| Kalas Og Canasta AS | Hospitality | 2005 |
| Kalkulus AS | Professional & scientific | 2022 |
| Kallemunken AS | | 2020 |
| Kalmargården Næringseiendom AS | Real estate | 2007 |
| Kalpro AS | Financial services | 2005 |
| Kals Holding AS | | 2024 |
| Kalvella AS | Real estate | 2005 |
| Kalvskinnet Legesenter Da | Health & social care | 1979 |
| Kalvskinnsgata 2 AS | Real estate | 2020 |
| Kalvøyveien 13 AS | Real estate | 1988 |
| Kamanjab Holding AS | Financial services | 2016 |
| Kamawi AS | Information & communication | 2024 |
| Kamc Holding AS | Real estate | 2020 |
| Kamc Holding II AS | Real estate | 2020 |
| Kameleon Oppussing AS | Information & communication | 2020 |
| Kamino Holding AS | | 2023 |
| Kamtor AS | | 2021 |
| Kamuflert AS | Financial services | 2018 |
| Kanalkai 19 SA | Real estate | 2024 |
| Kantega Sso AS | Information & communication | 2018 |
| Kap Consulting AS | Professional & scientific | 2023 |
| KAP24 AS | Wholesale & retail | 2018 |
| Kape Bemanning AS | Administrative & support | 2020 |
| Kapellanen Invest AS | | 2018 |
| Kapellveien 2 AS | Real estate | 2006 |
| Kaplak AS | Manufacturing | 1998 |
| Kapom Invest AS | | 2021 |
| Kaptein Nilsen AS | | 2026 |
| Kaptein Roosensvei 6 AS | Real estate | 2012 |
| Kar Consulting AS | Professional & scientific | 2007 |
| Kara Consulting AS | Information & communication | 2017 |
| Karakalpakis Familien AS | Wholesale & retail | 2024 |
| Karegg 230 Holding AS | | 2023 |
| Kari Wilhelmine Askelund Holding AS | Financial services | 2019 |
| Karianne Kleven AS | | 2025 |
| Karin Fevaag Larsen AS | Health & social care | 2005 |
| Karisvingen 4 AS | Real estate | 2020 |
| Karl Knudsen AS | Professional & scientific | 1996 |
| Karl-Ove Bjørnstad AS | Construction | 1994 |
| Karl-Ove Bjørnstad Eiendom AS | Real estate | 1975 |
| Karlsen Gruppen AS | Transport & logistics | 2018 |
| Karlsen Invest AS | | 2022 |
| Karlsen Transport Service AS | Transport & logistics | 2017 |
| Karo AS | Real estate | 1999 |
| Karrierevalg Norge AS | Professional & scientific | 1998 |
| Karsk Kreativ AS | Professional & scientific | 2023 |
| Karuna Holding AS | | 2022 |
| Karv Holding AS | | 2025 |
| Karve AS | Professional & scientific | 2025 |
| Kasa Invest 4DØTRE AS | Real estate | 2020 |
| Kasa Invest AS | Real estate | 2019 |
| Kasmax Holding AS | Real estate | 2012 |
| Kasomhelst AS | Manufacturing | 2023 |
| Kasparas AS | | 2024 |
| Kaspersen AS | Administrative & support | 2018 |
| Kaspo Holding AS | Wholesale & retail | 2000 |
| Kaspo Maskin AS | Wholesale & retail | 1990 |
| Kassasenter Midt-Norge AS | Wholesale & retail | 2014 |
| Kassh AS | | 2021 |
| Kastbrekka Eiendom AS | Real estate | 2005 |
| Kastor Invest AS | Arts & recreation | 2021 |
| Kastor Invest Holding AS | Arts & recreation | 2021 |
| Kasydra AS | Information & communication | 2014 |
| Kat-Holding AS | Financial services | 2014 |
| Katallasso AS | Real estate | 2021 |
| Kateter AS | Education | 2022 |
| Kathrin Sørensen Sneve AS | Health & social care | 2021 |
| Kating Holding AS | | 2025 |
| Katoider AS | Financial services | 2011 |
| Katometo Holding AS | Financial services | 2007 |
| Kattemskogen AS | Real estate | 2011 |
| Kauk Invest AS | Real estate | 2016 |
| Kaurle AS | | 2023 |
| Kavaro Møllenberg AS | Wholesale & retail | 2006 |
| Kavi Eiendom AS | Real estate | 2022 |
| Kavi Holding AS | Health & social care | 2022 |
| Kavli & Angvik Ans | Health & social care | 2006 |
| Kavs AS | Professional & scientific | 2018 |
| Kaza Kaza AS | | 2024 |
| Kaø Holding AS | | 2020 |
| KBT Fagskole AS | Education | 2019 |
| Kbø & SP Rådgivning AS | Financial services | 2022 |
| KD Legetjeneste AS | Health & social care | 2019 |
| Ke.Indahl AS | | 2024 |
| Kebabaluba AS | Hospitality | 2025 |
| Keda Eiendom AS | Real estate | 2006 |
| Keep Sportsfuel AS | Wholesale & retail | 2025 |
| Kefu Holding AS | Financial services | 2011 |
| Keiba AS | Manufacturing | 2005 |
| Keimon Medical AS | Professional & scientific | 2022 |
| Keiserens Nye Trær AS | Wholesale & retail | 2012 |
| Keiserås Rørservice AS | Construction | 2025 |
| Keiv AS | Real estate | 2014 |
| Kelpnest AS | Agriculture & fishing | 2023 |
| Kencha Byggservice AS | Construction | 2022 |
| Kencha Eiendom AS | Real estate | 2013 |
| Kencha Holding AS | Real estate | 2013 |
| Kencha Utvikling AS | Professional & scientific | 2014 |
| Kendo N AS | Hospitality | 2014 |
| Keni Holding AS | Manufacturing | 2014 |