| Kynovi AS | Professional & scientific | 2024 |
| Kåre Haukås AS | Professional & scientific | 1961 |
| Labach Holding AS | | 2020 |
| Lacesso AS | Professional & scientific | 2019 |
| Lager & Co AS | Transport & logistics | 2020 |
| Lager 76 AS | Real estate | 2018 |
| Laj Holding AS | | 2015 |
| Laj Invest AS | Financial services | 2005 |
| Lama Holding AS | Financial services | 2005 |
| Lambeth Eiendom AS | Real estate | 2023 |
| Landmåleren AS | Financial services | 2013 |
| Langaard Invest AS | | 2024 |
| Lary AS | Professional & scientific | 2026 |
| Lasse Fæste AS | Construction | 2021 |
| Lasse Lauritzen Holding AS | | 2020 |
| Lauritzen Eiendom AS | Wholesale & retail | 2000 |
| Lavie Victory AS | Education | 2010 |
| LB Invest AS | Financial services | 2005 |
| Lca Service AS | Professional & scientific | 2018 |
| Lea Capital AS | Financial services | 2014 |
| Lead Consulting AS | Administrative & support | 2012 |
| Lean Advice AS | Professional & scientific | 2018 |
| Leasebroker Holding AS | Real estate | 2010 |
| Leash AS | | 2020 |
| Lege Ole Norden AS | Health & social care | 2021 |
| Lehus AS | Real estate | 2023 |
| Leidfyr Holding AS | | 2025 |
| Leiumåsen Vann Og Avløp SA | Water & waste | 2011 |
| Lenta AS | Information & communication | 2010 |
| Lett Invest AS | Financial services | 2012 |
| Levent AS | Administrative & support | 2006 |
| Lierhus Boligutvikling AS | Construction | 2015 |
| Lille Paris Eiendom AS | Real estate | 2019 |
| Lilletordivel.No AS | Professional & scientific | 2006 |
| Lin Transport AS | Transport & logistics | 2018 |
| Linderoth Holding AS | | 2025 |
| Lindtruppbakken 2 AS | Real estate | 2022 |
| Linn Isaksen Holding AS | | 2021 |
| Lise Arvesen Invest AS | | 2024 |
| Lise Lauritzen Holding AS | | 2020 |
| Lithun Holding AS | | 2024 |
| LLC Poulsen Holdings Norway AS | Professional & scientific | 2021 |
| LLC Poulsen Scientific Norway AS | Professional & scientific | 2022 |
| Lloyd AS | Real estate | 2020 |
| Lme Holding AS | Wholesale & retail | 2019 |
| Load AS | Information & communication | 2024 |
| Lobe AS | Wholesale & retail | 2021 |
| Lomsdalen Rådgivning AS | Professional & scientific | 2025 |
| LTG Norway AS | Real estate | 2006 |
| Lucservice AS | Other services | 2022 |
| Lunde IT Invest AS | Information & communication | 2016 |
| Lundgren Solutions AS | Professional & scientific | 2020 |
| Lundstrøm AS | Real estate | 1993 |
| Lundstrøm Holding AS | Real estate | 2005 |
| Luxel AS | Real estate | 2019 |
| Lynbil AS | Wholesale & retail | 2023 |
| Lyngmyr Invest AS | Real estate | 2014 |
| Léagency AS | Wholesale & retail | 2019 |
| Løvstad Invest AS | | 2025 |
| M-Holding AS | Professional & scientific | 2021 |
| M.Karlsen Eiendom AS | Real estate | 2026 |
| M.Karlsen Holding AS | Other services | 2018 |
| Magdal AS | Administrative & support | 2008 |
| Magnolia Capital AS | | 2021 |
| Magnus Hjorteset AS | | 2005 |
| Maison Von Tscharner AS | Financial services | 2013 |
| Maktek AS | Manufacturing | 2025 |
| Maktek Nuf | Professional & scientific | 2015 |
| Mal & Miljø AS | Construction | 2018 |
| Malermester Tom Jessen AS | Construction | 2021 |
| Mamisi Multisalg AS | Other services | 2025 |
| Manage People AS | Professional & scientific | 2020 |
| Mantra Event Limited Nuf | Transport & logistics | 2011 |
| Marand Invest AS | Real estate | 2005 |
| Margarinfabrikken AS | Real estate | 2011 |
| Marianne Voldene AS | Wholesale & retail | 2020 |
| Marielas Fitness AS | Education | 2013 |
| Marine Service International AS | Manufacturing | 1995 |
| Marinesanering AS | Professional & scientific | 2019 |
| Marlo AS | Professional & scientific | 2006 |
| Maroosh AS | | 2025 |
| Marstrand Invest AS | Construction | 2008 |
| Marteam. AS | Construction | 2013 |
| Martin Motor AS | Professional & scientific | 2012 |
| Martinsen Management AS | Professional & scientific | 2006 |
| Maskedrømmen AS | Wholesale & retail | 2025 |
| Mawookie Holding AS | Professional & scientific | 2016 |
| Max Canyon AS | Real estate | 2024 |
| Max Håndverkerservice AS | Construction | 2025 |
| Maxilinn Holding AS | Real estate | 2012 |
| MB Byggservice AS | Construction | 2020 |
| MD Auto Lux AS | Wholesale & retail | 2020 |
| Medikom AS | Information & communication | 1982 |
| Medskin AS | Education | 2011 |
| Medula Consulting AS | Information & communication | 2012 |
| Mel Vestby 2 AS | Real estate | 2022 |
| Mentivo AS | Professional & scientific | 2022 |
| Mercuria Marketing AS | | 1998 |
| Mercurienne AS | Administrative & support | 2004 |
| Mercy of Fire HK Art AS | Manufacturing | 2020 |