| Larvikite AS | Manufacturing | 2010 |
| Larvikittblokka AS | Manufacturing | 2018 |
| Larvikmegler'N AS | Real estate | 1997 |
| Larviks Begravelsesbyrå AS | Other services | 2016 |
| Larviksveien Eiendom AS | Real estate | 2011 |
| Larvikøkonomene AS | Professional & scientific | 2021 |
| Lasken Tunet AS | Real estate | 1983 |
| Laskenvn 4 AS | Real estate | 1998 |
| Lasse Johannessen Transport AS | Transport & logistics | 2023 |
| Lasse Johnson Teknikk AS | Manufacturing | 2026 |
| Laud Design AS | Professional & scientific | 2014 |
| Laud Media AS | Information & communication | 2005 |
| Launchpoint AS | Information & communication | 2024 |
| Launchpoint Holding AS | Information & communication | 2024 |
| Laura Eiendom AS | Real estate | 1989 |
| Laurvig Eiendom AS | Real estate | 2016 |
| LB Elektro AS | Construction | 2015 |
| Leans Cafe Og Wok AS | Hospitality | 2017 |
| Leblon Group AS | Real estate | 2005 |
| Lege Eystein Vik AS | Health & social care | 2025 |
| Lege Masilo AS | Health & social care | 2015 |
| Legegruppen AS | Health & social care | 1979 |
| Legene Mayo AS | Health & social care | 2025 |
| Leif CHR Blomquist AS | Real estate | 1982 |
| Leif Gjestrum Larsen AS | Wholesale & retail | 1977 |
| Leikvang Barnehage SA | Education | 1990 |
| Leinæs Holding AS | Other services | 1983 |
| Lekebank AS | | 2021 |
| Lemonfish AS | Information & communication | 2026 |
| Lets Ink Larvik AS | Other services | 2025 |
| Lett-Tak Eiendom AS | Real estate | 1980 |
| Lett-Tak Systemer AS | Manufacturing | 2005 |
| Lette AS | Information & communication | 2025 |
| Levekraft AS | Professional & scientific | 2014 |
| Levvel AS | Professional & scientific | 2006 |
| Lex-Eiendom AS | Real estate | 2016 |
| Lexaro AS | Professional & scientific | 2023 |
| Lexaro Invest AS | Wholesale & retail | 2024 |
| Lexaro Lawtech AS | Information & communication | 2025 |
| Li-Holding AS | Manufacturing | 2018 |
| Liabridge AS | Financial services | 2011 |
| Libe AS | Hospitality | 2013 |
| Libe Drift Da | Administrative & support | 2025 |
| Liberg AS | Construction | 2002 |
| Lien Holding AS | Administrative & support | 2019 |
| Lien Legetjenester AS | Health & social care | 2025 |
| Liens Storkiosk AS | Wholesale & retail | 2014 |
| Life Consulting AS | | 2019 |
| Liftoff Event Management AS | Professional & scientific | 2015 |
| Liftoff Holding AS | Arts & recreation | 2015 |
| Liftwave Solutions AS | Wholesale & retail | 2023 |
| Lille Wedelsborg Invest AS | | 2022 |
| Lille-Vidunder AS | Wholesale & retail | 2023 |
| Lillekleiver AS | | 2020 |
| Limitech Ans | Information & communication | 1991 |
| Lineage Larvik AS | Transport & logistics | 1970 |
| Lineto AS | Financial services | 2013 |
| Link Logistikk AS | Transport & logistics | 2019 |
| Link Products Da | Wholesale & retail | 2004 |
| Linnk AS | | 2017 |
| Linns Gofrys Limited Nuf | Wholesale & retail | 2025 |
| Lion Holding AS | Professional & scientific | 1997 |
| Lion Property AS | Real estate | 2015 |
| Liå Holding AS | | 2022 |
| Ljosland Optikk AS | Wholesale & retail | 1989 |
| LKS Engineering & Services AS | Construction | 2025 |
| LM Entreprenør AS | Construction | 2026 |
| LMH Service AS | Manufacturing | 2018 |
| Loa Eiendom AS | Real estate | 2025 |
| Loa Holding AS | | 2025 |
| Locksley Invest AS | Real estate | 2009 |
| Locusbase AS | Information & communication | 2023 |
| Lodax AS | Wholesale & retail | 2019 |
| Logihub AS | Transport & logistics | 2000 |
| Logoteket AS | Health & social care | 2024 |
| Lomme & Co. AS | | 2005 |
| Lomme Eiendom AS | Real estate | 2016 |
| Los Digital AS | Manufacturing | 1998 |
| Lotus Senteret AS | Education | 2017 |
| Loveboat Invest AS | Professional & scientific | 2026 |
| LPP Holding AS | Real estate | 2005 |
| LS Autolakk AS | Other services | 2019 |
| LT Eiendom AS | Real estate | 1988 |
| LT Næringsbygg AS | Real estate | 2013 |
| Ltrustad AS | Health & social care | 1997 |
| Lucerna Engineering AS | Professional & scientific | 2016 |
| Lucky Studio AS | Transport & logistics | 2023 |
| Ludin Holding AS | | 2025 |
| Luft AS | Construction | 2017 |
| Lumosmed AS | Health & social care | 2024 |
| Lun Sol AS | Wholesale & retail | 2025 |
| Lund Capital AS | Real estate | 2006 |
| Lundhs Aggregates AS | Mining & quarrying | 2021 |
| Lundhs AS | Mining & quarrying | 2008 |
| Lundhs Eiendom AS | Real estate | 2013 |
| Luux Fot & Velvære AS | Health & social care | 2024 |
| Lyd & Tele Larvik AS | Wholesale & retail | 2013 |
| Lydhus Driftsforetak for Vann Og Avløp SA | Water & waste | 2020 |
| Lykka Sandbox AS | Wholesale & retail | 2021 |
| Lyskollektivet AS | Professional & scientific | 2021 |