| Jeg Og Zinza Da | Information & communication | 2000 |
| Jege Invest AS | | 2015 |
| Jerikoveien 20 AS | Real estate | 2017 |
| Jero AS | | 2023 |
| Jess Invest AS | | 2020 |
| Jfram 207 Holding AS | | 2023 |
| Jingle Jangle Morning AS | Information & communication | 2013 |
| Joggende Optikere Da | Professional & scientific | 2000 |
| Johla Invest AS | Real estate | 2005 |
| John Gullichsen AS | Wholesale & retail | 1994 |
| Jomani Stream AS | Professional & scientific | 2020 |
| Jon Holm Holding AS | Real estate | 2011 |
| Jotoro AS | | 2022 |
| JSG Invest AS | | 2024 |
| Jusi AS | Professional & scientific | 2024 |
| Just Results Consulting AS | Professional & scientific | 2012 |
| Jva Invest AS | Professional & scientific | 2021 |
| K&C Factory AS | Wholesale & retail | 2018 |
| K. Rose Holding AS | Financial services | 2005 |
| Kaha AS | | 2020 |
| Kajo Holding AS | Real estate | 2006 |
| Kalendermaling & Dekor Da | Professional & scientific | 2000 |
| Kalkulatorer & Regnemaskiner Da | Professional & scientific | 2000 |
| Kamaro Invest AS | Real estate | 1998 |
| Kanhus Prosjekt AS | Real estate | 2021 |
| Kariba AS | Professional & scientific | 2014 |
| Kassen AS | Real estate | 2014 |
| Kassma AS | | 2016 |
| KB Dekosenter AS | Wholesale & retail | 2003 |
| KB Management AS | Information & communication | 2005 |
| Key Account Partner AS | Wholesale & retail | 2015 |
| Kihl Invest AS | Professional & scientific | 2008 |
| Kihlproductions AS | | 2015 |
| KILDE1 Capital AS | | 2026 |
| KILDE1 Tech AS | Information & communication | 2026 |
| Kirkeveien Kart Og Miljø Da | Professional & scientific | 2000 |
| Kiropraktor & Helse AS | Health & social care | 1990 |
| Kjelland & Co Prosjektbistand AS | Professional & scientific | 2010 |
| Kjersti Thunstrøm AS | Real estate | 2005 |
| Kjevik Aakre Holding AS | | 2021 |
| KJK AS | Financial services | 2020 |
| Kjoss Holding AS | | 2020 |
| Klassisk Age Da | Professional & scientific | 2000 |
| Klatre Eiendom AS | Real estate | 2013 |
| Kleopatra AS | Wholesale & retail | 2019 |
| Kliklok Corporation | Wholesale & retail | 2008 |
| Klokkeuret Konkurskjøp & Salg Da | Professional & scientific | 2000 |
| Klover Furniture AS | Professional & scientific | 2024 |
| Klubben Gjerder Da | Professional & scientific | 2000 |
| Kneik & Sisu AS | Professional & scientific | 2022 |
| Knivskarpe Langrennski Da | Professional & scientific | 2000 |
| Knudsen Rør AS | Construction | 2016 |
| Kokorebel AS | Professional & scientific | 2023 |
| Konjakk Ball Da | Professional & scientific | 2000 |
| Kopi Lotteri Da | Professional & scientific | 2000 |
| Korshagen 1 Eiendom AS | Real estate | 2012 |
| Korsveien Invest AS | | 2024 |
| Kosmetikkno Da | Wholesale & retail | 1999 |
| Kratter Holding AS | | 2026 |
| Krimani AS | | 2005 |
| Kristinvest AS | | 2019 |
| Kristor AS | Financial services | 2008 |
| Kro Med Vikar Da | Professional & scientific | 2000 |
| Kroksund Eiendom AS | Real estate | 2016 |
| Kryddermuseer Da | Professional & scientific | 2000 |
| Krøsus Rikdom Da | Professional & scientific | 2000 |
| Krüger Kommunikasjon AS | Professional & scientific | 2017 |
| Ku Eller Arkitekter Da | Professional & scientific | 2000 |
| Kukulere Med Takk Da | | 2000 |
| Kuler Krutt Og Kurs Da | Professional & scientific | 2000 |
| Kulturarkiv for Damer Da | Information & communication | 2000 |
| Kundekreditno Da | Professional & scientific | 2000 |
| Kunderadresse Da | Professional & scientific | 2000 |
| Kundereg Da | Information & communication | 2000 |
| Kupp Water Da | Professional & scientific | 2000 |
| Kurumba AS | Information & communication | 2025 |
| Kvaalen Holding AS | | 2021 |
| Kvinge Tvedt AS | | 2025 |
| KWK Holding AS | | 2025 |
| L1G Holding AS | Financial services | 2017 |
| La Maison Des Gardes Da | Real estate | 2010 |
| Lab-Invest AS | Real estate | 2014 |
| Labben Invest AS | Professional & scientific | 1986 |
| Laboratorium Nord AS | | 2021 |
| Labr Utleie AS | Administrative & support | 2024 |
| Labu AS | Financial services | 2004 |
| Labyrint AS | Real estate | 2005 |
| Lae Ventures AS | | 2026 |
| Lager & Labratorie Utstyr Da | Professional & scientific | 2000 |
| Laiko AS | Real estate | 2008 |
| Lakk Og Lukt Laboratorie Da | Information & communication | 2000 |
| Lan Engineering & Projects AS | Professional & scientific | 2018 |
| Lapsen & Co AS | Real estate | 2024 |
| Lapsen AS | Professional & scientific | 2015 |
| Lapsetorvet Invest AS | Real estate | 2014 |
| Lavprisno Da | Administrative & support | 1999 |
| LB Helse AS | Health & social care | 2020 |
| Le Lannio Interiør AS | Construction | 1996 |
| Le Petite Chateau Da | Professional & scientific | 2000 |
| Ledang Invest AS | | 2016 |