| Keiko AS | Financial services | 2015 |
| Keikol Holding AS | Real estate | 2017 |
| Kejt AS | Real estate | 1994 |
| Keklolwtf AS | Information & communication | 2014 |
| Keller CMS AS | Wholesale & retail | 2020 |
| Kello AS | Professional & scientific | 2004 |
| Kemax Økonomi AS | Professional & scientific | 1988 |
| Kemax Økonomi Regnskap AS | Professional & scientific | 1990 |
| Kememo Corporate AS | Professional & scientific | 2009 |
| Kenda Eiendom AS | Real estate | 2012 |
| Kentlands Holdning AS | Health & social care | 2023 |
| Kepler Holding AS | | 2022 |
| Kerko Eiendom AS | Real estate | 2023 |
| Kerko Process AS | Transport & logistics | 2018 |
| Kerko Shipping AS | Real estate | 2008 |
| Kermit Eiendom AS | Real estate | 1988 |
| Kero Dale AS | Construction | 1997 |
| Kero Eiendom AS | Real estate | 2005 |
| Kero Gården AS | Real estate | 2009 |
| Kes Invest AS | Administrative & support | 2006 |
| Kesmic AS | Health & social care | 2021 |
| Kestrion Shield AS | Professional & scientific | 2026 |
| Kex AS | Professional & scientific | 2019 |
| Key Ocean AS | Transport & logistics | 2024 |
| Key Shipping AS | Administrative & support | 2007 |
| Key Tankers AS | Administrative & support | 2014 |
| Key-Tech AS | Information & communication | 2023 |
| Keysers 6 AS | Real estate | 2018 |
| Keysers 8 AS | Real estate | 2018 |
| Kfkb Invest AS | Hospitality | 2013 |
| KFS Consulting AS | Professional & scientific | 2022 |
| Kge Bergen AS | | 2025 |
| KGJ Bulk Holding AS | Transport & logistics | 2009 |
| KGJ Cement Holding AS | Transport & logistics | 2004 |
| KGS Holding AS | | 2022 |
| Kha AS | | 2025 |
| Khalifa Bilutleie AS | Administrative & support | 2023 |
| Khalifa Transport AS | Transport & logistics | 2020 |
| Khan Holding AS | Real estate | 2005 |
| KHK Eiendom AS | Real estate | 2018 |
| Khvh Holding AS | Hospitality | 2019 |
| Kickstart Management Og Artistbooking AS | Professional & scientific | 2016 |
| Kidcube AS | Wholesale & retail | 2024 |
| Kidsa Barnehager AS | Education | 2010 |
| Kig Entertainment Nuf | Arts & recreation | 2008 |
| Kiip AS | Professional & scientific | 2021 |
| Kiko AS | Hospitality | 2026 |
| Kilevink AS | Financial services | 2012 |
| Kiloxtrot AS | Professional & scientific | 2020 |
| Kim La AS | Wholesale & retail | 2026 |
| Kime Arkitektur Og Landskap AS | Professional & scientific | 2023 |
| Kime AS | Real estate | 1997 |
| Kims AS | Hospitality | 2021 |
| Kind Conceptual Branding AS | Professional & scientific | 2013 |
| Kine Invest AS | Financial services | 2008 |
| Kinect Energy AS | Energy | 1991 |
| Kinect Energy Green Services AS | Energy | 2004 |
| Kinect Energy Markets AS | Energy | 2010 |
| Kinect Energy Spot AS | Energy | 1996 |
| King Oscar AS | Manufacturing | 2009 |
| Kings of Convenience Da | Arts & recreation | 2005 |
| Kinn Therapeutics AS | Professional & scientific | 2004 |
| Kinnva AS | Professional & scientific | 2019 |
| Kinotech AS | Wholesale & retail | 2022 |
| Kinotech Seating AS | Wholesale & retail | 2024 |
| Kinovasjon Norge AS | Professional & scientific | 1990 |
| Kinsarvik Naturkost Vest AS | Wholesale & retail | 2016 |
| Kintama Da | Arts & recreation | 2007 |
| Kioskdrift Muzepper AS | Wholesale & retail | 2024 |
| Kioskdrift Wenche Brommeland AS | Wholesale & retail | 2024 |
| Kipo 17 AS | Real estate | 2019 |
| Kirkegate 43 a AS | Real estate | 2009 |
| Kirkegaten 166 AS | Real estate | 2007 |
| Kirkegaten 17 AS | Real estate | 2008 |
| Kirkegaten 1C AS | Real estate | 2025 |
| Kirkeli Eiendom AS | Real estate | 2025 |
| Kirketomten AS | Real estate | 2018 |
| Kirkeveien 50 AS | Real estate | 2019 |
| Kirkeveien Eiendom AS | Real estate | 2013 |
| Kiroby Holdningselskap AS | | 2022 |
| Kiropraktor Nils Meier AS | Health & social care | 2022 |
| Kirurgi Vest AS | Health & social care | 2014 |
| Kiseldur Invest AS | Real estate | 2017 |
| Kismul Invest AS | | 2025 |
| Kitebrook AS | Information & communication | 2016 |
| Kitebrook Core AS | Information & communication | 2026 |
| Kitebrook Nexus AS | Information & communication | 2026 |
| Kitebrook Vector AS | Information & communication | 2026 |
| Kitos Light AS | Wholesale & retail | 2021 |
| KIVU97 AS | | 2023 |
| Kjell Kalleklev Management AS | Professional & scientific | 2010 |
| Kjell Røssang & Co | Wholesale & retail | 1980 |
| Kjellermester AS | Information & communication | 2025 |
| Kjellersmuget 16 AS | Real estate | 2005 |
| Kjelstrup Olsen Eiendom AS | Real estate | 1980 |
| Kjema AS | Construction | 2005 |
| Kjema Invest AS | | 2024 |
| Kjer Tho Invest AS | Real estate | 2025 |
| Kjerstin+Steinar Jensen Fotografene Ans | Professional & scientific | 1995 |
| Kjerstis Hudpleiesalong AS | Other services | 1992 |