| Langveien 3 AS | Real estate | 2019 |
| Lattice International AS | Professional & scientific | 2021 |
| Lebaco AS | Real estate | 2006 |
| Ledaflow Technologies Da | Professional & scientific | 2013 |
| Ledfront AS | Wholesale & retail | 2026 |
| Ledvance AS | Wholesale & retail | 1946 |
| Lefdal Installasjon AS | Construction | 1994 |
| Lego Norge AS | Wholesale & retail | 1962 |
| Lego System A/S | Wholesale & retail | 1999 |
| Legrand Norge AS | Wholesale & retail | 2020 |
| Lensmannslia 30 AS | Real estate | 2007 |
| Levora AS | Wholesale & retail | 2025 |
| Li Investment AS | Financial services | 2012 |
| Life Mastery Coaching AS | Health & social care | 2021 |
| Liisberg Holding AS | Financial services | 2015 |
| Lilloe Skjøthaug & Co Ans | Wholesale & retail | 1992 |
| Lily Hospitality Group AS | Real estate | 2007 |
| Lind Finans AS | Professional & scientific | 2025 |
| Lindi Holding AS | | 2026 |
| Ln-Arx AS | Administrative & support | 2025 |
| Ln-Xax Air AS | Administrative & support | 2019 |
| LNS Jaren AS | | 2019 |
| Lock Topco AS | | 2014 |
| Loga Innredninger AS | Construction | 2023 |
| Logiopti AS | Professional & scientific | 2009 |
| Logosol AS | Wholesale & retail | 2017 |
| Loj AS | | 2024 |
| Lotus Blossom AS | Financial services | 2017 |
| Louie Hjelpeselskap AS | | 2026 |
| Louie Investor AS | Real estate | 2018 |
| LT 6-12 Holding AS | Real estate | 2019 |
| LT 6-12 Invest AS | | 2018 |
| Ltimindtree Norge AS | Information & communication | 2018 |
| Lucullus Trading AS | Professional & scientific | 2001 |
| Lundavang Utvikling AS | Real estate | 2026 |
| Lundliveien 11 AS | Real estate | 2007 |
| Lunov & Nygård Ans | Manufacturing | 1991 |
| Lura Prosjekt AS | Real estate | 2025 |
| Lusotechnip Engineering | Professional & scientific | 2018 |
| Lybergs Assuranse AS | Financial services | 1989 |
| Lysaker Brygge Holding AS | Real estate | 2013 |
| Lysaker Brygge Næring AS | Real estate | 2007 |
| Lysaker Brygge Tannklinikk AS | Health & social care | 2021 |
| Lysaker Fysioterapi Og Akupunktur AS | Health & social care | 1989 |
| Lysaker Helseklinikk Da | Real estate | 2020 |
| Lysaker Holding AS | Wholesale & retail | 2005 |
| Lysaker Kiropraktor Klinikk AS | Health & social care | 2012 |
| Lysaker Klatresenter Eiendom AS | Real estate | 2020 |
| Lysaker Nova AS | Real estate | 2007 |
| Lysaker Nova Holding AS | Real estate | 2018 |
| Lysaker Optikk AS | Wholesale & retail | 2010 |
| Lysaker Park Eiendom AS | Real estate | 2017 |
| Lysaker Spesialistklinikk AS | Health & social care | 2017 |
| Lysaker Terrasse AS | Real estate | 2007 |
| Lysaker Terrasse Holding AS | Real estate | 2014 |
| Lysaker Torg 5 - 25 Ans | Real estate | 1995 |
| Lysaker Torg Centre AS | Real estate | 2015 |
| Lysakerfjorden Legesenter Da | Health & social care | 2008 |
| Løvdal Invest AS | | 2025 |
| Løwe Holding AS | | 2019 |
| Løwen Invest AS | Real estate | 2017 |
| Løwend AS | Real estate | 2022 |
| M-Effective Holding AS | Professional & scientific | 2014 |
| M. & U. Scott AS | Professional & scientific | 2011 |
| Ma Taxi AS | Transport & logistics | 2024 |
| Mabu Holding AS | | 2021 |
| Maersk Norge AS | Transport & logistics | 1987 |
| Magno Eiendom AS | Real estate | 2021 |
| Magno Utleie AS | Real estate | 2015 |
| Main AS | Real estate | 2021 |
| Major Innovation AS | Professional & scientific | 2023 |
| Malsen Holding AS | Professional & scientific | 2019 |
| Malsen Medical AS | Professional & scientific | 2018 |
| Malvika Næringspark AS | Real estate | 2026 |
| Mana Group AS | Water & waste | 2016 |
| Marexim AS | Wholesale & retail | 1978 |
| Marigold Holdco AS | Mining & quarrying | 2025 |
| Marine Alliance AS | Financial services | 2022 |
| Marine Fuel Services AS | Professional & scientific | 2017 |
| Marine Supply System AS | Transport & logistics | 2023 |
| Marinetrans AS | Transport & logistics | 2001 |
| Marinetrans Holding AS | Transport & logistics | 2019 |
| Marinexpress AS | Transport & logistics | 2024 |
| Marlink AS | Information & communication | 2006 |
| Marmota AS | Information & communication | 2016 |
| Martin Linges Vei 2 AS | Real estate | 2008 |
| Martodden Utbygging AS | Real estate | 2006 |
| Martodden Utbygging KS | Real estate | 2006 |
| Matbazaren.No AS | Wholesale & retail | 2013 |
| Matre Furniture AS | Wholesale & retail | 2024 |
| Maupiti Holding AS | Financial services | 2024 |
| Measure IT AS | Professional & scientific | 2021 |
| Medici AS | Health & social care | 1999 |
| Medicover Norway AS | Health & social care | 2021 |
| Mediterranean Shipping Company Norway AS | Transport & logistics | 1997 |
| Medtronic International Trading Sarl | Wholesale & retail | 2005 |
| Melitta Nordic AS | Wholesale & retail | 2018 |
| Memcare AS | Information & communication | 2015 |
| Mercury Holdco AS | Wholesale & retail | 2021 |
| Meridian Technologies Inc | Manufacturing | 2006 |