| Jorkarl AS | | 2025 |
| Jortveits Holding AS | Financial services | 2017 |
| Joviinvest AS | Real estate | 2021 |
| Jrs-As | Health & social care | 2011 |
| Jruud AS | Information & communication | 2019 |
| Jsu Holding AS | Information & communication | 2024 |
| Jsu Literary Services AS | Information & communication | 2024 |
| Jta AS | Real estate | 2007 |
| Jugaard AS | | 2023 |
| K Hartwall OY AB | Wholesale & retail | 2001 |
| K Lindberg Consulting AS | Professional & scientific | 2026 |
| K Promotion AS | Professional & scientific | 2012 |
| Kalas AS | Real estate | 2016 |
| Karihdesign AS | | 2005 |
| Kasp Invest AS | | 2022 |
| Kbalk Holding AS | | 2024 |
| Kbkolaas AS | | 2021 |
| Kebaks AS | Financial services | 2013 |
| KG Fitzpatrick AS | Professional & scientific | 2017 |
| KGM Holding AS | Financial services | 2005 |
| Ki-Tech Global AS | Construction | 2019 |
| Kibvik AS | Financial services | 2005 |
| Kirkeveien 53 AS | Real estate | 2011 |
| Kjartan AS | Financial services | 2005 |
| Kjeks AS | Real estate | 2005 |
| Klingenberg Pro AS | Professional & scientific | 2024 |
| Kloppedalen AS | Professional & scientific | 2002 |
| Klub Cajac AS | | 2018 |
| KM Energy AS | Professional & scientific | 2006 |
| KMH HLD AS | Real estate | 2015 |
| KMH Holding AS | | 2021 |
| Knis Invest AS | Wholesale & retail | 2019 |
| KNM Holding AS | Financial services | 2018 |
| Knu Bygg Og Renovering AS | Construction | 2019 |
| Kolflaath Eiendom AS | Real estate | 2005 |
| Kommunikasjonsservice AS | Wholesale & retail | 1995 |
| Kompetanse Akademiet AS | Education | 2020 |
| Konsolis AS | | 2024 |
| Kordis AS | Health & social care | 2023 |
| Kordis Holding AS | Health & social care | 2022 |
| Koroman AS | Information & communication | 2020 |
| Koska Invest AS | | 2025 |
| Kostervåg AS | | 2022 |
| Kosvig Utvikling AS | | 2009 |
| KR Maskinlag Da | Administrative & support | 2017 |
| Kramer Rør AS | Construction | 2019 |
| KRG Holding AS | Financial services | 2005 |
| Krimar Holding AS | Financial services | 2013 |
| Kristian Augusts Gate 7 B AS | Real estate | 2025 |
| Kristian Ivs Gate 13 AS | Real estate | 2006 |
| Kristian Ivs Gate 15 AS | Real estate | 2007 |
| Kristiansen Group AS | Construction | 2020 |
| Kriton AS | | 2026 |
| Krouli AS | Information & communication | 2020 |
| Kulakowski AS | Professional & scientific | 2020 |
| Kuve AS | Arts & recreation | 2011 |
| Kuve Holding AS | Arts & recreation | 2021 |
| Kvaleid Shipping AS | Transport & logistics | 1996 |
| Kvaltem AS | Administrative & support | 2022 |
| Kvass Consulting AS | Construction | 2019 |
| L-E Olsson El AB | Construction | 2005 |
| La Vetta Boligstyling AS | Professional & scientific | 2015 |
| La Vetta Holding AS | Real estate | 2016 |
| Lak AS | Real estate | 2022 |
| Laleh AS | Wholesale & retail | 2024 |
| Landi AS | | 2019 |
| Landsbyarkitektene AS | Professional & scientific | 2001 |
| Landøyveien 5 Holding AS | Real estate | 2019 |
| Landøyveien 5A AS | Real estate | 2016 |
| Langbakken 18 Invest AS | Real estate | 2017 |
| Lapsang AS | | 2005 |
| Launch AS | Information & communication | 2013 |
| Lauvind AS | | 2024 |
| LBG Holding AS | | 2020 |
| LCK Invest AS | Real estate | 2016 |
| Lean Venture AS | | 2005 |
| Leangveien 58 AS | Real estate | 2017 |
| Learnio AS | Information & communication | 2020 |
| Learnio Social Enterprise AS | Education | 2025 |
| Leaseco AS | | 2024 |
| Lev Lurt AS | Financial services | 2005 |
| Lgeno AS | Construction | 2026 |
| Liestøl Enterprises Holding AS | Financial services | 2017 |
| Lifa Consulting AS | Professional & scientific | 2017 |
| Lifdi AS | | 2016 |
| Lille Bang AS | Hospitality | 2025 |
| Lille Høvik AS | Real estate | 2006 |
| Lillevann Eiendom AS | Real estate | 2018 |
| Lillevannsveien 72 AS | Real estate | 2018 |
| Lilling AS | Real estate | 2011 |
| Lindblad Invest AS | | 2021 |
| Lindegaard Familiebarnehage AS | Education | 2022 |
| Lindholt Holding AS | Financial services | 2012 |
| Lindner AG | Construction | 1997 |
| Lindvard Invest AS | | 2005 |
| Linum Invest AS | Financial services | 2000 |
| Listuen Holding AS | Professional & scientific | 2007 |
| Livmal Holding AS | | 2024 |
| Ljki Invest AS | | 2024 |
| LKS Capital AS | | 2019 |