| Lydig AS | Information & communication | 2023 |
| Løkens Matsenter AS | Real estate | 1980 |
| M&N Transport AS | Transport & logistics | 2025 |
| Made to Measure AS | Construction | 2023 |
| Malbygg Service AS | Construction | 2023 |
| Maler Service KNS AS | Construction | 2023 |
| Malerfirmaet Bjørn E Schøne AS | Construction | 1998 |
| Malermester Magnus Lund AS | Construction | 2025 |
| Malik Engros AS | Wholesale & retail | 2012 |
| Maliks Vik Bistro AS | Hospitality | 2013 |
| Mange Tall AS | Professional & scientific | 2026 |
| Mari Naturbarnehage SA | Education | 2003 |
| Maskin Importøren AS | Wholesale & retail | 1991 |
| Maskinentreprenør Svend Fjellstad AS | Construction | 1998 |
| Mat Import AS | Wholesale & retail | 2012 |
| Matpartner Invest AS | Wholesale & retail | 2024 |
| Mauken Invest AS | | 2024 |
| MB Solid Work AS | Construction | 2016 |
| Mbknutsen AS | | 2022 |
| Me & Mo Holding AS | Construction | 2012 |
| Mece Eiendom AS | Real estate | 2011 |
| Mece Invest AS | Real estate | 1996 |
| Megatrade Norge AS | Wholesale & retail | 2017 |
| Mesterbedriften Lund AS | Construction | 2021 |
| MG Byggservice AS | Construction | 2025 |
| Mitsubishi Electric Europe B.V. Nuf | Wholesale & retail | 2015 |
| Mjær Fus Barnehage AS | Education | 2007 |
| Mogam Eiendom AS | Real estate | 2020 |
| Mood Invest AS | Professional & scientific | 2017 |
| MR Coffee AS | Wholesale & retail | 2009 |
| Muspelheim AS | | 2019 |
| Mym AS | Information & communication | 2021 |
| N6 Invest AS | Real estate | 2011 |
| ND Betongtransport Nuf | Transport & logistics | 2021 |
| Neste Nivå AS | Education | 2021 |
| Nettools Ans | Wholesale & retail | 2005 |
| Nettools AS | Information & communication | 2006 |
| Nikolaysen Holding AS | Financial services | 2005 |
| Norbøl AS | Construction | 2021 |
| Nordhagen Eiendom 2 AS | Real estate | 2024 |
| Nordic Imports AS | Wholesale & retail | 2025 |
| Nordic Tek Panels AS | Wholesale & retail | 2024 |
| Nordkapp Kapital AS | Construction | 2023 |
| Norel Transport AS | Transport & logistics | 2018 |
| Norges Autosalg AS | Arts & recreation | 2012 |
| Norges Rørleggerbedrift AS | Construction | 2009 |
| Norgross AS | Wholesale & retail | 2025 |
| Norkran AS | Transport & logistics | 2023 |
| Normik Bygg AS | Construction | 2025 |
| Norrlandspall AS | Wholesale & retail | 2021 |
| Northhaven Management AS | Professional & scientific | 2026 |
| Norway Roads AS | Real estate | 2015 |
| Nylende Barnehage SA | Education | 1992 |
| Oa Klinikken AS | Health & social care | 2017 |
| Oase Outdoors AS | Wholesale & retail | 2019 |
| Olenka Delikatesser AS | Wholesale & retail | 2016 |
| Olenka Holding AS | Real estate | 2020 |
| Opticon AS | Construction | 2004 |
| Opticon Solutions AS | Construction | 2015 |
| Oslo Drift AS | Manufacturing | 2026 |
| Oslo Epoxybelegg AS | Construction | 2018 |
| Oslo Murerne AS | Construction | 2002 |
| Oslo Sats, Repro & Montasje AS | Manufacturing | 1988 |
| Oslo Utvikling AS | Construction | 2018 |
| Oslo Viserguttkontor AS | Transport & logistics | 2016 |
| Osloveien 624 AS | Real estate | 2020 |
| Osloveien Næringssenter AS | Professional & scientific | 2013 |
| Osloveien Prosjekt AS | Real estate | 2020 |
| Outsourcing Company | Administrative & support | 2024 |
| Pbkjoss Holding AS | | 2026 |
| Pdsvision AS | Information & communication | 2010 |
| Pea Force Holding AS | Professional & scientific | 2026 |
| Peder Sethern Invest AS | | 2023 |
| Pedtek AS | Education | 2023 |
| Pensel AS | | 2021 |
| Per Aarskog Eiendom AS | Real estate | 1993 |
| Per Erik Østlie Holding AS | | 1993 |
| Petn Holding AS | | 2026 |
| PKK Spesialisten AS | Professional & scientific | 2019 |
| Praco AS | Professional & scientific | 1994 |
| Pro Gruppen Norway AS | Professional & scientific | 2020 |
| Procom AS | Professional & scientific | 2012 |
| Proffpaint AS | Construction | 2017 |
| Project Norway AS | Construction | 1993 |
| Protruck AS | Wholesale & retail | 2018 |
| PTP AS | Professional & scientific | 2015 |
| Pål Nordhagen AS | Construction | 2013 |
| Pål Ramdahl Holding AS | Real estate | 2012 |
| Quickship Logistics AS | Transport & logistics | 2015 |
| Rask Utflytt AS | Transport & logistics | 2026 |
| RC- Hjemmehjelp AS | Health & social care | 2021 |
| Re Multigulv AS | Construction | 2008 |
| Reflexconsult AS | Professional & scientific | 2009 |
| Regnskap Og Rådgivning AS | Professional & scientific | 2008 |
| Resaland AS | Real estate | 2017 |
| Ringvoll Næringseiendom AS | Real estate | 1998 |
| Robust Saging Og Boring AS | Construction | 2025 |
| Romdoblern AS | | 2025 |
| Romskip AS | Information & communication | 2013 |
| Rørdoktor AS | Construction | 2011 |