| KRG Vakthold AS | Kristiansand S | 2013 |
| Krigu AS | Kristiansand S | 2017 |
| Krimkampen AS | Oslo | 2016 |
| Krimol AS | Oslo | 2020 |
| Krine AS | Oslo | 2025 |
| Kristian Borgen AS | Lepsøy | 2012 |
| Kristian Olde Brekke AS | Voss | 2019 |
| Kristian Røsok AS | Molde | 2013 |
| Kristiania Renhold AS | Oslo | 1997 |
| Kristiansand Boligservice AS | Kristiansand S | 2024 |
| Kristiansand Eksport Import AS | Kristiansand S | 2003 |
| Kristiansand Event AS | Kristiansand S | 2014 |
| Kristiansen Multiservice AS | Stokmarknes | 2017 |
| Kristiansen Racing AS | Grua | 2026 |
| Kristiansen Renhold AS | Nittedal | 2026 |
| Kristiansund Renhold AS | Kristiansund N | 2021 |
| Kristina's Renhold AS | Åsnes Finnskog | 2022 |
| Kristoffersen Bil Bilutleie AS | Stjørdal | 1997 |
| Krogevoll Service AS | Tau | 2021 |
| Kroglia Kulturgård AS | Storforsheia | 2014 |
| Krohn Pyroteknikk AS | Molde | 2002 |
| Krohn-Olsen AS | Sandefjord | 2005 |
| Krohne Messtechnik GmbH | De-47058 Duisburg | 2024 |
| Kroken Sauna AS | Lillehammer | 2020 |
| Kroken Varebil AS | Fyllingsdalen | 2024 |
| Krokkasser Utleie AS | Ringebu | 2016 |
| Krokseng AS | Bardu | 2012 |
| Kronberget AS | Vestre Gausdal | 2019 |
| Krone Fleet A/S Nuf | Dk-6330 Padborg | 2015 |
| Krone Fleet Danmark A/S Nuf | Dk-6300 Padborg | 2025 |
| Kronen Facility Management AS | Sandnes | 1997 |
| Kronen Finans AS | Stavanger | 2020 |
| Krop AS | Søgne | 2014 |
| Krosty AS | Vollen | 1991 |
| KRS Live AS | Kristiansand S | 2025 |
| Kru Holding AS | Drammen | 2016 |
| Krudtverket AS | Raufoss | 2017 |
| Krusen Agrochemistry Norway AS | Fornebu | 2022 |
| Krypton Film AS | Oslo | 2009 |
| Krypton Holding AS | Oslo | 2009 |
| Krystall Renhold AS | Askim | 2025 |
| Krystallen Vaktmestertjenester AS | Fåvang | 2025 |
| Kråko Hytteservices AS | Fitjar | 2022 |
| Kråksetdalen SA | Skaun | 2024 |
| Krøk AS | Oslo | 2021 |
| KS AS Skagen Hotellbygg | Stavanger | 1986 |
| Ks-Maskiner AS | Evje | 2022 |
| Ks-Maskinutleie AS | Støren | 2020 |
| Ks-Møteplasser AS | Oslo | 2022 |
| KSB Design Company S.R.L | Mehedinti County | 2015 |
| Kseng Limited | Didcot Ox11 9Ls | 2012 |
| KSK Autopark AS | Trondheim | 2023 |
| Kso Invest AS | Ålesund | 2024 |
| KST Materiell AS | Hokksund | 2024 |
| KT Structural Design & Construction Services Ltd | Cheshire Sk4 4Hr | 2011 |
| KTB Consulting AS | Os | 2018 |
| KTD Solution AS | Tiller | 2024 |
| KTS People Eesti Ou Nuf | Ee-74001 Harjumaa | 2025 |
| KTS Ulefoss Eiendom AS | Ulefoss | 2020 |
| KTV Group Agder AS | Kongshavn | 2024 |
| KTV Group AS | Hauglandshella | 2003 |
| KTV Group Troms Og Finnmark AS | Tromsø | 2024 |
| KTV Group Øst AS | Gjerdrum | 2022 |
| KTV Holding AS | Hauglandshella | 2023 |
| Kuantum AS | Loddefjord | 2016 |
| Kuba Ans | Lom | 2007 |
| Kube Energy AS | Oslo | 2016 |
| Kubikk Norge AS | Laksevåg | 2015 |
| Kuenz-Sk S.R.O. | Sk-04458 Kechnec | 2022 |
| Kuhle Opplevelser AS | Nesøya | 2022 |
| Kulant AS | Fagernes | 2019 |
| Kultur I Hagan AS | Sandefjord | 2017 |
| Kultur Landsbyer AS | Oslo | 2001 |
| Kulturarv Lofoten AS | Sund I Lofoten | 2015 |
| Kulturell Dialog Da | Oslo | 1999 |
| Kulturfangst AS | Fredrikstad | 2016 |
| Kulturfergen AS | Bergen | 2017 |
| Kulturgardar I Gudbrandsdalen SA | Tessanden | 2002 |
| Kulturhav AS | Vassøy | 2024 |
| Kulturhuset Tannlegesenter Da | Grimstad | 2020 |
| Kulturkompaniet AS | Stavanger | 2025 |
| Kulturoperatørene AS | Bergen | 2007 |
| Kulturstasjonen AS | Kragerø | 2022 |
| Kultursupport AS | Sandefjord | 1997 |
| Kulturvikarene AS | Fjellhamar | 2026 |
| Kulturværste Produksjoner Da | Fredrikstad | 2026 |
| Kundelink Da | Geithus | 2026 |
| Kunst & Verdiforedling AS | Oslo | 2013 |
| Kunstgavekortet AS | Kristiansand S | 2024 |
| Kunzels Hage AS | Lierstranda | 2024 |
| Kuoni Group Travel Experts | De-60314 Frankfurt Am Main | 2014 |
| Kur Sauna AS | Larvik | 2023 |
| Kurata AS | Sirevåg | 2026 |
| Kurativ AS | Oslo | 2025 |
| Kurs Og Kongresservice AS | Oppdal | 1997 |
| Kurt Bye AS | Steinkjer | 2000 |
| Kurt Skovsted Nielsen | Nakhon Ratchasima Province 30000 | 2014 |
| Kutoppen AS | Bøverbru | 2023 |
| Kva Er AS | Raudeberg | 2024 |
| Kvaase Maskin & Service AS | Høvåg | 2026 |