| Kiriv Invest II AS | | 2023 |
| Kirkeveien 466 AS | Real estate | 2017 |
| Kiserød Eiendom AS | Real estate | 2021 |
| Kistro Holding AS | | 2024 |
| Kivest AS | Financial services | 1996 |
| Kj-Kaos AS | Wholesale & retail | 2013 |
| Kjell Eftedal AS | Wholesale & retail | 1982 |
| Kjelle Ambulansestasjon AS | Real estate | 2018 |
| Kjelle Holding AS | Real estate | 2019 |
| Kjelleparken AS | Real estate | 2015 |
| Kjemiexpressen AS | Wholesale & retail | 2009 |
| Kjerr AS | Financial services | 2005 |
| Kjervelia Holding AS | | 2026 |
| Kjetil Fjære AS | Construction | 2007 |
| Kjetro AS | Professional & scientific | 2015 |
| Kjeve AS | Financial services | 2017 |
| Kjms Eiendom AS | Real estate | 2019 |
| Kjær Gård Holding AS | | 2005 |
| Kjæraas Holding AS | | 2025 |
| Kjærås Holding AS | | 2026 |
| Kjøkken Studio Sandefjord AS | Wholesale & retail | 2022 |
| KK - Eiendom AS | Real estate | 2016 |
| KK Engineering AS | Professional & scientific | 2018 |
| KK Investment AS | Real estate | 2021 |
| Kkvmarine Ltd Nuf | Professional & scientific | 2015 |
| KL Utvikling AS | | 2022 |
| Kl-Bygg AS | Construction | 2019 |
| Klangborg Holding AS | | 2019 |
| Klasen AS | Wholesale & retail | 2022 |
| Klasen Eiendom AS | Real estate | 2025 |
| Klasen Stropp & Kjetting AS | Wholesale & retail | 2011 |
| Klaveness Eiendom AS | Real estate | 2014 |
| Klaveness Footwear AS | Wholesale & retail | 1963 |
| Kleive AS | Information & communication | 2005 |
| Klemmetsmo AS | Construction | 2010 |
| Klettum Ans | Real estate | 1995 |
| Klinestadmoen 13 AS | Real estate | 2017 |
| Klinestadmoen 4 AS | Real estate | 2018 |
| Klinestadmoen 6 AS | Real estate | 2014 |
| Klinestadmoen 9 AS | Real estate | 2005 |
| Klinestadmoen Eiendomsselskap AS | Real estate | 1992 |
| Klinestadskogen Eiendom Ans | Real estate | 2015 |
| Klinikk Daub AS | Other services | 2017 |
| Klinikk Odden AS | Other services | 2025 |
| Klinikk Wiklund AS | Health & social care | 2025 |
| Klippen AS | | 1998 |
| Klonteig Invest AS | | 2022 |
| KLS Salmakeri Og Søm AS | Manufacturing | 2021 |
| KM Anlegg AS | Construction | 2015 |
| KM Dalen Holding AS | | 2019 |
| Knattleikr AS | Arts & recreation | 2026 |
| Knudsrødveien 7 AS | Real estate | 2005 |
| Knut T. Ueland AS | Real estate | 2022 |
| Knut's Miljøservice AS | Water & waste | 2018 |
| Kob Invest AS | Transport & logistics | 2015 |
| Kodax AS | Information & communication | 2025 |
| Koddi Holding AS | | 2024 |
| Koderiet AS | Information & communication | 2017 |
| Kognitek AS | Information & communication | 2022 |
| Kokeriet Eiendom AS | Real estate | 2002 |
| Kokeriet Restaurant AS | Hospitality | 2002 |
| Kokvold Consulting AS | Information & communication | 2008 |
| Koldevin AS | Real estate | 2005 |
| Koliom AS | Wholesale & retail | 2017 |
| Kollen 2 AS | Real estate | 2018 |
| Kollen Bolig AS | Real estate | 2015 |
| Kombieiendom Sandefjord AS | Real estate | 2020 |
| Komek AS | Professional & scientific | 2023 |
| Komhub Holding AS | | 2026 |
| Komhub Solutions AS | Information & communication | 2026 |
| Komplett ASA | Wholesale & retail | 1998 |
| Komplett Distribusjon AS | Wholesale & retail | 2010 |
| Komplett Elektro AS | Construction | 2024 |
| Komplett Pizza AS | Hospitality | 2021 |
| Komplett Services AS | Wholesale & retail | 1998 |
| Komplett Services Sweden AB | Wholesale & retail | 2009 |
| Komplett Tak AS | Construction | 2012 |
| Komplett Utleie AS | Administrative & support | 2016 |
| Komplett VVS Sandefjord AS | Construction | 2012 |
| Konext AS | Information & communication | 2024 |
| Konfetti.No AS | Wholesale & retail | 2019 |
| Kongens Gate 14 AS | Real estate | 2001 |
| Kongens Gate 15 AS | Real estate | 2015 |
| Kongens Gate 24 Sandefjord AS | Real estate | 2018 |
| Kongensgate 16 AS | Real estate | 2005 |
| Kongensgate 17 Invest AS | Real estate | 2007 |
| Kongensgate 21 AS | Real estate | 2006 |
| Kongensgate 3 AS | Real estate | 2012 |
| Kongensgate Frisør Studio AS | Other services | 2015 |
| Kongensgate Tannklinkk AS | Health & social care | 2011 |
| Kongensgt 39 Ans | Real estate | 2005 |
| Kongensgt 7 AS | Real estate | 1996 |
| Kongerødvegen 3 AS | Wholesale & retail | 2009 |
| Konsept K AS | Real estate | 2019 |
| Kontor Og Kaffe AS | Wholesale & retail | 2014 |
| Kopi Partner AS | Manufacturing | 1997 |
| Kora AS | Information & communication | 2023 |
| Korsvik Begravelsesbyrå AS | Agriculture & fishing | 2001 |
| Kosbas Holding AS | | 2020 |
| Kosikk Ix Nord AS | Real estate | 2025 |