| Montasje Eiendom Og Rekkverk AS | Construction | 2022 |
| Moss Hage Og Vedlikehold AS | Construction | 2025 |
| Mova Holding AS | Real estate | 2025 |
| Mpedersen Consulting AS | Information & communication | 2022 |
| Mpedersen Holding AS | Information & communication | 2020 |
| MPM Interiør AS | Wholesale & retail | 2020 |
| Multi Drift AS | Construction | 2020 |
| MV Anlegg AS | Wholesale & retail | 2016 |
| My Skin AS | Other services | 2019 |
| My&Mo Da | Arts & recreation | 2011 |
| Mysen Tennisakademi AS | Education | 2020 |
| Nara Utvikling 2 AS | Real estate | 2023 |
| Nativgo AS | Information & communication | 2020 |
| Nattsyn AS | Information & communication | 2024 |
| Naturlig Valg AS | Wholesale & retail | 2004 |
| Nerhagen Takst AS | Professional & scientific | 2023 |
| Nes HF | Transport & logistics | 1995 |
| Neste Trekk AS | Wholesale & retail | 2010 |
| Nevrokirurgitjenester AS | Health & social care | 2022 |
| No-Ma Holding AS | | 2022 |
| Noahs Hage AS | Wholesale & retail | 2007 |
| Nobel Biocare AB | Wholesale & retail | 2012 |
| Noninva Laserbehandling AS | Health & social care | 2018 |
| Nora Farah AS | Professional & scientific | 2003 |
| Norberg Invest AS | Real estate | 2015 |
| Nordby Kapital AS | | 2026 |
| Nordic Health Diagnostics AS | Health & social care | 2022 |
| Nordiska Industribyggen & Fasad, Nifab AS | Construction | 1997 |
| Nordskaug Invest AS | Real estate | 2007 |
| Nordspect AS | Information & communication | 2026 |
| Nordstep Shipping AS | Transport & logistics | 2026 |
| Noritt AS | Financial services | 2013 |
| Normar Services Ans | Wholesale & retail | 1994 |
| Norsk Innspillingsbyrå AS | Arts & recreation | 1998 |
| Norsk Omega 3 AS | Manufacturing | 2013 |
| Norsk Vending AS | Wholesale & retail | 2016 |
| Norteak Norge Da | Wholesale & retail | 2003 |
| Nortek AS Grafisk Service | Real estate | 1988 |
| Northbound Commercial AS | Professional & scientific | 2026 |
| Norvag Byggsystem AB V/Byrået I Son AS | Construction | 2005 |
| NP Invest AS | | 2021 |
| Npa Group Aps | Wholesale & retail | 1999 |
| Ny Kraft AS | Professional & scientific | 2003 |
| Nykan AS | Wholesale & retail | 2012 |
| Nøtteløkka AS | | 2024 |
| Oe Kanestrøm Consulting AS | Professional & scientific | 2017 |
| Oform AS | Professional & scientific | 2021 |
| Ogs Invest AS | Real estate | 2021 |
| Ohnstad Helse AS | Health & social care | 2022 |
| Ok Fremstad AS | | 2026 |
| Olh AS | Real estate | 2024 |
| Oliven Holding AS | Real estate | 2016 |
| Oncruiter AS | Administrative & support | 2020 |
| Oninvest AS | Information & communication | 2014 |
| Oplandske Bokforlag AS | Information & communication | 2013 |
| Opplæringssenteret AS | Education | 2014 |
| Oughten House Publications Europe AB V/Byrået I Son | | 1997 |
| Overgaard-Manpower | Administrative & support | 2011 |
| Oxovi AS | Information & communication | 2000 |
| P.E. Holding AS | Financial services | 2005 |
| Pakt AS | Professional & scientific | 2019 |
| Pandon AS | Professional & scientific | 2018 |
| Parsec Software AS | Information & communication | 2018 |
| Passiv AS | | 2024 |
| PB Techniek BV Nuf | Water & waste | 2009 |
| PEAK1 Advisors AS | Professional & scientific | 2019 |
| Peder Thrane Eiendom AS | Real estate | 2005 |
| Pedersen Bygg AS | Construction | 2000 |
| Penthouse Perfection Holding AS | Real estate | 2006 |
| People Nordic AS | Professional & scientific | 2019 |
| Per Wiik AS | Wholesale & retail | 1997 |
| Petter Bjerke Holding AS | | 2021 |
| Phobos AS | | 1996 |
| Pilatus AS | Transport & logistics | 2022 |
| Pipe Og Peis Spesialisten AS | Wholesale & retail | 2023 |
| Pipetown AS | Real estate | 2020 |
| Pitbox AS | Professional & scientific | 2020 |
| Pixab AS | Information & communication | 2015 |
| Polylana Ltd Nuf | Wholesale & retail | 2008 |
| Posteri AS | | 2026 |
| Praktisk Talt AS | Arts & recreation | 2018 |
| Privatkonsulenten AS | Professional & scientific | 2025 |
| Pro Consulting RT Teo Ans | Wholesale & retail | 1991 |
| Proactiva Holding AS | Health & social care | 2010 |
| Proam and Co AS | Health & social care | 2025 |
| Profisher AS | Manufacturing | 2017 |
| Propti AS | Information & communication | 2025 |
| Prosjektfabrikken AS | Real estate | 2015 |
| Proto Invest AS | Real estate | 2006 |
| Psykiater Haugerud AS | Health & social care | 2012 |
| Pure Azure AS | Wholesale & retail | 2025 |
| PVS AS | Professional & scientific | 2020 |
| Quantum Hero AS | Information & communication | 2022 |
| R-D-Holding AS | | 2023 |
| R. Larsen Eiendom AS | Real estate | 2005 |
| Rakstad Invest AS | | 2026 |
| Raskk Holding AS | Real estate | 2014 |
| Rationel Almen Planlægning Norsk Avdeling Av Utenlandsk Foretak Nuf | Information & communication | 1999 |
| Rcon AS | Information & communication | 2015 |
| Rebr AS | Information & communication | 2022 |