| Lande Malertjenester AS | Construction | 2024 |
| Lande Servicesenter AS | Hospitality | 2002 |
| Langemyr AS | Real estate | 2022 |
| Langvik 2 AS | | 2005 |
| Laning AS | Construction | 2005 |
| Laning Eiendom AS | Construction | 2007 |
| Lars Myhre Østfold AS | Professional & scientific | 1989 |
| Las Holding AS | | 2024 |
| Lauvros AS | Wholesale & retail | 2005 |
| Lege Muhammad Awais AS | Health & social care | 2018 |
| Legene Dahle Og Bergquist Da | Health & social care | 2008 |
| Lei En Biolog AS | Arts & recreation | 2020 |
| Leik Games AS | Information & communication | 2023 |
| Lematy AS | | 2019 |
| Levheim AS | Real estate | 2025 |
| LG Eiendom AS | Real estate | 2005 |
| Lgac Holding AS | | 2023 |
| LH Holding AS | Construction | 2006 |
| Lib Consult AS | | 2023 |
| Linda Helgeland AS | Wholesale & retail | 2025 |
| Lindberg & Nordhavn Bygg AS | Construction | 2023 |
| Link Containment AS | Information & communication | 2025 |
| Link Management Norge AS | Professional & scientific | 1993 |
| Linkvision AS | Wholesale & retail | 2020 |
| Lislebytunet Eiendom AS | Real estate | 2016 |
| Liwi Holding AS | Arts & recreation | 2019 |
| Liza Hajra Frisør AS | Other services | 2025 |
| LJ Eiendom AS | Real estate | 2011 |
| LK Eriksen AS | | 2024 |
| Lmia Norge AS | Wholesale & retail | 2024 |
| LMP AS | | 2019 |
| Loke Consulting AS | Professional & scientific | 2024 |
| Lone Ådalen Kronstad Holding AS | | 2024 |
| Loreta AS | | 2025 |
| Loss Ans | Wholesale & retail | 1989 |
| Loto AS | Real estate | 2016 |
| Lotte Invest AS | Real estate | 2021 |
| LS Offset AS | Manufacturing | 1971 |
| LTG Invest AS | Mining & quarrying | 2005 |
| Lunde Consulting AS | Professional & scientific | 2017 |
| Lundegården AS | Wholesale & retail | 1977 |
| Lunden Barnehage AS | Education | 2004 |
| Lunds Vei 17 AS | Real estate | 2025 |
| Lundsvei 15 AS | Real estate | 2008 |
| Lundsvei 9 AS | Real estate | 2024 |
| Lwe Holding AS | Real estate | 2006 |
| Lykketegning AS | Arts & recreation | 2023 |
| Lys På Vei AS | Real estate | 2008 |
| Løenveien BT1-14 AS | Real estate | 2025 |
| Løvsjø Belysning AB | Wholesale & retail | 1997 |
| M & M Fiske Og Fritid Da | Wholesale & retail | 2001 |
| M.H.Transport AS | Transport & logistics | 2025 |
| M.N. Solutions AS | Professional & scientific | 2024 |
| Ma Kontor & Papir AS | Wholesale & retail | 2024 |
| Ma-Regnskap AS | Professional & scientific | 2016 |
| Magic Burger AS | Hospitality | 2025 |
| Magic Touch AS | Other services | 2018 |
| Mailvideo AS | Information & communication | 2021 |
| Mairos AS | Health & social care | 2008 |
| Maja Hansson Psykiatri Og Kognitiv Terapi AS | Health & social care | 2019 |
| Malerfirma Drillestad AS | Construction | 2023 |
| Malermester Pål-Andre Eriksen AS | Construction | 2005 |
| Managing Culture AS | Professional & scientific | 2007 |
| Mandy AS | Wholesale & retail | 2015 |
| Mango Aero AS | Real estate | 2007 |
| Manstad Bolig AS | Real estate | 2019 |
| Map Invest AS | | 2021 |
| Mapre Holding AS | | 2026 |
| Maria Marberg AS | | 2025 |
| Marihøna Ans | Wholesale & retail | 1985 |
| Marihøna Interiør AS | Wholesale & retail | 1993 |
| Marineshop AS | Wholesale & retail | 2010 |
| Marineshop Eiendom AS | Real estate | 2020 |
| Markedsføreren AS | Professional & scientific | 2021 |
| Markveien 1 AS | Real estate | 2017 |
| Markveien 3 AS | Real estate | 1983 |
| Martine Invest AS | | 2021 |
| Mat & Co Da | Other services | 2016 |
| Match Entreprenør AS | Construction | 2021 |
| Matok AS | Wholesale & retail | 2015 |
| Matok Holding AS | Wholesale & retail | 2015 |
| Matrix Holding AS | | 2026 |
| Matstova Kulturkafé AS | Hospitality | 2025 |
| Maugesten Utvikling AS | Real estate | 2021 |
| Mavors Invest AS | Financial services | 2016 |
| Maxam Tuning AS | Other services | 2008 |
| Maxi-Mini Undertøysalong AS | Wholesale & retail | 1997 |
| Mcss Holding AS | | 2022 |
| Meat Holding AS | Wholesale & retail | 2011 |
| Medicard AS | Health & social care | 2014 |
| Medimaster AS | Health & social care | 2005 |
| Medisinske Hudbehandlinger Og Estetikk AS | Health & social care | 2016 |
| Meglerhuset Borg AS | Real estate | 2010 |
| Mekotek AS | Wholesale & retail | 2024 |
| Melkefabrikken AS | Real estate | 2016 |
| Melleby Invest AS | Real estate | 1979 |
| Mercator AS | Professional & scientific | 1989 |
| Mercator Holding AS | Real estate | 2006 |
| Middleware AS | Information & communication | 2021 |
| Mie Investment AS | | 2021 |