| Loge- AS | Construction | 2019 |
| Louise Eiendom Holding AS | Real estate | 2019 |
| Lulali AS | Wholesale & retail | 2025 |
| Lulu Invest AS | | 2021 |
| Lynxx AS | Information & communication | 2024 |
| Lasse Oppegaard Transport AS | Transport & logistics | 1986 |
| Løven Holding AS | Real estate | 2012 |
| Maci AS | Wholesale & retail | 2005 |
| Madost AS | Professional & scientific | 2014 |
| Magnus Vartdal Holding AS | Financial services | 2016 |
| Maksi Invest AS | Wholesale & retail | 2012 |
| Male AS | Hospitality | 1999 |
| Malefryd AS | Construction | 2005 |
| Malermester Eckholm AS | Construction | 2000 |
| Malkia AS | Wholesale & retail | 2023 |
| Markitekt AS | Professional & scientific | 2014 |
| Martea Holding AS | Wholesale & retail | 2007 |
| Masteveien 6 AS | Real estate | 2007 |
| Mattiåtotti AS | | 2020 |
| Megadent AS | Health & social care | 2026 |
| Mek-Tech Service Ans | Wholesale & retail | 2004 |
| Mel Heia 13 AS | Real estate | 2022 |
| Mel Heia 16 AS | Real estate | 2022 |
| Mel Heia 25 AS | Real estate | 2022 |
| Mel Heia 26 AS | Real estate | 2022 |
| Mel Heia 28 AS | Real estate | 2022 |
| Mel Heia 30 AS | Real estate | 2022 |
| Mel Heia 31 AS | Real estate | 2022 |
| Mel Heia 32 AS | Real estate | 2022 |
| Mel Heia 36 AS | Real estate | 2022 |
| Mel Heia 38 AS | Real estate | 2022 |
| Mel Heia 4 AS | Real estate | 2022 |
| Melskog AS | | 2022 |
| Membran-Teknikk AS | Construction | 2023 |
| Merano Norges National Cirkus AS | Arts & recreation | 1974 |
| Mester Lie Invest AS | | 2019 |
| Metiso AS | Information & communication | 2020 |
| Mikkelborg Invest AS | | 1999 |
| Mil Holding AS | Financial services | 2017 |
| Min Uteplass AS | Wholesale & retail | 2016 |
| Minsås Invest AS | Real estate | 2016 |
| Mishka Eiendom AS | | 2005 |
| Misk AS | | 2025 |
| Mixhus AS | Transport & logistics | 2024 |
| MJ Anlegg AS | Construction | 2026 |
| Moba Bygg Og Renhold AS | Real estate | 2017 |
| Modelsport AS | Wholesale & retail | 2010 |
| Moment Int AS | Construction | 2024 |
| Morten Woxen AS | Real estate | 2014 |
| Morterud & Ramse AS | Construction | 1992 |
| Moviex AS | Information & communication | 2022 |
| Mur D-A AS | Construction | 2019 |
| Mur Og Bad AS | Construction | 2009 |
| Mykleborg Holding AS | Real estate | 2021 |
| Møaj AS | | 2022 |
| Nandi Coffee AS | Manufacturing | 2024 |
| Nennsomt AS | Professional & scientific | 2018 |
| Nerdrumshagen Barnehage AS | Education | 2007 |
| Nero Security AS | Construction | 2008 |
| Nina Holding Nils AS | | 2025 |
| Nitho AS | Wholesale & retail | 2010 |
| Nitho Fetsund AS | Wholesale & retail | 1976 |
| Nitho Gruppen AS | Wholesale & retail | 2016 |
| Nitteberg Bil AS | Wholesale & retail | 2016 |
| Nobel Transport AS | Transport & logistics | 2015 |
| Nordic Automation AS | Professional & scientific | 2019 |
| Nordic Homes AS | Professional & scientific | 2015 |
| Nordic Sun AS | Wholesale & retail | 2024 |
| Nordlys Drive AS | Wholesale & retail | 2026 |
| Norgames AS | Information & communication | 2016 |
| Normog Drift AS | Other services | 2022 |
| Normog Eiendom AS | Real estate | 2022 |
| Normog Holding AS | Other services | 2022 |
| Norpal AS | Professional & scientific | 2010 |
| Norsk Helseportal AS | Information & communication | 2016 |
| Norsk Pumpeservice AS | Wholesale & retail | 1984 |
| Norskhenger AS | Wholesale & retail | 2019 |
| Norvic AS | Information & communication | 2023 |
| Norvic Holding AS | Information & communication | 2023 |
| Norwegian Kudu AS | | 2023 |
| Noxmc School AS | Education | 2023 |
| Nyblom Invest AS | Wholesale & retail | 2005 |
| Nye Hundihuset AS | Wholesale & retail | 2026 |
| Nøve AS | Real estate | 1987 |
| Okl Holding AS | | 2021 |
| Olai Solheim AS | Information & communication | 2021 |
| Omlb Invest AS | Financial services | 2018 |
| On Tools AS | Financial services | 2018 |
| Onedoc AS | Financial services | 2017 |
| Oppco Holding AS | | 2025 |
| Oppussing Gosz AS | Construction | 2020 |
| Optimal Performance Services AS | Administrative & support | 2025 |
| Oslo Ekspert AS | Transport & logistics | 2021 |
| Oslo Glass Og Rørleggerservice AS | Construction | 2026 |
| Oslo Montasje AS | Professional & scientific | 2013 |
| Oslo VB Bygg AS | Construction | 2022 |
| P-Man Holding AS | Professional & scientific | 2011 |
| Pak AS | Wholesale & retail | 2013 |
| Parkov Holding AS | Real estate | 2020 |
| Pece Invest AS | | 2021 |