| Koteng Hylleselskap AS | Real estate | 2023 |
| Koteng Jenssen AS | Professional & scientific | 2019 |
| Koteng Jenssen Næring AS | Real estate | 2006 |
| KP Montering AS | Construction | 2023 |
| KPS Prosjekter AS | Administrative & support | 2025 |
| KR Capital AS | Professional & scientific | 2018 |
| KR Eiendomsinvest AS | Real estate | 2018 |
| KR Invest AS | Real estate | 2004 |
| KR1 Eiendom AS | Real estate | 2025 |
| Kraftverkene I Orkla Da | Energy | 1974 |
| Krag I AS | Professional & scientific | 2017 |
| Kragh Invest AS | | 2021 |
| Krambua Trondheim AS | Hospitality | 1998 |
| Krambugata 1 AS | Real estate | 1994 |
| Kramer AS | Real estate | 2017 |
| Kramkar AS | Professional & scientific | 2005 |
| Kranbilutleie AS | Transport & logistics | 2001 |
| Kranjohan AS | | 2018 |
| Kravia AS | Administrative & support | 2013 |
| Kreative Superhelter Da | Information & communication | 2023 |
| Krebreal Eiendom AS | Real estate | 2017 |
| Krebreal Eiendom Drift AS | Real estate | 2020 |
| Krebreal Holding AS | Professional & scientific | 2005 |
| Krebreal Holding AS | | 2025 |
| Kredittbanken ASA | Financial services | 1995 |
| Krem Mat Og Kaffehus AS | Hospitality | 2012 |
| Kreuzinger Und Manhart Turbulenz GmbH Nuf | Information & communication | 2018 |
| Krfa AS | | 2007 |
| Kriaan Holding AS | Real estate | 2023 |
| Kribro AS | | 2025 |
| Kringe AS | Wholesale & retail | 2013 |
| Krirunita AS | Real estate | 2012 |
| Krisby Holding AS | | 2025 |
| Kriss AS | Transport & logistics | 2005 |
| Kristian Skage Holding AS | | 2025 |
| Kristiansten Event AS | Professional & scientific | 2006 |
| Kristoffer Lo AS | Arts & recreation | 2020 |
| Kritran AS | Transport & logistics | 2002 |
| Krodigy AS | | 2019 |
| Krog Vekst AS | Real estate | 2022 |
| Krogh & Hammerfjell Eiendom AS | Construction | 2025 |
| Krogh Optikk H.Iversen AS | Wholesale & retail | 1969 |
| Krogstad Bil Holding AS | | 2025 |
| Krogstad Eiendom Holding AS | | 2025 |
| Krogstad Eiendom Og Invest AS | | 2020 |
| Krogstad Fam Holding AS | | 2025 |
| Kroksten AS | Professional & scientific | 2022 |
| Kroma AS | | 2022 |
| Krone Invest AS | Professional & scientific | 2010 |
| Kroppanmarka Grendelag Ba | Real estate | 1985 |
| Krossfuru AS | | 2019 |
| Krux Oppdal AS | Real estate | 2018 |
| Krystall Aurora AS | Wholesale & retail | 2020 |
| Krystallen AS | Health & social care | 2014 |
| Krøyma Sør AS | Real estate | 2016 |
| Krüger Engedal Holding AS | | 2026 |
| Ksbm AS | Wholesale & retail | 1991 |
| Kscc AS | Education | 2021 |
| KSK Autopark AS | Administrative & support | 2023 |
| KSS Invest AS | | 2017 |
| Kteo AS | Financial services | 2012 |
| KTG 85 AS | Real estate | 2020 |
| KTG Invest AS | | 2020 |
| Kuber AS | Professional & scientific | 2016 |
| Kuberget AS | Real estate | 2020 |
| Kuff AS | Wholesale & retail | 2026 |
| Kuhry Holding AS | Health & social care | 2016 |
| Kuldenor AS | Wholesale & retail | 2010 |
| Kulen Krogstad Holding AS | Real estate | 2024 |
| Kulturminnecompagniet AS | Construction | 1995 |
| Kulvik Holding AS | Arts & recreation | 2014 |
| Kummeneje AS | Real estate | 2015 |
| Kung Fu Bao AS | Hospitality | 2024 |
| Kungsbacka Eiendomsinvest AS | Real estate | 2018 |
| Kunsthall Trondheim AS | Arts & recreation | 2015 |
| Kunstklubben AS | Other services | 2022 |
| Kuppeli Norge AS | Wholesale & retail | 2022 |
| Kurant Holding AS | Real estate | 2020 |
| Kurante AS | Professional & scientific | 2020 |
| Kurius AS | Real estate | 2021 |
| Kurt J. Askim Holding AS | Real estate | 2006 |
| Kusæther Dagligvare AS | Wholesale & retail | 2025 |
| Kusæther Holding AS | | 2025 |
| KV Standal AS | | 2019 |
| Kvaal Invest AS | Financial services | 2005 |
| Kvadrat Arkitekter AS | Professional & scientific | 1986 |
| Kvadrat Byggprodukter AS | Wholesale & retail | 2020 |
| Kvalitetshengere AS | Wholesale & retail | 2016 |
| Kvaran Bongard AS | Wholesale & retail | 2022 |
| Kvark Holding AS | Professional & scientific | 2013 |
| Kvefi AS | Manufacturing | 2013 |
| Kvenild Areal AS | Real estate | 2002 |
| Kvenild Eiendom III AS | Real estate | 2012 |
| Kvenild Næring AS | Real estate | 2005 |
| Kvenildmyra 3 AS | Real estate | 2005 |
| Kvernhusvika Invest AS | Professional & scientific | 2017 |
| Kvernmo Brygge AS | Real estate | 2014 |
| Kvidul AS | Agriculture & fishing | 2018 |
| Kvilhaugen Gård AS | Hospitality | 2009 |
| Kvislabakken Eiendom AS | Real estate | 2014 |