| Lag Nabo AS | Professional & scientific | 2026 |
| Lager & Logistikk AS | Real estate | 2018 |
| Lager 6 AS | Real estate | 2025 |
| LAGER11 AS | Administrative & support | 2014 |
| Lagoa AS | | 2022 |
| Laidback Communication Trondheim Da | Professional & scientific | 2005 |
| Laksanger Holding AS | Financial services | 2005 |
| Laliba Invest AS | Real estate | 2008 |
| Laluna Pro AS | Wholesale & retail | 2022 |
| Lambe AS | Financial services | 2018 |
| Lamoparken Eiendom AS | Real estate | 2018 |
| Landbrukstjenester Trondheim Og Omegn SA | Agriculture & fishing | 1995 |
| Lands AS | | 2020 |
| Landur Invest AS | | 2023 |
| Landvika Invest AS | | 2021 |
| Langeid Arkitektur AS | Professional & scientific | 2024 |
| Langelo AS | Professional & scientific | 2016 |
| Langelo Eiendom AS | Real estate | 2021 |
| Langhold AS | Wholesale & retail | 2014 |
| Langnesvegen 25 AS | Real estate | 2022 |
| Langodden Holding AS | Professional & scientific | 2020 |
| Langseth Holding AS | Financial services | 2017 |
| Langsiktig AS | | 2026 |
| Langvika Holding AS | Real estate | 2005 |
| Langø Holding AS | Professional & scientific | 2005 |
| Langø Service AS | Wholesale & retail | 1990 |
| Langøya AS | Real estate | 2023 |
| Lanto Holding AS | Real estate | 2020 |
| Lantz Arkitekter Nordic AS | Professional & scientific | 2013 |
| Laos Holding AS | Real estate | 2022 |
| Larham AS | | 2018 |
| Lars Herstad AS | Wholesale & retail | 2000 |
| Larsaksen AS | | 2026 |
| Larsed Holding AS | | 2021 |
| Larsen Flowtech AS | Wholesale & retail | 2000 |
| Larsen Vekst AS | Real estate | 1899 |
| Larsi AS | | 2011 |
| Larsn & Johnsen Invest AS | Wholesale & retail | 2021 |
| Lasse Antonsen AS | Financial services | 2007 |
| Lasse Hansen AS | Transport & logistics | 2017 |
| Lasse Nilsen Holding AS | Financial services | 2005 |
| Lasse Sandnes Invest AS | Real estate | 2015 |
| Lassemo Film AS | Information & communication | 2026 |
| Last Holding AS | Arts & recreation | 2006 |
| Latteliten AS | Real estate | 2005 |
| Laugen Holding AS | Information & communication | 2013 |
| Laugsand Holding AS | | 2019 |
| Laugtug Holding AS | Professional & scientific | 2019 |
| Lauguna Fabrikker AS | Real estate | 1964 |
| Laukholm Holding AS | Real estate | 2013 |
| Laukholm Invest AS | Wholesale & retail | 2007 |
| Launchpad AS | Professional & scientific | 2013 |
| Laup AS | Real estate | 2023 |
| Laurantzon AS | Information & communication | 2025 |
| Lav Terskel Da | Arts & recreation | 2019 |
| Lava Nova AS | Administrative & support | 2024 |
| LB Bakklandet Holding AS | Manufacturing | 2014 |
| LB Selskapet AS | Other services | 2019 |
| LBT Holding AS | Real estate | 2005 |
| LC Eiendom I AS | Real estate | 2012 |
| LC Invest AS | Financial services | 2005 |
| LCF Holding AS | Real estate | 2014 |
| LDP Marketing AS | Professional & scientific | 2025 |
| Le Bistro AS | Hospitality | 2005 |
| Le Rocher AS | Information & communication | 2024 |
| Lea Advokatbyrå AS | Professional & scientific | 2012 |
| Lead AS | Professional & scientific | 2011 |
| Leanconsult AS | Administrative & support | 2024 |
| Leangen Bilvask & Bilpleie AS | Other services | 2015 |
| Leangen Bolig AS | Real estate | 2014 |
| Leangen Curling AS | Arts & recreation | 2011 |
| Leangen Fysioterapi AS | Health & social care | 2023 |
| Leangen Hårsenter AS | Other services | 1984 |
| Leangen Invest AS | Real estate | 1990 |
| Leangen Kobber & Blikk AS | Manufacturing | 1991 |
| Leangen Kulturbarnehage SA | Education | 1989 |
| Leangen Legesenter AS | Health & social care | 2012 |
| Leangen Motebutikk AS | Wholesale & retail | 1993 |
| Leangen Næring AS | Construction | 2021 |
| Leangen Parkering AS | Transport & logistics | 2021 |
| Leangen Stasjonsby AS | Real estate | 2003 |
| Leangen Utvikling AS | Real estate | 2016 |
| Leangen Ølutsalg AS | Wholesale & retail | 2017 |
| Leangenbukta AS | Real estate | 2014 |
| Leangenveien 7 Da | Real estate | 2015 |
| Lectus AS | Professional & scientific | 2018 |
| Led Lys AS | Professional & scientific | 2013 |
| Ledlys Norge AS | Wholesale & retail | 2025 |
| Leen Taxi AS | Transport & logistics | 2026 |
| Lefstad Holding AS | | 2022 |
| Leftshift AS | Information & communication | 2022 |
| Lege Artis AS | Arts & recreation | 1997 |
| Lege Kjell Wormdal AS | Health & social care | 2005 |
| Legne AS | Financial services | 2013 |
| Lehmann Marine GmbH Nuf | Professional & scientific | 2025 |
| Leia Holding AS | Professional & scientific | 1991 |
| Leif Holding AS | Agriculture & fishing | 2005 |
| Leif O. Furseth AS | Professional & scientific | 1988 |
| Leiken Invest AS | | 2025 |
| Lein Stenseth Invest AS | Real estate | 2019 |