| Klemert AS | Professional & scientific | 1982 |
| Klepp Handelshus Holding AS | Real estate | 2024 |
| KLF Eiendom AS | Real estate | 2024 |
| Klie Holding AS | | 2023 |
| Klikker AS | Wholesale & retail | 2026 |
| Klimacomfort AS | Construction | 2017 |
| Klimacomfort Service AS | Construction | 2023 |
| Klimatisk AS | Wholesale & retail | 2015 |
| Klinikk Asena AS | Other services | 2011 |
| Klinikk Ree AS | Health & social care | 2013 |
| Klinikk Stavanger AS | Health & social care | 2000 |
| Klinikk Vippen AS | Other services | 2025 |
| Klinken AS | Real estate | 2014 |
| KLK AS | Financial services | 2014 |
| Kloke Hoder AS | Administrative & support | 2018 |
| Kloster Olsen Invest AS | Professional & scientific | 2018 |
| Klostergaarden Leilighetshotell AS | Real estate | 1998 |
| Klubb Sponsor AS | Administrative & support | 2004 |
| Klubbgata Dagligvare AS | Wholesale & retail | 2025 |
| Kløver Kapital AS | | 2025 |
| KM Investering AS | Wholesale & retail | 2022 |
| KM Properties AS | Real estate | 2022 |
| KM Roe AS | Professional & scientific | 2020 |
| KMB Invest AS | | 2000 |
| KMM Holding AS | | 2020 |
| KMM Invest AS | | 2021 |
| KMQ Invest AS | Professional & scientific | 2020 |
| KMS AS | Financial services | 2005 |
| Kmsk Holdings AS | | 2019 |
| KN Crew Holding AS | | 2025 |
| Knallhart Holding AS | Real estate | 2015 |
| Knert AS | | 2026 |
| Knight Holdings AS | Professional & scientific | 2017 |
| Knitandnote AS | Information & communication | 2021 |
| Knoph Eiendom Invest AS | | 2023 |
| Knoph Holding AS | Professional & scientific | 2021 |
| Knowing Why AS | Professional & scientific | 2017 |
| KNR Eiendom AS | Real estate | 2017 |
| KNR Finans AS | Real estate | 2017 |
| KNR Invest AS | Real estate | 1989 |
| Knud Holms Venture I AS | Financial services | 2018 |
| Knud Holmsgate 3 AS | Real estate | 2013 |
| Knud Holmsgt. 5 Eiendom AS | Real estate | 1994 |
| Knut Øgreid AS | Financial services | 2005 |
| Knut's Montasje AS | Construction | 2013 |
| Knutco 2 AS | | 2023 |
| Knutco AS | | 2021 |
| Knutco Hylle AS | | 2025 |
| Knutsen & Didriksen AS | Real estate | 2005 |
| Knutsen Bygg Og Eiendom AS | Construction | 2013 |
| Knutsvik Drift AS | Construction | 2023 |
| Knutsvik Holding AS | Construction | 2022 |
| Knutsvik Invest AS | | 2025 |
| Kobari AS | Administrative & support | 2025 |
| Kobe AS | Professional & scientific | 2018 |
| Koch AS | Wholesale & retail | 1985 |
| Kode Holding AS | | 2022 |
| Kodefolk AS | Information & communication | 2022 |
| Kof AS | Professional & scientific | 2012 |
| Kohort AS | Hospitality | 2021 |
| Kohort Local AS | Hospitality | 2021 |
| Kokko Holding AS | Hospitality | 2014 |
| Kokko Kaffebar AS | Hospitality | 2014 |
| Kolibri Consulting AS | Professional & scientific | 2026 |
| Kolnes Cybernetic Consulting AS | Professional & scientific | 2005 |
| Kolnes Eiendom AS | Real estate | 2023 |
| Kolnes Geoservice AS | Wholesale & retail | 2005 |
| Kolumbra AS | Financial services | 2011 |
| Kolumbus AS | Public administration | 2014 |
| Kommers AS | Wholesale & retail | 2025 |
| Kompani Arnesen AS | Professional & scientific | 2017 |
| Kompaniet AS | Wholesale & retail | 2012 |
| Kompaniet Gruppen AS | Real estate | 2012 |
| Komplett Bolig Eiendom AS | Real estate | 2021 |
| Komplett Bolig Rogaland AS | Construction | 2018 |
| Komplett Holding AS | Construction | 2021 |
| Komponistforlaget AS | Wholesale & retail | 2025 |
| Kon Holding AS | Construction | 1992 |
| Konab AS | Professional & scientific | 2005 |
| Konciv AS | Information & communication | 2017 |
| Kong Kurs AS | Professional & scientific | 2013 |
| Kongebra AS | | 2020 |
| Kongsgata 42 AS | Real estate | 2019 |
| Kongsgata 46 AS | Real estate | 2025 |
| Kongsgaten 10 AS | Real estate | 1987 |
| Kongsgaten 10 Holding AS | Real estate | 2025 |
| Kongsgaten Consult AS | Hospitality | 1984 |
| Kongsgt 52-58 AS | Real estate | 2014 |
| Kongsmarka AS | Real estate | 2019 |
| Konkylie Design AS | Wholesale & retail | 2024 |
| Konrad Nilsen Rørleggerfirma AS | Construction | 1984 |
| Konrat AS | Administrative & support | 2015 |
| Konsept TT AS | Arts & recreation | 2022 |
| Konsiso AS | Professional & scientific | 2025 |
| Konsul Brumm AS | Professional & scientific | 2005 |
| Konsulent Tønnessen AS | Professional & scientific | 2019 |
| Kontiki Bruktbil AS | Wholesale & retail | 2020 |
| Kontoret Arkitekter AS | Professional & scientific | 2026 |
| Kontoret for Utvikling Lek Og Læring AS | Professional & scientific | 2017 |
| Kontorservice AS | Real estate | 1975 |