
| Nidaros Profil AS | Wholesale & retail | 2009 |
| Nidaros Properties AS | Real estate | 2020 |
| Nidaros Rådgivning AS | Professional & scientific | 2021 |
| Nidaros Sementvarefabrikk AS | Manufacturing | 2003 |
| Nidaros Shipbrokers AS | Transport & logistics | 1988 |
| Nidaros Shipping AS | Agriculture & fishing | 2017 |
| Nidaros STK AS | Real estate | 2026 |
| Nidaros Strykekvartett Da | Arts & recreation | 2010 |
| Nidaros Tour AS | Transport & logistics | 2011 |
| Nidaros TV I AS | Real estate | 2007 |
| Nidaros VB II AS | Real estate | 2021 |
| Nidaros Vedlikeholdsservice AS | Construction | 2005 |
| Nidaros Velvære AS | Other services | 2018 |
| Nidaros Vo AS | Real estate | 2024 |
| Nidaros VS AS | Real estate | 2021 |
| Nidaros Xi AS | Real estate | 2022 |
| Nidaros Xo AS | Real estate | 2021 |
| Nidaros Xxo AS | Real estate | 2022 |
| Nidaros Øyeklinikk AS | Health & social care | 2009 |
| Nidaros-Ride Taxi AS | Transport & logistics | 2024 |
| Nidarosklima AS | Construction | 2023 |
| Nidarvoll Bil AS | Administrative & support | 1994 |
| Nidarvoll Byggservice AS | Construction | 2008 |
| Nidarvoll Trevare & Innredning AS | Manufacturing | 1994 |
| Nidarø Treningssenter AS | Arts & recreation | 1999 |
| Nidelva Semicon AS | Information & communication | 2024 |
| Nidelven Holding AS | Real estate | 2020 |
| Nidelven Legekontor AS | Health & social care | 2024 |
| Nidelven Næringspark AS | Real estate | 2016 |
| Nidelven Subsea AS | Professional & scientific | 2021 |
| Nidelven Utvikling AS | Real estate | 2010 |
| Nidelven VVS AS | Construction | 2020 |
| Nidelvens Eiendomsselskab AS | Real estate | 2016 |
| Nidheim Industri AS | Construction | 2021 |
| Nielsen-Gruppen AS | Real estate | 1998 |
| Nifty AS | | 2019 |
| Nijola Invest AS | | 2021 |
| Nile AS | Real estate | 2008 |
| Nile Nesrok AS | | 2005 |
| Nilsen Snekkertjenester AS | Construction | 2026 |
| Nilsgaarden AS | Real estate | 2022 |
| Nilsig Invest AS | Professional & scientific | 2013 |
| Nilss AS | Professional & scientific | 2013 |
| Nilsson Holding AS | Real estate | 1987 |
| Nilsson Trelast AS | Wholesale & retail | 1987 |
| Nimmtec AS | Construction | 2025 |
| Ningun Extremo Da | Arts & recreation | 2010 |
| Nipro AS | Professional & scientific | 2012 |
| Nisonic AS | Information & communication | 2017 |
| Nitai Ltd Nuf | Agriculture & fishing | 2011 |
| Nitter Gruppen AS | Real estate | 2012 |
| Nitu Management AS | Professional & scientific | 2012 |
| Nizahl Invest AS | | 2022 |
| NJ Helliksen Holding AS | Wholesale & retail | 2018 |
| Njord Eiendom AS | Real estate | 2021 |
| Njotarheim AS | Professional & scientific | 2025 |
| NM 99 Og 101 AS | Real estate | 2026 |
| NM Market AS | Wholesale & retail | 2018 |
| NM Teknokonsult AS | Professional & scientific | 2016 |
| NM Wines AS | Administrative & support | 2021 |
| NMG78 AS | Real estate | 2021 |
| NMS Automasjon AS | Professional & scientific | 2024 |
| NNC AS | Professional & scientific | 2008 |
| No Fish AS | Real estate | 2023 |
| No Invest AS | Real estate | 2021 |
| No. 26 Hairstyle AS | Other services | 2016 |
| Noahs Ark Trade Da | | 1993 |
| Nobis AS | Health & social care | 2020 |
| Nobodys Perfect AS | Administrative & support | 2021 |
| Nobra AS | Wholesale & retail | 2018 |
| Nobø Garasjelag SA | Transport & logistics | 1975 |
| Nocteva AS | Professional & scientific | 2025 |
| Noctis AS | Wholesale & retail | 2026 |
| Noem AS | Information & communication | 2025 |
| Noev Explore AS | Arts & recreation | 2026 |
| Noev Invest AS | | 2026 |
| Nofitech Holding AS | Agriculture & fishing | 2017 |
| Nog Infra AS | Construction | 2023 |
| Noi Studio AS | Professional & scientific | 2021 |
| Nolik AS | Other services | 2023 |
| Nomak AS | Wholesale & retail | 2024 |
| Nomamon AS | | 2025 |
| Nomeland Holding AS | | 2024 |
| Nomono AS | Wholesale & retail | 2019 |
| Nomus AS | Education | 2003 |
| Non Stop 360 AS | Professional & scientific | 2010 |
| Nonnegata 16 AS | Real estate | 2013 |
| Nonnegata 20B AS | Real estate | 2012 |
| Nonnegata 2B AS | Real estate | 2017 |
| Nonnegata 6 Eiendom AS | Real estate | 2020 |
| Nonnegata 8 AS | Real estate | 2005 |