| Laup.Ai AS | Information & communication | 2026 |
| Lavo AS | | 1990 |
| Lavpris Deler AS | Wholesale & retail | 2013 |
| Lax Invest AS | | 2017 |
| LB Investment AS | | 2021 |
| LC Huseklepp AS | Professional & scientific | 2022 |
| Leadtality AS | Professional & scientific | 2023 |
| Ledende Elkontroll AS | Information & communication | 2024 |
| Ledende Eltakst AS | Professional & scientific | 2023 |
| Lednor Nuf | Wholesale & retail | 2010 |
| Lege Even Askeland AS | Health & social care | 2013 |
| Lege Hege Beate Løkebø AS | Health & social care | 2014 |
| Lege Henden AS | Health & social care | 2012 |
| Lege Ivar Aartun AS | Health & social care | 2005 |
| Lege K Gylthe AS | Health & social care | 2013 |
| Lege Kiær AS | Health & social care | 2024 |
| Lege Marte Holstad AS | Health & social care | 2023 |
| Lege Mina Klaveness AS | Health & social care | 2021 |
| Legehuset Sandefjord AS | Health & social care | 2015 |
| Legene Nord AS | Health & social care | 2026 |
| Legene Sentrum Vest Da | Health & social care | 1999 |
| Leico Danmark | Wholesale & retail | 2026 |
| Leif Weldings Vei 14 AS | Real estate | 2012 |
| Leif Weldings Vei 16 AS | Real estate | 2016 |
| Leif Weldings Vei 18-20 AS | Real estate | 2016 |
| Leif Weldingsvei 12 Eiendom AS | Real estate | 2012 |
| Lekehuset Sandefjord AS | Wholesale & retail | 2022 |
| Lekeplaneten Sandefjord AS | Wholesale & retail | 2003 |
| Lenes Aktivum AS | Real estate | 2005 |
| Lenes Eiendom AS | Real estate | 1970 |
| Lenk Invest AS | | 2022 |
| Leo Invest AS | Financial services | 2004 |
| Leonardos Brygga AS | Hospitality | 2010 |
| Les Eiendom AS | Real estate | 2020 |
| Let's Ink Mini Sandefjord AS | Other services | 2025 |
| Leth Holding AS | | 2026 |
| Leth Taksering AS | Real estate | 2024 |
| Lev Aktivt AS | Information & communication | 2020 |
| LFB Invest AS | | 2024 |
| Liavik Eiendom AS | Real estate | 1966 |
| Libenter AS | Professional & scientific | 2018 |
| Libera Te Invest Holding AS | | 2021 |
| Lida Eiendom AS | Real estate | 1998 |
| Lie-Haugen Holding AS | Real estate | 2015 |
| Lifjell Trosvikhytta SA | Real estate | 1957 |
| Lik AS | | 2018 |
| Likse AS | | 2023 |
| Lille Huong Asia Mat AS | Wholesale & retail | 2017 |
| Lillebyparken AS | Arts & recreation | 2020 |
| Lilleengen Consulting AS | | 2017 |
| Lilon Holding AS | | 2025 |
| Limonthe AS | Information & communication | 2026 |
| Linaae Eiendom AS | Real estate | 2022 |
| Lindhjem Investment AS | Professional & scientific | 2020 |
| Lindhjem Regnskap AS | Professional & scientific | 2020 |
| Lindit AS | Wholesale & retail | 2015 |
| Lindstrøm Marine Agencies AS | | 2005 |
| Lingaas Consulting AS | Education | 1994 |
| Lingelemveien 461 AS | Real estate | 2022 |
| Lingen Invest AS | Financial services | 2011 |
| Linholm AS | Real estate | 1997 |
| Linkaway AS | Information & communication | 2020 |
| Lise Invest AS | | 2019 |
| Litex AS | Manufacturing | 2015 |
| Live Eiendom AS | Real estate | 2017 |
| Livelink AS | Information & communication | 2025 |
| Liverød Invest AS | | 2021 |
| Livets Gang AS | Education | 2001 |
| Living Flex Holding AS | Real estate | 2022 |
| Living in a Box AS | Wholesale & retail | 2016 |
| Livsverket AS | Real estate | 2026 |
| LJ Future Holding AS | | 2025 |
| LJB Holding AS | | 2025 |
| LK Eiendom AS | Real estate | 2014 |
| LK Frisører AS | Other services | 2006 |
| LK Interiørarkitektur AS | Professional & scientific | 2018 |
| Lman AS | Real estate | 2016 |
| Lmha Holding AS | | 2023 |
| Locus Solutions AS | Information & communication | 1983 |
| Lodd AS | Information & communication | 2026 |
| Lodin Holding AS | | 2026 |
| Lofterød Eiendom AS | Real estate | 2011 |
| Lofterødkilen Eiendom AS | Real estate | 2015 |
| Loftum Bygg Og Eiendom AS | Construction | 2001 |
| Loftum Eiendom AS | Real estate | 2015 |
| Logistikkavdelingen AS | Professional & scientific | 2013 |
| Logoped Hanna Lysaker Mnll AS | Health & social care | 2024 |
| Lomo Invest AS | Wholesale & retail | 2017 |
| Longva Holding AS | Professional & scientific | 2010 |
| Loopefy AS | Wholesale & retail | 2019 |
| LPG Norge AS | Wholesale & retail | 2009 |
| LR Transport AS | Transport & logistics | 1994 |
| LRT Eiendom AS | Transport & logistics | 2000 |
| LS11 Holding AS | | 2021 |
| Lu Invest AS | Information & communication | 2022 |
| Luberth AS | Information & communication | 2024 |
| Lucama AS | Information & communication | 2021 |
| Lufith AS | Wholesale & retail | 2023 |
| Lufthavntjenester AS | Administrative & support | 1998 |
| Luftig AS | Wholesale & retail | 2021 |