| Kongsfoss Norge AS | Wholesale & retail | 1993 |
| Konsistens AS | Professional & scientific | 1987 |
| Kontor Engros Oslo AS | Wholesale & retail | 2000 |
| Kortlei AS | Real estate | 2024 |
| Krass AS | Financial services | 2005 |
| Kremjobben AS | Wholesale & retail | 2013 |
| Kristian Og Morfar AS | | 2008 |
| Krogh Eiendom AS | Real estate | 1998 |
| Kryn AS | | 2017 |
| Krynicka Regnskap AS | Professional & scientific | 2013 |
| Ksu Utvikling AS | Real estate | 2021 |
| Kursagenten AS | Information & communication | 2002 |
| Kvikkeline Helsekost Holmen AS | Wholesale & retail | 1991 |
| La Mano AS | Professional & scientific | 2014 |
| Lacertus AS | Professional & scientific | 2008 |
| Lamli AS | Financial services | 2024 |
| Lana Norge AS | Wholesale & retail | 2017 |
| Landsverk AS | Financial services | 2004 |
| Landøya Terrasse Bolig AS | Real estate | 1985 |
| Larsen Rykkje Holding AS | | 2023 |
| Lasse Steen Holding AS | Hospitality | 2005 |
| Lavaro AS | Professional & scientific | 2026 |
| Lederassistanse AS | Professional & scientific | 2014 |
| Lege Tommy Arnesen AS | Health & social care | 2025 |
| Lenes Beauty Box Ltd Nuf | Other services | 2011 |
| Leon Båtkalesjer Design & Søm AS | Manufacturing | 2016 |
| Leween AS | Professional & scientific | 2023 |
| Liaison AS | Professional & scientific | 2012 |
| Lidvard Håheim AS | Professional & scientific | 1976 |
| Lina Luxe AS | Other services | 2026 |
| Liv Ronglan AS | Education | 2018 |
| Liåsen Tjernlia AS | Real estate | 2014 |
| Liåsen Øverliveien AS | Real estate | 2014 |
| Lmlm Invest AS | | 2020 |
| Logiqapps AS | Information & communication | 2019 |
| LP2 Invest AS | Professional & scientific | 2005 |
| Ludvik Og Farfar AS | | 2025 |
| Luna Consultant AS | Professional & scientific | 2025 |
| Lykkefund Holding AS | | 2024 |
| Lynova Holdings AS | | 2025 |
| Lysehjem AS | Wholesale & retail | 2023 |
| Lønnåskollen 34 AS | Real estate | 2017 |
| Løren Izakaya AS | Hospitality | 2022 |
| Løvejord Invest AS | | 2024 |
| M & M Høko Ans | | 1992 |
| M.A Consulting AS | Professional & scientific | 2018 |
| M.A. Holding AS | Hospitality | 2018 |
| Mabech Consulting AS | Professional & scientific | 2025 |
| Macati AS | | 2023 |
| Management & Drift AS | Professional & scientific | 2026 |
| Mantenere AS | Real estate | 2010 |
| Mariem AS | | 2024 |
| Marineservice Holmen Yachtværft AS | Manufacturing | 2024 |
| Marius Otterstad Holding AS | Professional & scientific | 2014 |
| Market Holding AS | | 2024 |
| Martens Holding AS | | 2024 |
| Martin Haukaas Invest AS | | 2022 |
| Math AS | Financial services | 2016 |
| MBW Invest AS | | 2022 |
| MC Helse AS | | 2023 |
| MC Torp Holding AS | | 2026 |
| Mediel AS | Wholesale & retail | 2020 |
| Megastar Holding AS | | 2005 |
| Mehren Og Svenne Da | Professional & scientific | 1998 |
| Melease AS | Administrative & support | 1993 |
| Mellem Nes Invest AS | Real estate | 1991 |
| Mellom-Nes Fus Barnehage AS | Education | 2019 |
| Melvin Kapital AS | | 2026 |
| Mer Soleil AS | | 2022 |
| Merete Norheim Strikkedesign AS | Professional & scientific | 2024 |
| Merlin Capital AS | Financial services | 2016 |
| Metasense AS | Professional & scientific | 2010 |
| Mfa Holding AS | Wholesale & retail | 2023 |
| Mfarm AS | | 2019 |
| Mija Invest AS | | 2025 |
| Mikkel Og Farfar AS | | 2022 |
| Mille Og Farfar AS | | 2025 |
| Min Eiendom AS | Professional & scientific | 2025 |
| Min Frisør AS | Other services | 2014 |
| Miranda's Norge AS | Wholesale & retail | 1996 |
| Mirandas Skin Care AS | Wholesale & retail | 1988 |
| Miro Holding AS | | 2024 |
| MKL Studio Da | Professional & scientific | 2024 |
| Moef AS | Construction | 2025 |
| Moissanite Norge AS | Manufacturing | 2020 |
| Morgensol AS | Real estate | 2007 |
| Morgensol Trading AS | Real estate | 2017 |
| Moroni Invest AS | Information & communication | 2012 |
| Mosebø AS | Construction | 2018 |
| Motorpartner AS | Wholesale & retail | 2020 |
| Msæle AS | | 2024 |
| Mttm Fysioterapi AS | Health & social care | 2022 |
| Multi Design AS | Professional & scientific | 2026 |
| Multi Storkjøkken AS | Wholesale & retail | 1980 |
| Murfeldt AS | | 2019 |
| Mytex AS | Wholesale & retail | 2002 |
| Miele A/S | Wholesale & retail | 1968 |
| Nacab Norge AS | Wholesale & retail | 2021 |
| Nala Health AS | Wholesale & retail | 2020 |
| Namar Holding AS | Professional & scientific | 1996 |