| Joelsen Invest AS | Real estate | 2021 |
| Johs Hansen Skip AS | Transport & logistics | 1997 |
| Johs. Hansen & Co AS | Real estate | 1930 |
| Johs. Hansen Eiendom AS | Real estate | 1966 |
| Johs. Hansen Eiendom Sandvika AS | Real estate | 2012 |
| Johs. Hansen Holding AS | | 2025 |
| Johs. Hansen Management AS | Professional & scientific | 2020 |
| Johs.Hansen Familie AS | Financial services | 2007 |
| Joinvest AS | Professional & scientific | 2005 |
| Jones Eiendom Ans | Real estate | 1975 |
| Jongskollen Terrasse AS | Real estate | 2002 |
| Jonna Ek AS | | 2022 |
| Jotto AS | | 2005 |
| Jpi AS | Financial services | 2008 |
| JR Capella Invest AS | Real estate | 2017 |
| Justinian AS | Information & communication | 2018 |
| Ka Auto AS | Wholesale & retail | 2024 |
| Kajsas AS | Hospitality | 2012 |
| Kaliboat & Lofoten Alpineguides AS | Administrative & support | 2024 |
| Kalk Eiendom AS | Real estate | 2000 |
| Kamil Bygg AS | Construction | 2020 |
| Kamul AS | | 2024 |
| Kand Goods Ans | Professional & scientific | 1995 |
| Kanel Bakeries Salg AS | Hospitality | 2012 |
| Kap-Mar Bygg AS | Construction | 2015 |
| Karmag Invest AS | | 2023 |
| Kasama Studio AS | Other services | 2018 |
| Kazegroup AS | Education | 2015 |
| KB Gundersen AS | Financial services | 2011 |
| Kcu Invest AS | | 2005 |
| Kelvin AS | Wholesale & retail | 1993 |
| KGB Dans & Ballett AS | Education | 1998 |
| Khachatrjan Holding AS | | 2026 |
| Kid Astray Da | Arts & recreation | 2013 |
| Kiellands Services AS | Transport & logistics | 2015 |
| Kimber Holding AS | | 2025 |
| King City AS | Hospitality | 1994 |
| Kinor Digitek AS | Professional & scientific | 2016 |
| Kinsarvik Naturkost AS | Wholesale & retail | 2000 |
| Kirkeveien 62 Og 64 AS | Real estate | 2013 |
| Kirkeveien 71 Energi AS | Energy | 2011 |
| Kirkeveien 71 Sameie | Households | 2013 |
| Kirneh Invest AS | | 2024 |
| Kiropraktor Vivienne Locke AS | Health & social care | 2012 |
| Kjell & Co Norway AS | Wholesale & retail | 2015 |
| Kjellsen AS | Wholesale & retail | 2010 |
| Kjemo AS | Health & social care | 1988 |
| Kjøkkensikring AS | Other services | 2025 |
| Kjør Meg/Drive Me AS | Transport & logistics | 2025 |
| Kjørbo Event AS | Real estate | 2024 |
| Kjørbokollen Kontorbygg AS | Real estate | 1981 |
| Kka 543 Holding AS | | 2023 |
| KKJ Investments AS | | 2025 |
| Klinikk Pluss AS | Health & social care | 1984 |
| Klipco AS | Real estate | 2013 |
| Knowhow Media AS | Professional & scientific | 1986 |
| Knudsiansen Services AS | Information & communication | 2012 |
| Kobbernaglen AS | Real estate | 2006 |
| Kolbiss AS | Professional & scientific | 2024 |
| Konkoi AS | Health & social care | 2015 |
| Kople AS | Professional & scientific | 2021 |
| Kopperud Bygg Invest AS | Construction | 2012 |
| Kornelione Invest AS | | 2022 |
| KPG AS | | 2010 |
| Kr-Im AS | Professional & scientific | 2017 |
| Kramer Og Woloszyn Ans | Professional & scientific | 1991 |
| Kreativitetshuset AS | Education | 1997 |
| Kristian a AS | | 2018 |
| Kristian a II AS | | 2019 |
| Kristian Holding AS | | 2025 |
| Kristines Franske Fristelser AS | Manufacturing | 1998 |
| Kritt AS | Professional & scientific | 2017 |
| Kvant Cargo AS | Transport & logistics | 2026 |
| Kveim & Nordlund Da | Wholesale & retail | 2017 |
| Kvintessens AS | Education | 2010 |
| Kystbygg AS | Construction | 1990 |
| Kästle Norge AS | Professional & scientific | 2024 |
| LAB1 AS | Professional & scientific | 2007 |
| Lafam Invest AS | | 2023 |
| Lager Capital AS | | 2024 |
| Landa Consulting AS | Professional & scientific | 1998 |
| Landlord AS | Real estate | 2026 |
| Langefinne AS | Information & communication | 2011 |
| Lars Bakketun AS | Professional & scientific | 1997 |
| Larsen & Sprovin AS | Wholesale & retail | 2026 |
| Laserfowl AS | Manufacturing | 2018 |
| Laserklinikken Anne Harila UK Nuf | Health & social care | 2005 |
| Laura AS | Manufacturing | 2017 |
| LB4 Holding AS | Administrative & support | 2020 |
| Ldvt Energy Consult AS | Professional & scientific | 2023 |
| Ldvt Fjellhvil AS | Real estate | 2022 |
| Le Salon AS | Other services | 2025 |
| Lean Studio AS | Other services | 2015 |
| Leg Mode Da | Information & communication | 2022 |
| Legehjelp AS | Health & social care | 2018 |
| Legehjelp Drift AS | Health & social care | 2026 |
| Legespesialist Praksis AS | Health & social care | 2018 |
| Leif Aaberge Holding AS | Financial services | 2014 |
| Lena Hansson Design AS | Professional & scientific | 2021 |
| Less Trash AS | Wholesale & retail | 2013 |