| Jøru Service AS | Administrative & support | 2023 |
| K Andresens Metallstøperi AS | Real estate | 1976 |
| K Elstad Prosjektledelse AS | Professional & scientific | 2022 |
| K.Kvernmoe AS | Administrative & support | 2024 |
| Kage AS | Real estate | 2006 |
| Kaitlin Invest AS | Construction | 2021 |
| Kanslergaten 10 Holding AS | Professional & scientific | 2013 |
| Kastell Invest AS | Wholesale & retail | 2003 |
| Kent Kran AS | Construction | 2014 |
| Kent Maskin AS | Transport & logistics | 2002 |
| Kib Eiendom AS | Real estate | 2003 |
| Kib Holding AS | Financial services | 2005 |
| Killingdalen Eiendom AS | Real estate | 2019 |
| Killingholmen Vann Og Avløp Drift SA | Water & waste | 2015 |
| Kind AS | Real estate | 2005 |
| Kinogalleriet AS | Information & communication | 2024 |
| Kjeldaas AS | Construction | 1997 |
| Kjeldaas Gruppen AS | | 2025 |
| Kjeldaas Holding AS | Construction | 2017 |
| Kjeldaas Næringsutvikling AS | Real estate | 2025 |
| Kjeldaas Og Reese Eiendom AS | Real estate | 1997 |
| Kjeldner Holding AS | | 2021 |
| Kjeldås AS | | 2019 |
| Kjeldås Holding AS | Financial services | 2005 |
| Kjernetid AS | Wholesale & retail | 2005 |
| Kjevo AS | Real estate | 2018 |
| KL Transport Da | Transport & logistics | 2006 |
| KLAR1 AS | Wholesale & retail | 2016 |
| Klevjerhagen Skole Og Idrettsanlegg AS | Real estate | 2024 |
| Klimaconsult AS | Construction | 2004 |
| Klokkerjordet Utvikling AS | Real estate | 2013 |
| KMK Investing AS | Education | 2019 |
| KMS Interiør AS | Wholesale & retail | 1999 |
| Kobber (Cu) AS | Hospitality | 2024 |
| Kodebjørn AS | Information & communication | 2023 |
| Konglebakken Vann- Og Avløp SA | Water & waste | 2020 |
| Konsta Invest AS | | 2026 |
| Konur Invest AS | Real estate | 2002 |
| Korallen AS | Agriculture & fishing | 2010 |
| Kranfører Conny Lyder AS | Administrative & support | 2025 |
| Krirud AS | Financial services | 2005 |
| Kruge Bygg AS | Wholesale & retail | 2021 |
| Kunstige Blomster AS | Wholesale & retail | 2014 |
| Kvammeroon Telestration AS | Information & communication | 2025 |
| L-Astic AS | Education | 2013 |
| L.P Eiendom AS | Real estate | 2025 |
| L.P Invest AS | | 2025 |
| Lagopus Mater AS | Real estate | 2005 |
| Lagopus Stakkevollan AS | Real estate | 2006 |
| Lambda Invest AS | | 2025 |
| Lauvkollen Eiendom AS | Real estate | 2023 |
| Lavicon AS | Information & communication | 2008 |
| Le Prosjekt AS | Administrative & support | 2021 |
| Ledervekst AS | Education | 2019 |
| Leikvold Villaservice AS | Construction | 2021 |
| Leina Og Hovsmyra Vann Og Avløpslag SA | Water & waste | 2016 |
| Leoc AS | Professional & scientific | 2018 |
| Lersbrygga 14-16 AS | Real estate | 2005 |
| Lersbrygga Holding AS | | 2025 |
| Lersbryggen Bil AS | Other services | 2004 |
| Lersbryggen Eiendom AS | Real estate | 2006 |
| Lerskallen AS | Financial services | 2018 |
| Leve Invest AS | | 2024 |
| LH Consult AS | Professional & scientific | 2019 |
| Likvid AS | | 2024 |
| Lilly Holding AS | Financial services | 2017 |
| Lioness Holding AS | | 2025 |
| Livida Holding AS | | 2025 |
| Liz Wessel Invest AS | Professional & scientific | 2024 |
| Loddon AS | Real estate | 2018 |
| Lsi AS | Manufacturing | 2005 |
| Lsi Eiendom AS | Real estate | 2024 |
| Lsi Welding AS | Manufacturing | 1989 |
| Lukasik & Co Holding AS | | 2026 |
| Luminus AS | Information & communication | 2008 |
| Lund Agro Development AS | Professional & scientific | 2016 |
| Lund Aqua Group AS | Agriculture & fishing | 2016 |
| Lund Aqua Ras Development AS | Agriculture & fishing | 2016 |
| Lund Aqua Sales AS | Wholesale & retail | 2017 |
| Lundby BV AS | Manufacturing | 2014 |
| Lundebo AS | Real estate | 2015 |
| Lux Musikk AS | Arts & recreation | 2018 |
| Lyngbo AS | Real estate | 2002 |
| Lyngbo Eiendom AS | | 2018 |
| Lærum Auto AS | Other services | 2022 |
| Lønnveien Holding AS | Financial services | 2005 |
| M&S Invest AS | Construction | 2019 |
| M.B Consulting Sande AS | Wholesale & retail | 2024 |
| Mafa Holding AS | | 2026 |
| Man Co AS | Professional & scientific | 1992 |
| Marlobobos AS | Manufacturing | 2019 |
| Marsve Invest AS | | 2024 |
| Marthine Ramberg Invest AS | | 2021 |
| Mastad Capital AS | | 2025 |
| Mastadsports AS | Wholesale & retail | 2025 |
| Mathema AS | Financial services | 2005 |
| Matutvikling AS | Professional & scientific | 2017 |
| Mbi Prosjekt AS | Construction | 2026 |
| MCC Holding AS | Professional & scientific | 2020 |
| Mcleod Group AS | Real estate | 2024 |