| JMR Industries AS | Wholesale & retail | 2010 |
| JMS Engros AS | Wholesale & retail | 2026 |
| Jobbsys.No AS | Administrative & support | 1998 |
| Jodi AS | Professional & scientific | 2017 |
| Joga Invest AS | Real estate | 2017 |
| Johal Invest AS | | 2024 |
| Johan Aanerud AS | Other services | 2024 |
| Johannessen Eiendomsmegling AS | Real estate | 2012 |
| John Erik Persson AS | Real estate | 2005 |
| Jojo Consult AS | Professional & scientific | 1999 |
| Jordbærpikene Tønsberg AS | Hospitality | 2008 |
| Jordens Arv AS | Manufacturing | 2022 |
| Jory AS | Professional & scientific | 2000 |
| Jostein Kapital AS | Construction | 2018 |
| Josturamo Holding AS | Real estate | 2021 |
| JP Holdings AS | | 2026 |
| JPS Invest AS | | 2005 |
| JR Group AS | Wholesale & retail | 2017 |
| JR Service AS | Manufacturing | 2017 |
| JR Teknikk AS | Wholesale & retail | 2017 |
| Jra Holding AS | Real estate | 2005 |
| JS Play Lab AS | Wholesale & retail | 2024 |
| JSM Gruppen AS | | 2025 |
| Judi Nails AS | Other services | 2017 |
| Julies Kjøkken AS | Wholesale & retail | 2012 |
| Juliussen Trafikkskole AS | Education | 1986 |
| JV Flow F-01 AS | Transport & logistics | 2026 |
| JV Flow F-02 AS | Transport & logistics | 2026 |
| JV Flow F-04 AS | Transport & logistics | 2026 |
| JV Flow F-10 AS | Professional & scientific | 2026 |
| JWG Holding AS | Wholesale & retail | 2005 |
| Jægervik AS | Administrative & support | 2022 |
| Jørgen Frandsen AS | Professional & scientific | 2015 |
| Jørn Ludahl Invest AS | Information & communication | 2005 |
| K E Petterson Holding AS | | 2007 |
| K2 Kompetanse AS | Education | 2018 |
| K28 Invest AS | Professional & scientific | 2021 |
| Kaa Holding AS | Financial services | 2005 |
| Kaada Invest AS | Health & social care | 2005 |
| Kaalsaas Eiendom AS | Real estate | 1930 |
| Kaalsaas Invest AS | Financial services | 2005 |
| Kaase Bygg AS | Construction | 2022 |
| Kaase Invest AS | Construction | 2015 |
| Kab Holding AS | Wholesale & retail | 2017 |
| Kaigaten 2 AS | Real estate | 2014 |
| Kaiso AS | Health & social care | 2019 |
| Kaldnes AS | Real estate | 1998 |
| Kaldnes Brygge AS | Real estate | 1994 |
| Kaldnes Brygge Mat AS | Wholesale & retail | 2008 |
| Kaldnes Eiendom AS | Real estate | 2007 |
| Kaldnes Holding AS | Real estate | 2000 |
| Kaldnes K2 AS | Real estate | 2007 |
| Kaldnes K5 AS | Real estate | 2007 |
| Kaldnes K6 AS | Real estate | 2007 |
| Kaldnes Kontorbygg AS | Real estate | 2011 |
| Kaldnes Media AS | Information & communication | 2013 |
| Kaldnes Pizza AS | Hospitality | 2017 |
| Kaldnes Utvikling AS | Real estate | 2017 |
| Kaldnes Vekst AS | Real estate | 2022 |
| Kaldnes Vest AS | Real estate | 2007 |
| Kammegaten 1 AS | Real estate | 2005 |
| Kammegaten 5 AS | Real estate | 2025 |
| Kanalbrygga Eiendom AS | Real estate | 2006 |
| Kantdesign Norge AS | Construction | 2024 |
| Kaos Ek AS | Arts & recreation | 2021 |
| Kaotiske Investeringer AS | Professional & scientific | 2024 |
| Kapadokya Restaurant Tønsberg AS | Hospitality | 2017 |
| Kapelowa Da | Real estate | 1994 |
| Kappeland AS | Real estate | 2017 |
| Kapstad AS | Wholesale & retail | 1996 |
| Kapstad Holding AS | Professional & scientific | 2009 |
| Kardiologi AS | Health & social care | 2019 |
| Kari Helene Bugge AS | Health & social care | 2014 |
| Kariodden AS | Real estate | 1997 |
| Karo-Vent AS | Professional & scientific | 2022 |
| Karoline Mote AS | Wholesale & retail | 2012 |
| Kastebekken Holding AS | Financial services | 2005 |
| Katamara AS | Information & communication | 2021 |
| Kattas Figurteater AS | Arts & recreation | 2020 |
| KB Arkitekter AS | Professional & scientific | 2000 |
| KBH Hytter AS | Real estate | 2012 |
| Kbs-Ent AS | Health & social care | 2009 |
| Kebabhouse Tønsberg AS | Hospitality | 2026 |
| Kenny's Retail Group AS | Wholesale & retail | 2026 |
| Kg-Holding AS | Other services | 2024 |
| Khaos Holding AS | Administrative & support | 2020 |
| Ki Premium AS | Real estate | 2026 |
| Ki-Tech Import Ans | Wholesale & retail | 1999 |
| Ki-Tech Service Ans | Professional & scientific | 1999 |
| Kihlberg Stål AS | Real estate | 1983 |
| Kilden Bowling AS | Arts & recreation | 2010 |
| Kilen Bilpleie Da | Other services | 1994 |
| Kilen Eiendomsselskap AS | Real estate | 1990 |
| Kilen Legekontor Tønsberg Da | Health & social care | 2025 |
| Kilen Mat AS | Wholesale & retail | 2015 |
| Kilengaten 10 AS | Real estate | 1995 |
| Kilengaten 17 AS | Real estate | 2009 |
| Kilengaten 25 AS | Real estate | 1971 |
| Kilengaten 2A-6 AS | Real estate | 2019 |
| Kilengt. 31 AS | Real estate | 2005 |