| Kognitivklinikken AS | Health & social care | 2016 |
| Kognito AS | Health & social care | 2015 |
| Kogra AS | Real estate | 2017 |
| Kogstad Lunde & Co Da Advokatfirma Mna | Professional & scientific | 1999 |
| Koh AS | | 2022 |
| Koh Invest AS | | 2022 |
| Koh Tan Resort AS | Real estate | 2007 |
| Kohcom AS | Financial services | 2016 |
| Kohl AS | Real estate | 2019 |
| Koho Sales AS | Information & communication | 2024 |
| Koht Arkitekter AS | Professional & scientific | 2016 |
| Koi AS | Health & social care | 2005 |
| Koi Fargestudio AS | Professional & scientific | 2014 |
| Koi Sushi & Wok AS | Hospitality | 2021 |
| Koi Sushi AS | Hospitality | 2019 |
| Koie Løkka AS | Hospitality | 2024 |
| Koie Munch AS | Hospitality | 2018 |
| Koie Ramen AS | Hospitality | 2019 |
| Koie Torggata AS | Hospitality | 2017 |
| Koier Bygg AS | Construction | 2022 |
| Koin AS | Professional & scientific | 2017 |
| Kointi AS | Information & communication | 2022 |
| Koivunen Holding AS | Professional & scientific | 2022 |
| Kojessen Invest AS | | 2024 |
| Koji AS | | 2024 |
| Kok AS | Transport & logistics | 2017 |
| Kok Holding AS | | 2025 |
| Kok Oslo AS | Arts & recreation | 2019 |
| Kok Ventures AS | | 2019 |
| Kokai Consulting AS | Information & communication | 2020 |
| Kokk Og Gladgutt AS | Education | 2020 |
| Kokkcoop AS | Hospitality | 2015 |
| Kokkebutikken AS | Wholesale & retail | 2021 |
| Kokkeløren AS | Wholesale & retail | 2016 |
| Kokken Lars AS | Hospitality | 2013 |
| Kokken Tor Invest AS | | 2020 |
| Kokkeverden AS | Wholesale & retail | 2016 |
| Koko AS | | 2005 |
| Kokolis Invest AS | Real estate | 2015 |
| Kokoro AS | Wholesale & retail | 2026 |
| Kokos AS | | 2020 |
| Kokos Holding AS | | 2021 |
| Kokos Invest AS | | 2024 |
| Koksa Drift AS | Real estate | 1997 |
| Koksa Eiendom AS | Real estate | 2006 |
| Kokstad IL2 AS | Real estate | 2020 |
| Kokstad IL3 AS | Real estate | 2020 |
| Kokstad Næringstomt II AS | Real estate | 2020 |
| Kokstad Næringstomt III AS | Real estate | 2020 |
| Kokstad UTVIK1 AS | Real estate | 2020 |
| Kokstad UTVIK2 AS | Real estate | 2020 |
| Kokstaddalen 41 AS | Real estate | 2006 |
| Kokstadflaten Eiendomsinvest AS | Real estate | 2019 |
| Kokstadvegen 17 AS | Real estate | 2011 |
| Kokstadveien 31 a AS | Real estate | 2009 |
| Kokstadveien 40 AS | Real estate | 1975 |
| Kokstadveien Næringsbygg AS | Real estate | 2008 |
| Kol Kompetanse AS | Education | 2025 |
| Kolab Arkitekter AS | Professional & scientific | 2014 |
| Kolb Consulting AS | Professional & scientific | 2025 |
| Kolbe Invest AS | | 2020 |
| Kolbeinsen Holding AS | Professional & scientific | 2025 |
| Kolberg Gruppen AS | Real estate | 2022 |
| Kolberg Grødem AS | | 2025 |
| Kolberg Holding AS | Financial services | 1972 |
| Kolberg Motors AS | Real estate | 1966 |
| Kolbjørnsen & Rustad Da | Professional & scientific | 1994 |
| Kolbotn Eiendom AS | Real estate | 2015 |
| Kolbotn Infrastruktur AS | Professional & scientific | 2016 |
| Kolbotn Prosjekt AS | Real estate | 2021 |
| Kolbotn Utvikling AS | Real estate | 2016 |
| Kolbotnveien 16 AS | Real estate | 2020 |
| Kolbotnveien 22 AS | Real estate | 2001 |
| Kolbotnveien 8 AS | Real estate | 2017 |
| Kolbotnveien Utvikling AS | Real estate | 2021 |
| Kolbotnvn. 10 AS | Real estate | 2023 |
| Koldbrann Da | Arts & recreation | 2013 |
| Kolding Holding AS | | 2024 |
| Kolekcja AS | Professional & scientific | 2021 |
| Koleur AS | Wholesale & retail | 2022 |
| Kolff Holding AS | | 2024 |
| Kolflaath AS | Professional & scientific | 2015 |
| Koli AS | Wholesale & retail | 2023 |
| Kolibri Forsikring AS | Financial services | 2024 |
| Kolibri Kolonial AS | Wholesale & retail | 2021 |
| Kolibri Kolonial Drift AS | Manufacturing | 2016 |
| Kolibri Nest AS | | 2020 |
| Kolibrifx AS | Information & communication | 2011 |
| Kolilop AS | Information & communication | 2024 |
| Kollabrix AS | Information & communication | 2023 |
| Kollan AS | Real estate | 2001 |
| Kolle Holding AS | Administrative & support | 2014 |
| Kolle Kommunikasjon AS | Arts & recreation | 2016 |
| Kollega & Venn AS | Professional & scientific | 2025 |
| Kollega-Konsult AS | Real estate | 1980 |
| Kollegia AS | Information & communication | 2025 |
| Kollekt Rammer AS | Manufacturing | 2022 |
| Kollekted by AS | Wholesale & retail | 2013 |
| Kollektiv Intelligens AS | Information & communication | 2023 |
| Kollektiv Luksus Holding AS | | 2020 |