| Kanalgata Eiendom AS | Real estate | 2008 |
| Kanalkaia Næringspark AS | Real estate | 1990 |
| Kanda AS | Manufacturing | 1976 |
| Kann Invest AS | | 2025 |
| Kaos Kommunikasjon Da | Information & communication | 2004 |
| Karishei AS | Real estate | 2015 |
| Karma Marit Meløy AS | Wholesale & retail | 2011 |
| Karrierepasset AS | Information & communication | 2026 |
| Kasp Holding AS | Financial services | 2011 |
| Kathrud Eiendom AS | Real estate | 2007 |
| KB Development AS | Professional & scientific | 2016 |
| Kbauto AS | Wholesale & retail | 2024 |
| Kebab Og Bakt Potet Service Da | Hospitality | 2004 |
| Ken Aarsten Transport AS | Real estate | 2004 |
| Ken-Robin Holding AS | Real estate | 2022 |
| Kenans Matverden AS | Hospitality | 2016 |
| Kenneth Svendsen Holding AS | Real estate | 2013 |
| Kiil Invest AS | Real estate | 2000 |
| Kikkopp Holding AS | Administrative & support | 2005 |
| Kilgata 17 AS | Real estate | 2012 |
| Kilgata 19 AS | Real estate | 2012 |
| Kimast AS | Financial services | 2018 |
| Kinserdal Holding AS | | 2024 |
| Kirkegårdsgata 1-3 AS | Real estate | 2017 |
| Kiropraktorhuset AS | Health & social care | 2014 |
| Kisa AS | Construction | 1987 |
| Kite Global AS | Wholesale & retail | 2020 |
| Kjedekontoret AS | Wholesale & retail | 2004 |
| Kjell Hovland AS | Wholesale & retail | 1974 |
| Kjell Lindhjem Eiendom AS | Real estate | 1995 |
| Kjetil Frantzen Holding AS | Real estate | 2021 |
| Kjetil Vestrum Consulting AS | Professional & scientific | 2011 |
| Kji AS | | 2022 |
| Kjær Fiber AS | Construction | 2020 |
| Kjær-Holding AS | | 2022 |
| Kjærskauen AS | Real estate | 2017 |
| Kjøndal Gruppen AS | | 2026 |
| Kjøndal Maskin AS | Agriculture & fishing | 2026 |
| KK Lagerutleie AS | Real estate | 2017 |
| KL Venture AS | | 2026 |
| Klara Larvik AS | Wholesale & retail | 2020 |
| Klart Det! Ambassadør AS | Real estate | 2010 |
| Klart Det! Utleie AS | Wholesale & retail | 2010 |
| Klatresiden AS | Wholesale & retail | 2007 |
| KLB I Dalarna AB | Administrative & support | 2015 |
| Kle Holding AS | | 2022 |
| Kleo Dame Og Herre Frisør AS | Other services | 2004 |
| Klett Consulting AS | Professional & scientific | 2024 |
| Klikkit AS | Information & communication | 2020 |
| Klimatech AS | Construction | 2025 |
| KLT Holding AS | Financial services | 2013 |
| Klæbo S Invest AS | | 2024 |
| Kløtterød Butikkdrift AS | Wholesale & retail | 2021 |
| Kløtterød Holding AS | Wholesale & retail | 2015 |
| Kmrp AS | | 2023 |
| Knardal Consulting AS | Professional & scientific | 2024 |
| Knatten Boligutvikling AS | Real estate | 2021 |
| Kodal Eiendom AS | Real estate | 1995 |
| Kodepar AS | Information & communication | 2024 |
| Koie Arkitektur AS | Professional & scientific | 2025 |
| Kolleksjon AS | Wholesale & retail | 2012 |
| Komma Frisør CM AS | Other services | 2020 |
| Komplett Invest AS | Real estate | 2022 |
| Komplett Montasje AS | Construction | 2012 |
| Komplett Utvikling AS | Real estate | 2019 |
| Kongegata 16 AS | Real estate | 2017 |
| Kongegata 18 AS | Real estate | 1999 |
| Kongegata 19 Larvik AS | Real estate | 2008 |
| Kongegata 20 Larvik AS | Real estate | 2020 |
| Kongegata 23 AS | Real estate | 2025 |
| Kongegata 25 AS | Real estate | 2025 |
| Kongegata 26 B Og C AS | Real estate | 1976 |
| Kongegata 29 Larvik AS | Real estate | 1983 |
| Kongegata 3 Og 3A AS | Real estate | 2019 |
| Kongegt 31 AS | Real estate | 1996 |
| Kongegt. 3 AS | Real estate | 2007 |
| Kongsgård Drift Og Montasje AS | Construction | 2026 |
| Konkylie Data AS | Information & communication | 2021 |
| Kontor Og Datamiljø Ans | | 1990 |
| Kopano AS | Administrative & support | 2021 |
| Korsvikveien AS | Real estate | 2018 |
| Kosmed AS | Health & social care | 2015 |
| Kravo AS | Information & communication | 2026 |
| Kreds Studio AS | Information & communication | 2014 |
| Krey Båtservice AS | Manufacturing | 2021 |
| Krey Eiendom AS | Real estate | 2020 |
| Kroa Thai Takeaway AS | Hospitality | 2023 |
| Krokstad Eiendomsutvikling AS | Real estate | 2017 |
| Kroktun Interiør AS | Wholesale & retail | 2021 |
| Krone Bro Laboratoriet Eiendom AS | Manufacturing | 2007 |
| Krone Bro Laboratoriet Larvik AS | Manufacturing | 1994 |
| Kunnskapssenteret AS | Education | 2025 |
| Kunstguiden Da | Information & communication | 2000 |
| Kur Sauna AS | Administrative & support | 2023 |
| Kurs Advokaten Da | Education | 2022 |
| Kursiv Led & Print AS | Professional & scientific | 2018 |
| Kursiv Skilt & Dekor AS | Professional & scientific | 2001 |
| KV Investments AS | Construction | 2025 |
| KV Tak Og Bygg AS | Construction | 2025 |
| Kvartal 69 Sandefjord AS | Real estate | 1990 |