| Narsil AS | Wholesale & retail | 2014 |
| Narverud Skog AS | Transport & logistics | 2019 |
| Nbits AS | Information & communication | 2026 |
| Nedre Urdalen Utvikling AS | Financial services | 2021 |
| Nemus Kongsberg AS | Health & social care | 2009 |
| Nestvang Wessel Holding AS | | 2026 |
| Nesvoll Organisasjonsutvikling AS | Professional & scientific | 2022 |
| Nettskog AS | Professional & scientific | 2011 |
| Neumann Eiendom AS | Real estate | 2001 |
| Nextech Service AS | Professional & scientific | 2021 |
| NG3 Eiendom AS | Real estate | 2025 |
| Nirigar AS | Real estate | 2005 |
| Nitro Eiendom AS | Real estate | 2022 |
| NM Låsesmed AS | Other services | 2023 |
| Nomad Coaching AS | Education | 2023 |
| Noni Network Norway AS | Wholesale & retail | 2005 |
| Nor Kvalitet & Kompetanse AS | Professional & scientific | 2007 |
| Nor Kvalitet & Kompetanse Holding AS | Professional & scientific | 2007 |
| Nora Bråthen AS | Real estate | 2019 |
| Nord Snekker AS | Construction | 2022 |
| Nordal-Eiendom AS | Real estate | 2018 |
| Nordic Batteries AS | Professional & scientific | 2014 |
| Nordic Telecom Group AS | Information & communication | 1997 |
| Nordisk Pukk Og Sand AS | Mining & quarrying | 2018 |
| Norpol Holding AS | Wholesale & retail | 2005 |
| Norsk Betongrehabilitering AS | Construction | 2025 |
| Norsk Forsvarsteknologi AS | Manufacturing | 1995 |
| Norspa Service AS | Construction | 1997 |
| North Safe AS | Administrative & support | 2017 |
| Norwegian Defense Systems AS | Professional & scientific | 2026 |
| Notodden Handelseiendom AS | Real estate | 2012 |
| Notodden Investering AS | | 2024 |
| Nufseriet Blomster AS | Wholesale & retail | 2005 |
| Numedalsveien 76 AS | Real estate | 2016 |
| Nuvi AS | Professional & scientific | 2019 |
| Nuvi Montasje AS | Construction | 2023 |
| Nybrua Eiendom AS | Real estate | 2007 |
| Nybruveien 3 AS | Real estate | 2010 |
| Nye Bad Kongsberg AS | Construction | 2015 |
| Nye Bilomsetning Kongsberg Da | Wholesale & retail | 2001 |
| Nye Broadway Pub Ans | Hospitality | 1994 |
| Nyksund AS | Professional & scientific | 2006 |
| Nymoen Legekontor AS | Health & social care | 1990 |
| Nymoens Torg 11 AS | Real estate | 1995 |
| Nysny AS | Information & communication | 2021 |
| O'Sullivan Subsea Consulting AS | Professional & scientific | 2016 |
| O.M Holding AS | Real estate | 2015 |
| Obass Capital AS | | 2025 |
| Ofr AS | Manufacturing | 2024 |
| Ohb Holding AS | Real estate | 2025 |
| Ojg Support AS | Professional & scientific | 2017 |
| Olafsen Elektro AS | Construction | 2025 |
| Olav Berget AS | Real estate | 2012 |
| Olavsgate 26 AS | Real estate | 1996 |
| Ole's Bil- Og Mcskole AS | Real estate | 2011 |
| Om Eiendom AS | Real estate | 2015 |
| Omnia Holding AS | Real estate | 2023 |
| Oppspill AS | Information & communication | 2024 |
| Opsahlgarden AS | Hospitality | 2012 |
| Optileks AS | Wholesale & retail | 1976 |
| Optisk Drift AS | Health & social care | 2000 |
| Organiz AS | Information & communication | 2025 |
| Original Teknologi AS | Professional & scientific | 2016 |
| Orlistullen AS | Construction | 2022 |
| Ormerfjorden Vann Og Avløp SA | Water & waste | 2012 |
| Ortoteket AS | Manufacturing | 2017 |
| Ove Gjeddes Vei AS | Real estate | 2014 |
| P & T Transport Paul Haugen Og Tom Haugen AS | Transport & logistics | 1993 |
| P E B Holding AS | | 2023 |
| P Reinemo AS | Financial services | 2017 |
| Partsmeister AS | Wholesale & retail | 2026 |
| Pawel Lupke | Construction | 2007 |
| Pea Eiendom AS | Real estate | 2026 |
| Pea Partners AS | | 2025 |
| Pent Og Fin AS | Wholesale & retail | 2024 |
| Per Lunde AS | Hospitality | 1999 |
| Per Lunde Finans AS | Hospitality | 2005 |
| Per Mikkelsen AS | Real estate | 2006 |
| Perhar AS | Professional & scientific | 2023 |
| Perle Eiendom AS | Real estate | 2005 |
| Perpetua AS | Professional & scientific | 2022 |
| Petit Salong AS | Other services | 2005 |
| Petronella & Co AS | Wholesale & retail | 2019 |
| Petta Holding AS | Financial services | 2005 |
| Petter Bråthen AS | | 2019 |
| Petter Spiten AS | | 2005 |
| Pilot Engineering AS | Professional & scientific | 1997 |
| Pinkys Kjøkken AS | Hospitality | 2025 |
| Pinto Thai Express AS | Hospitality | 2024 |
| Pixida AS | Information & communication | 2010 |
| PK Eiendom AS | Real estate | 1993 |
| PK Gruppen AS | Real estate | 1984 |
| PK Hus AS | Construction | 1994 |
| PK Hus Prosjekt AS | Real estate | 2006 |
| PK Regnskap AS | Professional & scientific | 2007 |
| Placebo AS | Real estate | 1998 |
| Placerville AS | Real estate | 2016 |
| Plan C AS | Information & communication | 2017 |
| Plan Og Ressurs AS | Professional & scientific | 2008 |
| Planlegg.No AS | | 2014 |