| Kjellby Eiendom AS | Real estate | 2016 |
| Kjellby Elektronikk AS | | 2021 |
| Kjetil Kleven AS | Professional & scientific | 2025 |
| Kjøbmandsgården Eiendom AS | Hospitality | 1998 |
| Kjøkken Sør Holding AS | Wholesale & retail | 2005 |
| Kjøkkenmontering AS | Construction | 2016 |
| Kjøkkensenteret Mandal AS | Wholesale & retail | 2005 |
| Klaras Fotpleie AS | Health & social care | 2009 |
| Kleopatra Mote AS | Wholesale & retail | 2015 |
| Kleppdøkk AS | Professional & scientific | 2021 |
| Klev Bygg Og Vedlikehold AS | Administrative & support | 2018 |
| Klevco AS | Real estate | 1982 |
| Kleveveien 4 AS | Real estate | 2008 |
| Klinikken Drift AS | Real estate | 2014 |
| Klinikken Eiendom AS | Real estate | 2000 |
| Knatten AS | Professional & scientific | 2007 |
| Knoll Og Tott Eiendom AS | Real estate | 2010 |
| Knoppen Blomster & Interiør AS | Wholesale & retail | 2024 |
| Knut Amund Leirkjær AS | Construction | 2016 |
| Kokkekollektivet AS | Hospitality | 2017 |
| Kommisjonen Da | Real estate | 2003 |
| Kompetanseforvaltning AS | Administrative & support | 2013 |
| Kongensgate 75A AS | Real estate | 2010 |
| KPS Invest AS | Professional & scientific | 2005 |
| Krafta AS | Wholesale & retail | 2021 |
| KRH Invest AS | Financial services | 2006 |
| Kristoffer Skjebstad Holding AS | Construction | 2023 |
| Krågevika AS | Real estate | 2020 |
| Kurio AS | Information & communication | 2026 |
| Kurspartner AS | Education | 2025 |
| Kvanvig Consulting AS | Professional & scientific | 2016 |
| Kvinen Consult AS | Education | 2007 |
| Kvisla Båthuslag SA | Real estate | 1969 |
| Kvisla Eiendom AS | Real estate | 1999 |
| Kvisla Virke AS | Real estate | 2021 |
| Kvislakroken 5 AS | Real estate | 2007 |
| Kvitmyrveien 2 AS | Real estate | 2020 |
| Kvitmyrveien 38 AS | Real estate | 2024 |
| Kvitmyrveien 42 AS | Real estate | 2023 |
| Kyfi AS | Real estate | 2010 |
| Kåfjord Hyttegrend AS | Real estate | 2013 |
| L.G.O. Holding AS | Wholesale & retail | 2021 |
| L.T. Invest AS | Construction | 2005 |
| La Belle Amie AS | Other services | 2011 |
| La Invest AS | Transport & logistics | 2017 |
| Lami AS | Professional & scientific | 1993 |
| Lampa AS | Wholesale & retail | 2024 |
| Lande Boligfelt AS | Real estate | 2010 |
| Lande Eiendom Invest AS | Real estate | 2001 |
| Lande Gård Da | Hospitality | 2026 |
| Lande Invest AS | Real estate | 2021 |
| Landelius Holding AS | Wholesale & retail | 2018 |
| Landøy Øst AS | Real estate | 2010 |
| Langbråten Holding AS | | 2025 |
| Langeland Gruppen AS | | 2018 |
| Langeskjæran AS | Information & communication | 2016 |
| Langevika Og Søndre Melkevika Renseanlegg SA | Construction | 2010 |
| Langgaten 12 Ans | Real estate | 1986 |
| Lanhau AS | Real estate | 2008 |
| Larsen Optikk AS | Wholesale & retail | 1984 |
| Lass Holding AS | | 2024 |
| Lategne AS | Real estate | 2012 |
| Lategne Holding AS | Real estate | 2012 |
| Latenight AS | | 2021 |
| Launes Invest AS | Wholesale & retail | 1996 |
| Launes Va-Drift SA | Water & waste | 2020 |
| Laustsen Eiendom & Kontor AS | Real estate | 2005 |
| Lauvdal Anlegg AS | Construction | 2012 |
| Lean.No AS | Professional & scientific | 2002 |
| Lege Eeb AS | Health & social care | 2025 |
| Leirgulen Invest AS | Information & communication | 2016 |
| Leirvollen 1A AS | Real estate | 2015 |
| Lekebutikken I Mandal AS | Wholesale & retail | 2022 |
| Lekehuset Sør AS | Wholesale & retail | 2024 |
| Lfi AS | Real estate | 2002 |
| Liguno AS | Wholesale & retail | 1986 |
| Liid Da | | 2010 |
| Lille Danske AS | Wholesale & retail | 2020 |
| Lillebanken AS | | 2025 |
| Limas Inspection AS | Manufacturing | 2004 |
| Linda Holte Transport AS | Transport & logistics | 2013 |
| Linda Stusvik Kile AS | Financial services | 2005 |
| Lindesnes AS | Information & communication | 1989 |
| Lindesnes Brygghus AS | Manufacturing | 2013 |
| Lindesnes Dyreklinikk AS | Professional & scientific | 2026 |
| Lindesnes Ferieutleie AS | Hospitality | 2025 |
| Lindesnes Fiskeriselskab AS | Agriculture & fishing | 2014 |
| Lindesnes Gårdsutvikling AS | Real estate | 2004 |
| Lindesnes Høvleri AS | Manufacturing | 2022 |
| Lindesnes Takst AS | Professional & scientific | 2020 |
| Lindesnes Utleie AS | Administrative & support | 2015 |
| Lindesnesregionen Næringshage AS | Professional & scientific | 2000 |
| Lindesnesspillet AS | Manufacturing | 2020 |
| Lindland Consulting AS | Professional & scientific | 2025 |
| Linkk AS | Professional & scientific | 2015 |
| Lis AS | Financial services | 2005 |
| Litleodd II AS | | 2025 |
| LKS Bygg AS | Professional & scientific | 2008 |
| Lloyds Holding AS | Wholesale & retail | 2015 |
| LMB Eiendomsutvikling AS | Real estate | 2003 |