| Jekbo AS | Financial services | 2017 |
| Jeki AS | Real estate | 2008 |
| Jekkestø Open AS | | 2026 |
| Jekslaveien 2 AS | Real estate | 2018 |
| Jel Sverre AS | Real estate | 2023 |
| Jelco AS | Construction | 1995 |
| Jeld-Wen Norge AS | Wholesale & retail | 1999 |
| Jeloro AS | Information & communication | 2026 |
| Jelpr AS | Information & communication | 2020 |
| Jeløy Ingeniørforretning AS | Professional & scientific | 2019 |
| Jeløyafestivalen AS | Arts & recreation | 2024 |
| Jem AS | | 2025 |
| Jem Forvaltning AS | Real estate | 2016 |
| Jem Hall Coaching AS | Education | 2020 |
| Jem Holding AS | Real estate | 2016 |
| Jemar Holding AS | Real estate | 2014 |
| Jemco Executive AS | Administrative & support | 2013 |
| Jemco Holding AS | Professional & scientific | 2005 |
| Jemi Holding AS | Real estate | 2007 |
| Jemo Holding AS | | 2026 |
| Jems Holding AS | Financial services | 2005 |
| Jemtlandsvegen 5 AS | Real estate | 2011 |
| Jena Fsa GmbH | Administrative & support | 2011 |
| Jenan Klinikk AS | Other services | 2024 |
| Jenfil Holding AS | Real estate | 2021 |
| Jeng Holding AS | | 2016 |
| Jengo Invest AS | Real estate | 2015 |
| Jenju Invest AS | Real estate | 2022 |
| Jenkins&Uhnger AS | Professional & scientific | 2022 |
| Jennbert Holding AS | Professional & scientific | 2021 |
| Jenner Invest AS | | 2022 |
| Jenni Market Limited Nuf | Wholesale & retail | 2025 |
| Jennmar Norway AS | Professional & scientific | 2025 |
| Jenny Becker AS | Wholesale & retail | 2022 |
| Jenny Fjelberg Lunde AS | Professional & scientific | 2021 |
| Jenny Gjerløw AS | Education | 2023 |
| Jenny Hutchens AS | Professional & scientific | 2021 |
| Jenny Marie Holding AS | Hospitality | 2022 |
| Jenny Skavlan AS | Arts & recreation | 2015 |
| Jenny Skavlan Holding AS | Arts & recreation | 2015 |
| Jenoma AS | Real estate | 2005 |
| Jenpe AS | | 2021 |
| Jens & Friends AS | Professional & scientific | 2010 |
| Jens & Jens AS | Wholesale & retail | 2017 |
| Jens Bjelkes Gate 78A AS | Real estate | 2020 |
| Jens Dellit | Construction | 2009 |
| Jens Eriksen AS | Manufacturing | 2005 |
| Jens Evensen AS | Real estate | 2020 |
| Jens Evensen Brygger AS | Real estate | 2007 |
| Jens Evensen Eiendom AS | Real estate | 2020 |
| Jens Evensen Eiendomsselskap AS | Real estate | 1971 |
| Jens Evensen Eiendomsutvikling Ans | Real estate | 2001 |
| Jens Evensen Holding AS | Real estate | 2005 |
| Jens Nesse AS | Real estate | 2007 |
| Jens S Transmisjoner AS | Wholesale & retail | 2000 |
| Jens Zetlitz Gate 20 AS | Real estate | 2025 |
| Jensas AS | Professional & scientific | 2025 |
| Jenseg Holding AS | Financial services | 2018 |
| Jensen & Co Ans | Professional & scientific | 1997 |
| Jensen & Skodvin Arkitekter AS | Professional & scientific | 2021 |
| Jensen & Skodvin Arkitektkontor AS | Professional & scientific | 2010 |
| Jensen Auto Service AS | Other services | 2020 |
| Jensen Autoglass AS | Construction | 2006 |
| Jensen Capital AS | | 2025 |
| Jensen Holding AS | Real estate | 1971 |
| Jensen It-Consulting AS | Information & communication | 1997 |
| Jensen Norge AS | Manufacturing | 2016 |
| Jensen-Holding AS | | 2025 |
| Jensenbors AS | Real estate | 2022 |
| Jensens Bilservice AS | Other services | 2012 |
| Jensens Bøfhus AS | Hospitality | 2011 |
| Jensensoftware AS | Information & communication | 2004 |
| Jenseplassen AS | Financial services | 2015 |
| Jensheim AS | Wholesale & retail | 2008 |
| Jensito AS | Manufacturing | 2005 |
| Jenska Capital AS | | 2026 |
| Jenssen Invest Ans | | 1991 |
| Jensvoll Næringseiendom AS | Real estate | 2018 |
| Jentesport AS | Wholesale & retail | 2011 |
| Jenteviga Invest AS | | 2025 |
| Jentol Import Da | | 1989 |
| Jenvin-Steinsvåg Ans | Professional & scientific | 2023 |
| Jenz AS | Information & communication | 2026 |
| Jeps AS | Manufacturing | 1991 |
| Jer AS | | 2024 |
| Jera AS | Professional & scientific | 2007 |
| Jeri AS | Transport & logistics | 2000 |
| Jeriko Interessenter I AS | Real estate | 2014 |
| Jeriko Private Friluftsbarnehage Ans | Education | 1998 |
| Jeriko Private Friluftsbarnehage AS | Education | 2012 |
| Jerikoveien 14 AS | Real estate | 2007 |
| Jerikoveien 18 AS | Real estate | 2019 |
| Jerikoveien 22 AS | Real estate | 2011 |
| Jerikoveien 28 AS | Real estate | 2016 |
| Jerikoveien Xxvi AS | Real estate | 2017 |
| Jern Og Bygg Oslo AS | Real estate | 1983 |
| Jernbaneallèen 22 AS | Real estate | 2012 |
| Jernbanegata 1 Eiendom AS | Real estate | 2014 |
| Jernbanegata 10 AS | Real estate | 2026 |
| Jernbanegata 3 Porsgrunn AS | Real estate | 2008 |