| Ka Drift AS | Wholesale & retail | 2021 |
| Ka Invest & Styre AS | | 2025 |
| Ka Klinikken AS | Health & social care | 2007 |
| Ka Labs AS | Information & communication | 2026 |
| Ka Medical AS | Wholesale & retail | 2005 |
| Ka Olssøn Holding AS | Information & communication | 2022 |
| Ka Park AS | Real estate | 2018 |
| Ka Production AS | Education | 2012 |
| Ka'Ay AS | Wholesale & retail | 2025 |
| Ka-Vi-Ge AS | Real estate | 1989 |
| KA14 Holding AS | Information & communication | 2017 |
| KA14 Invest AS | Information & communication | 2017 |
| KA7 Holding AS | Real estate | 2020 |
| Kaa AS | Education | 2007 |
| Kaahpay AS | | 2011 |
| Kaanerud Invest AS | | 2024 |
| Kaao AS | | 2023 |
| Kaap Import AS | Wholesale & retail | 2026 |
| Kaapberger Ventures AS | Professional & scientific | 2010 |
| Kaapstad Invest AS | | 2021 |
| Kaare a. Rustad Eiendom AS | Real estate | 2005 |
| Kaare Berntsen Antikviteter AS | Wholesale & retail | 1907 |
| Kaare Lund Agenturer AS | Wholesale & retail | 2011 |
| Kaaresdatter Og Baldetorp AS | Wholesale & retail | 2019 |
| Kaarstad Invest AS | Professional & scientific | 2021 |
| Kaarstad Smier AS | Financial services | 2020 |
| Kaarstein Utvikling AS | Real estate | 2022 |
| Kaarud AS | Construction | 2014 |
| Kaarud Invest AS | Administrative & support | 2022 |
| Kaasa AS | Construction | 1989 |
| Kaasa Eiendom AS | Real estate | 1976 |
| Kaasa Holding AS | Construction | 2005 |
| Kab Holding Oslo AS | | 2020 |
| Kaba Taxi AS | Transport & logistics | 2026 |
| Kabak Invest AS | Financial services | 1997 |
| Kabal Design AS | Professional & scientific | 2025 |
| Kabara Invest AS | | 2021 |
| Kabaw Trading AB | Information & communication | 2019 |
| Kabbecross AS | | 2024 |
| Kabel TV Notodden AS | Information & communication | 1996 |
| Kabelgata 10 AS | Real estate | 2007 |
| Kabelgata 8 Eiendomsinvest AS | Real estate | 2020 |
| Kabelgaten 22-24 Hjemmel AS | Real estate | 2005 |
| Kabelgaten 32-40 AS | Real estate | 2021 |
| Kabelgaten 6 AS | Real estate | 2006 |
| Kabelgaten Holding AS | Real estate | 2016 |
| Kabesi Invest AS | | 2021 |
| Kabo AS | Health & social care | 2025 |
| Kabsa AS | Hospitality | 2024 |
| Kabuso AS | Real estate | 2007 |
| Kacabu AS | | 2025 |
| Kaccao AS | Financial services | 2010 |
| Kachta Invest AS | Real estate | 2021 |
| Kad Designs AS | Professional & scientific | 2018 |
| Kad-Invest AS | Professional & scientific | 2005 |
| Kada Studio AS | Professional & scientific | 2020 |
| Kader Kader AS | Information & communication | 2025 |
| Kadetten Festival AS | Arts & recreation | 2021 |
| Kadim Holding AS | | 2022 |
| Kadra AS | | 2019 |
| Kaduna AS | Wholesale & retail | 2005 |
| Kae Consultants Ans | Education | 1992 |
| Kae Invest AS | Professional & scientific | 2012 |
| Kaele AS | Information & communication | 1998 |
| Kaera AS | Agriculture & fishing | 2013 |
| Kaerma AS | Wholesale & retail | 2017 |
| Kaes Invest AS | Financial services | 2010 |
| Kaf Invest AS | Administrative & support | 2012 |
| Kafe Celsius AS | Hospitality | 2013 |
| Kafe Vigeland AS | Hospitality | 1999 |
| Kafe-Kontoret AS | Hospitality | 2021 |
| Kafeko AS | Wholesale & retail | 2009 |
| Kafeteria August AS | Hospitality | 2023 |
| Kaffa AS | Manufacturing | 2005 |
| Kaffe & Brød Disen AS | Hospitality | 2008 |
| Kaffe & Krydder AS | Wholesale & retail | 2019 |
| Kaffe Norge Holding AS | Wholesale & retail | 2021 |
| Kaffebakeriet AS | Manufacturing | 2000 |
| Kaffebrenneriet AS | Hospitality | 1994 |
| Kaffefuglen AS | Hospitality | 1962 |
| Kaffeknappen Norge AS | Wholesale & retail | 2018 |
| Kaffekort AS | | 2026 |
| Kaffeslabber AS | Information & communication | 2024 |
| Kaffetårnet AS | Real estate | 2022 |
| Kafifoss AS | Financial services | 2015 |
| Kafk Consulting AS | Professional & scientific | 2026 |
| Kafo Limited AS | Manufacturing | 2017 |
| Kafrem AS | Wholesale & retail | 1996 |
| Kafs Holding AS | | 2024 |
| Kafé 5 Hjerter AS | Hospitality | 2014 |
| Kafé Hærverk AS | Hospitality | 2017 |
| Kag AS | Financial services | 2005 |
| Kag Holding AS | Construction | 2007 |
| KAG7 AS | Real estate | 2014 |
| Kagge AS | Real estate | 1997 |
| Kagge Eiendom AS | Real estate | 2019 |
| Kagge Forlag AS | Information & communication | 1996 |
| Kagge Holding AS | | 2026 |
| Kaggen Invest AS | | 2005 |
| Kahala Holding AS | | 2008 |