| Kongsberg Tilhengerservice AS | Wholesale & retail | 2014 |
| Kongsberg Tox Removal AS | Professional & scientific | 2023 |
| Kongsberg Trading AS | Wholesale & retail | 2018 |
| Kongsberg Trafikkskole AS | Education | 1994 |
| Kongsberg Transport AS | Transport & logistics | 1993 |
| Kongsberg Tur Og Transport AS | Transport & logistics | 2014 |
| Kongsberg Utemiljø AS | Administrative & support | 2023 |
| Kongsberg Utleie AS | Real estate | 2008 |
| Kongsberg Utleieservice AS | Administrative & support | 2019 |
| Kongsberg Utvikling AS | Real estate | 2022 |
| Kongsberg Varmepumpe AS | Construction | 2023 |
| Kongsberg Veterinærkontor AS | Professional & scientific | 2008 |
| Kongsberg Våpenfabrikk AS | Manufacturing | 2011 |
| Kongsberg Øre-Nese-Hals Klinikk AS | Health & social care | 2014 |
| Kongsberg.No Invest Limited | Transport & logistics | 2024 |
| Kongsberg.No Taxi Limited Nuf | Transport & logistics | 2024 |
| Kongsberghus AS | Construction | 2007 |
| Kopisenteret Kongsberg AS | Manufacturing | 2004 |
| Kraft Pizzeria Kongsberg AS | Hospitality | 2023 |
| Krag Eiendom AS | Real estate | 2019 |
| Kransen AS | Health & social care | 2018 |
| Kreativ Hus Og Hytteutvikling Ans | Real estate | 2003 |
| Kri Innovation Ans | Professional & scientific | 2014 |
| Krico Norway AS | Manufacturing | 1999 |
| Krisco AS | Real estate | 2016 |
| Krisco Eiendom AS | Real estate | 1983 |
| Krisco Hotel AS | Real estate | 2009 |
| Krisco Invest AS | Real estate | 1993 |
| Krisco Utvikling AS | Real estate | 1996 |
| Kristine Klær AS | Wholesale & retail | 2016 |
| Krokstad Handelseiendom AS | Real estate | 2010 |
| Kso AS | Real estate | 2020 |
| Kta Naval Systems AS | Information & communication | 2017 |
| Kuling Holding AS | | 2021 |
| Kunstsamleren AS | Wholesale & retail | 2002 |
| Kvadratera AS | Real estate | 2017 |
| Kvadratera Invest 13 AS | Transport & logistics | 2020 |
| Kvadratera Invest 15 AS | | 2022 |
| Kvadratera Invest 17 AS | | 2022 |
| Kvadratera Invest 18 AS | | 2022 |
| Kvante Holding AS | Real estate | 1997 |
| Kvålseth Holding AS | Construction | 2023 |
| Kvålseth Mur Og Puss AS | Construction | 2023 |
| Kvålskås Eiendom AS | Real estate | 2016 |
| Kys Holding AS | Real estate | 2007 |
| Kåre Rustand AS | Real estate | 2005 |
| L2 Innovasjon AS | | 2019 |
| Laagen Dampskibsselskab AS | Professional & scientific | 2019 |
| Laagen Legesenter AS | Health & social care | 1974 |
| Laagendalsposten AS | Information & communication | 2014 |
| Laagenpsykologen AS | Health & social care | 2023 |
| Lafteråsen Utbygging AS | Real estate | 2013 |
| Lakris Kapital AS | | 2023 |
| Lama Eiendom AS | Real estate | 2026 |
| Lampeland Bakeri Og Konditori AS | Wholesale & retail | 1972 |
| Langefonn AS | Real estate | 2008 |
| Langekjenntunet Barnehage AS | Education | 2022 |
| Langmyr Bygg Og Anleggsservice AS | Construction | 2022 |
| LB Konsult AS | Professional & scientific | 2022 |
| LBS Invest AS | | 2021 |
| Ledo Drive AS | Transport & logistics | 2025 |
| Legasi Holding AS | | 2025 |
| Lege Laila Røise AS | Health & social care | 2016 |
| Legegruppen Kongsberg AS | Health & social care | 1988 |
| Legene I Schwabes Gate AS | Real estate | 2019 |
| Legu Holding AS | Real estate | 2013 |
| Leih AS | Real estate | 2025 |
| Leih Eiendom AS | Real estate | 2025 |
| Leih Fall AS | Real estate | 2025 |
| Leih Risteigen AS | Real estate | 2025 |
| Lein - Byggkonsult AS | Professional & scientific | 2023 |
| Leina Holding AS | Real estate | 2011 |
| Lek & Ro Kongsberg AS | Arts & recreation | 2025 |
| Lev Vel AS | Wholesale & retail | 2005 |
| Lia Og Andersen Gaardsdrift Ans | Real estate | 2015 |
| Liacoaching AS | Professional & scientific | 1987 |
| Liatoppen Holding AS | | 2021 |
| Liatoppen Panorama AS | Real estate | 2005 |
| Liengården Kongsberg AS | Real estate | 2003 |
| Lifetools AS | Information & communication | 2017 |
| Liga Eiendom AS | Real estate | 2017 |
| Liljedalen Holding AS | | 2026 |
| Lille Og Bittelille AS | Hospitality | 2026 |
| Lilywhites AS | | 2010 |
| Lindstad Eiendom AS | Real estate | 2019 |
| Liontech Development AS | Manufacturing | 2020 |
| Livs Dagligvare Ans | Wholesale & retail | 1989 |
| LMF Holding AS | | 2025 |
| Lobo Vision AS | Administrative & support | 2004 |
| Logegården Kongsberg AS | Real estate | 2000 |
| Logopedi Lab AS | Health & social care | 2020 |
| Logopedkontoret AS | Health & social care | 2021 |
| Logos Media Limited Nuf | Arts & recreation | 2009 |
| Loop Tackle AS | Wholesale & retail | 2013 |
| Lortebuseter Vann Og Avløpsselskap AS | Real estate | 2018 |
| Lortebuveien SA | Real estate | 2021 |
| LP Rør AS | Construction | 2006 |
| Luca & Luce AS | Wholesale & retail | 2025 |
| Lumi Invest AS | | 2020 |
| Lumimind AS | | 2010 |