| Karagra AS | Real estate | 2020 |
| Karahco AS | Professional & scientific | 2021 |
| Karakoc Management AS | Hospitality | 2012 |
| Karakter Bolig AS | Real estate | 2017 |
| Karakterboost AS | Education | 2024 |
| Karall Invest AS | | 2025 |
| Karamina AS | Real estate | 2005 |
| Karamina Eiendom AS | Real estate | 2014 |
| Karaoke Sport AS | Hospitality | 2019 |
| Karat Da | Information & communication | 2011 |
| Karat Gull AS | Wholesale & retail | 2013 |
| Karat Jewellers AS | Wholesale & retail | 2022 |
| Karatekatt AS | Information & communication | 2026 |
| Karavane AS | Information & communication | 2024 |
| Karbon Eiendom AS | Real estate | 2015 |
| Karbon Eiendom Utvikling AS | Real estate | 2016 |
| Karbon Equity AS | Real estate | 2024 |
| Karbon Equity Holding AS | Professional & scientific | 2024 |
| Karbon Invest AS | Real estate | 2019 |
| Karbon Services AS | Professional & scientific | 2018 |
| Karde AS | Professional & scientific | 2004 |
| Kardemomme Barnehage SA | Education | 1994 |
| Kardima AS | Manufacturing | 2025 |
| Kardiolog Zoran Radunovic AS | Health & social care | 2020 |
| Kareliussen Invest AS | | 2023 |
| Karen Heidel AS | Professional & scientific | 2015 |
| Karen Holding AS | | 2021 |
| Karen Ueland AS | Health & social care | 2023 |
| Karenslyst Alle 12-14 Parkering Hjemmel AS | Real estate | 2005 |
| Karenslyst Alle 16 Ans | Real estate | 2000 |
| Karenslyst Alle 53 Business Centre AS | Real estate | 2017 |
| Karenslyst Alle 6 Parkering AS | Real estate | 2007 |
| Karenslyst Allé 10 AS | Real estate | 2021 |
| Karenslyst Allé 12-14 Hjemmel AS | Real estate | 1996 |
| Karenslyst Allé 6 AS | Real estate | 2005 |
| Karenslyst Allé 7 AS | Real estate | 1994 |
| Karenslyst Allé 8A Og B AS | Real estate | 2010 |
| Karenslyst Allé 9-11 AS | Real estate | 2021 |
| Karhu AS | | 2022 |
| Kari AS | | 2021 |
| Kari C. Toverud AS | Arts & recreation | 2006 |
| Kari C. Toverud Holding AS | Arts & recreation | 2007 |
| Kari Consulting Ans | Information & communication | 1988 |
| Kari Eiendom AS | Real estate | 1985 |
| Kari Invest AS | | 2005 |
| Kari Johansen Eiendom AS | Real estate | 1998 |
| Kari Mari AS | Financial services | 2021 |
| Kari Rolstad AS | Real estate | 2006 |
| Kari Sortland AS | Arts & recreation | 2007 |
| Kari Stange Holding AS | Financial services | 2005 |
| Karianne Amlie AS | Arts & recreation | 2014 |
| Karianne Hartviksen AS | Professional & scientific | 2023 |
| Karianne Lauritzen Holding AS | | 2024 |
| Karianne Spetalen AS | Professional & scientific | 2025 |
| Kariatide AS | Professional & scientific | 2017 |
| Kariatide Invest AS | Professional & scientific | 2021 |
| Karibu AS | | 2025 |
| Karihaugen Apotek AS | Wholesale & retail | 2021 |
| Karihaugen Lakk Og Karosseri AS | Other services | 2023 |
| Karihaugen Logistikkpark AS | Real estate | 2010 |
| Karihaugen Næringseiendom AS | Real estate | 2021 |
| Karihaugveien 22 Barnehage AS | Real estate | 2024 |
| Karihaugveien 22 Handel AS | Real estate | 2023 |
| Karihaugveien 22 Seksjon 2 AS | Real estate | 2017 |
| Karihaugveien 89 Utbygging AS | Real estate | 2005 |
| Karim Pizza AS | Hospitality | 2026 |
| Karin Hannisdahl Holding AS | | 2025 |
| Karin Holm Psykomotorisk Fysioterapi AS | Health & social care | 2020 |
| Karin Kosmetiske AS | Health & social care | 2021 |
| Karin Thorsnes Holding AS | | 2026 |
| Karina AS | Real estate | 2020 |
| Karina Holding AS | | 2026 |
| Karioke AS | | 2025 |
| Karisma Auto AS | Wholesale & retail | 2022 |
| Karisma Holding AS | Information & communication | 2018 |
| Karjiang Holding AS | | 2020 |
| Karko Risk Capital AS | | 2015 |
| Karl a Haraldsen 2 AS | | 2020 |
| Karl a Haraldsen 3 AS | | 2020 |
| Karl Johan Hotellinvest AS | Real estate | 2006 |
| Karl Johan Øyeklinikk AS | Health & social care | 2014 |
| Karl Johans Gate 12 AS | Real estate | 2006 |
| Karl Johans Gate 12 J AS | Real estate | 2016 |
| Karl Johans Gate 13 Eiendom AS | Real estate | 2019 |
| Karl Johans Gate 14 AS | Real estate | 2010 |
| Karl Johans Gate 16C AS | Real estate | 2023 |
| Karl Johans Gate 17 AS | Real estate | 1940 |
| Karl Johans Gate 18 AS | Real estate | 2019 |
| Karl Johans Gate 20 AS | Real estate | 2018 |
| Karl Johans Gate 21 Ans | Real estate | 1991 |
| Karl Johans Gate 3 AS | Real estate | 1915 |
| Karl Johans Gate 33 AS | Real estate | 1911 |
| Karl Johans Gate 4 AS | Real estate | 1983 |
| Karl Johans Gate 6 AS | Real estate | 2013 |
| Karl Johans Gate 8 AS | Real estate | 2019 |
| Karl K Andersen AS | Health & social care | 1985 |
| Karl Nordfalk AS | Health & social care | 2016 |
| Karl Stenstad Invest AS | Information & communication | 1989 |
| Karl-Ewerth Horneman AS | Health & social care | 1987 |
| Karlander Eiendom AS | Real estate | 2022 |