| KNB AS | Bø I Telemark | 2007 |
| Kne Holding AS | Steinkjer | 2005 |
| Knecht Maschinenbau GmbH | De-88368 Bergatreute | 2022 |
| Knekt AS | Oslo | 2025 |
| Knem Og Næsvik AS | Oslo | 2000 |
| KNK Graveservice AS | Tveit | 2025 |
| Knmh AS | Hidrasund | 2014 |
| Knoph VVS & Gassteknikk AS | Sola | 2002 |
| Knorzer Holding AS | Tveit | 2022 |
| Knu Bygg Og Renovering AS | Høvik | 2019 |
| Knudsen & Aanonsen Ans | Bjorbekk | 1986 |
| Knudsen Drift Og Eiendom AS | Moss | 2014 |
| Knudsen Og Gulbrandsen Bygg AS | Gressvik | 2026 |
| Knudsen Rør AS | Stabekk | 2016 |
| Knudsens Tømrerservice AS | Hylkje | 2021 |
| Knudssøn Invest AS | Oslo | 2005 |
| Knuro AS | Kokstad | 2004 |
| Knusefres AS | Prestfoss | 2022 |
| Knusta AS | Halsa | 2026 |
| Knut & Knot AS | Bryne | 2026 |
| Knut Aarum AS | Trøgstad | 2024 |
| Knut Amund Leirkjær AS | Mandal | 2016 |
| Knut Bjerke AS | Våler I Østfold | 1973 |
| Knut Estensen AS | Skjerstad | 1999 |
| Knut H. Andersen AS | Ridabu | 2005 |
| Knut Hanssen Maskin AS | Drevsjø | 2013 |
| Knut Haugsjå AS | Treungen | 1999 |
| Knut Helgesen & Sønner AS | Moss | 2007 |
| Knut Henriksen AS | Saltnes | 1979 |
| Knut Hjelmeland Holding AS | Dimmelsvik | 2007 |
| Knut Hovet Installasjonar AS | Rysstad | 1990 |
| Knut Ivar Mork AS | Hjelset | 2016 |
| Knut Kleiv AS | Åmotsdal | 1998 |
| Knut Knutsen AS | Bergen | 1992 |
| Knut Langaas AS | Horten | 2006 |
| Knut Lie AS | Oslo | 1971 |
| Knut Lund Rørleggerbedrift AS | Lom | 1996 |
| Knut Malmberg AS | Gjøvik | 1984 |
| Knut Navestad Utleie & Tjenester AS | Skien | 2014 |
| Knut Olav Halland Brøyting Og Graving AS | Rødberg | 2016 |
| Knut Olav Sundland AS | Reinli | 2019 |
| Knut Pinaas Anleggsservice AS | Sarpsborg | 2021 |
| Knut S Løften Maskin AS | Avaldsnes | 2008 |
| Knut Sigurd Haug AS | Rødberg | 2023 |
| Knut Sigve Lillemo AS | Ølensvåg | 2015 |
| Knut Søby AS | Sem | 2021 |
| Knut Ullern AS | Skarnes | 2016 |
| Knut W Finsand JR Entreprenørforretning AS | Berger | 1994 |
| Knut's Montasje AS | Stavanger | 2013 |
| Knut-Arne Rugsland AS | Birkeland | 2022 |
| Knuten Og Ausel Invest AS | Vegårshei | 2021 |
| Knutsen Bygg AS | Roa | 2004 |
| Knutsen Bygg Og Eiendom AS | Stavanger | 2013 |
| Knutsen Bygg Og Innredning AS | Evenskjer | 2023 |
| Knutsen Holding AS | Oslo | 2016 |
| Knutsen Mold Og Basse AS | Førresfjorden | 2005 |
| Knutsen Service & Anlegg AS | Lysekloster | 2023 |
| Knutshaug VVS AS | Trondheim | 2017 |
| Knutson Invest AS | Kristiansand S | 2013 |
| Knutssons Bygg Och Design Nuf | Se-831 36 Östersund | 2024 |
| Knutsvik Drift AS | Stavanger | 2023 |
| Knutsvik Holding AS | Stavanger | 2022 |
| Knuva Bygg AS | Trondheim | 2022 |
| Knygen AS | Vanse | 2014 |
| Knørr Entreprenør AS | Heidal | 2024 |
| Ko Bygg AS | Ålgård | 2026 |
| Ko Bygg Og Interiør AS | Ranheim | 2018 |
| Ko Finans AS | Stord | 2008 |
| Ko-As AS | Lillesand | 2019 |
| Kobber Og Blikk Service AS | Stokke | 2013 |
| Kobber- Og Blikkenslagerverksted Torbjørn Lemtun AS | Grålum | 2020 |
| Kobtas AS | Trondheim | 2019 |
| Kobygg AS | Trondheim | 2021 |
| Koc Piotr - Usl. Budowlane | 14-202 Ilawa | 2006 |
| Koch Maschinenbau GmbH | De-18519 Sundhagen | 2025 |
| Kod Eiendom AS | Dalekvam | 2017 |
| Kodal Blikk AS | Kodal | 2006 |
| Kodal Bygg AS | Kodal | 2024 |
| Kodal Maskin AS | Kodal | 2016 |
| Kodumaja | Ee-50411 Tartu Maakond | 2020 |
| Koem AS | Jevnaker | 2019 |
| Kog Anlegg AS | Vågå | 2015 |
| Kohi Byggpartner AS | Åmot | 2024 |
| Koht & Sønner AS | Skibotn | 2014 |
| Koie Living AS | Stranda | 2015 |
| Koier Bygg AS | Oslo | 2022 |
| Koj Holding AS | Volda | 2008 |
| Kojair Tech OY | Fi-35700 Vilppula | 2013 |
| Kojo AS | Jonsvatnet | 1991 |
| Kokkedals Tømreren Aps | Dk-9631 Gedsted | 2014 |
| Kokkedals Tømreren Norge Nuf | Dk-9631 Gedsted | 2013 |
| Kol Holding AS | His | 2005 |
| Kolasa Bygg Service AS | Breistein | 2021 |
| Kolb HSW GmbH & Co.Kg | De-56479 Neunkirchen | 2020 |
| Kolbein AS | Kjølsdalen | 2014 |
| Kolbein Klette Anlegg AS | Voss | 2025 |
| Kolbjørn Frøseth AS | Spongdal | 2020 |
| Kolbjørn Nilsskog AS | Mosjøen | 1995 |
| Kolbjørn Olsen AS | Bardufoss | 1986 |
| Kolbjørn Pedersen Eftf AS | Brekstad | 2012 |