| Kaldera Språkteknologi AS | Information & communication | 2007 |
| Kaldheim AS | | 2017 |
| Kaldhussæters Helsetjenester AS | Education | 2023 |
| Kaldis AS | Hospitality | 2022 |
| Kaldnes K1 AS | Real estate | 2008 |
| Kaldnes Park AS | Real estate | 2003 |
| Kaledo AS | Professional & scientific | 2022 |
| Kaleidoskop Holding AS | Information & communication | 2023 |
| Kaleroa AS | | 2026 |
| Kalfarveien 31 AS | Real estate | 2014 |
| Kali Kapital AS | | 2020 |
| Kali Magic Da | Wholesale & retail | 2009 |
| Kaliber Gruppen AS | Professional & scientific | 2020 |
| Kaliber IT AS | Information & communication | 2017 |
| Kalibera AS | Information & communication | 2008 |
| Kalifornien AS | Hospitality | 2025 |
| Kalin AS | Professional & scientific | 1991 |
| Kalisi Group AS | Wholesale & retail | 2026 |
| Kalkbyen 1 Bolig AS | Real estate | 2025 |
| Kalkbyen 2 Bolig AS | | 2025 |
| Kalkbyen 3 Bolig AS | | 2025 |
| Kalkbyen 4 Bolig AS | Real estate | 2025 |
| Kalkbyen 5 Bolig AS | | 2025 |
| Kalkbyen 6 Bolig AS | Real estate | 2025 |
| Kalkbyen Holding AS | | 2017 |
| Kalkhuset AS | Real estate | 2016 |
| Kalkinn AS | Real estate | 2005 |
| Kalklavkraft AS | Energy | 2015 |
| Kalle Invest AS | Financial services | 2005 |
| Kalle Kula AS | | 2022 |
| Kalle Og Co AS | Wholesale & retail | 2026 |
| Kalleberg Invest Holding AS | Wholesale & retail | 2023 |
| Kallevig Invest AS | | 2020 |
| Kalligrafi Ans | | 1993 |
| Kallio Dalseng Consulting AS | Professional & scientific | 2026 |
| Kalljo AS | Information & communication | 2015 |
| Kallsup Invest AS | | 2019 |
| Kallåk Energi Service AS | Construction | 2019 |
| Kalma AS | | 2026 |
| Kalma Foods AS | Wholesale & retail | 2024 |
| Kalo Invest AS | | 2023 |
| Kalom AS | | 2020 |
| Kalora AS | Administrative & support | 1997 |
| Kalorama AS | Professional & scientific | 2013 |
| Kalos Information Systems AS | Information & communication | 2017 |
| Kaloshi AS | Wholesale & retail | 2020 |
| Kaloshi Invest AS | Information & communication | 2024 |
| Kalseth Technology AS | Information & communication | 2020 |
| Kalt Holding AS | | 2024 |
| Kaluna Nordic AS | Professional & scientific | 2011 |
| Kaluza Media AS | Arts & recreation | 2013 |
| Kalveløkka Båtbrygge SA | Other services | 1971 |
| Kalvetangen 91 AS | Real estate | 2008 |
| Kalvåhøgdi AS | Financial services | 2005 |
| Kam Bislett AS | Other services | 2025 |
| Kam Furuset AS | Other services | 2023 |
| Kam Holding AS | Agriculture & fishing | 2000 |
| Kam Løkka AS | Other services | 2025 |
| Kam Norge AS | Other services | 2021 |
| Kam Nydalen AS | Other services | 2023 |
| KAM2 AS | Other services | 2025 |
| KAM7 AS | Other services | 2026 |
| Kamabo Invest AS | Real estate | 2004 |
| Kamada Invest AS | Real estate | 2015 |
| Kamami AS | | 2022 |
| Kaman Kulturbyå AS | Professional & scientific | 2016 |
| Kamato AS | Professional & scientific | 2005 |
| Kamawasa AS | Real estate | 2020 |
| Kamay Sushi AS | Hospitality | 2025 |
| Kamben Consulting AS | Information & communication | 2025 |
| Kamberg Invest AS | Professional & scientific | 2019 |
| Kambo Næringspark AS | Real estate | 2024 |
| Kambo Utvikling AS | Real estate | 2023 |
| Kamel AS | Real estate | 2017 |
| KAMEL555 Holding AS | Education | 2022 |
| Kameleon AS | | 2022 |
| Kamelia Eiendom AS | Real estate | 1996 |
| Kamelon AS | Professional & scientific | 2015 |
| Kameo AS | Administrative & support | 2014 |
| Kameo Investment Platform AB Nuf | Financial services | 2023 |
| Kamerado AS | Health & social care | 2022 |
| Kameragaard AS | Information & communication | 2013 |
| Kamerakameratene AS | Information & communication | 1992 |
| Kamerat AS | Hospitality | 2023 |
| Kamerautleien AS | Administrative & support | 2005 |
| Kamf Adventures AS | Real estate | 2017 |
| Kamfjord Tannlege AS | Health & social care | 2019 |
| Kamic Invest AS | | 2024 |
| Kamic No AS | Wholesale & retail | 1984 |
| Kamikaze Invest AS | Construction | 2021 |
| Kamil Grill AS | Hospitality | 2022 |
| Kamilla Pof AS | | 2024 |
| Kamilla Sunde Nymark AS | Professional & scientific | 2025 |
| Kamille Holding AS | Health & social care | 2005 |
| Kamille Textile AS | Professional & scientific | 2015 |
| Kamillionaire AS | | 2022 |
| Kamirii AS | Wholesale & retail | 2025 |
| Kamma AS | Financial services | 2005 |
| Kammer Eiendom AS | Real estate | 1987 |
| Kammerherreløkka 3 & 5 AS | Real estate | 2007 |