| LL Moen Consulting Nuf | Administrative & support | 2021 |
| Lmjt Holding AS | | 2025 |
| Loco Mosquito Media Da | Professional & scientific | 2016 |
| Long Shot Holding AS | Professional & scientific | 2026 |
| Loppo 7 AS | Wholesale & retail | 2026 |
| Loppo 8 AS | Wholesale & retail | 2026 |
| Loppo Fredrikstad AS | Wholesale & retail | 2025 |
| Loppo Kristiansand AS | Wholesale & retail | 2024 |
| Loppo Larvik AS | Wholesale & retail | 2026 |
| Loppo Norge AS | Wholesale & retail | 2022 |
| Loppo Porsgrunn AS | Wholesale & retail | 2025 |
| Loppo Sandefjord AS | Wholesale & retail | 2022 |
| Loppo Skien AS | Real estate | 2022 |
| Lorgnetten AS | Wholesale & retail | 2002 |
| Lot Eiendom AS | Real estate | 2025 |
| Loud N' Clear Da | Arts & recreation | 2019 |
| LPG Grenland AS | Wholesale & retail | 2006 |
| LPR Eiendom AS | Real estate | 2005 |
| LR Holding AS | Construction | 2020 |
| LS Eiendomsutvikling AS | Real estate | 2024 |
| Lsa Eiendom AS | Real estate | 2025 |
| LT Partnertjenester AS | Administrative & support | 2020 |
| Lts-Holding AS | | 2026 |
| Luane Syftestad Ans | Arts & recreation | 2024 |
| Lucky Invest AS | Real estate | 2005 |
| Lucky-Holding AS | Financial services | 2014 |
| Lucky-Invest AS | | 2019 |
| Ludusy AS | Information & communication | 2019 |
| Lulzime Eiendom AS | Real estate | 2020 |
| Lun Drue AS | | 2018 |
| Lunamax AS | Real estate | 2021 |
| Lunde Bygg AS | Construction | 2014 |
| Lunde Disc Golf AS | Arts & recreation | 2022 |
| Lunde Maskinstasjon AS | Construction | 2021 |
| Lunde Vannverk | Water & waste | 1971 |
| Lundedalen Næringspark AS | Real estate | 2018 |
| Lundegata Eiendom AS | Real estate | 2015 |
| Lundegt. 21 AS | Professional & scientific | 2013 |
| Lunden Holding AS | Financial services | 2007 |
| Lundetangen Kontorpark AS | Real estate | 2019 |
| Lundetangen Pub Drift AS | Hospitality | 2014 |
| Lundgreens Eiendomsselskap AS | Professional & scientific | 1989 |
| Lune Rede AS | Wholesale & retail | 2014 |
| Lurifax Invest AS | | 2026 |
| Lux Rådgivning AS | Professional & scientific | 2020 |
| Lycan Consulting AS | Professional & scientific | 2023 |
| Lycan Management AS | Professional & scientific | 2022 |
| Lyft Invest AS | | 2023 |
| Lyk-Z & Døtre AS | Information & communication | 2011 |
| Lyk-Z Solutions AS | Education | 2023 |
| Lykkeli Invest AS | Financial services | 2016 |
| Lyng & Løberg AS | Construction | 1984 |
| Lyngbakken Kontorsenter AS | Real estate | 2009 |
| Lyngbakkvegen 5 AS | Real estate | 2015 |
| Lyngbakkvegen AS | Real estate | 2021 |
| Lynx Handel AS | Professional & scientific | 2022 |
| Lyr Design AS | Professional & scientific | 2015 |
| Lysø Flis & Naturstein AS | Wholesale & retail | 2008 |
| Lyvjaberg Invest AS | | 2022 |
| LZN AS | Professional & scientific | 2022 |
| Liegt 7 AS | Real estate | 1985 |
| Lås Og Beslag AS | Wholesale & retail | 1999 |
| Låven Antikk Og Auksjon AS | Wholesale & retail | 2018 |
| Låven Antikt Og Annet Ans | Wholesale & retail | 1990 |
| Løberg Invest AS | Financial services | 2013 |
| Løberg Økonomi AS | | 2000 |
| Løkka 9 AS | Real estate | 2017 |
| Lønnebakke 10 AS | Real estate | 2021 |
| Lønnetreet Holding AS | Health & social care | 2025 |
| Løv Design AS | Manufacturing | 2017 |
| Løveid AS | Real estate | 2005 |
| Løvenskiold-Fossum Forvaltning Ans | Agriculture & fishing | 2005 |
| Løvenskiold-Fossum Kraft AS | Energy | 2009 |
| Løvenskiold-Fossum Kraft Drift AS | Real estate | 2011 |
| Løvenskiold-Fossum Skog Ans | Agriculture & fishing | 2005 |
| Løvenskiold-Fossum Tomteselskap AS | Real estate | 2017 |
| Løvsjø AS | Professional & scientific | 2025 |
| Løvstad Bygg AS | Construction | 2021 |
| Løvstad Capital Holding AS | Construction | 2022 |
| Løvstad Eiendom AS | Real estate | 2022 |
| M Aasland Holding AS | | 2019 |
| M Evensen Holding AS | | 2026 |
| M Park - Anlegg AS | Administrative & support | 1999 |
| M R Holding AS | Construction | 2016 |
| M&G Holding AS | Wholesale & retail | 2014 |
| M-Solution AS | Manufacturing | 2020 |
| M.R Transportservice AS | Transport & logistics | 2025 |
| M/S Skarsfos AS | Transport & logistics | 2011 |
| M2 Hus AS | Construction | 2018 |
| M2M Eiendom AS | Real estate | 2015 |
| M3 Media AS | Professional & scientific | 2005 |
| M: Skien AS | Wholesale & retail | 2008 |
| Maad Holding AS | | 2024 |
| Mabuer Invest AS | | 2022 |
| Made for Movement AS | Wholesale & retail | 2008 |
| Made for Movement Group AS | Manufacturing | 2007 |
| Madebyme AS | Other services | 2013 |
| Madi Holding AS | Real estate | 2026 |
| Madsen Holdings AS | Information & communication | 2022 |
| Madsen Visuals AS | Information & communication | 2023 |