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| Kirkerød Engineering AS | Strømmen | 2024 |
| Kirkestien Consulting AS | Drammen | 2019 |
| Kirkestien Invest AS | Drammen | 2005 |
| Kirkeveien 226 Ans | Nesøya | 2004 |
| Kirkeveien Kart Og Miljø Da | Stabekk | 2000 |
| Kirkhill Geosciences Ltd | Aberdeenshire Ab36 8Ux Scotland | 2012 |
| Kiro Kompetanse AS | Slemmestad | 2004 |
| Kiroh AS | Rykkinn | 2018 |
| Kiropets AS | Stjørdal | 2016 |
| Kirper AS | Oslo | 2020 |
| Kirsjo AS | Oslo | 2021 |
| Kirsten I. Husebø AS | Sandnes | 2022 |
| Kirsti Mæland AS | Holter | 2024 |
| Kiru AS | Ånstad | 2026 |
| Kiryd AS | Kristiansand S | 2019 |
| Kis Engeneering & Construction Nordic Aps | Dk-8410 Rønde | 2021 |
| Kise Kommunikasjon AS | Bekkestua | 2017 |
| Kiserud Byggkonsult AS | Kurland | 2020 |
| Kisoomi AS | Oslo | 2020 |
| Kiss Holding AS | Jessheim | 2019 |
| Kistefos Financial Advisors AS | Oslo | 2022 |
| Kistler Nordic AB Nuf | Barkåker | 2026 |
| Kit Interiørarkitektur AS | Ski | 2016 |
| Kitchen Consulting AS | Fetsund | 2018 |
| Kitchlift AS | Oslo | 2013 |
| Kite Holding AS | Kolbotn | 2015 |
| Kitemill AS | Voss | 2008 |
| Kitewall AS | Voss | 2026 |
| Kitsune Arkitekter AS | Oslo | 2015 |
| Kittelsen Eiendom AS | Oslo | 2005 |
| Kitty Og Cato Invest AS | Oslo | 2005 |
| Kitz Tectrade Anlagentechnik GmbH | At-6370 Kitzbühel | 2025 |
| Kive AS | Oslo | 2016 |
| Kivikoski AS | Oslo | 2012 |
| Kivle Konsulent AS | Seljord | 2025 |
| Kivora AS | Ås | 2026 |
| Kiwa AS | Oslo | 1996 |
| Kiwa Certification AB Nuf | Se-170 07 Solna | 2023 |
| Kiwa Holding AS | Oslo | 1987 |
| Kiwa Kompetanse AS | Oslo | 2020 |
| Kiwa Sweden AB Nuf | Se-170 07 Solna | 2006 |
| Kix AS | Kristiansand S | 2020 |
| Kixari AS | Oslo | 2021 |
| Kizu AS | Trondheim | 2018 |
| Kizuna Consulting AS | Hamresanden | 2024 |
| KJ Consulting AS | Trondheim | 2025 |
| KJ Elementdesign AS | Fetsund | 2012 |
| KJ Finans AS | Vassenden | 2024 |
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| KJ Management AS | Tromsø | 2023 |
| KJ Subsea Limited | Suffolk Nr32 2Hd | 2019 |
| KJ Utvikling AS | Kristiansund N | 2025 |
| Kjartan Skjelde Brands AS | Stavanger | 2020 |
| KJB Invest AS | Tromsdalen | 2011 |
| Kjbp Invest AS | Jessheim | 2018 |
| Kjedekollisjon AS | Gressvik | 2016 |
| Kjeldsberg Boligforvaltning AS | Trondheim | 2007 |
| Kjeldsen & Svingen Ans | Stjørdal | 1999 |
| Kjell Arne Haugland Holding AS | Stavanger | 2007 |
| Kjell Arne Jøingsli AS | Nordberg | 2019 |
| Kjell Brustad AS | Skedsmokorset | 2002 |
| Kjell Eliassen AS | Kristiansand S | 1998 |
| Kjell Fjell AS | Arendal | 2014 |
| Kjell Fylkesnes Holding AS | Stord | 2018 |
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| Kjell Haver Regnskapsservice AS | Sandnes | 1988 |
| Kjell Høy-P AS | Oslo | 2017 |
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| Kjell Kalleklev Management AS | Bergen | 2010 |
| Kjell Karlsen Kontrollforretning AS | Gamle Fredrikstad | 1992 |
| Kjell Ove Breivik AS | Brattholmen | 2018 |
| Kjell Tokvam AS | Flåm | 1992 |
| Kjell Viken AS | Beitostølen | 2012 |
| Kjell Ystgård AS | Inderøy | 2011 |
| Kjelland & Co Prosjektbistand AS | Stabekk | 2010 |
| Kjeller & Co AB | 12746 Skärholmen | 2007 |
| Kjeller Innovasjon AS | Lillestrøm | 1995 |
| Kjellesvik Reservoir Management Services AS | Asker | 2005 |
| Kjellin Consulting & Services AS | Harstad | 2022 |
| Kjellmann Innovation AS | Alta | 2024 |
| Kjellmann Invest AS | Alta | 2021 |
| Kjelloye AS | Stavanger | 2023 |
| Kjellsby Holding AS | Oslo | 2018 |
| Kjelltech Invest AS | Stavanger | 2012 |
| Kjellviga Ingeniørsenter AS | Grimstad | 1989 |
| Kjelsberg AS | Åsvang | 2005 |
| Kjelseth Rekruttering & Rådgivning AS | Harstad | 2005 |
| Kjelsrud AS | Kråkerøy | 2019 |
| Kjelsås Byggservice AS | Oslo | 2023 |
| Kjelsåsfotografen AS | Oslo | 2020 |
| Kjem AS | Heimdal | 2011 |
| Kjemad AS | Ålgård | 2014 |
| Kjempefint AS | Oslo | 2015 |
| Kjemperud AS | Drammen | 2013 |
| Kjen AS | Hundvåg | 2008 |
| Kjenner Utvikling AS | Solbergelva | 2026 |
| Kjeps AS | Skien | 2013 |
| Kjerag Labs AS | Ski | 2024 |
| Kjernegjengen AS | Sandnes | 2014 |