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| Kompetansesenteret for Robotteknologi AS | Lonevåg | 2024 |
| Kompetansetorget AS | Oslo | 2009 |
| Kompetanseunion A/S | Oslo | 1988 |
| Kompetanseutvikling Helgeland AS | Sandnessjøen | 2017 |
| Kompleet Bygning & Inventar | Dk-2300 København S | 2016 |
| Komplett HMS AS | Bergen | 2017 |
| Komplett Hulltaking AS | Sofiemyr | 2026 |
| Komplett Prosjektering AS | Verdal | 2012 |
| Komplett Regnskap AS | Haugesund | 1983 |
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| Komplett Regnskap Tromsø AS | Tromsdalen | 2014 |
| Komplett Revisjon AS | Hønefoss | 2019 |
| Komplett Økonomi AS | Vigrestad | 2008 |
| Komplink AS | Vingrom | 2025 |
| Komposittplank AS | Barkåker | 2007 |
| Komposium Utvikling AS | Horten | 2016 |
| Komsa Holding AS | Alta | 2020 |
| Komsa Invest AS | Alta | 2006 |
| Komsa Regnskap AS | Alta | 2019 |
| Komsol Stockholm AB | Se-194 61 Upplands Väsby | 2019 |
| Komsult AS | Kristiansand S | 2023 |
| Komtek AS | Moss | 1995 |
| Konab AS | Stavanger | 2005 |
| Konane Invest AS | Tromsø | 2021 |
| Konbo AS | Voss | 2025 |
| Konbygg AS | Valderøya | 1997 |
| Koncav AS | Hafrsfjord | 2017 |
| Kone Elevators Ltd | Fi-05801 Hyvinkaa | 2012 |
| Kone Og Mann AS | Eiksmarka | 2024 |
| Konecranes Port Services GmbH Nuf | De-40597 Düsseldorf | 2025 |
| Konferanse- Og Mediaspesialisten AS | Jessheim | 2018 |
| Konform Holding AS | Haugesund | 2013 |
| Konfér AS | Oslo | 2022 |
| Kong Inge AS | Trondheim | 2017 |
| Kong Kurs AS | Stavanger | 2013 |
| Kongel AS | Rendalen | 2021 |
| Kongelf Media AS | Trollåsen | 2016 |
| Kongensgate 14 - 18 AS | Oslo | 2005 |
| Kongkav AS | Mo I Rana | 2023 |
| Kongle Kompetanse AS | Haugesund | 2016 |
| Konglomeratet Da | Heidal | 2003 |
| Kongresspartner AS | Berger | 2008 |
| Kongsberg Advokatkontor AS | Kongsberg | 1997 |
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| Kongsberg Dyreklinikk AS | Kongsberg | 2006 |
| Kongsberg E-Lon AS | Kongsberg | 2001 |
| Kongsberg Energy Systems AS | Kongsberg | 2021 |
| Kongsberg Innovasjon AS | Kongsberg | 2002 |
| Kongsberg Klyngen AS | Kongsberg | 1999 |
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| Kongsberg Maritime Inc | Us-Houston Tx 77041 | 2016 |
| Kongsberg Maritime Poland SP. Z O.O | Pl-71-717 Szczecin | 2017 |
| Kongsberg Multipurpose Valves AS | Kongsberg | 2010 |
| Kongsberg Naval Services AS | Godvik | 2022 |
| Kongsberg Precision Cutting Systems AS | Kongsberg | 1988 |
| Kongsberg Prosjektservice AS | Kongsberg | 2011 |
| Kongsberg Regnskapstjenester AS | Kongsberg | 2011 |
| Kongsberg Safety Systems AS | Oppegård | 2005 |
| Kongsberg Tox Removal AS | Kongsberg | 2023 |
| Kongsberg Veterinærkontor AS | Kongsberg | 2008 |
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| Kongshavn Design AS | Bergen | 2007 |
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| Kongsli Wikran AS | Vikran | 2024 |
| Kongspow AS | Kongsvinger | 2021 |
| Kongstein AS | Kokstad | 2016 |
| Kongsvarden AS | Heimdal | 2004 |
| Kongsvik Consulting AS | Sandnes | 1997 |
| Kongsvinger Automation AS | Oslo | 2013 |
| Kongsøre Productions AS | Oslo | 2021 |
| Konjakk Ball Da | Stabekk | 2000 |
| Konkor AS | Vassøy | 2023 |
| Konkord Film AS | Rygge | 2026 |
| Konkret Support AS | Hønefoss | 2008 |
| Konkurransekraft AS | Oslo | 1985 |
| Konkylien AS | Konsvikosen | 2018 |
| Konmor AS | Fredrikstad | 2012 |
| Konnexus Advokatfirma AS | Ålesund | 2020 |
| Konnichiwa AS | Oslo | 2017 |
| Kono Invest AS | Billingstad | 2005 |
| Konos AS | Trondheim | 2016 |
| Konotori AS | Oslo | 2026 |
| Konrad Kan AS | Bryne | 2009 |
| Konrad Kittelsen AS | Røyneberg | 2013 |
| Konse AS | Oslo | 2026 |
| Konsel AS | Oslo | 2019 |
| Konsept Boligstyling AS | Fjellhamar | 2023 |
| Konsept Media AS | Indre Arna | 2018 |
| Konsepta AS | Bergen | 2013 |
| Konseptet AS | Billingstad | 2001 |
| Konsepthus AS | Nesodden | 2018 |
| Konseptide AS | Alta | 2015 |
| Konseptinvest AS | Tønsberg | 2021 |
| Konseptkontoret AS | Kristiansand S | 2019 |
| Konseptpikene Da | Oslo | 2004 |
| Konsern AS | Nesoddtangen | 2017 |
| Konsernsupport AS | Godvik | 2016 |