| Krovella Agency AS | Professional & scientific | 2005 |
| Krovind AS | | 2021 |
| Krow Bidco AS | Arts & recreation | 2023 |
| Krox Nuf | Health & social care | 2013 |
| KRS Invest AS | Real estate | 2021 |
| Krtrees Ans | Wholesale & retail | 2008 |
| Kru 794 Holding AS | | 2023 |
| Kruela Film AS | Information & communication | 2023 |
| Krug Eiendom AS | Real estate | 2024 |
| Kruger Industrial Smoothing AS | | 2021 |
| Krunene Holding AS | | 2025 |
| Kruse Larsen AS | Professional & scientific | 1995 |
| Kruse Smith AS | Real estate | 2005 |
| Kruse Smith Invest AS | Real estate | 2012 |
| Krusedull Barnehage Ans | Education | 1997 |
| Krusesgate 8 AS | Real estate | 1949 |
| Krush Tech AS | Information & communication | 2026 |
| Kruski H AS | | 2018 |
| Krusninger AS | Other services | 2023 |
| Kruszelnicki Thoasz | Construction | 2007 |
| Krutt & Plutt AS | Information & communication | 2020 |
| Krutthuset Oslo SA | Education | 2018 |
| Kruttsterk Kapital AS | | 2019 |
| Kruz Design AS | Professional & scientific | 2022 |
| KRV01 AS | Real estate | 2021 |
| KRW Invest AS | Financial services | 2005 |
| Kry Eiendom AS | Real estate | 2015 |
| KRY2 AS | Information & communication | 2014 |
| Krydderhagen Garasje AS | Real estate | 2014 |
| Kryddern AS | Hospitality | 2021 |
| Krympeplast AS | Wholesale & retail | 2015 |
| Kryos Consulting AS | Information & communication | 2024 |
| Krypt AS | | 2021 |
| Kryptocore AS | Information & communication | 2025 |
| Kryptofolio AS | Information & communication | 2025 |
| Kryptogram AS | | 2022 |
| Kryptoinvest AS | Financial services | 2018 |
| Krypton Film AS | Administrative & support | 2009 |
| Krypton Holding AS | Administrative & support | 2009 |
| Krypton Lyd AS | Information & communication | 2025 |
| Kryptonitt AS | | 2021 |
| Kryptools AS | Information & communication | 2025 |
| Kryptosekken AS | Information & communication | 2018 |
| Kryptoskolen AS | Education | 2022 |
| Krys Klatran Eiendom AS | Real estate | 2019 |
| Kryss AS | Health & social care | 2025 |
| Kryss I Taket AS | Arts & recreation | 2009 |
| Krysse AS | Professional & scientific | 2019 |
| Krystal Holding AS | | 2005 |
| Kråka AS | | 2023 |
| Kråka Produksjoner AS | Arts & recreation | 2024 |
| Kråke Ans | Manufacturing | 2004 |
| Kråke Konsulting AS | Professional & scientific | 2025 |
| Kråkehaugen AS | Real estate | 2014 |
| Kråkeyoga AS | Education | 2024 |
| Kråknakken AS | Real estate | 1986 |
| Krøgenes AS | | 2021 |
| Krøk AS | Administrative & support | 2021 |
| Krøkle Holding AS | | 2022 |
| Krølle Holding AS | | 2023 |
| Krølle Invest AS | | 2025 |
| Krølltopp AS | Professional & scientific | 2021 |
| Krøs AS | Real estate | 2000 |
| Krøsus Invest AS | | 2007 |
| Krüg AS | Financial services | 2024 |
| Krüger Svensson AS | | 2026 |
| Krügers AS | Professional & scientific | 2025 |
| KS Breivollveien 25 | Real estate | 1985 |
| KS Holmsborg | Real estate | 1990 |
| KS Invest AS | | 2018 |
| KS Luftgassproduksjon | Real estate | 1985 |
| KS Master AS | Information & communication | 2025 |
| KS Right Viking | Mining & quarrying | 1989 |
| KS Skøyenveien 39B | Real estate | 1986 |
| KS Tollbugaten 35 | Real estate | 1986 |
| Ks-Agenda AS | Education | 2005 |
| Ks-Digitale Fellestjenester AS | Professional & scientific | 2023 |
| Ks-Holding AS | Information & communication | 2006 |
| Ks-Karlsson Invest AS | | 2026 |
| Ks-Konsulent AS | Professional & scientific | 2011 |
| Ks-Kontroll AS | Professional & scientific | 2023 |
| Ks-Møteplasser AS | Administrative & support | 2022 |
| Ks-Sirkus AS | | 2017 |
| Ksakademi AS | Education | 2021 |
| Ksakha Konsulent AS | Information & communication | 2025 |
| Ksauto AS | Other services | 2018 |
| Ksbh Holding AS | | 2026 |
| Ksde AS | Other services | 2024 |
| Kse Invest AS | | 2018 |
| Kse Kapital AS | | 2022 |
| KSG 7 AS | Real estate | 2020 |
| KSG AS | | 2024 |
| KSG Invest AS | | 2023 |
| KSH Maritime AS | Professional & scientific | 2018 |
| KSH Norge AS | Construction | 2025 |
| Ksholding AS | Real estate | 2023 |
| Ksjoh Invest AS | Real estate | 2016 |
| KSL Design AS | Wholesale & retail | 2016 |
| KSM Invest AS | | 2022 |
| KSN Capital AS | Financial services | 2022 |