| Keylane Norway AS | Information & communication | 2019 |
| Keylofsen Holding AS | | 2025 |
| Keyloop (Norge) AS | Information & communication | 1981 |
| Keymind Computing AS | Information & communication | 1998 |
| Keymoor AS | Financial services | 2016 |
| Keymoor Consulting AS | Professional & scientific | 2024 |
| Keymoss AS | | 2026 |
| Keypass AS | Administrative & support | 2014 |
| Keypro AS | Information & communication | 2006 |
| Keysec AS | Administrative & support | 2015 |
| Keyser Capital Partners AS | Real estate | 2005 |
| Keyser Oslo AS | Hospitality | 2022 |
| Keyserløkka Nord Garasjelag III SA | Real estate | 2019 |
| Keyserløkka Syd Garasjelag SA | Real estate | 1958 |
| Keysers Gate 1 AS | Real estate | 2019 |
| Keysers Gate 13 AS | Real estate | 2019 |
| Keysers Gate 5 AS | Real estate | 2007 |
| Keysight Engineering AS | Information & communication | 2015 |
| Keystone Advisory AS | Professional & scientific | 2026 |
| Keystone Digital Da | Information & communication | 2026 |
| Keystone Eiendom AS | Real estate | 2023 |
| Keystone Holding AS | Real estate | 2009 |
| Keystone Invest AS | | 2026 |
| Keystone Property Group AS | Real estate | 2024 |
| Keystones AS | Administrative & support | 2005 |
| Keystones Management AS | Administrative & support | 2013 |
| Keytor Maritime Partner AS | Information & communication | 2018 |
| Kezzler AS | Information & communication | 2001 |
| KF Entreprenør AS | Construction | 2005 |
| KF Future AS | Real estate | 2005 |
| Kf-Holding AS | Real estate | 2005 |
| Kfa - Kompetanse for Fysisk Aktivitet AS | Arts & recreation | 2013 |
| Kfa Capital AS | | 2018 |
| Kfa Retail Invest AS | | 2024 |
| KFB AS | Professional & scientific | 2005 |
| KFG AS | Financial services | 2010 |
| Kfi Spa Management Norge AS | Professional & scientific | 2011 |
| Kfiiv AS | | 2021 |
| Kfix AS | | 2021 |
| KFK Holding AS | Financial services | 2008 |
| KFK III AS | | 2023 |
| Kfo AS | Wholesale & retail | 2024 |
| KFS AS | Financial services | 2014 |
| Kfum Arena AS | Arts & recreation | 2021 |
| Kfum Bad AS | Arts & recreation | 2021 |
| Kfum Barnehage AS | Education | 2021 |
| Kfum Eiendom AS | Real estate | 2007 |
| Kfum Familiearena AS | Arts & recreation | 2020 |
| Kfum Hallen AS | Real estate | 2007 |
| Kfum Stadion AS | Arts & recreation | 2021 |
| KG 10 Invest AS | Real estate | 2020 |
| KG 27 Eiendom AS | Real estate | 2020 |
| KG 27 Holding AS | Real estate | 2021 |
| KG 27 Næring AS | Real estate | 2022 |
| KG and Invest AS | | 2020 |
| KG Bygg AS | Real estate | 2018 |
| KG Investment Comp AS | Real estate | 2003 |
| KG Næring AS | Real estate | 2019 |
| KG Studio AS | Professional & scientific | 2014 |
| Kg.No Da | Professional & scientific | 2000 |
| KG2 Invest AS | Real estate | 2021 |
| KG26 Eiendom AS | Real estate | 2019 |
| KG26 Holding AS | Real estate | 2019 |
| KG9 Holding AS | Real estate | 2019 |
| KG9 Invest AS | Real estate | 2019 |
| Kga 110 AS | Real estate | 2025 |
| Kga 164 AS | Real estate | 2025 |
| Kga AS | | 2017 |
| Kga Eiendom AS | Real estate | 2009 |
| Kga Invest AS | Real estate | 2005 |
| KGB AS | Professional & scientific | 2026 |
| KGB Finans AS | | 2025 |
| KGC Norway AS | Construction | 2021 |
| KGD AS | Professional & scientific | 2023 |
| Kge AS | Financial services | 2005 |
| KGH Invest I AS | Financial services | 2005 |
| Kgh-Kontoret AS | Real estate | 2025 |
| KGJ Capital AS | Financial services | 2005 |
| KGJ Investment Holding Limited Nuf | Financial services | 2016 |
| KGJ Partnership I AS | Financial services | 2017 |
| KGJ Partnership IV AS | Financial services | 2014 |
| KGJ Partnership Ix AS | Financial services | 2023 |
| KGJ Partnership V AS | Financial services | 2015 |
| KGJ Partnership Vi AS | Financial services | 2017 |
| KGJ Partnership Vii AS | Financial services | 2019 |
| KGJ Partnership Viii AS | Financial services | 2021 |
| KGJ Partnership X AS | Financial services | 2025 |
| KGJ Real Estate AS | Financial services | 2008 |
| KGK AS | | 2019 |
| KGK Holding AS | Wholesale & retail | 2005 |
| KGK Invest AS | Financial services | 2017 |
| KGL Holding Company AS | | 2024 |
| KGR Drift AS | Wholesale & retail | 2018 |
| Kgra Holdings AS | | 2024 |
| KGS Fire & Security Norge AS | Wholesale & retail | 1993 |
| KGT 47 AS | Real estate | 2022 |
| KH Consulting AS | Professional & scientific | 2020 |
| KH Media AS | Professional & scientific | 2025 |
| KH1 Holding AS | | 2015 |
| Khalifa AS | Transport & logistics | 2021 |