| NBD052025 AS | Hospitality | 2025 |
| Neelam Beauty AS | Wholesale & retail | 2022 |
| Neksus Global AS | Transport & logistics | 2014 |
| Nemus Jessheim AS | Health & social care | 2011 |
| Nemus Ålgård Invest AS | Health & social care | 2026 |
| Nenger Musikk AS | Education | 2020 |
| Neo Vista Da | Information & communication | 2025 |
| Nesfjellet 1030 AS | Real estate | 2026 |
| Neslow AS | | 2026 |
| Nesna Kafe Og Grillkjøkken AS | Hospitality | 2020 |
| Nessi Holding AS | Health & social care | 2005 |
| Nessiøy AS | Real estate | 1993 |
| New Nails Jessheim AS | Other services | 2026 |
| Newfuture AS | | 2023 |
| Nexer Asset Management AS | Information & communication | 2013 |
| Next Hole Fotball AS | Professional & scientific | 2021 |
| NG Capital AS | | 2025 |
| NH Bemanning AS | Administrative & support | 2017 |
| NH Bygg AS | Construction | 2020 |
| Nicestop AS | Information & communication | 2015 |
| Nicholls Capital AS | | 2026 |
| Nicolaisen Invest AS | Wholesale & retail | 2005 |
| Nka AS | | 2013 |
| No Holding AS | | 2020 |
| Noberg Entreprenør AS | Real estate | 2025 |
| Noberg Holding AS | | 2025 |
| Noellski AS | Hospitality | 2022 |
| Noirmai AS | Professional & scientific | 2026 |
| Nokke AS | Transport & logistics | 2016 |
| Nomaco Norge AS | Wholesale & retail | 2019 |
| Nooma Holding AS | Professional & scientific | 2019 |
| Noot Reklame AS | Wholesale & retail | 2010 |
| Nor Bilpleie AS | Other services | 1995 |
| Norbeck Eiendom AS | Real estate | 2017 |
| Norbeck Invest AS | Real estate | 2015 |
| Norbil Gruppen AS | Wholesale & retail | 2022 |
| Nordby Hage AS | Real estate | 2019 |
| Nordic Boligutvikling AS | Real estate | 2018 |
| Nordic Glass Service AS | Construction | 2023 |
| Nordic Lifestyle AS | Health & social care | 2014 |
| Nordic Saas AS | Information & communication | 2016 |
| Nordisk Trefelling AS | Agriculture & fishing | 2026 |
| Nordiske Eiendommer AS | Real estate | 2009 |
| Nordkisa Utvikling AS | Real estate | 2016 |
| Nordlys Lotfee AS | Hospitality | 2026 |
| Norelia Graveservice AS | Construction | 2024 |
| Normand Technologies AS | Information & communication | 2020 |
| Norsa AI Technologies AS | Information & communication | 2025 |
| Norsk Brannkonsept AS | Professional & scientific | 2022 |
| Norsk Byggsakkyndig AS | Real estate | 2014 |
| Norsk Maler Proffen AS | Construction | 2021 |
| Norske Gulv AS | Wholesale & retail | 2015 |
| Norske Vaskerier SA | Other services | 2010 |
| Norsolve AS | Professional & scientific | 2021 |
| Norwegian Detectiondogs AS | Administrative & support | 2019 |
| NR1 Entreprenør AS | Construction | 2020 |
| NT Prosjekt AS | Real estate | 2020 |
| Nydal Park AS | Real estate | 2019 |
| Nye Soelberg Transport AS | Transport & logistics | 2026 |
| Nye Øverbye Eiendom AS | Real estate | 2022 |
| Nye Øyesenteret Jessheim AS | Wholesale & retail | 2023 |
| Næss Eiendomsselskap AS | Real estate | 2008 |
| Næss Installasjon AS | Construction | 1991 |
| Nørvegjerdet Invest AS | | 2022 |
| O.F Transport Limited Nuf | Wholesale & retail | 2009 |
| O2S Holding AS | Real estate | 2018 |
| Oasen Jessheim AS | Wholesale & retail | 2011 |
| Obra Transport AS | Transport & logistics | 2022 |
| Obsfrø Invest AS | Financial services | 2018 |
| Octapharma AS | Wholesale & retail | 1988 |
| Odd Sund AS | | 2007 |
| Oddvar Solheim AS | Construction | 2004 |
| Odelsparken Holding AS | Construction | 2012 |
| Ofbit AS | Information & communication | 2024 |
| Ofstaas AS | | 2024 |
| Oh Pretty Norge AS | Health & social care | 2026 |
| Ohmify AS | Information & communication | 2018 |
| Ojg Holding AS | Financial services | 2017 |
| Ojv AS | Real estate | 2022 |
| Ok Hardt Metall AS | Wholesale & retail | 2016 |
| Oko Consulting AS | Professional & scientific | 2025 |
| Olaløkka Grendehus Al Ba | Real estate | 1989 |
| Ole Olsrud AS | Wholesale & retail | 2019 |
| Ole Olsrud Eiendom AS | Real estate | 2023 |
| Ole Olsrud Holding AS | Real estate | 2018 |
| Oliver Eiendom AS | Real estate | 1993 |
| Olrytro Invest AS | | 2019 |
| Olsen Auto Jessheim AS | Other services | 2013 |
| Olsen Sjåførutleie Nor Nuf | Transport & logistics | 2021 |
| Oord Eiendom AS | Real estate | 1994 |
| Oord Holding AS | Real estate | 1989 |
| Opsahl Dame Og Herrefrisør AS | Other services | 2016 |
| Optireach AS | Professional & scientific | 2023 |
| Optix Eiendom AS | Real estate | 2022 |
| Optix Holding AS | | 2026 |
| Optix Infrastruktur AS | Professional & scientific | 2026 |
| Optix Installasjon AS | Information & communication | 2017 |
| Or-Takst AS | Professional & scientific | 2023 |
| Orange Investment AS | | 2024 |
| Orbitarena Arbeidsinkludering AS | Health & social care | 2021 |