| Kone Aksjeselskap | Oslo | 1973 |
| Kone Hissit OY | Fi-00401 Helsinki | 2011 |
| Kone Lifti Latvija Sia | Lv-1006 Riga | 2013 |
| Konecranes Finland OY Nuf | Fi-05830 Hyvinkää | 2024 |
| Kong Fredrik AS | Gamle Fredrikstad | 2021 |
| Kong Krete AS | Moss | 2019 |
| Kongekrabben Av Kongsfjord AS | Kongsfjord | 2007 |
| Kongelige Gulv AS | Aurskog | 2021 |
| Kongerslev El Aps Nuf | Dk-9293 Kongerslev | 2025 |
| Kongeveien 79 AS | Horten | 2011 |
| Kongsbakken Entreprenør Nuf | Hedalen | 2006 |
| Kongsberg Anlegg AS | Kongsberg | 2023 |
| Kongsberg Belegningsstein AS | Kongsberg | 2006 |
| Kongsberg Betongsaging AS | Kongsberg | 2005 |
| Kongsberg Eiendomsselskap Holding AS | Kongsberg | 2014 |
| Kongsberg Entreprenør AS | Skollenborg | 2005 |
| Kongsberg Glasservice AS | Kongsberg | 2026 |
| Kongsberg Husmaling AS | Kongsberg | 2020 |
| Kongsberg Maling Og Vedlikehold AS | Kongsberg | 2007 |
| Kongsberg Maritime Limited | Aberdeen, Ab32 6Fe Scotland | 2000 |
| Kongsberg Maskindrift AS | Skollenborg | 2020 |
| Kongsberg Sandforretning AS | Kongsberg | 1988 |
| Kongsberg Varmepumpe AS | Kongsberg | 2023 |
| Kongsberghus AS | Kongsberg | 2007 |
| Kongsbygg AS | Kongsvinger | 2018 |
| Kongsgård Bygg AS | Kristiansand S | 2019 |
| Kongsgård Drift Og Montasje AS | Larvik | 2026 |
| Kongsgård Utemiljø AS | Kristiansand S | 2019 |
| Kongshaug Maskin AS | Averøy | 2024 |
| Kongshavn Automasjon AS | Godvik | 2005 |
| Kongsli AS | Vinstra | 2026 |
| Kongsvegen 64 AS | Leira I Valdres | 2012 |
| Kongsvinger Brønn & Energiboring AS | Bruvoll | 2019 |
| Kongsvold Eiendom AS | Notodden | 2025 |
| Kongtorp Holding AS | Bjørkelangen | 2017 |
| Konkret Entreprenør AS | Konsmo | 2019 |
| Konkret Holding AS | Konsmo | 2020 |
| Konnerud Blikk AS | Drammen | 1993 |
| Konnerud Byggservice AS | Drammen | 2013 |
| Konnerud Mur Og Flis AS | Drammen | 2020 |
| Konnerud Rørleggerbedrift AS | Drammen | 2024 |
| Konnerud Rørservice AS | Drammen | 2024 |
| Konrad Knoblauch GmbH | De-88677 Markdorf | 2006 |
| Konrad Nilsen Rørleggerfirma AS | Stavanger | 1984 |
| Konrad Og Company AS | Hvasser | 2021 |
| Konsept Betong AS | Nykirke | 2020 |
| Konsept Bolig AS | Porsgrunn | 2022 |
| Konsept Byggservice AS | Fjellhamar | 2022 |
| Konsept Malerservice AS | Oslo | 2014 |
| Konsept Mur & Flis AS | Drøbak | 2018 |
| Konsepthjem AS | Haslum | 2020 |
| Konsernet Mortensen AS | Lier | 2005 |
| Konserva AS | Strømmen | 2026 |
| Konst Allservice AS | Skjervøy | 2019 |
| Konstantbygg AS | Oslo | 2016 |
| Konstra AS | Oslo | 2021 |
| Konstruksjonsgruppen AS | Bergen | 2023 |
| Konstruktionsbüro Eduard Majic | De-88255 Baindt | 2026 |
| Konstruktiv AS | Oslo | 2020 |
| Konstrukton AS | Oslo | 2023 |
| Konstruktor Tomasz Kaczmarek | Pl-70-655 Szczecin | 2019 |
| Konsulent Gunnar Pedersen AS | Oslo | 1992 |
| Konsvik Maskin AS | Konsvikosen | 2022 |
| Konsvikbygg AS | Konsvikosen | 2023 |
| Kontakt El-Installasjon AS | Oslo | 2000 |
| Kontakt Elektro AS | Aurskog | 2022 |
| Kontaktene Holding AS | Oslo | 2020 |
| Kontex Gruppenee | Ee-11616 Harjumaa | 2019 |
| Kontor Og Boliggulv AS | Sandnes | 1998 |
| Kontraktor AS | Hosle | 2010 |
| Kontroll Og Sikkerhet AS | Brumunddal | 2023 |
| Kontrollgruppen Bygg AS | Sjetnemarka | 2012 |
| Koo Holding AS | Olden | 2017 |
| Kope Holding AS | Dalsgrenda | 2017 |
| Kopec Takservice AS | Drammen | 2025 |
| Kopper Og Blikkenslagermester Terje W Granstrøm AS | Halden | 2001 |
| Koppernes Bygg AS | Austefjorden | 2017 |
| Kopperud Bygg Invest AS | Sandvika | 2012 |
| Kopperud Entreprenør AS | Rømskog | 2006 |
| Kopperud Murtnes Bygg AS | Rakkestad | 1992 |
| Korcyl Team AS | Oslo | 2025 |
| Koren Sprengningsservice AS | Skaun | 1982 |
| Korent AS | Vanvikan | 2020 |
| Korgen Maskin & Transport AS | Korgen | 2023 |
| Kornel's Malerservice AS | Sarpsborg | 2020 |
| Kornelia Hydro-Servis AS | Hokksund | 2021 |
| Kornrud Holding AS | Helle | 2014 |
| Korrekt Bygg AS | Stavanger | 2025 |
| Korsberg Innovation Holding AS | Molde | 2019 |
| Korsfur Bygg AS | Skudeneshavn | 2012 |
| Korsvoll Maskin AS | Dovre | 2011 |
| Korsvoll Rørservice AS | Oslo | 2019 |
| Kortesita Nuf | 03110 | 2021 |
| Kos Utvikling AS | Kongsvinger | 2022 |
| Kosberg Entreprenør AS | Rennebu | 2024 |
| Koselige Hus AS | Trondheim | 2017 |
| Kosi Holding AS | Straume | 2005 |
| Kosinus AS | Oslo | 2004 |
| Kosior AS | Furnes | 2021 |
| Kosmo Bygg Og Anlegg AS | Valnesfjord | 2020 |