| Kompetanseunion A/S | Professional & scientific | 1988 |
| Kompexa AS | Information & communication | 2025 |
| Kompis Lillo Gård AS | Hospitality | 2020 |
| Kompis Røa AS | Hospitality | 2020 |
| Komplement Da | Wholesale & retail | 2010 |
| Komplett Drift AS | Real estate | 2017 |
| Komplett Eiendomsmegling AS | Real estate | 2003 |
| Komplett Elektro Installasjon AS | Construction | 2009 |
| Komplett Rør AS | Construction | 2025 |
| Komplett Service Partner AS | Administrative & support | 2012 |
| Komplett Taksering AS | Real estate | 1993 |
| Komplhex AS | Information & communication | 2022 |
| Komponent AS | Information & communication | 2024 |
| Kompromiss AS | Financial services | 2012 |
| Kon-Tiki Wines AS | Wholesale & retail | 2026 |
| Kon-Vikji AS | | 2021 |
| Kona Bidco AS | Real estate | 2026 |
| Kona Invest AS | | 2020 |
| Kona Midco AS | | 2026 |
| Kona Top Holding AS | Real estate | 2026 |
| Kona Topco AS | Real estate | 2026 |
| Konah Invest AS | Financial services | 2007 |
| Konaj Holding AS | | 2016 |
| Konas Bulkoppretting AS | Other services | 2019 |
| Konas Holding AS | Administrative & support | 2017 |
| Koncha Drift 1 AS | Hospitality | 2019 |
| Kondatex Service AS | Wholesale & retail | 2008 |
| Kone Aksjeselskap | Construction | 1973 |
| Konferansehoteller.No AS | Administrative & support | 1994 |
| Konferansesenteret AS | Real estate | 2021 |
| Konfidens Pay AS | Information & communication | 2018 |
| Konfidi AS | Information & communication | 2022 |
| Konfido Consulting AS | Information & communication | 2013 |
| Konfitech AS | Information & communication | 2024 |
| Konfér AS | Professional & scientific | 2022 |
| Kong Karlsens Catering Ans | Hospitality | 1999 |
| Kong Koopa AS | | 2020 |
| Kong Kos Holding AS | | 2021 |
| Kong Management AS | | 2023 |
| Kong Tiki Records AS | Wholesale & retail | 2004 |
| Konge Rengjøring AS | Administrative & support | 2004 |
| Kongelf AS | Other services | 2026 |
| Kongen Marina AS | Wholesale & retail | 1993 |
| Kongens Gate 12 AS | Real estate | 2006 |
| Kongens Gate 12 Holding AS | | 2022 |
| Kongens Gate 16 Ålesund AS | Real estate | 2022 |
| Kongens Gate 18 AS | Real estate | 2012 |
| Kongens Gate 19 AS | Real estate | 2021 |
| Kongens Gate 2 Holding AS | Real estate | 2020 |
| Kongens Gate 20 AS | Real estate | 2018 |
| Kongens Gate 2A Holding AS | Real estate | 2021 |
| Kongens Gate 3 Oslo AS | Real estate | 2005 |
| Kongens Gate 9 Næring AS | Real estate | 2025 |
| Kongens Gate 93 AS | Real estate | 2022 |
| Kongens Gate AS | Real estate | 2024 |
| Kongens Gate Bolig AS | Real estate | 2025 |
| Kongens Yoga AS | Education | 2017 |
| Kongensgate 1 AS | Real estate | 2008 |
| Kongensgate 11 Oslo AS | Real estate | 2001 |
| Kongensgate 14 - 18 AS | Professional & scientific | 2005 |
| Kongensgate 15 AS | Real estate | 2007 |
| Kongensgate 18-20 AS | Real estate | 2007 |
| Kongensgate 2 Trondheim AS | Real estate | 2012 |
| Kongensgate 21 Moss AS | Real estate | 2017 |
| Kongensgate 21 Moss Invest AS | Real estate | 2017 |
| Kongensgate 22 AS | Real estate | 1994 |
| Kongensgate 31 AS | Real estate | 1997 |
| Kongensgate Eiendom AS | Real estate | 2007 |
| Kongensgt. 2 a AS | Real estate | 2007 |
| Kongeveien 47 AS | Real estate | 2017 |
| Kongeveien 49 Kolbotn AS | Real estate | 2005 |
| Kongeørnen Barnehage AS | Education | 2022 |
| Konggata 51 AS | Real estate | 2014 |
| Konggata 51 Tomteselskap AS | | 2026 |
| Konghelle AS | Real estate | 1998 |
| Konghelle Bil AS | Wholesale & retail | 2005 |
| Konghellegata 10 AS | Real estate | 2021 |
| Konghellegaten Eiendom Ans | Real estate | 1999 |
| Kongkrolla AS | Arts & recreation | 2020 |
| Kongla AS | Administrative & support | 1996 |
| Kongla Boligforvaltning AS | Real estate | 2018 |
| Konglebo AS | | 2021 |
| Kongs.Li AS | Financial services | 2016 |
| Kongsberg Beam Technology AS | Professional & scientific | 2005 |
| Kongsberg Industribygg AS | Real estate | 2018 |
| Kongsberg Industrieiendom AS | Real estate | 2012 |
| Kongsberg Kontoreiendom AS | Real estate | 2013 |
| Kongsberg Terrasse AS | Real estate | 2012 |
| Kongsdal AS | Real estate | 2021 |
| Kongsgaard Holding AS | | 2018 |
| Kongsgård Allé 20 AS | Real estate | 2016 |
| Kongshavn Kai AS | Real estate | 2005 |
| Kongsholmen AS | Information & communication | 2017 |
| Kongskilen AS | Real estate | 2019 |
| Kongsli Ventures AS | Financial services | 2014 |
| Kongsmoen AS | Wholesale & retail | 1981 |
| Kongsrud Gård Ans | Agriculture & fishing | 2025 |
| Kongssenteret Eiendom AS | Real estate | 1999 |
| Kongssenteret Holding AS | Real estate | 2022 |
| Kongstad Ventures AS | Real estate | 2019 |