| Kelin Kraft AS | Information & communication | 1997 |
| Kelly's AS | Professional & scientific | 1996 |
| Kellys Profil AS | Manufacturing | 2024 |
| Kellys Reklame AS | Professional & scientific | 2007 |
| Ken Eiendom AS | Wholesale & retail | 2012 |
| Ken Roger Eiendom AS | Real estate | 2014 |
| Kennziger AS | Professional & scientific | 2022 |
| Kent Espeland Holding AS | Financial services | 2012 |
| Keystone Quality Management Solutions AS | Information & communication | 2026 |
| Kh.Art AS | | 2005 |
| KHF Holding AS | Real estate | 2006 |
| Khff Holding AS | | 2024 |
| Kho Invest AS | Real estate | 2005 |
| Kibu Holding AS | | 2019 |
| Kicap AS | Wholesale & retail | 2007 |
| Kicode AS | Information & communication | 2026 |
| Kim Hansen Design AS | Professional & scientific | 2021 |
| Kinn Helse AS | Health & social care | 2025 |
| Kinvest AS | Professional & scientific | 2012 |
| Kira Invest AS | Real estate | 2005 |
| Kirie Holding AS | | 2019 |
| Kirkegaten 138 AS | Real estate | 2012 |
| Kirkegaten Forvaltning AS | Real estate | 2017 |
| Kiropraktor Akutten AS | Health & social care | 2015 |
| Kiropraktor Karianne Moi AS | Health & social care | 2022 |
| Kiropraktorhetland AS | Health & social care | 1998 |
| Kirsten I. Husebø AS | Professional & scientific | 2022 |
| Kitch'N AS | Wholesale & retail | 1996 |
| Kittelsen Invest AS | Financial services | 2017 |
| Kitti Invest AS | | 2024 |
| Kjb-Holding AS | Real estate | 2005 |
| Kjell Dale AS | Health & social care | 2014 |
| Kjell Haver Regnskapsservice AS | Professional & scientific | 1988 |
| Kjell Holding AS | Financial services | 2012 |
| Kjell Holst Sæther Invest AS | Financial services | 2005 |
| Kjell Kjosavik AS | | 2002 |
| Kjell M Aase Holding AS | Financial services | 2005 |
| Kjell Meisland Eiendom AS | Real estate | 1985 |
| Kjell Åreskjold Invest AS | Manufacturing | 2020 |
| Kjemhus Hus & Hytter AS | Wholesale & retail | 2013 |
| Kjernebygg AS | Construction | 2018 |
| Kjernegjengen AS | Professional & scientific | 2014 |
| Kjerringøy Holding AS | | 2024 |
| Kjetil AS | | 2023 |
| Kjetil Klungtveit AS | Wholesale & retail | 2017 |
| Kjetså Holding AS | Financial services | 2014 |
| Kjeveklinikken AS | Health & social care | 2010 |
| Kjosavik Gruppen AS | Wholesale & retail | 1972 |
| Kjosavik Reiser AS | Transport & logistics | 2023 |
| Kjosavik Samdrift Da | Agriculture & fishing | 2001 |
| Kjosigarden AS | Wholesale & retail | 2019 |
| Kjærlighetshjelp AS | Real estate | 2016 |
| Kjøkkendrift No 1 AS | Wholesale & retail | 2009 |
| Kjøkkenmagi AS | Manufacturing | 2026 |
| Kjølemadsen Norge AS | Manufacturing | 2025 |
| Kjøretøy Og Maskin Utleie AS | Administrative & support | 2015 |
| KK Kapital AS | | 2026 |
| Klart Vann AS | Construction | 2019 |
| Klassiske Opel Deler Ans | Wholesale & retail | 2020 |
| Klavenes Holding AS | Financial services | 2014 |
| KLC Holding AS | Wholesale & retail | 2025 |
| Kleivane Utviklingsselskap AS | Real estate | 2011 |
| Klepp Apotek AS | Wholesale & retail | 2010 |
| Klepp Næringspark AS | Real estate | 2010 |
| Klimaservice AS | Construction | 1983 |
| Klingfolk Holding AS | | 2021 |
| Klingsheim Hogst & Hage AS | Administrative & support | 2021 |
| Klinikk Harmonia AS | Health & social care | 2017 |
| Klinikk Proaktiv AS | Health & social care | 2014 |
| Klinikk Spero AS | Health & social care | 2019 |
| Klinkenberg AS | | 2020 |
| KLIPP1 Holding AS | Real estate | 2007 |
| Klippen Forsikring AS | Financial services | 2014 |
| Klippen Lydsystemer AS | Arts & recreation | 1995 |
| Kluge Consultant AS | Information & communication | 2026 |
| Kløver Malerservise AS | Construction | 2020 |
| KM Prosjektering AS | Professional & scientific | 2023 |
| KMF Holding AS | Professional & scientific | 2024 |
| Knatten I AS | Real estate | 2004 |
| KNH Holding AS | Real estate | 2017 |
| Knoks Bildeler AS | Wholesale & retail | 1977 |
| Knusbart AS | Manufacturing | 2022 |
| Kobberveien 2 AS | Real estate | 2007 |
| Kodeflyt AS | Information & communication | 2018 |
| Kokk AS | Hospitality | 2024 |
| Kokstad Sushi AS | Hospitality | 2026 |
| Kol Invest AS | Real estate | 2014 |
| Kolari Holding AS | Wholesale & retail | 2005 |
| Kolbjørnsen AS | Professional & scientific | 2016 |
| Kolnes Konsult AS | Information & communication | 2025 |
| Kompetansefabrikken AS | Information & communication | 2002 |
| Koneisto AS | Manufacturing | 2022 |
| Kongsvik Consulting AS | Professional & scientific | 1997 |
| Konstruktiv Rådgivning AS | Professional & scientific | 2025 |
| Kontor Og Boliggulv AS | Construction | 1998 |
| Koordinatoren AS | Real estate | 2005 |
| Koppholen 2-4 AS | Real estate | 2006 |
| Korneliussen Holding AS | Financial services | 2014 |
| Korsvold Olsen Invest AS | | 2021 |
| Kort & Godt Fosshagen AS | Manufacturing | 2015 |