| Luxury Treats AS | Wholesale & retail | 2025 |
| Lykka Invest AS | | 2021 |
| Lykkebo Holding AS | Wholesale & retail | 2005 |
| Lyng Markedsføring AS | Professional & scientific | 2022 |
| Lyngestad Consulting AS | Professional & scientific | 2015 |
| Lys & Design Kongsberg AS | Wholesale & retail | 2015 |
| Lågen Renhold AS | Administrative & support | 2005 |
| Lågenlia AS | Real estate | 1993 |
| Løfi Ans | Wholesale & retail | 1986 |
| Løvdal Eiendom AS | Real estate | 2001 |
| Løver Invest AS | Financial services | 2011 |
| Løver Telecom AS | Construction | 2018 |
| Løvern Holding AS | | 2023 |
| Løvetann Film AS | Information & communication | 2025 |
| Løvås Eiendomsdrift AS | Real estate | 2016 |
| M Narverud Transport AS | Transport & logistics | 1997 |
| M.Aakre Holding AS | | 2018 |
| M.Berg AS | Health & social care | 2023 |
| M.M Holding AS | Real estate | 2015 |
| M2SH AS | | 2023 |
| Madsebakken Barnehage AS | Education | 2023 |
| Malefirma Klokseth AS | Construction | 2002 |
| Maler Og Beleggservice AS | Construction | 2021 |
| Malerfirma E.V.K AS | Construction | 2025 |
| Manaheim AS | Administrative & support | 2023 |
| Mango Tree AS | | 2020 |
| Manjavacas AS | | 2025 |
| Manny Trade AS | Wholesale & retail | 2024 |
| Maren Handlerkvartalet AS | Real estate | 2016 |
| Maritgar AS | Real estate | 2011 |
| Marius Haugen AS | Financial services | 2013 |
| Markmanrud Eiendom Ans | Real estate | 1988 |
| Marte Kristoffersen Holding AS | | 2020 |
| Marthe Spiten AS | | 2021 |
| Marty AS | Information & communication | 2005 |
| Mastervik AS | | 2025 |
| Matmons Kongsberg Ans | Hospitality | 1998 |
| Max Camping AS | Hospitality | 2019 |
| Maxfel AS | Real estate | 2013 |
| Maxholding AS | | 2025 |
| Maxim Defense Norway AS | Manufacturing | 2020 |
| Maxwilh AS | Health & social care | 2009 |
| Mbxtricate AS | Arts & recreation | 2016 |
| MC Rør AS | Construction | 2013 |
| MD Leker AS | Wholesale & retail | 2025 |
| Mdhome AS | Wholesale & retail | 1995 |
| Measurement Solutions Norway AS | Manufacturing | 2023 |
| Mediafoto AS | Professional & scientific | 1987 |
| Medilink Software AS | Information & communication | 2018 |
| Mednet AS | Professional & scientific | 1997 |
| Medstrøms AS | Financial services | 2010 |
| Melini AS | Wholesale & retail | 2020 |
| Menosphere Aps | Information & communication | 2026 |
| Mer Norge AS | Construction | 2014 |
| Messemedia AS | Professional & scientific | 2017 |
| Mester Rør AS | Construction | 1987 |
| Metafor AS | Information & communication | 2018 |
| Metris AS | Professional & scientific | 2019 |
| Michael Iversen Holding AS | | 2025 |
| Mico Invest AS | Real estate | 2003 |
| Midi Bygg AS | Construction | 2025 |
| Mikkel Holding AS | | 2025 |
| Mimirflow AS | Manufacturing | 2020 |
| Min Natur AS | Wholesale & retail | 2020 |
| Min Protese AS | Health & social care | 2026 |
| Minner for Livet Foto AS | Professional & scientific | 2017 |
| Mintec Paper AS | Wholesale & retail | 2021 |
| Mirare AS | Information & communication | 2026 |
| MKL Eiendom Holding AS | | 2026 |
| Mlak Ellen AS | Hospitality | 2019 |
| Moane AS | Real estate | 2020 |
| Mobile Autopartner AS | Wholesale & retail | 2002 |
| Mobile Kongsberg AS | Wholesale & retail | 1991 |
| Mobile Ljosland AS | Other services | 1997 |
| Mojo Group AS | Information & communication | 2025 |
| Molar Group AS | Real estate | 2017 |
| Mollvik AS | Information & communication | 2021 |
| Mostra AS | Professional & scientific | 2022 |
| MPH Eiendom AS | Real estate | 2005 |
| MPH Holding AS | Manufacturing | 2005 |
| Mr.Potet Kongsberg AS | Hospitality | 2026 |
| Mucon AS | Professional & scientific | 2008 |
| Mulholland AS | Professional & scientific | 2016 |
| Multilight AS | Professional & scientific | 2026 |
| Muums AS | Hospitality | 2026 |
| Mykes AS | Professional & scientific | 2014 |
| Mynt Arkitekter AS | Professional & scientific | 2025 |
| Myntgata Eiendom AS | Real estate | 1994 |
| Myntgata Utvikling AS | Real estate | 2020 |
| Myrann Holding AS | | 2024 |
| Myrene Utvikling AS | Information & communication | 2018 |
| Mytek AS | Manufacturing | 2021 |
| Møbelringen Studio Kongsberg AS | Wholesale & retail | 2026 |
| Møllebakken Legekontor AS | Health & social care | 2021 |
| Mørkved AS | Real estate | 1983 |
| Møtepunktet Cafe AS | Hospitality | 2018 |
| N2 Teknikk AS | Construction | 2014 |
| Nadines Kitchen AS | Hospitality | 2025 |
| Nails Art Lash & Spa AS | Other services | 2024 |
| Naprapat Mari S Rolfstad AS | Health & social care | 2014 |