| Johe Eiendom AS | Real estate | 2013 |
| Joja - Holding AS | | 2026 |
| Jon Røkenes Holding AS | Manufacturing | 2005 |
| Jona Johansson AS | Construction | 2024 |
| Jop Bygg AS | Construction | 2022 |
| Jopu Eiendom AS | Real estate | 2013 |
| Joros Bygg AS | Construction | 2015 |
| Jorra Samdrift Da | Agriculture & fishing | 2005 |
| Josefine Aa. Haugen AS | Real estate | 2019 |
| Josi Eiendom Og Consulting AS | Real estate | 2010 |
| JP Anleggsteknikk AS | Construction | 2026 |
| JPH Invest Holding AS | | 2026 |
| Jrbp Camp Og Utleie AS | Hospitality | 2025 |
| JSP AS | | 2005 |
| Juguth Regmed AS | Health & social care | 2026 |
| Just Presis AS | Professional & scientific | 2021 |
| Jve AS | Agriculture & fishing | 2021 |
| Jøraholmen Gård AS | Administrative & support | 2024 |
| Jørn-Tore Opgård Holding AS | Real estate | 2019 |
| K Ek AS | Real estate | 2007 |
| K S Sørlie AS | Construction | 2002 |
| K-Aga Invest AS | Construction | 2022 |
| K. Kristensen Bygg AS | Real estate | 2012 |
| K. Kristensen Eiendom AS | Construction | 2005 |
| K.A Jakobsen AS | Transport & logistics | 2026 |
| K.A. Eiendom AS | Real estate | 2018 |
| K.G Eiendom AS | Real estate | 2016 |
| K.H.Helgesen Holding AS | | 2026 |
| K.S.K Altaveien AS | Real estate | 2023 |
| K.S.K Holding Bygg AS | Construction | 2023 |
| K.S.K Myggveien AS | Real estate | 2023 |
| K.S.K. Bygg AS | Construction | 2007 |
| K.Sandnes Maskin AS | Construction | 2016 |
| K2 Multipack AS | Information & communication | 2003 |
| Kada Regnskap AS | Professional & scientific | 1989 |
| Kae Alta AS | Financial services | 2018 |
| Kaffe Frida AS | Hospitality | 2024 |
| Kaino AS | Agriculture & fishing | 2026 |
| Kajal AS | Financial services | 2018 |
| Kalland Invest AS | Financial services | 2011 |
| Kap Alta AS | Financial services | 2018 |
| Kappinvest-Nord AS | Real estate | 1991 |
| Karin Tangen Holding AS | | 2023 |
| Karl Magnus Arnesen AS | | 2021 |
| Karlsen Bygg Da | Construction | 1995 |
| Kautokeino Begravelsesbyrå AS | Other services | 2022 |
| Kayagni AS | Health & social care | 2021 |
| Kemam Holding AS | | 2024 |
| Ken Idar Edvardsen AS | Construction | 2025 |
| Keramikkfamilien AS | Arts & recreation | 2022 |
| Kevin Wærnes AS | Wholesale & retail | 2023 |
| Key to Computer AS | Wholesale & retail | 2000 |
| KGB Entreprenør AS | Administrative & support | 2021 |
| Kgo AS | | 2023 |
| KH Kystfiske AS | Agriculture & fishing | 2022 |
| Ki-Ka-Ma Helse AS | Health & social care | 2014 |
| Kildemo AS | Professional & scientific | 2012 |
| Kilden Alta AS | Wholesale & retail | 2007 |
| Kim Ove Thomassen Maskin AS | Construction | 2023 |
| Kimo AS | Real estate | 2023 |
| Kioholding AS | Manufacturing | 2025 |
| Kirkenes Utbygging AS | Construction | 2012 |
| Kiropraktor Fallsen AS | Health & social care | 2023 |
| Kiropraktor Ingeborg Bråtveit AS | Health & social care | 2022 |
| Kivi's Transport AS | Transport & logistics | 2003 |
| Kivijervi Eiendom AS | Real estate | 2006 |
| Kivijervi Holding AS | Administrative & support | 2019 |
| Kivijervi Utleie AS | Administrative & support | 2023 |
| Kivsi Holding AS | | 2021 |
| KJ Steen Holding AS | Financial services | 2013 |
| Kjeldsberg Eiendom Alta AS | Real estate | 1989 |
| Kjell Åge Holten AS | Manufacturing | 2006 |
| Kjellmann AS | Transport & logistics | 2002 |
| Kjellmann Innovation AS | Professional & scientific | 2024 |
| Kjellmann Invest AS | Professional & scientific | 2021 |
| Kjohansen Holding AS | | 2022 |
| Kjoseng Invest AS | | 2025 |
| Kjøkkendesign Alta AS | Wholesale & retail | 2020 |
| Kletor AS | Administrative & support | 2011 |
| Kleven Anleggsteknikk AS | Administrative & support | 2023 |
| Kleven AS | Construction | 2022 |
| Klinikk Elvebakken AS | Real estate | 2013 |
| Klippoteket AS | Other services | 2023 |
| Klippoteket Øst AS | Other services | 2023 |
| Klistrelappen AS | Professional & scientific | 2023 |
| KM Elektro Alta | Construction | 2024 |
| Knottveien 15 AS | Real estate | 2011 |
| Knudsengården AS | Real estate | 2006 |
| Knutsen Drift AS | Administrative & support | 2022 |
| Kokkejævel AS | Wholesale & retail | 2019 |
| Komplettkurs.No AS | Administrative & support | 2020 |
| Komsa Boliger AS | Real estate | 2021 |
| Komsa Holding AS | Professional & scientific | 2020 |
| Komsa Invest AS | Professional & scientific | 2006 |
| Komsa Regnskap AS | Professional & scientific | 2019 |
| Komsa Smia AS | Real estate | 2013 |
| Komsaveien 22 AS | Real estate | 2011 |
| Komsaveien Eiendom AS | Real estate | 2011 |
| Konseptide AS | Professional & scientific | 2015 |
| Kontor Og Grafisk Alta AS | Wholesale & retail | 1998 |