| Lettfaktura Norge AS | Information & communication | 2005 |
| Levanten AS | Financial services | 1987 |
| Libella AS | Real estate | 2008 |
| Lic Scadenta AS | Wholesale & retail | 1990 |
| Liens Optiske AS | Wholesale & retail | 1981 |
| Lier Lager AS | Real estate | 2006 |
| Lind Legal AS | Professional & scientific | 2025 |
| Lit Holding AS | Real estate | 2020 |
| Lodalen Invest AS | Real estate | 2007 |
| Logic Design AS | Professional & scientific | 2024 |
| Lola&G. AS | Hospitality | 2012 |
| Lommedalsveien 301 AS | Real estate | 2009 |
| Ltxl AS | Construction | 2017 |
| Ludofractal AS | Information & communication | 2024 |
| Luft Holding AS | Information & communication | 2020 |
| Luft Recordings AS | Information & communication | 2024 |
| Luft Studios AS | Information & communication | 2022 |
| Luga Norge AS | Other services | 2012 |
| Lunde Marine AS | Professional & scientific | 2023 |
| Lunden 7 B AS | Real estate | 2017 |
| Lundsrud Regnskap AS | Professional & scientific | 2021 |
| Luong Dahlberg Value Team Ldvt AS | Wholesale & retail | 2021 |
| Lyd & Bilde Expo AS | Wholesale & retail | 1999 |
| Lygren Holding AS | | 2018 |
| Lynneskogen Da | Agriculture & fishing | 2014 |
| Lysaker Sub 1 AS | Hospitality | 2017 |
| Lystad & Nilssen Holding AS | | 2023 |
| Løkketangen 20 AS | Real estate | 2016 |
| Løkkeåsveien Eiendom AS | Real estate | 2020 |
| Løvli AS | Real estate | 1996 |
| Løwe Eiendom AS | Real estate | 2021 |
| M&C Holding AS | | 2024 |
| M+B Web AS | Wholesale & retail | 1994 |
| M.Sohrabi Holding AS | Health & social care | 2018 |
| Maccaphone AS | Arts & recreation | 2013 |
| Mace Consult AS | Professional & scientific | 1987 |
| Mace Invest AS | Professional & scientific | 1985 |
| Mainstay AS | Professional & scientific | 2017 |
| Majas AS | Wholesale & retail | 2021 |
| Makalaus Invest AS | | 2005 |
| Malmskriverveien 35 AS | Real estate | 2026 |
| Malmskriverveien AS | Real estate | 2007 |
| Mandship Holding AS | Real estate | 1997 |
| Mappilots AS | Professional & scientific | 2024 |
| Marbud AS | Construction | 2015 |
| Marihøna Barnehage SA | Education | 1993 |
| Mariposa AS | Wholesale & retail | 2015 |
| Marius Bygg AS | Construction | 2017 |
| Mark and Brandy AS | Wholesale & retail | 2006 |
| Martel Holding AS | | 2024 |
| Martin Bruusgaard AS | Wholesale & retail | 1994 |
| Marwe AS | Financial services | 2007 |
| Mas Fluid Control AS | Professional & scientific | 2009 |
| Masergy Communications Norway Nuf | Information & communication | 2017 |
| Master Service AS | Construction | 2019 |
| Master Trafikkskole AS | Education | 2025 |
| Mayta AS | Other services | 2020 |
| Mbit AS | Professional & scientific | 2026 |
| Mbrflix AS | | 2018 |
| Mcah Holding AS | | 2026 |
| MCL. Invest AS | Financial services | 2005 |
| Mdmp AS | Construction | 2026 |
| Measuremade Da | Professional & scientific | 2012 |
| Medcon AS | Wholesale & retail | 1997 |
| Medina Engros AS | Wholesale & retail | 2021 |
| Medisinsk Senter AS | Health & social care | 1975 |
| Medvind Arkitektur AS | Professional & scientific | 2020 |
| Mega Invest SP Zoo | Construction | 2007 |
| Megalitt AS | | 2005 |
| Mehrwerk AS | Administrative & support | 1986 |
| Melso AS | Health & social care | 2021 |
| Mendai AS | Professional & scientific | 2026 |
| Meta Invest Da | Real estate | 2004 |
| Midttømme Forvaltning AS | Wholesale & retail | 1956 |
| Mie AS | Real estate | 2006 |
| Miki Travel AS | Administrative & support | 1993 |
| Milan Invest AS | | 2024 |
| Mimmis Hundepass AS | Other services | 2026 |
| Mindspa Norge Nuf | Professional & scientific | 2010 |
| Mindstock Holding AS | Financial services | 2018 |
| Mira Consult AS | Professional & scientific | 2019 |
| Miwiso Invest AS | | 2025 |
| Modern Living AS | Real estate | 2012 |
| Modolo AS | | 2024 |
| Moen Saleconsulting AS | Administrative & support | 2025 |
| Mogens Holding AS | Real estate | 2021 |
| Moholdt Holding AS | Financial services | 2005 |
| Molec AS | Manufacturing | 1991 |
| Monetklinikken AS | Health & social care | 2019 |
| Monor AS | Real estate | 2025 |
| Morstad Kapital AS | | 2025 |
| Mosbakk Holding AS | Real estate | 2015 |
| Mosjøen Varme Leasing AS | Energy | 2018 |
| Mover AS | Health & social care | 2020 |
| MPJ AS | Professional & scientific | 2013 |
| MRF Holding AS | | 2025 |
| MSR Frisør AS | Other services | 2026 |
| MT Invest AS | Real estate | 2005 |
| Murmester Løken Petersen AS | Construction | 2021 |
| Music Brokers Scandinavia AS | Information & communication | 1997 |