| LBH Invest AS | Real estate | 2017 |
| LBN Eiendom AS | Real estate | 2019 |
| Le Konsulent AS | Professional & scientific | 2018 |
| Lepus Consulting AS | Information & communication | 2025 |
| Lie-Nilsen Holding AS | Other services | 2019 |
| Liegaragen AS | Real estate | 2025 |
| Lier Bilmegling AS | Wholesale & retail | 2015 |
| Linc Holding AS | Manufacturing | 2023 |
| Lisas Varehandel Da | Hospitality | 2024 |
| Lisell Hudpleiesalong Da | Other services | 1989 |
| Litho AS | Real estate | 1981 |
| Logcon AS | Professional & scientific | 2013 |
| Lun Interiør AS | Wholesale & retail | 2025 |
| Lundhaug Eiendom AS | Real estate | 2018 |
| Lundhaug Invest AS | Real estate | 2001 |
| Lundteigen AS | Real estate | 2014 |
| Luxeomi Escapes AS | Administrative & support | 2025 |
| M. a. Eiendom AS | Real estate | 2003 |
| Maceva AS | | 2016 |
| Malema Holding AS | | 2021 |
| Malerteam AS | Construction | 2004 |
| Maling Og Vedlikehold Da | Construction | 2008 |
| Marlun AS | Construction | 2015 |
| Marma Lindahl AS | Wholesale & retail | 2024 |
| MCS Service AS | Manufacturing | 2024 |
| Medivatus AS | Wholesale & retail | 1970 |
| Miam AS | Financial services | 2018 |
| Miam Food AS | Professional & scientific | 2022 |
| Miami Pizza AS | Hospitality | 2008 |
| Mida Drift AS | Hospitality | 2020 |
| Midten AS | Real estate | 2023 |
| Mif Eiendomsdrift AS | Real estate | 2008 |
| Mili Skogservice AS | Agriculture & fishing | 2023 |
| Miras Invest AS | Real estate | 2013 |
| Mjøndalen Apotek AS | Wholesale & retail | 2021 |
| Mjøndalen Bilgummi AS | Wholesale & retail | 2022 |
| Mjøndalen Bygg- Og Flisesenter AS | Wholesale & retail | 1997 |
| Mjøndalen Eiendom AS | Financial services | 1991 |
| Mjøndalen Helseklinikk AS | Health & social care | 2025 |
| Mjøndalen Invest AS | Real estate | 2010 |
| Mjøndalen Kiropraktorklinikk AS | Health & social care | 2016 |
| Mjøndalen Kiropraktorsenter AS | Health & social care | 2025 |
| Mjøndalen Legesenter AS | Health & social care | 2026 |
| Mjøndalen Lyd Og Bilde Ans | Wholesale & retail | 1992 |
| Mjøndalen Mur Og Puss AS | Construction | 1995 |
| Mjøndalen Pizzadrift AS | Hospitality | 2011 |
| Mjøndalen Sport Og Kultursenter AS | Real estate | 1998 |
| Mjøndalen Sportsklinikk AS | Health & social care | 2015 |
| Mjøndalen Zoo & Hjemmebrygg AS | Wholesale & retail | 2015 |
| Monsterbedriften AS | Education | 2017 |
| Mork Finans AS | Real estate | 1998 |
| MR Renhold AS | Administrative & support | 2023 |
| MR. Steel AS | Real estate | 2010 |
| Multi Coating AS | Wholesale & retail | 2024 |
| Multi Engineering AS | Professional & scientific | 1991 |
| N Gruppen Holding AS | Real estate | 2023 |
| N Properties AS | Real estate | 2023 |
| N Takst Og Eiendom AS | Real estate | 2024 |
| N Utleie Og Eiendom AS | Real estate | 2023 |
| Nassau-Norport AS | Manufacturing | 1977 |
| Nedberg Eiendom AS | | 1990 |
| Nedberg Gaard AS | Financial services | 2012 |
| Nemmard AS | Real estate | 2015 |
| Nephthys Holding AS | Financial services | 2022 |
| Nettbil 1 AS | Wholesale & retail | 2023 |
| Next Horizon AS | Real estate | 2023 |
| Nira Tannhelse AS | Health & social care | 2017 |
| Noor Transport AS | Transport & logistics | 2015 |
| Noos Invest AS | | 2021 |
| Nordtech Arkitektur AS | Professional & scientific | 2025 |
| Norges Grill AS | Hospitality | 2019 |
| Norrvik AS | Information & communication | 2019 |
| Norrøna Salg Og Holding AS | Wholesale & retail | 1994 |
| Norsk Formularindustri AS | Manufacturing | 1993 |
| Norsk Lydstudio AS | Information & communication | 2012 |
| Norsk Spesialhandel AS | Wholesale & retail | 2025 |
| Norskdrypp Da | Information & communication | 2023 |
| Nortek Security & Technology AS | Wholesale & retail | 2010 |
| Notodden Urban Hotel AS | Hospitality | 2026 |
| Novi AS | Real estate | 2022 |
| NR1 Bygg AS | Construction | 2025 |
| Nye Vestenga AS | Real estate | 2021 |
| Nyg AS | Professional & scientific | 2013 |
| Nyskapningskompaniet AS | Construction | 1990 |
| Nyva Eiendom AS | | 2022 |
| Nedre Eiker Legesenter A/S | Health & social care | 1987 |
| Næs Bygg & Eiendom AS | Real estate | 2005 |
| Oak Invest AS | | 2017 |
| Odd-Arild Johansen AS | Other services | 2019 |
| OLS1VVS AS | Construction | 2018 |
| Omnicon Norge AS | Wholesale & retail | 2006 |
| Omnicon Nuf | Manufacturing | 2007 |
| Onto AS | Information & communication | 2022 |
| Op Motzfeldt Holding AS | | 2020 |
| Open White AS | Wholesale & retail | 2018 |
| Opticontrol AS | Information & communication | 2023 |
| Optima Wood AS | Professional & scientific | 2020 |
| Optimus Invest AS | Financial services | 2016 |
| Orfs Invest AS | | 2023 |
| Orlund Holding AS | Information & communication | 2024 |