| Jordans Parkett AS | Construction | 2019 |
| Jordbærpikene Byporten AS | Hospitality | 2025 |
| Jordbærpikene Lambertseter AS | Hospitality | 2010 |
| Jordbærpikene Storo AS | Hospitality | 2010 |
| Jordbærpikene Tveita AS | Hospitality | 2011 |
| Jordbærvika AS | | 2026 |
| Jordconsult AS | Information & communication | 2023 |
| Jorde Holding AS | | 2018 |
| Jorde Sandsør AS | Financial services | 2005 |
| Jorden Kaller AS | | 2023 |
| Jordet Elektro AS | Construction | 2006 |
| Jordet Invest AS | Other services | 2013 |
| Jordnært AS | Information & communication | 2026 |
| Jordnært Press Da | Professional & scientific | 2010 |
| Jordplan AS | Information & communication | 2010 |
| Jordplan Norway AS | Professional & scientific | 2023 |
| Jore & Williksen Da | Wholesale & retail | 2005 |
| Jorg Holding AS | | 2023 |
| Jorge Holding AS | | 2024 |
| Jorges Musikk AS | Wholesale & retail | 1991 |
| Jorin Holding AS | | 2026 |
| Jorma Elo / Elo Productions | Arts & recreation | 2009 |
| Jormun Mapping AS | | 2026 |
| Joro AS | | 2020 |
| Joro Holding AS | Real estate | 2014 |
| Jorund Forvaltning AS | Real estate | 2008 |
| Jorunn Krokeide AS | Education | 2020 |
| Joryd & Eide AS | Financial services | 2012 |
| Jos Capital AS | Real estate | 2022 |
| Josceefa Norge AS | Education | 2025 |
| Jose 1 Limited | Real estate | 2022 |
| Jose Invest AS | Real estate | 2014 |
| Josef Flis Og Mur AS | Construction | 2025 |
| Josef Gartner & Co Nederland N V | Construction | 1998 |
| Josefin Johansson AS | Professional & scientific | 2014 |
| Josefine 23 AS | Hospitality | 2017 |
| Josefine Vertshus AS | Hospitality | 1989 |
| Josefinegaten 12 AS | Real estate | 1955 |
| Josefinegaten 29 Ans | Real estate | 1990 |
| Josefinegt 18 AS | Real estate | 2017 |
| Josefines Gate 1 AS | Real estate | 2015 |
| Josefines Gate 30 AS | Real estate | 2015 |
| Josefinesgate 35 AS | Real estate | 2014 |
| Josephine Atelier AS | Other services | 2015 |
| Josevo AS | Professional & scientific | 2018 |
| Josfri AS | Transport & logistics | 2022 |
| Josie Consulting AS | Professional & scientific | 2023 |
| Josko Holding AS | | 2025 |
| Joso-R AS | Professional & scientific | 2017 |
| Jossen AS | Wholesale & retail | 2024 |
| Jossi AS | Financial services | 2014 |
| Jost AS | Real estate | 2019 |
| Jostein Bjørndal AS | Professional & scientific | 2014 |
| Jostein Christensen Holding AS | | 2021 |
| Jostein Pedersen Holding AS | | 2021 |
| Jostein Rønsen Arkitekter AS | Professional & scientific | 1995 |
| Jot Eiendom AS | Real estate | 2022 |
| Jotelino AS | | 2021 |
| Joti Holding AS | | 2020 |
| Jotinor AS | Real estate | 2008 |
| Joto Grønt Og Hvitt AS | Administrative & support | 2025 |
| Joto Holding AS | | 2017 |
| Jotobico AS | Real estate | 1994 |
| Jotobico Holding AS | Real estate | 2005 |
| Jotre International AS | Wholesale & retail | 2020 |
| Jotron Skipper AS | Manufacturing | 1992 |
| Jotrum AS | | 2018 |
| Jotta Group AS | Information & communication | 2008 |
| Jottmann AS | Financial services | 2017 |
| Jotunfjell AS | Professional & scientific | 2000 |
| Jotunfjell Partners AS | Professional & scientific | 2014 |
| Joty AS | Information & communication | 2026 |
| Joudi Invest AS | | 2023 |
| Joule AS | Administrative & support | 2022 |
| Joulia AS | Energy | 2019 |
| Joulia Holding AS | | 2025 |
| Jourdan AS | Professional & scientific | 2023 |
| Jourdan-Andersen Management AS | Professional & scientific | 2025 |
| Journalia AS | Information & communication | 2024 |
| Journey Agency Norway AS | Information & communication | 1952 |
| Journey AS | Real estate | 2024 |
| Journey Technologies AS | Information & communication | 2021 |
| Journeys Travel Group AS | Administrative & support | 2019 |
| Joviale Eiendom AS | Construction | 2006 |
| Jovim AS | | 2020 |
| Jovito AS | Financial services | 2005 |
| Jovoko AS | Financial services | 1999 |
| Jovosoft AS | Information & communication | 2022 |
| Jowimi AS | Financial services | 2005 |
| Jowit AS | | 2021 |
| Jowor AS | Real estate | 2022 |
| Jowst AS | Arts & recreation | 2016 |
| Joy & Co AS | Arts & recreation | 2020 |
| Joy Holding AS | Professional & scientific | 2013 |
| Joy Music AS | Arts & recreation | 2013 |
| Joy Zone AS | Information & communication | 2005 |
| Joycar AS | Wholesale & retail | 2024 |
| Joymo AS | Information & communication | 2016 |
| Joyn Holding AS | | 2012 |
| Joyride AS | Information & communication | 2026 |