| Kumoe Invest AS | Wholesale & retail | 2022 |
| Kun Nett HC AS | Professional & scientific | 2023 |
| Kundall AS | Financial services | 2005 |
| Kundekontroll AS | Professional & scientific | 2023 |
| Kundensbeste AS | Real estate | 2020 |
| Kundeserviceskolen AS | Education | 2018 |
| Kundesjekk AS | Professional & scientific | 2022 |
| Kundo Norge AS | Information & communication | 2019 |
| Kung Fu Express Norway AS | Wholesale & retail | 2016 |
| Kungsbacka Holding AS | Real estate | 2004 |
| Kuniko Norge AS | Professional & scientific | 2021 |
| Kunn AS | Information & communication | 2026 |
| Kunn Group AS | | 2026 |
| Kunnskapsbanken AS | Education | 2022 |
| Kunnskapsformidlerne AS | Professional & scientific | 2005 |
| Kunnskapsveien 55 AS | Real estate | 2001 |
| Kunst & Kultur Regnskap AS | Professional & scientific | 2007 |
| Kunst & Verdiforedling AS | Administrative & support | 2013 |
| Kunst AS | Arts & recreation | 2024 |
| Kunst Depo AS | Wholesale & retail | 2025 |
| Kunst Nord AS | Transport & logistics | 2013 |
| Kunst Og Bygningsglass Ove Blegen AS | Construction | 1982 |
| Kunst Og Kulturformidling AS | Education | 1998 |
| Kunstavisen AS | Information & communication | 1905 |
| Kunstblokka På Romsås AS | | 2025 |
| Kunstbokhandelen AS | Wholesale & retail | 2007 |
| Kunsteksperten AS | | 2025 |
| Kunsten Å Leve AS | Information & communication | 2025 |
| Kunstgress Da | Arts & recreation | 2024 |
| Kunsthall Oslo AS | Arts & recreation | 2010 |
| Kunstkompetanse / Art Advisory AS | Arts & recreation | 2014 |
| Kunstnerforbundet AS | Wholesale & retail | 1910 |
| Kunstnerne AS | Arts & recreation | 2025 |
| Kunstoppdrag AS | Information & communication | 2020 |
| Kunstverket Galleri AS | Wholesale & retail | 1989 |
| Kunyang Liu AS | Information & communication | 2023 |
| Kunzt AS | Arts & recreation | 2021 |
| Kupan B.V. Nuf | Construction | 2023 |
| Kupe Kraftverk AS | Energy | 2005 |
| Kupekraft AS | Energy | 2019 |
| Kupp Tekstil AS | Wholesale & retail | 2023 |
| Kupriianov Holdings AS | | 2023 |
| Kupu Holding AS | | 2026 |
| Kurated by AS | Professional & scientific | 2025 |
| Kuratert AS | Wholesale & retail | 2025 |
| Kurativ AS | Administrative & support | 2025 |
| Kurbadets Fysikalske Institutt AS | Health & social care | 1998 |
| Kurdistan Freedom Party | Other services | 2013 |
| Kurdistan Restaurant AS | Hospitality | 2023 |
| Kurdøla AS | Agriculture & fishing | 2015 |
| Kureåsen Vel SA | Real estate | 2015 |
| Kurillvegen 9 AS | Real estate | 2018 |
| Kuro Holding AS | | 2025 |
| Kuro Oslo AS | Hospitality | 2021 |
| Kuross Invest AS | | 2025 |
| Kurppa Hosk AS | Professional & scientific | 1994 |
| Kursconsult AS | Education | 2019 |
| Kursjentene AS | Education | 2017 |
| Kurskalenderen AS | Professional & scientific | 2022 |
| Kurskonsulenten AS | Professional & scientific | 2024 |
| Kursmesteren AS | Arts & recreation | 2025 |
| Kurson AS | Construction | 2018 |
| Kurt AS | Real estate | 2005 |
| Kurt Syversen Transport Og Eiendomsservice AS | Transport & logistics | 2006 |
| Kuskotopia AS | Real estate | 2016 |
| Kustos AS | Transport & logistics | 2002 |
| Kustås Invest AS | | 2024 |
| Kutt Vinslottet AS | Other services | 2019 |
| Kuuma Norge AS | Manufacturing | 2022 |
| Kuye Invest AS | Professional & scientific | 2021 |
| KV Holding AS | Financial services | 2004 |
| KV Ikt AS | Information & communication | 2005 |
| KV Majorstuen AS | Health & social care | 2014 |
| KV60 Holding AS | Real estate | 2024 |
| Kva AS | Real estate | 2004 |
| Kva Eiendom AS | Real estate | 2024 |
| Kvadrat Eiendom AS | Real estate | 1997 |
| Kvadrat Eiendomsutvikling AS | Real estate | 2014 |
| Kvadrat Norge AS | Wholesale & retail | 2004 |
| Kvadrat Takst AS | Professional & scientific | 2025 |
| Kvadraturen AS | Real estate | 2017 |
| Kvadraturen Dagligvare AS | Wholesale & retail | 2019 |
| Kvadraturen Eiendom AS | Real estate | 2026 |
| Kvadraturen Hotell Holding AS | Real estate | 2002 |
| Kvadraturen Pubdrift AS | Hospitality | 2022 |
| Kvadsheim & Johansen Holding AS | | 2016 |
| Kvae Da | Manufacturing | 2017 |
| Kvaenveien 1 AS | Real estate | 2005 |
| Kvaenveien 4 Eiendom AS | Real estate | 2015 |
| Kvaenveien 9 AS | Real estate | 2001 |
| Kvakenes Holding AS | | 2024 |
| Kvakkefly Holding AS | | 2020 |
| Kval Eiendom AS | Construction | 2021 |
| Kval Invest AS | | 2026 |
| Kvale Advokatfirma Da | Professional & scientific | 1988 |
| Kvalheim AS | Real estate | 1992 |
| Kvalia AS | Real estate | 1986 |
| Kvalitet Renhold Oslo AS | Administrative & support | 2020 |
| Kvalitet Renovering AS | Construction | 2026 |
| Kvalitet Service AS | Transport & logistics | 2024 |