| Kvelde Eiendom AS | Real estate | 1997 |
| Kveldeveien 88 AS | Real estate | 2024 |
| Kvenndalen AS | Education | 2003 |
| Kverken Holding AS | Manufacturing | 2005 |
| L Felumb AS | Wholesale & retail | 1991 |
| L-A Bygg Og Montasje AS | Construction | 2023 |
| L-Tech AS | Professional & scientific | 2026 |
| L.A.B. Invest AS | | 2021 |
| L.K Consultants Ans | Information & communication | 2026 |
| L.K Holding AS | | 2026 |
| La Piazza - Larvik Da | Hospitality | 2008 |
| Laagen Invest AS | Arts & recreation | 1998 |
| Labe Holding AS | Other services | 2016 |
| Labo Prosjekt AS | Real estate | 2005 |
| Lafayette AS | Other services | 1991 |
| Laleh Media AS | Information & communication | 2025 |
| Lamøya Miljø AS | Water & waste | 2002 |
| Lancing Invest AS | Wholesale & retail | 2005 |
| Landskapere AS | Professional & scientific | 2017 |
| Landyzone AS | Wholesale & retail | 2012 |
| Langseth Eiendom AS | Real estate | 1996 |
| Laradev Software AS | Information & communication | 2024 |
| Lardal Eiendom AS | Real estate | 1999 |
| Laros AS | | 2024 |
| Larry Holding AS | | 2025 |
| Lars Grimstad AS | Wholesale & retail | 1978 |
| Lars Kobro AS | Professional & scientific | 2024 |
| Larvik Autoinvest AS | Wholesale & retail | 2026 |
| Larvik Bemanning AS | Administrative & support | 2023 |
| Larvik Bil AS | Wholesale & retail | 2021 |
| Larvik Billakksenter AS | Other services | 2021 |
| Larvik Bilsenter AS | Wholesale & retail | 2023 |
| Larvik Bruktbil Handel AS | Wholesale & retail | 2013 |
| Larvik by AS | Other services | 1996 |
| Larvik Bygg AS | Construction | 2017 |
| Larvik Bygg Entreprenør AS | Construction | 2021 |
| Larvik Båtverksted AS | Manufacturing | 2019 |
| Larvik Cell AS | Manufacturing | 2002 |
| Larvik Center Holding AS | Real estate | 2006 |
| Larvik Container Transport AS | Transport & logistics | 1999 |
| Larvik Eiendom AS | Real estate | 2019 |
| Larvik Eiendomsmegling AS | Real estate | 2008 |
| Larvik Eiendomsutvikling AS | Real estate | 2017 |
| Larvik Energistasjon AS | Wholesale & retail | 2022 |
| Larvik Engro AS | Wholesale & retail | 2020 |
| Larvik Event AS | Information & communication | 2015 |
| Larvik Fiskesport AS | Wholesale & retail | 2008 |
| Larvik Fotklinikk AS | Health & social care | 2018 |
| Larvik Fysioterapi AS | Health & social care | 1981 |
| Larvik Granite AS | Mining & quarrying | 1986 |
| Larvik Granite Pukk AS | Mining & quarrying | 2021 |
| Larvik Havn Eiendom AS | Real estate | 2024 |
| Larvik Hud Og Laserklinikk AS | Health & social care | 2022 |
| Larvik Håndball Invest AS | Education | 2018 |
| Larvik Impregneringskompani AS | Manufacturing | 1992 |
| Larvik Impregneringskompani Eiendom AS | Real estate | 2019 |
| Larvik Invest AS | Financial services | 1997 |
| Larvik Kobber Og Blikk AS | Construction | 1993 |
| Larvik Last & Bilpåbygg AS | Other services | 2023 |
| Larvik Last Og Buss AS | Other services | 2008 |
| Larvik Maskin Da | Construction | 1997 |
| Larvik Mikrobryggeri AS | Manufacturing | 2011 |
| Larvik Minerals AS | | 2026 |
| Larvik Minigolf AS | Wholesale & retail | 2017 |
| Larvik Montasje AS | Construction | 2023 |
| Larvik Mur & Trefelling Invest | | 2018 |
| Larvik Optikk AS | Wholesale & retail | 1987 |
| Larvik Parkeringshus Da | Real estate | 1996 |
| Larvik Putebiltjeneste AS | Transport & logistics | 2023 |
| Larvik Regnskap AS | Professional & scientific | 2020 |
| Larvik Regnskapsbyrå AS | Professional & scientific | 1967 |
| Larvik Reklame AS | Manufacturing | 1986 |
| Larvik Renhold AS | Administrative & support | 2022 |
| Larvik Rock Armour AS | Wholesale & retail | 2023 |
| Larvik Rørhandel AS | Construction | 1933 |
| Larvik Rørmontasje AS | Construction | 2010 |
| Larvik Rørservice AS | Construction | 2023 |
| Larvik Saneringsselskap AS | Construction | 1969 |
| Larvik Sentrum Frisør AS | Other services | 2019 |
| Larvik Shipping Mol AS | Transport & logistics | 2021 |
| Larvik Solstudio AS | Real estate | 2020 |
| Larvik Storsenter Eiendom 1 AS | Real estate | 2008 |
| Larvik Storsenter Eiendom 2 AS | Real estate | 2008 |
| Larvik Synssenter AS | Wholesale & retail | 1988 |
| Larvik Tann & Kjeveklinikk AS | Health & social care | 2005 |
| Larvik Tannhelse AS | Health & social care | 1998 |
| Larvik Taxi-Transport AS | Transport & logistics | 2023 |
| Larvik Transport AS | Transport & logistics | 2012 |
| Larvik Transportservice Ans | Transport & logistics | 1993 |
| Larvik Trykkluft AS | Manufacturing | 2024 |
| Larvik Turn Fotball AS | Arts & recreation | 2023 |
| Larvik Ur Og Smykker AS | Wholesale & retail | 2009 |
| Larvik Vaktmestertjenester AS | Administrative & support | 2018 |
| Larvik Vaskeri AS | Other services | 1990 |
| Larvik Vedlikehold Da | Other services | 2024 |
| Larvik Ventilasjon AS | Construction | 2012 |
| Larvik VVS AS | Construction | 2021 |
| Larvik Yoga AS | Wholesale & retail | 2025 |
| Larvikadvokatene AS | Professional & scientific | 2013 |
| Larviking AS | Transport & logistics | 1998 |