| Kritiske Mineraler AS | Professional & scientific | 2023 |
| Krito AS | Real estate | 2013 |
| Krito Holding AS | | 2025 |
| Kritor Holding AS | | 2024 |
| Kritt Arkitekter AS | Professional & scientific | 1997 |
| Krittveien 59 AS | Real estate | 2013 |
| Kriwil AS | Health & social care | 2023 |
| Kriwoi Invest AS | | 2026 |
| Krjm AS | Real estate | 2006 |
| KRK Fum AS | | 2024 |
| KRK Invest AS | Professional & scientific | 2012 |
| Krka Sverige AB | Wholesale & retail | 2006 |
| Krmr Distribution AS | Wholesale & retail | 2013 |
| Krmy AS | Manufacturing | 2022 |
| Kro Produksjon AS | Manufacturing | 1983 |
| Kroba AS | Real estate | 2019 |
| Kroba Studio AS | Wholesale & retail | 2024 |
| Kroerveien 51 AS | Real estate | 2019 |
| Kroerveien 7 Utvikling AS | Real estate | 2016 |
| Krog & Co AS | Professional & scientific | 1988 |
| Krog Bygg & Eiendom AS | Construction | 2000 |
| Krog Forvaltning AS | Financial services | 2005 |
| Krog Holding AS | Wholesale & retail | 2025 |
| Krogdahl Holding AS | | 2023 |
| Krogedal Holding AS | Professional & scientific | 2022 |
| Krogfos AS | Real estate | 2015 |
| Krogh 1877 AS | Professional & scientific | 2026 |
| Krogh Holding AS | Wholesale & retail | 2005 |
| Krogh Investment Group AS | Financial services | 2021 |
| Krogh Optikk AS | Wholesale & retail | 1973 |
| Krogh Optikk Drift AS | Wholesale & retail | 1986 |
| Kroghaag AS | | 2019 |
| Kroghgruppen AS | Real estate | 2005 |
| Kroghs Bilsalg AS | Wholesale & retail | 1983 |
| Kroghs Eiendom AS | Real estate | 1991 |
| Kroghs Holding AS | | 2022 |
| Kroghshow AS | Information & communication | 2020 |
| Krogs Snekkerverksted AS | Real estate | 2010 |
| Krogsrud Invest AS | Real estate | 1992 |
| Krogsrud Marine Service AS | Manufacturing | 1994 |
| Krogstad Baczewski Rør AS | Construction | 2015 |
| Krogstad Eiendom AS | Real estate | 2010 |
| Krogstadfjorden Eiendom AS | Real estate | 2000 |
| Krogstads Dampskibsrederi AS | Transport & logistics | 1924 |
| Krogsæter AS | | 2020 |
| Krogsæter Holding AS | Real estate | 2020 |
| Krohn Capital AS | | 2019 |
| Krohn Communication AS | Arts & recreation | 2015 |
| Krohn Eide Holding AS | | 2021 |
| Krohn Holding AS | Professional & scientific | 2006 |
| Krohn Horisont AS | | 2020 |
| Krohn Mørland Holding AS | Financial services | 2015 |
| Krohnark AS | Professional & scientific | 2016 |
| Krohnark Holding AS | Professional & scientific | 2017 |
| KROKA2 Kraft AS | Energy | 2019 |
| Krokan Invest AS | | 2022 |
| Krokan Transport AS | Transport & logistics | 2007 |
| Krokatjønnveien 15 AS | Real estate | 2008 |
| Kroken AS | Construction | 2025 |
| Kroken Invest AS | Professional & scientific | 1992 |
| Krokket AS | Health & social care | 2026 |
| Kroklia AS | Real estate | 2005 |
| Kroklia Garasjelag SA | Real estate | 1985 |
| Kroklia Huseierlag SA | Real estate | 1984 |
| Kroknes Mgmt AS | Information & communication | 2014 |
| Kroko Holding AS | | 2023 |
| Krokstad Handelspark AS | Real estate | 1994 |
| Krokstadelva Butikkeiendom AS | Real estate | 2020 |
| Krokus Holding AS | | 2023 |
| Krokus Invest AS | | 2005 |
| Krol AS | Real estate | 2013 |
| Krole AS | Health & social care | 2009 |
| Kroloftet Servering AS | Hospitality | 2020 |
| Kroma Maling AS | Construction | 2018 |
| Kron & Mynt AS | Arts & recreation | 2001 |
| Kron Dental Ullevaal Stadion AS | Health & social care | 1991 |
| Krona Eiendom AS | Real estate | 2016 |
| Kronarb Eiendom AS | Real estate | 2005 |
| Kronasjer AS | | 2019 |
| Kronberg-Moe Holding AS | | 2022 |
| Kronblad AS | Information & communication | 2024 |
| Kronborg Oslo AS | Financial services | 2012 |
| Kronesmart AS | Real estate | 2024 |
| Kronogården Bolig AS | Real estate | 2015 |
| Kronos Invest AS | Real estate | 1918 |
| Kronprinsens Gate 3 AS | Real estate | 2016 |
| Kronprinsens Gate 46 AS | | 2025 |
| Kronprinsens Gate 9 AS | Real estate | 2007 |
| Kronprinsensgate 2 AS | Real estate | 2013 |
| Kronski Holding AS | | 2026 |
| Kronstad AS | Wholesale & retail | 2017 |
| Kronstad Stasjon AS | Real estate | 2016 |
| Krook & Tjäder Arkitekter AS | Professional & scientific | 2017 |
| Kroos Holding AS | | 2022 |
| Kroppskontroll AS | Health & social care | 2019 |
| Kroppsverket AS | Health & social care | 2007 |
| Kros Consulting AS | Professional & scientific | 2024 |
| Krosport AS | Wholesale & retail | 2023 |
| Kross AS | | 2025 |
| Krossdalselvi Kraft AS | Energy | 2018 |