| Kopera AS | Professional & scientific | 2016 |
| Kopera Services AS | Information & communication | 2022 |
| Koppholen 20 AS | Real estate | 2001 |
| Koppholen 23 AS | Real estate | 2008 |
| Koppholen 23 Holding AS | Real estate | 2014 |
| Koppholen AS | Real estate | 2022 |
| Kordelen AS | Education | 2016 |
| Koren Holding AS | | 2019 |
| Kork AS | Financial services | 2010 |
| Korkeken AS | Real estate | 2017 |
| Korrekt Bygg AS | Construction | 2025 |
| Kosmu AS | Professional & scientific | 2014 |
| Kost & Fitness AS | Wholesale & retail | 2007 |
| KOST1 Kosttilskudd AS | Wholesale & retail | 2010 |
| Kostrzewa AS | Real estate | 2026 |
| Kota Holding AS | Professional & scientific | 2010 |
| Kotech AS | Real estate | 2005 |
| Kotech Utleie AS | Hospitality | 2024 |
| Kozeriet AS | Hospitality | 2014 |
| Koziel Holding AS | | 2023 |
| KP Investering AS | Real estate | 2012 |
| Kpettersen Holding AS | Information & communication | 2017 |
| KR Solutions AS | Administrative & support | 2015 |
| KRABBEN13 AS | | 2025 |
| Kraft Dialog AS | Administrative & support | 2011 |
| Kraftklinikken AS | Education | 2017 |
| Kragget AS | | 2021 |
| Kramann AS | Financial services | 2005 |
| Kranglefanten AS | Hospitality | 2016 |
| Kre Eiendom AS | Real estate | 1980 |
| Kre Invest AS | Real estate | 2005 |
| Krea Invest AS | Real estate | 2006 |
| Kream AS | Professional & scientific | 2015 |
| Kreativ Sperre AS | | 2024 |
| Kreativt Fakultet Eiendom AS | | 2003 |
| Krentak AS | Real estate | 1982 |
| Kreyco Holding AS | | 2024 |
| Krifo AS | Professional & scientific | 2020 |
| Krili AS | Real estate | 2014 |
| Krima Helse AS | Health & social care | 2021 |
| Krims Investment AS | Financial services | 2007 |
| Kring AS | Professional & scientific | 2018 |
| Kris Og Conrad AS | Professional & scientific | 2017 |
| Krishna AS | Wholesale & retail | 2013 |
| Kristen Friskole AS | Education | 2012 |
| Kristian a Invest AS | | 2025 |
| Kristian Falnes AS | | 2025 |
| Kristian Rygh AS | Professional & scientific | 2006 |
| Kristian Surdal Bygg & Eiendom AS | Construction | 2026 |
| Kristians and AS | Wholesale & retail | 2005 |
| Kristiansen Motorsport Service AS | Wholesale & retail | 2019 |
| Kristine Josefsen AS | Wholesale & retail | 2025 |
| Kristvika Næringspark AS | Real estate | 2010 |
| Krivis AS | Professional & scientific | 2019 |
| KRJ Eiendom AS | Health & social care | 2010 |
| Krogstadmo AS | Wholesale & retail | 2022 |
| Krohnå AS | | 2025 |
| Krohnåsveien Eiendom AS | Real estate | 2006 |
| Krokodille Invest AS | Professional & scientific | 2008 |
| Krokåsveien AS | Real estate | 2020 |
| Kronen Bolig AS | | 2012 |
| Kronen Finans AS | Administrative & support | 2020 |
| Kronen Forsikring AS | Financial services | 2015 |
| Kronen Kaffemaskiner AS | Wholesale & retail | 2025 |
| Kronen Kaffemaskiner Holding AS | Wholesale & retail | 2025 |
| Kronen Partners AS | Financial services | 2017 |
| Krono AS | Information & communication | 2026 |
| Kropp Og Sjel Stavanger Ans | Health & social care | 2008 |
| Krossgata 26 AS | Real estate | 2024 |
| Krossgata 3 AS | Real estate | 2021 |
| Krug Consulting AS | Professional & scientific | 2017 |
| Krugman Invest Da | Financial services | 2008 |
| Kryptovault AS | Information & communication | 2023 |
| KS AS Skagen Hotellbygg | Administrative & support | 1986 |
| Ks-Lab AS | Manufacturing | 2026 |
| Ksab Invest AS | | 2023 |
| Kse Holding AS | Financial services | 2014 |
| Ksi Holding AS | Professional & scientific | 2010 |
| KSL Eiendom AS | Real estate | 2026 |
| Ksol Invest AS | Information & communication | 2013 |
| Ksturøy Holding AS | | 2022 |
| Ksub AS | Information & communication | 2019 |
| KSV Solutions AS | Information & communication | 2008 |
| KT Ventilasjon AS | Construction | 2026 |
| Ktveita AS | Professional & scientific | 2024 |
| Kudos Family AS | Information & communication | 2008 |
| Kuling Vannbehandling AS | Professional & scientific | 2020 |
| Kull AS | Wholesale & retail | 2010 |
| Kull Sentrum AS | Wholesale & retail | 2026 |
| Kulle Invest AS | Financial services | 2007 |
| Kullkaien AS | Real estate | 1986 |
| Kulsrud Invest AS | | 2019 |
| Kultur & Kos AS | Professional & scientific | 2020 |
| Kulturkompaniet AS | Administrative & support | 2025 |
| Kulturkompaniet Holding AS | | 2025 |
| Kulturkompaniet Topco AS | | 2025 |
| Kulør Design AS | Professional & scientific | 2024 |
| Kulør Holding AS | Professional & scientific | 2024 |
| Kun-Emas Norge AS | Professional & scientific | 2024 |
| Kunde Dialog Ans | Information & communication | 1995 |