| Legendary Arctic AS | Administrative & support | 2025 |
| Legendary Group AS | | 2025 |
| Leif Hansen AS | Professional & scientific | 2003 |
| Leif Lauknes AS | Professional & scientific | 2005 |
| Leifs Allservice Limited Nuf | Hospitality | 2008 |
| Leinavatn AS | Administrative & support | 2008 |
| Lena Schøning AS | Financial services | 2018 |
| Lene Blix Christensen AS | Health & social care | 2020 |
| Lene Hansen Invest AS | | 2017 |
| Leri Holding AS | Financial services | 2018 |
| Lervoll Holding AS | | 2026 |
| Lerøy Aurora AS | Agriculture & fishing | 2003 |
| Lerøy Aurora Sjø AS | Agriculture & fishing | 2022 |
| Lerøy Norway Seafoods AS | Manufacturing | 2010 |
| Leth Sandvik AS | Health & social care | 2014 |
| Level Playing Field AS | Health & social care | 2024 |
| Levvel Helse AS | Education | 2022 |
| Lhgm AS | Health & social care | 2024 |
| LHM Invest AS | Administrative & support | 2012 |
| Liden Invest AS | | 2024 |
| Lifeness AS | Information & communication | 2018 |
| Lighthouse Norway AS | Administrative & support | 2023 |
| Lijo AS | Financial services | 2017 |
| Lilbi AS | Wholesale & retail | 2026 |
| Lilledrogerien AS | Real estate | 2024 |
| Lima Holding AS | Wholesale & retail | 2005 |
| Lima Utvikling AS | Real estate | 2022 |
| Lindmar AS | Professional & scientific | 2026 |
| Lindmar Holding AS | | 2025 |
| Lindreverket AS | Health & social care | 2025 |
| Lindrup Martinsen AS | Wholesale & retail | 1999 |
| Lindrup Martinsen Eiendom AS | Wholesale & retail | 1969 |
| Lining Holding AS | | 2018 |
| Linus Holding AS | | 2023 |
| Lipfish International AS | Wholesale & retail | 2020 |
| Liquid-E Holding AS | Financial services | 2018 |
| Lire Invest AS | Real estate | 2010 |
| Liselakk AS | Other services | 2015 |
| Lit Bygg AS | Construction | 2022 |
| Lita Holding AS | Other services | 2007 |
| Lita Invest Ans | Administrative & support | 1995 |
| Literate AS | Information & communication | 2016 |
| Liv Hanne Haugen AS | Arts & recreation | 2023 |
| Livlii AS | Wholesale & retail | 2023 |
| Lnikolai Invest AS | | 2025 |
| Lo:Le Landskap AS | Professional & scientific | 2016 |
| Lobben Invest AS | Financial services | 2005 |
| Lodve Lange AS | Wholesale & retail | 2009 |
| Loff Og Sirup AS | Health & social care | 2026 |
| Lofoten Lyngen Shipping AS | Administrative & support | 2014 |
| Logins AS | Administrative & support | 2023 |
| Logoped Berit Småbakk AS | Health & social care | 2016 |
| Logoped Inger Marie Brækkan AS | Health & social care | 2025 |
| Lokal Rekruttering AS | Professional & scientific | 2024 |
| Loke AS | Administrative & support | 1995 |
| Lomvia AS | Transport & logistics | 2020 |
| Lomvia Isfjord AS | Administrative & support | 2020 |
| Lomvia Rederi AS | Transport & logistics | 2020 |
| Lomvia Skipsdrift AS | Transport & logistics | 2020 |
| Longfood AS | Hospitality | 2025 |
| Longshot AS | Information & communication | 2018 |
| Lonnée Drift AS | Health & social care | 2026 |
| Lonnée Holding AS | Health & social care | 2026 |
| Lorentsen Holding AS | Financial services | 2016 |
| Lotre AS | Financial services | 2016 |
| Love Tromsø Galleri AS | Wholesale & retail | 2025 |
| LT Tech AS | Manufacturing | 1984 |
| Ltsn Holding AS | | 2023 |
| LTT AS | Real estate | 2024 |
| Lu-Is Holding AS | | 2025 |
| Ludwig Mack AS | Real estate | 1910 |
| Ludwig Mack Brygghus AS | Hospitality | 1998 |
| Lufttransport AS | Transport & logistics | 2013 |
| Lufttransport FW AS | Transport & logistics | 1955 |
| Lufttransport RW AS | Transport & logistics | 2015 |
| Luna Collective AS | Wholesale & retail | 2024 |
| Lundblad Media AS | Manufacturing | 1988 |
| Lunem Holding AS | | 2025 |
| LVN 262 AS | Real estate | 2023 |
| Lycke Frisør AS | Other services | 2016 |
| Lydproduksjon Tromsø AS | Wholesale & retail | 2006 |
| Lyfia AS | Education | 2009 |
| Lyfstone AS | Professional & scientific | 1999 |
| Lyfstone Invest AS | Professional & scientific | 2020 |
| Lyfstone Research & Development AS | Professional & scientific | 2022 |
| Lykkelise AS | | 2023 |
| Lyngen Sea & Ski Lodge AS | Real estate | 2016 |
| Lyngen Seaweed AS | Manufacturing | 2019 |
| Lynx Stay AS | Real estate | 2016 |
| Lys&Mørke AS | Arts & recreation | 2025 |
| Lysvoll Holding AS | | 2025 |
| Lyworks AS | Professional & scientific | 2023 |
| Lås & Beslag Consult AS | Professional & scientific | 2001 |
| Låsesmeden Tromsø AS | Manufacturing | 2009 |
| Løv Finsnekkeri AS | Manufacturing | 2022 |
| M. Appelbom Holding AS | | 2019 |
| M. Bones AS | Financial services | 2011 |
| M.B Holding AS | Real estate | 2016 |
| M.O. Holding AS | | 2023 |
| M.R Holding Tromsø AS | Real estate | 2024 |