| Joyrider AS | Real estate | 2012 |
| Joyweek AS | Wholesale & retail | 2011 |
| Joyyoga AS | Education | 2022 |
| JP Capital Holding AS | | 2026 |
| JP Consult AS | Professional & scientific | 2023 |
| JP Investment AS | | 2020 |
| JP Kabia AS | Real estate | 2021 |
| JP Maler AS | Construction | 2026 |
| JP Prosjekt AS | Information & communication | 2015 |
| Jp.Economy and Trading AS | Professional & scientific | 2013 |
| Jpa AS | Financial services | 2015 |
| Jpa Rådgivning AS | Professional & scientific | 2021 |
| JPB Prosjekt AS | Administrative & support | 2021 |
| JPC AS | Information & communication | 1996 |
| Jpe AS | Financial services | 2010 |
| JPF Invest AS | | 2023 |
| JPG Apps AS | Information & communication | 1998 |
| JPG Holding AS | | 2021 |
| JPG Reklamebyrå AS | Professional & scientific | 2005 |
| JPH AS | | 2015 |
| Jpholding AS | Financial services | 2015 |
| Jphs Invest AS | | 2023 |
| JPJ Capital AS | Financial services | 2012 |
| Jpkh Invest AS | | 2021 |
| Jploe Invest AS | | 2024 |
| JPM Støpeasfalt AS | | 2005 |
| JPN Investco AS | | 2024 |
| Jpo AS | Information & communication | 2014 |
| JPR AS | Professional & scientific | 2005 |
| Jprofessionals AS | Information & communication | 2021 |
| JPS Consulting AS | Information & communication | 2006 |
| JPS Enterprise AS | | 2024 |
| JPS Records Da | Information & communication | 2005 |
| Jptn Holding AS | | 2026 |
| JPV Consulting Nuf | Professional & scientific | 2013 |
| JR Anlegg AS | Construction | 1983 |
| JR Bolig AS | Real estate | 2020 |
| JR Consult & Invest AS | Information & communication | 2007 |
| JR Diner AS | Hospitality | 2022 |
| JR Drift & Vedlikehold AS | Professional & scientific | 2022 |
| JR Ewing Music Da | Arts & recreation | 2002 |
| JR Holdings AS | Financial services | 2014 |
| JR Investments AS | | 2024 |
| JR Olsen Consult AS | Information & communication | 2020 |
| JR Oslo Transport AS | Transport & logistics | 2026 |
| JR Sandvika AS | Hospitality | 2023 |
| JR Storo AS | Hospitality | 2023 |
| JRD Invest AS | Transport & logistics | 2022 |
| JRJ Advisory AS | Professional & scientific | 2021 |
| JRM Utvikling AS | Real estate | 2018 |
| JRP AS | Hospitality | 2024 |
| JRP International AS | Professional & scientific | 1966 |
| JRP International Holdco AS | Real estate | 2021 |
| JRP International Holdco Eiendom AS | Real estate | 2021 |
| JRS Invest AS | | 2024 |
| Jrtm Holding AS | | 2022 |
| JS Bidco 2 AS | | 2025 |
| JS Dagligvare AS | Wholesale & retail | 2023 |
| JS Kapital AS | Real estate | 2007 |
| JS Piano Scandinavia AS | Wholesale & retail | 2012 |
| JS Prosjekt AS | Professional & scientific | 2023 |
| JS Recordings AS | Information & communication | 2021 |
| JS Trading M J Butt & S Cham Da | Wholesale & retail | 1996 |
| Jsa AS | Professional & scientific | 2015 |
| Jsa Invest AS | Professional & scientific | 2017 |
| Jsaa Holding AS | Real estate | 2020 |
| Jsan Consulting AS | Professional & scientific | 2022 |
| JSB Investments AS | | 2024 |
| JSC AS | | 2025 |
| JSC Invest Ltd Nuf | Professional & scientific | 2024 |
| JSD IT Consultancy AS | Information & communication | 2017 |
| Jse AS | Real estate | 2021 |
| Jse Holding AS | | 2020 |
| JSF Holding AS | Professional & scientific | 2019 |
| JSF Invest AS | | 2025 |
| JSF Utvikling AS | Professional & scientific | 2017 |
| JSG Eiendom AS | Real estate | 2023 |
| JSG Event AS | Arts & recreation | 2023 |
| JSG Holding AS | Other services | 2016 |
| JSG Kultur & Event AS | | 2025 |
| Jsgk AS | | 2024 |
| JSH Aporegnskap AS | Professional & scientific | 2001 |
| Jsi Holding AS | Wholesale & retail | 2005 |
| Jsi Invest AS | | 2024 |
| JSJ AS | Hospitality | 2008 |
| JSK Bygg Ans | Construction | 2006 |
| JSK Entreprenør AS | Construction | 2017 |
| JSK Invest AS | | 2025 |
| JSK Kapital AS | | 2015 |
| JSL AS | Transport & logistics | 2014 |
| JSL Eiendom AS | Real estate | 2017 |
| JSL Invest AS | Financial services | 2005 |
| JSL Topco AS | | 2022 |
| Jso Capital AS | | 2024 |
| Json AS | Administrative & support | 2013 |
| JSP Invest AS | Financial services | 2005 |
| JSQ AS | Real estate | 2006 |
| JSR Invest AS | Real estate | 2018 |
| JSS AS | | 2020 |
| JSS Capital Management AS | | 2024 |