| JSS Dykkertjeneste AS | Professional & scientific | 2025 |
| JSS Eiendom AS | Real estate | 2015 |
| JST AS | Real estate | 2019 |
| Jstra AS | Information & communication | 2015 |
| JSW Drift AS | Hospitality | 2018 |
| JSW Invest AS | | 2021 |
| Jsø Utvikling AS | Real estate | 2020 |
| JT Bidco AS | | 2025 |
| JT Bygg & Eiendom AS | Construction | 2022 |
| JT Consulting Holding Limited | | 2024 |
| JT Consulting Nuf | Professional & scientific | 2004 |
| JT Distribusjon | Wholesale & retail | 2004 |
| JT Holdco AS | | 2025 |
| JT Langset AS | Real estate | 2005 |
| JT Media AS | Arts & recreation | 2015 |
| JT Renhold AS | Administrative & support | 2023 |
| JT Seland Holding AS | | 2025 |
| JT Transport AS | Transport & logistics | 2020 |
| JT- Bygg AS | Construction | 2012 |
| Jtas AS | Energy | 2020 |
| JTC AS | Arts & recreation | 2009 |
| JTD Holding AS | | 2025 |
| Jtech AS | Information & communication | 2006 |
| JTF Holding AS | Arts & recreation | 2007 |
| JTG Arkitekter AS | Professional & scientific | 2009 |
| JTJ Ventures AS | | 2024 |
| JTQ Capital AS | | 2026 |
| Jtvenge Holding AS | Wholesale & retail | 2016 |
| Ju Holding AS | Health & social care | 2021 |
| Ju-St AS | Professional & scientific | 2015 |
| Juba Invest AS | | 2021 |
| Jubafilm AS | Information & communication | 2011 |
| Jubalong Invest AS | Real estate | 2007 |
| Jubel Boost AS | | 2024 |
| Jubel Design AS | Professional & scientific | 2021 |
| Jubel Eventyr AS | Arts & recreation | 2019 |
| Jubel Eventyr Coco AS | Professional & scientific | 2020 |
| Jubel Eventyr Holding AS | Other services | 2019 |
| Jubel Games AS | Manufacturing | 2023 |
| Jubel Kapital AS | Hospitality | 2023 |
| Jubelbud AS | Information & communication | 2025 |
| Jubelhuset AS | Professional & scientific | 2021 |
| Juber AS | Information & communication | 2024 |
| Jubi Thaisilke Sysenter Ans | Manufacturing | 2007 |
| Jubida AS | Manufacturing | 1998 |
| Jubilo Musikkskole AS | Education | 2014 |
| Jubilum AS | Wholesale & retail | 2015 |
| Jubok AS | Information & communication | 2015 |
| Juc AS | Wholesale & retail | 2024 |
| Juc Norge AS | Education | 2021 |
| Juce AS | | 2005 |
| Juchal Invest AS | Real estate | 2008 |
| Judge Ans | Real estate | 2010 |
| Judge AS | | 2010 |
| Juel Kolonial AS | Wholesale & retail | 2022 |
| Juell Gruppen AS | Real estate | 2017 |
| Juellestemning AS | | 2021 |
| Juels 33 Aker Brygge AS | Wholesale & retail | 2026 |
| Juels 33 Kolonial Bjørvika AS | Wholesale & retail | 2026 |
| Juels Gruppen AS | | 2026 |
| Juels Kolonial AS | Wholesale & retail | 2022 |
| Juff AS | | 2026 |
| Jugaad Holding AS | | 2020 |
| Jugeanjo AS | | 2023 |
| Juha AS | | 2018 |
| Juhe Invest AS | | 2021 |
| Juhler AS | Education | 2026 |
| Juhler Group Norge AS | Administrative & support | 1984 |
| Juice Baronen Consulting AS | Professional & scientific | 2021 |
| Juicekick AS | Hospitality | 2025 |
| Juicelife Holding AS | Professional & scientific | 2006 |
| Juicy Producy AS | Information & communication | 2023 |
| Juicy Producy Holding AS | Professional & scientific | 2020 |
| Juicy Talent AS | Professional & scientific | 2023 |
| Juju Holding AS | | 2026 |
| Jukes AS | Real estate | 1997 |
| Juks & Fanteri AS | Professional & scientific | 2018 |
| Jul Kapital AS | Real estate | 2017 |
| Jul Pettersens Gate 2 AS | Real estate | 2014 |
| JUL7TH AS | | 2023 |
| Julasol Holding AS | | 2023 |
| Julefantasi AS | Administrative & support | 2021 |
| Julegavefabrikken AS | Wholesale & retail | 2019 |
| Jules AS | Information & communication | 2016 |
| Julia Haugland Invest AS | | 2021 |
| Julia Julia Records Da | Information & communication | 2016 |
| Julia Solvik Consulting AS | Professional & scientific | 2026 |
| Julia Tingulstad AS | Health & social care | 2021 |
| Julian Reed AS | Professional & scientific | 2015 |
| Juliane AS | Financial services | 2017 |
| Julianne AS | Professional & scientific | 2021 |
| Julianne Nygård AS | Arts & recreation | 2016 |
| Julianus AS | Administrative & support | 2012 |
| Julie Andem AS | Arts & recreation | 2017 |
| Julie Balas AS | Arts & recreation | 2016 |
| Julie Bodd Jenssen AS | | 2018 |
| Julie Ec AS | | 2024 |
| Julie Elise Hauge AS | Professional & scientific | 2023 |
| Julie Haga AS | Information & communication | 2026 |
| Julie Holding AS | Financial services | 2014 |