| Merkur Grafisk AS | Manufacturing | 2021 |
| Merkur Gruppen AS | Manufacturing | 1987 |
| Mibe Ans | Wholesale & retail | 2002 |
| Mimir Forlag AS | Information & communication | 2024 |
| Mir&Pak AS | Manufacturing | 2018 |
| Mission Wine & Spirit AS | Wholesale & retail | 1993 |
| Mitts Holding AS | | 2023 |
| Moberg Utvikling AS | Real estate | 2021 |
| Moderne Bad Og Flis AS | Construction | 2013 |
| Mograph AS | Professional & scientific | 2012 |
| Moi Trading AS | Professional & scientific | 2005 |
| Montørtech Lås Og Beslag AS | Professional & scientific | 2019 |
| Motho Consult AS | Information & communication | 2016 |
| Mountainbay AS | Professional & scientific | 2018 |
| Moveme AS | Information & communication | 2024 |
| Movement AS | Wholesale & retail | 2002 |
| MT4 Eiendom AS | | 2022 |
| MT4 Holding AS | | 2019 |
| Muamana AS | | 2021 |
| Multi Emballasje Norge AS | Wholesale & retail | 2008 |
| Multiteam Oppussing AS | Construction | 2018 |
| Munir Holding AS | | 2021 |
| Muovitech Norge AS | Wholesale & retail | 2016 |
| MVC Videra Norge AS | Wholesale & retail | 2011 |
| Nansen Trafikkskole AS | Education | 2019 |
| Naosi AS | | 2023 |
| Natura Hud AS | Wholesale & retail | 2024 |
| Nawid Transport AS | Transport & logistics | 2021 |
| NBS Accounting AS | Professional & scientific | 2022 |
| NBS GC1 AS | Transport & logistics | 2026 |
| Nettressurs AS | Wholesale & retail | 2006 |
| Nf-Drift AS | Construction | 2019 |
| Nils Hansen Sølvvarefabrikk AS | Manufacturing | 1926 |
| Nissefesten AS | Arts & recreation | 2025 |
| Noctra AS | Information & communication | 2026 |
| Noos Holding AS | Wholesale & retail | 2015 |
| Nordic Search Partner AS | Administrative & support | 2017 |
| Nordstrand Mur & Flis AS | Construction | 2012 |
| Noreng AS | Financial services | 2010 |
| Norgeseliten AS | Administrative & support | 1997 |
| Norsk Innkjøp AS | Wholesale & retail | 2013 |
| Norsk Lastbærer Pool AS | Administrative & support | 2006 |
| Norveg AS | Transport & logistics | 2023 |
| Nova Con AS | Construction | 2014 |
| Nye Ferske Fristelser AS | Hospitality | 2026 |
| Nyhagen Trafikkskole AS | Education | 2024 |
| Oabk Holding AS | | 2025 |
| Odd Erik Zapffe AS | Financial services | 2016 |
| Odd Langdalen AS | Wholesale & retail | 1990 |
| Odd Langdalen Frukt & Grønt En Gros AS | Wholesale & retail | 1990 |
| Oge Solutions AS | Professional & scientific | 2015 |
| Oilrox AS | Professional & scientific | 2014 |
| Olastuen Holding AS | Real estate | 2008 |
| Online Katalogservice AS | Financial services | 2005 |
| Oppegård Ingeniørkontor AS | Professional & scientific | 2017 |
| Optimal Fysio AS | Health & social care | 2022 |
| Optimized AS | Professional & scientific | 2021 |
| Optinett AS | Professional & scientific | 1999 |
| Orourke Holding AS | | 2021 |
| Oslo Kranservice AS | Administrative & support | 2021 |
| Oslo Pumpeservice AS | Manufacturing | 2016 |
| Oslofjord Entreprenør AS | Construction | 2026 |
| Outland AS | Wholesale & retail | 1999 |
| Overskeid Holding AS | | 2020 |
| Oygarden Invest AS | | 2025 |
| Pal Holding AS | | 2016 |
| Panbanan SA | Wholesale & retail | 1990 |
| Panthium AS | Information & communication | 2006 |
| Panthium Software AS | Information & communication | 2013 |
| Pascaline AS | | 2019 |
| Pascaline Consulting AS | Professional & scientific | 2025 |
| Pekk AS | Arts & recreation | 2024 |
| Pham Holding AS | Hospitality | 2022 |
| Pillarstone Holding AS | | 2026 |
| Planetguardaerospace AS | Professional & scientific | 2023 |
| Posekompaniet AS | Wholesale & retail | 2009 |
| Pro Bolig AS | Real estate | 2015 |
| Pro Bolig Entreprenør AS | Construction | 2021 |
| Pro Bolig Invest AS | Real estate | 2020 |
| Profilium AS | | 2025 |
| Protonox AS | Professional & scientific | 2023 |
| PSN AS | | 2005 |
| Puls Bøleråsen AS | Arts & recreation | 2017 |
| Puls Greverud AS | Arts & recreation | 2019 |
| Puls Helse AS | Arts & recreation | 2022 |
| Puls Langhus AS | Arts & recreation | 2002 |
| Puls Marikollen AS | Arts & recreation | 2022 |
| Puls Samfunn AS | Health & social care | 2011 |
| Pulsgruppen AS | Wholesale & retail | 2013 |
| Qitit AS | Professional & scientific | 2013 |
| Rabe Taxi AS | Transport & logistics | 2019 |
| Ramberg Container Transport AS | Transport & logistics | 2016 |
| Ramnæs Consulting AS | Information & communication | 2018 |
| Ramstad Holding Invest AS | Construction | 2023 |
| Ramstad Rørleggerservice AS | Construction | 2023 |
| Raste Invest & IT AS | | 2023 |
| Recreate AS | Real estate | 2006 |
| Regnbuen Syd AS | Real estate | 2006 |
| Regnbueveien 10 AS | Wholesale & retail | 2013 |
| Reichel Frisør AS | Other services | 2024 |