| Nesttunkollen AS | Real estate | 2013 |
| Nesøy AS | Manufacturing | 2017 |
| Neumann Invest AS | Financial services | 1999 |
| Newco Holding AS | Real estate | 2008 |
| Nexus Marketing Nuf | Professional & scientific | 2007 |
| NF Operational AS | Education | 2022 |
| NH Kapital AS | Financial services | 2004 |
| Nibro Invest AS | Real estate | 2005 |
| Nibu Studio AS | Professional & scientific | 2023 |
| Ninensoma Consulting AS | Professional & scientific | 2019 |
| NK Funds AS | Professional & scientific | 2007 |
| Nni Resources AS | Professional & scientific | 2013 |
| No 11 Invest AS | | 2021 |
| No Surrender AS | Financial services | 2018 |
| Nomadic International AS | Transport & logistics | 1989 |
| Nomadic Shipping AS | Transport & logistics | 2007 |
| Nor-Sub AS | Real estate | 2013 |
| Nordanger Holding AS | | 2021 |
| Nordbye AS | Information & communication | 2012 |
| Nordic Matrix AS | Professional & scientific | 2017 |
| Norinvestor AS | Professional & scientific | 1998 |
| Normeat Holding AS | | 2020 |
| Noroil AS | Professional & scientific | 2019 |
| Norsk Makedonsk Lutlag AS | | 1998 |
| North Sea Productions AS | Information & communication | 2012 |
| Northern Soul Adventures Ans | Administrative & support | 2016 |
| Northland Capital AS | | 2023 |
| Nortid Consulting AS | Real estate | 2005 |
| Nortid Eiendom AS | | 1991 |
| Nortid Utbygging AS | Real estate | 2005 |
| Nortrans Accommodation AS | Administrative & support | 2023 |
| Norwegian International Trust Services Ans | Administrative & support | 2004 |
| Novaro AS | Real estate | 2025 |
| NSN AS | Information & communication | 2013 |
| Numbercom AS | Information & communication | 2013 |
| Nurban Apeltun AS | Real estate | 2023 |
| Nurban Eiendomsutvikling AS | Real estate | 2022 |
| Nurban Foldnes AS | Real estate | 2023 |
| Nyborg Holding AS | Real estate | 2005 |
| Nydal Holding AS | Real estate | 1983 |
| Nye Bygg AS | Real estate | 2023 |
| Nye Damsgaard Brygge AS | Real estate | 2013 |
| Nøstegaten Eiendom AS | Real estate | 2004 |
| Nøstekaien Holding AS | | 2019 |
| Nøysomheten Invest AS | | 2025 |
| NÚX Nordic Holding AS | Other services | 2025 |
| NÚX Wellness Club AS | Other services | 2025 |
| Ocean Tales AS | Professional & scientific | 2025 |
| Ocean Tales Holding AS | | 2026 |
| Oceanpact Technology Norway AS | Professional & scientific | 1999 |
| Oct Holding AS | | 2007 |
| Oda Logistikk AS | Transport & logistics | 2023 |
| Odin Eiendomsforvaltning AS | Real estate | 2018 |
| Odin Henrikssen & Sønn AS | Wholesale & retail | 1999 |
| Oil Extreme Europe AS | Professional & scientific | 1986 |
| Olicha AS | Professional & scientific | 2006 |
| Oliv Holding AS | | 2020 |
| Oliv Invest AS | Administrative & support | 2020 |
| Om Leela Yoga Da | Education | 2023 |
| Opheim Ventures AS | | 2025 |
| Oppussingshjelperne AS | Professional & scientific | 2026 |
| Optimal Trafikkskole AS | Education | 2021 |
| Optio Norway AS | | 2025 |
| Oriental Importer & Wholesaler AS | Wholesale & retail | 2010 |
| Oro Tankers AS | Transport & logistics | 2021 |
| Orrestad AS | Construction | 2021 |
| Oscarsverk AS | | 2021 |
| Otar Holding AS | | 2023 |
| P&J Chartering AS | Real estate | 2014 |
| Paal Kahrs Eiendom AS | Real estate | 1864 |
| Packt AS | Health & social care | 1997 |
| Paddington AS | Transport & logistics | 2005 |
| Paradis Boligutvikling S7 AS | Real estate | 2018 |
| Paradis Fotklinikk AS | Health & social care | 2016 |
| Paradis Fysioterapi Og Manuellterapi Da | Health & social care | 2019 |
| Paradis Helse AS | Real estate | 2017 |
| Paradis Holding AS | Wholesale & retail | 2005 |
| Paradis Næringseiendom S7 AS | Real estate | 2018 |
| Paradis Properties AS | | 2016 |
| Paradis Sushi AS | Hospitality | 2004 |
| Paradisalleen 8 AS | Real estate | 2005 |
| Paradishøyden AS | Real estate | 2017 |
| Paraplox AS | Wholesale & retail | 2026 |
| Parat Energy AS | Professional & scientific | 2021 |
| Parelius AS | Professional & scientific | 2005 |
| Partners Group Swan Holding AS | Transport & logistics | 2019 |
| PBK Holding AS | Real estate | 2020 |
| Pedek AS | Real estate | 1968 |
| Pelagos AS | Real estate | 2004 |
| Penviro AS | | 2020 |
| Perestroika Invest AS | | 2013 |
| Petromarin Holding AS | Mining & quarrying | 1996 |
| Petrowell AS | Professional & scientific | 2005 |
| Pexmar AS | Real estate | 2012 |
| Pexres AS | Professional & scientific | 1998 |
| Pfi AS | Real estate | 2007 |
| PGR Invest AS | Financial services | 2006 |
| Phi-Investment AS | Wholesale & retail | 2005 |
| Pimlico Holding AS | Real estate | 2018 |
| Pixofy AS | Professional & scientific | 2020 |