| Mael & Co AS | | 2019 |
| Mak Consult AS | Professional & scientific | 2018 |
| Malloc AS | Information & communication | 2000 |
| Manak Holding AS | Construction | 2006 |
| Markedspartner Nord AS | Professional & scientific | 2011 |
| Markveien Boliger AS | Real estate | 2008 |
| Marnuten AS | | 2023 |
| Mavo AS | Real estate | 2006 |
| MBS Holding AS | | 2026 |
| Medhjelp AS | Information & communication | 2019 |
| Medtech AS | Wholesale & retail | 2023 |
| Mellymoon AS | Wholesale & retail | 2013 |
| Menerga A/S | Wholesale & retail | 1988 |
| Mersida Frisør AS | Other services | 2019 |
| Mikrosement Og Dekorpuss AS | Real estate | 2017 |
| Mind Too AS | Education | 2020 |
| Miso Holding AS | | 2026 |
| Mitt Dekkhotell Asker AS | Other services | 2018 |
| Moi Arkitekter AS | Professional & scientific | 2016 |
| Moimoi Holding AS | | 2025 |
| Mondå Forlag AS | Information & communication | 2014 |
| Mondå Holding AS | Real estate | 2015 |
| Mondå Kunnskap AS | Education | 2022 |
| MPL Solutions AS | Real estate | 2005 |
| MSN Invest AS | Financial services | 2017 |
| Murmester/Tømrermester Bagroen & Skram AS | Construction | 2025 |
| Myrlund Holding AS | Information & communication | 2016 |
| Naturabiomat AS | Wholesale & retail | 2013 |
| Nihathamani AS | | 2026 |
| Nikri Holding AS | | 2022 |
| Ninas Hjemmetjenester Nuf | Health & social care | 2008 |
| Noon AS | Professional & scientific | 2004 |
| Noorlando AS | | 2025 |
| Nor Investments AS | | 2024 |
| Norcompute AS | Information & communication | 2022 |
| Nordic Dirt AS | Arts & recreation | 2020 |
| Nordic Shine Car Spa AS | Other services | 2025 |
| Nordisk Bilpartner AS | Wholesale & retail | 2024 |
| Nordum Pedersen Ans | Manufacturing | 1996 |
| Norja Seafood AS | Wholesale & retail | 2025 |
| Norsk Atlas AS | Wholesale & retail | 1979 |
| NORTRONICbygg AS | Administrative & support | 1985 |
| NOT4SAIL AS | | 2020 |
| Noveta AS | Construction | 1992 |
| Nuret AS | Wholesale & retail | 2019 |
| Nye Vakåsvei 20 AS | Real estate | 2026 |
| Nye Vakåsvei 8 AS | Real estate | 2007 |
| Nytt Format AS | Construction | 2022 |
| Nytthus AS | Real estate | 2019 |
| Nær Eiendom AS | Construction | 2010 |
| On Mol Holding AS | Education | 2020 |
| One Little Code Monkey AS | Information & communication | 2020 |
| Optimist Invest AS | Real estate | 2017 |
| Optivinst AS | | 2021 |
| Opus Systemer AS | Information & communication | 1994 |
| Ordentlig Gym AS | Other services | 2015 |
| Oslo Industrial Logic AS | Information & communication | 2016 |
| Oslo Sanitetsforening Brusetkollen AS | Health & social care | 2008 |
| Oltedal A/S | Real estate | 1927 |
| Padoin Visuell Expo AS | Professional & scientific | 1998 |
| Paraply Ventures AS | Information & communication | 2023 |
| PB Invest 45 AS | Real estate | 2015 |
| Peder Claussønsgt. 2 Oslo Ans | Real estate | 2003 |
| People & Project Management AS | Information & communication | 2021 |
| Perky AS | Information & communication | 2025 |
| Petersmp AS | Education | 2020 |
| Phoebe Wright Holding AS | | 2022 |
| Pilldog AS | Wholesale & retail | 2023 |
| Pine View Software AS | Wholesale & retail | 2014 |
| Pinerock Norway AS | | 2025 |
| Pinpoint Logistics AS | Transport & logistics | 2024 |
| PJ Consult AS | Professional & scientific | 1986 |
| Plim AS | Professional & scientific | 2011 |
| Preg Bolig AS | Construction | 2016 |
| Preg Eiendom Invest AS | Real estate | 2026 |
| Profil Design Norge AS | Wholesale & retail | 1993 |
| Profilmegleren AS | Wholesale & retail | 1999 |
| Promondo AS | Professional & scientific | 2016 |
| Psyke & Soma AS | Health & social care | 2024 |
| Qvipsdalen Efterretninger AS | Financial services | 2005 |
| R2 Eiendom AS | Real estate | 2021 |
| R31 Eiendom AS | Real estate | 2012 |
| Raak-Renhold Team AS | Construction | 2024 |
| Rav Tech AS | Construction | 2017 |
| Raven Media AS | Professional & scientific | 2020 |
| Ravnsborg Veksthus AS | Real estate | 2020 |
| Ravnsborgveien 52 AS | Real estate | 2026 |
| Red Ant Productions AS | Information & communication | 2011 |
| Reddeliv AS | Real estate | 2006 |
| REGNSKAPSPARTNER1 AS | Professional & scientific | 2024 |
| Reidunn Mygland AS | Professional & scientific | 2024 |
| Rene Vinduer AS | Administrative & support | 2012 |
| Respire AS | Professional & scientific | 2024 |
| Restaurant Tjenester Ness AS | Hospitality | 2013 |
| Restauranthuset Ness AS | Hospitality | 2003 |
| Reuse AS | Information & communication | 2023 |
| Rodin Lie Invest AS | Financial services | 2005 |
| Roevin Management Services Ltd | | 1997 |
| Romar AS | Arts & recreation | 2024 |
| Rosma AS | Real estate | 2007 |