| Lupu Autotrans AS | Transport & logistics | 2025 |
| Låsekspressen AS | Manufacturing | 2013 |
| Maler Mann AS | Construction | 2018 |
| Malera Entreprenør AS | Construction | 2024 |
| Malerfirmaet Eriksen & Eriksen AS | Construction | 2008 |
| Malerland AS | Construction | 2024 |
| Maravelakis Holding AS | Administrative & support | 2024 |
| Marnic Holding AS | Real estate | 2020 |
| Mattsson Aviation AS | Transport & logistics | 2026 |
| Mceb Holding AS | | 2024 |
| Medi Consult AS | Education | 2021 |
| Mediane Holding AS | Financial services | 2011 |
| Mel Gardermoen 4 AS | Real estate | 2021 |
| Mel Moreppen 21 AS | Real estate | 2024 |
| Mel Moreppen 26 AS | Real estate | 2024 |
| Melheim AS | Wholesale & retail | 2008 |
| Melu Holding AS | | 2024 |
| Meretes Quilteloft AS | Wholesale & retail | 2017 |
| MG Business AS | | 2023 |
| Min Kollega AS | Administrative & support | 2025 |
| Mincon Norway AS | Wholesale & retail | 2025 |
| Mjohannessen Holding AS | Construction | 2017 |
| MMG Consulting AS | Education | 2026 |
| Mnils Holding AS | Real estate | 2020 |
| Mo Gård Eiendom Da | Real estate | 2021 |
| Moene Kjøleteknikk AS | Construction | 2004 |
| Mom AS | Professional & scientific | 2022 |
| Moonage Daydream AS | Professional & scientific | 2020 |
| Movement Dansestudio AS | Education | 2021 |
| MR Pauls Shipping & Logistics AS | Transport & logistics | 2012 |
| MTB Consult AS | Professional & scientific | 2019 |
| Multidata Consulting AS | Information & communication | 2026 |
| Multifiber AS | Information & communication | 2013 |
| Murer Hansen AS | Construction | 2005 |
| Mymo AS | Information & communication | 2025 |
| Naboen Utleie Oslo AS | Administrative & support | 1996 |
| Nabolagene AS | Real estate | 2026 |
| NBD Concept AS | Transport & logistics | 2016 |
| NC Norcraft AS | Administrative & support | 2017 |
| NCT AS | Wholesale & retail | 2021 |
| Newco AS | Information & communication | 2026 |
| Nexvuo AS | Information & communication | 2026 |
| Nexvuo Invest AS | Information & communication | 2026 |
| Niedzielski Holding AS | Professional & scientific | 2020 |
| Niklas Bygg AS | Construction | 2018 |
| Nittedal Rørleggerbedrift AS | Construction | 2016 |
| Nivåbygg AS | Construction | 2017 |
| NMD AS | | 2026 |
| Nomey AS | Transport & logistics | 2020 |
| Nordic Auto Adventure AS | Administrative & support | 2024 |
| Nordisk Bad AS | Construction | 2022 |
| Norgesstigen AS | Wholesale & retail | 2022 |
| Norkura AS | Health & social care | 2026 |
| Norskbuss AS | Wholesale & retail | 2016 |
| Norske-Bygg AS | Real estate | 2016 |
| North Eiendom AS | Real estate | 2010 |
| Norven AS | Transport & logistics | 2023 |
| Norwegian Agro Machinery AS | Wholesale & retail | 2016 |
| Norwegian Autowerks AS | Wholesale & retail | 2023 |
| NRB AS | Construction | 2024 |
| Numeri Invest AS | Financial services | 2012 |
| Nygata 48 AS | Real estate | 2021 |
| NZ Rørservice AS | Construction | 2019 |
| O.A.Nysæther AS | Real estate | 2013 |
| Oa Betong AS | Manufacturing | 2012 |
| Objectfront AS | Information & communication | 2013 |
| Ok Romsaas Holding AS | Real estate | 2006 |
| Olithenoa AS | | 2024 |
| Opp & Ned AS | Professional & scientific | 2015 |
| Oppegård Invest AS | Real estate | 2021 |
| Oslo Snekkerverksted AS | Construction | 2015 |
| Oslo Storbilvask AS | Other services | 2016 |
| Oslo Varmeservice AS | Wholesale & retail | 2001 |
| Osloveien 10 AS | Real estate | 2005 |
| Osloviken Entreprenør AS | Construction | 2024 |
| Otd Akademiet AS | Education | 2014 |
| Ove's Sportsfiske AS | Wholesale & retail | 1995 |
| P.A. Eiendomsservice AS | Administrative & support | 2017 |
| Palp Group AS | Wholesale & retail | 2024 |
| Panda Holding AS | | 2024 |
| Pent Og Brukt AS | Wholesale & retail | 2021 |
| Perfekt Elektro AS | Construction | 2026 |
| Perspektiv Eiendom AS | Real estate | 2016 |
| Perto Holding AS | | 2018 |
| PKL Capital AS | | 2026 |
| Plukk & Pakk AS | Administrative & support | 2021 |
| Polly P Invest AS | Administrative & support | 2018 |
| Polskie Linie Lotnicze Lot Nuf | Transport & logistics | 2018 |
| Pondera AS | | 2025 |
| Power Eiendom AS | Real estate | 2000 |
| Power System AS | Wholesale & retail | 1985 |
| Powergroup Holding AS | | 2020 |
| PRD Norway AS | Transport & logistics | 2020 |
| Preljevic AS | Health & social care | 2017 |
| Pro Eiendom Ans | Real estate | 2000 |
| Probatix Eiendom AS | Real estate | 2005 |
| Probatix Holding AS | Real estate | 2005 |
| Proff Rørlegger AS | Construction | 2012 |
| PSB In-Vest AS | Wholesale & retail | 2016 |
| Quaerite AS | Information & communication | 2026 |