| Karlander Eiendomsutvikling AS | Real estate | 2020 |
| Karlander Invest AS | Real estate | 1988 |
| Karlander Shipping Services AS | | 1949 |
| Karlandergården Da | Real estate | 1979 |
| Karlavägen AS | | 2025 |
| Karlberg Holding AS | | 2024 |
| Karls AS | Wholesale & retail | 1966 |
| Karlsen & Belkasmi AS | | 2019 |
| Karlsen & Thesen AS | Wholesale & retail | 2025 |
| Karlsen Consulting AS | Professional & scientific | 2019 |
| Karlseng Holding AS | Financial services | 2015 |
| Karlseng Invest AS | Manufacturing | 2013 |
| Karlsens Vaktmestertjeneste AS | Administrative & support | 2011 |
| Karlshus Bruk Eiendom AS | Real estate | 1998 |
| Karlsrud Holding AS | | 2022 |
| Karlsrud Mat Og Vin AS | Hospitality | 2013 |
| Karlsrud Næringstomt AS | | 2025 |
| Karlsrud Rør AS | Construction | 1985 |
| Karlsrud Sentrum AS | Real estate | 2015 |
| Karlsrud Tomteselskap AS | | 2025 |
| Karlsson & Svensson Projekt Norge Nuf | Professional & scientific | 2009 |
| Karlsson Barlindhaug AS | Other services | 2011 |
| Karlsson Holding AS | Professional & scientific | 2022 |
| Karlstadsgaten 11 AS | Real estate | 2007 |
| Karlsvogn AS | Professional & scientific | 2025 |
| Karlsvogna AS | Real estate | 2025 |
| Karlwood Ltd | Manufacturing | 2012 |
| Karma AS | Real estate | 1998 |
| Karma Beauty | Other services | 2021 |
| Karma Eiendom AS | | 2005 |
| Karma Invest AS | | 2022 |
| Karma På Hjørnet AS | Other services | 2022 |
| Karmakontoret AS | Professional & scientific | 2003 |
| Karmasol & Partners AS | Financial services | 1987 |
| Karmell AS | Professional & scientific | 2020 |
| Karmoie AS | Wholesale & retail | 2010 |
| Karne Invest AS | | 2021 |
| Karnov Group Norway AS | Arts & recreation | 2019 |
| Karnu Holding AS | | 2022 |
| Karo Holding AS | Real estate | 2019 |
| Karo Pharma AS | Wholesale & retail | 1940 |
| Karoline Amb AS | Arts & recreation | 2022 |
| Karoline Bondø Haug AS | Professional & scientific | 2024 |
| Karoline Eggens Vei 3 AS | Real estate | 2007 |
| Karoline Steen Invest AS | Real estate | 2015 |
| Karoline Storbråten AS | | 2023 |
| Karolol AS | Financial services | 2017 |
| Karpal AS | Wholesale & retail | 2012 |
| Karpal Eiendom AS | Real estate | 2017 |
| Karpe Diem AS | Arts & recreation | 2010 |
| Karpe Holding AS | Real estate | 2020 |
| Karpinsky Oil & Gas Company AS | Mining & quarrying | 1997 |
| Karpov Solutions AS | | 2020 |
| Karpuzi Snekker Og Dekoratør AS | Construction | 2011 |
| Karrierehuset AS | Information & communication | 2002 |
| Karrieresenteret AS | Administrative & support | 2022 |
| Karrieretorget.No AS | Information & communication | 2023 |
| Kars AS | Professional & scientific | 2018 |
| Karsrud Invest AS | | 2024 |
| Karsten Holding AS | Administrative & support | 2022 |
| Karstensen Holding AS | Information & communication | 2017 |
| Karstensens AS | Professional & scientific | 2015 |
| Kart Invest AS | | 2009 |
| Kartago AS | Transport & logistics | 2026 |
| Kartago Holding AS | | 2026 |
| Kartkonsult Per Fosser AS | Manufacturing | 2012 |
| Karto AS | | 2004 |
| Kartveit & Heggøy Brannsikkerhet AS | Professional & scientific | 2017 |
| Karud Holding AS | | 2025 |
| Karunya AS | | 2025 |
| Karus Ans | Wholesale & retail | 1992 |
| Karus AS | Information & communication | 2018 |
| Karusveien 19 AS | Real estate | 2014 |
| Karvesvingen 2 AS | Real estate | 2009 |
| Karvesvingen 3 AS | Real estate | 2009 |
| Karvesvingen 3 Eiendom AS | Real estate | 2025 |
| Karvesvingen 5 AS | Real estate | 2012 |
| Karvesvingen 5 Eiendomsfond AS | Financial services | 2019 |
| Karvesvingen 5 Eiendomsinvest AS | Real estate | 2020 |
| Karvesvingen 7 AS | Real estate | 2009 |
| Karviland AS | Information & communication | 2006 |
| Karwendel AS | Professional & scientific | 2019 |
| Karya AS | Professional & scientific | 2026 |
| Kas Company AS | Professional & scientific | 2009 |
| Kas Eiendom AS | Real estate | 2020 |
| Kas Hjula Holding AS | | 2021 |
| Kas Holding AS | | 2019 |
| Kas Invest AS | | 2022 |
| Kasado 2020 AS | | 2020 |
| Kasai AS | Hospitality | 2024 |
| Kasberg AS | | 2016 |
| Kasberg Invest AS | | 2024 |
| Kasco Invest AS | Real estate | 2002 |
| Kase Kapital AS | | 2025 |
| Kasesam AS | Hospitality | 2005 |
| Kashani Holding AS | Administrative & support | 2014 |
| Kashin AS | Professional & scientific | 2023 |
| Kashmir Transport AS | Transport & logistics | 2021 |
| Kasin Holding AS | Professional & scientific | 2006 |
| Kasjmirene AS | | 2023 |