| Lou Interiør AS | Professional & scientific | 2022 |
| Loupchamp Holding AS | Professional & scientific | 2005 |
| Lovia AS | Real estate | 1998 |
| LT Drammen AS | | 2026 |
| LTT Invest AS | Transport & logistics | 1992 |
| Lucitania Holding AS | | 2025 |
| Luis Holding AS | | 2022 |
| Lujic Bilservise AS | Other services | 2023 |
| Lukeli Holding AS | Professional & scientific | 2018 |
| Lund Eiendom AS | Real estate | 1994 |
| Lund Invest & Consulting AS | Professional & scientific | 2016 |
| Lund Invest Holding AS | Real estate | 2005 |
| Lund Oil AS | Real estate | 2012 |
| Lund Oljesenter AS | Wholesale & retail | 2008 |
| Lundby Og Rygg AS | Construction | 2016 |
| Lundby Og Rygg Maskin AS | Administrative & support | 2018 |
| Lundell Installasjon AS | Construction | 2022 |
| Lungeklinikken AS | Health & social care | 2017 |
| Lurendreier AS | | 2023 |
| Lutech Elektro AS | Construction | 2026 |
| Luth AS | Real estate | 2023 |
| Luxdesign AS | Professional & scientific | 2003 |
| Luxia AS | Wholesale & retail | 2023 |
| LVH AS | | 2024 |
| Lxry AS | Professional & scientific | 2025 |
| Lyche Investering AS | Professional & scientific | 2011 |
| Lyche Konvolutt Holding AS | Financial services | 2005 |
| Lyche Management AS | Administrative & support | 2006 |
| Lyche Prosjekter AS | | 2018 |
| Lydmannen AS | Arts & recreation | 2016 |
| Lylner Invest AS | Wholesale & retail | 2025 |
| Lyngås Næringspark AS | Real estate | 2021 |
| Lynoryx AS | Wholesale & retail | 2026 |
| Lysets Holding AS | | 2024 |
| Lysholm Bil Drammen AS | Wholesale & retail | 2022 |
| Lobbens Renhold og kantine ANS | Administrative & support | 1987 |
| Lås & Glass AS | Manufacturing | 2012 |
| Løitegård Eiendom AS | Real estate | 2017 |
| Løitegård Holding AS | Real estate | 2009 |
| Løkka Hage & Service Da | Administrative & support | 2024 |
| Lønnebakke 3 AS | Real estate | 2021 |
| Lønnebakke 4 AS | Real estate | 2021 |
| Løstegård AS | | 2019 |
| Løven Sitt AS | | 2023 |
| Løvetann Konsult AS | Professional & scientific | 2020 |
| Løyse Holding AS | | 2023 |
| M&N Invest AS | | 2022 |
| M-Tek AS | Professional & scientific | 2002 |
| M-Tek Holding AS | Professional & scientific | 2018 |
| M-Tett AS | Construction | 2002 |
| M. Gezen AS | Information & communication | 2025 |
| M.A.S Invest AS | Wholesale & retail | 2026 |
| M.G Ledelse Og Utvikling AS | Professional & scientific | 2026 |
| M/S Drammen AS | Transport & logistics | 2024 |
| M/S Invest | | 2023 |
| M2 Secure AS | Information & communication | 2013 |
| M2SP Consulting AS | Professional & scientific | 2026 |
| Ma Haque Butikkdrift AS | Wholesale & retail | 2026 |
| Mabro AS | Real estate | 1971 |
| Macama Organisasjonsutvikling AS | Professional & scientific | 2009 |
| Madaket AS | Wholesale & retail | 2023 |
| Madness Studio AS | Education | 2022 |
| Mads Consulting AS | Professional & scientific | 2014 |
| Mafob Holding AS | | 2021 |
| Magenta AS | Other services | 2022 |
| Maggieduttie AS | Information & communication | 2016 |
| Magne Prestegården AS | Real estate | 2017 |
| Magnum Holding AS | Financial services | 2008 |
| Magnus Hermansson AS | Information & communication | 2012 |
| Magur Holding AS | Financial services | 2018 |
| Maha Film AS | Information & communication | 2015 |
| Major'N AS | Professional & scientific | 2005 |
| Makani Invest AS | Financial services | 2018 |
| Make Media AS | Professional & scientific | 2024 |
| Makkern Invest AS | Real estate | 2011 |
| Makrel AS | | 2018 |
| Maler Eliassen AS | Construction | 2019 |
| Maler Team AS | Construction | 2020 |
| Malergata Utvikling AS | Real estate | 2023 |
| Malermester Buer Drammen AS | Construction | 2006 |
| Malex AS | Construction | 2022 |
| Malitaz AS | Financial services | 2005 |
| Malken AS | | 2019 |
| Malling & Co Drammen AS | Real estate | 1993 |
| Mammoet Deutschland GmbH | Construction | 2020 |
| Manora Massasje AS | Other services | 2022 |
| Manz Holding AS | | 2022 |
| Mar-Kem AS | Manufacturing | 1992 |
| Marasli AS | Hospitality | 2022 |
| Marcela Invest AS | Financial services | 2007 |
| Marchmain AS | Financial services | 2005 |
| Marcs AS | | 2025 |
| Marem AS | | 2020 |
| Marenseter Holding AS | Real estate | 2008 |
| Marf Invest AS | | 2020 |
| Margrethe Otto Skar AS | Education | 2023 |
| Mari Access Solution AS | Construction | 2021 |
| Mari Fjøsne Holding AS | Administrative & support | 2023 |
| Mariad AS | | 2024 |
| Marianne a. Lervik AS | Administrative & support | 2020 |