| Jomaho AS | Financial services | 2016 |
| Jomakc Holding AS | | 2025 |
| Jomani AS | Financial services | 2005 |
| Jomani Invest AS | | 2019 |
| Jomark AS | Real estate | 2014 |
| Jomba AS | Wholesale & retail | 2024 |
| Jome AS | | 2026 |
| Jomfrubråten Eiendom AS | Real estate | 2022 |
| Jomma AS | | 2005 |
| Jon Bjarne Investerer AS | | 2026 |
| Jon Bru Consulting AS | Professional & scientific | 2024 |
| Jon Cederbrand Arkitektur AS | Professional & scientific | 2017 |
| Jon Dale Invest AS | | 2023 |
| Jon Flatebø AS | Real estate | 2005 |
| Jon Flinth Vatne Holding AS | Real estate | 2016 |
| Jon Inge Bruland AS | Real estate | 2005 |
| Jon Lindstad AS | Wholesale & retail | 1999 |
| Jon Ole Og Karl Einar Ans | Arts & recreation | 2024 |
| Jon Roger Eidet AS | Health & social care | 2023 |
| Jon Sigurdsen Invest AS | | 2021 |
| Jona AS | Transport & logistics | 2010 |
| Jonas & Magnus Bygg Ans | Construction | 2001 |
| Jonas Anhede Winge | Professional & scientific | 2020 |
| Jonas Barsten AS | Information & communication | 2016 |
| Jonas Beriozovas | Administrative & support | 2009 |
| Jonas Fremstad Holding AS | | 2023 |
| Jonas Gjelstad Holding AS | | 2017 |
| Jonas Halmrast AS | | 2025 |
| Jonas Invest AS | Wholesale & retail | 2005 |
| Jonas Kinge Bergland AS | Arts & recreation | 2018 |
| Jonas Langseth Holding AS | | 2023 |
| Jonas Lies Gate 20 AS | Real estate | 2014 |
| Jonas Mat Ans | Wholesale & retail | 1992 |
| Jonas Myrer AS | | 2021 |
| Jonas Stokke AS | Professional & scientific | 2016 |
| Jonas Øglænd International AS | Wholesale & retail | 2023 |
| Jonasis & Possibilities AS | Administrative & support | 2019 |
| Jonassen Consulting Advokat AS | Professional & scientific | 2004 |
| Jonastunet 2 AS | Real estate | 2013 |
| Jonatan AS | Real estate | 1986 |
| Jonathan Murray Consulting AS | Information & communication | 2001 |
| Jonathan Tjuvholmen AS | Hospitality | 2017 |
| Jonbekk Elektro AS | Construction | 2021 |
| Jonera AS | Financial services | 2005 |
| Jones & Nguyen Da | Wholesale & retail | 2011 |
| Jones Act AS | | 2021 |
| Jones AS | | 2025 |
| Jones Engineering Group Norway AS | Professional & scientific | 2025 |
| Jones Sceneteknikk AS | Arts & recreation | 2019 |
| Jongsbru AS | Real estate | 2007 |
| Jonika AS | Wholesale & retail | 2019 |
| Joniks AS | | 2022 |
| Jonm Holding AS | Financial services | 2006 |
| Jonm Invest AS | | 2020 |
| JONN53 Consulting AS | Professional & scientific | 2020 |
| Jonna Gustafsson Holding AS | Wholesale & retail | 2017 |
| Jonny Holding AS | | 2020 |
| Jonny Hurts AS | Arts & recreation | 2020 |
| Jono Eiendom AS | Real estate | 2025 |
| Jonor AS | Professional & scientific | 2018 |
| Jonpa AS | Information & communication | 2016 |
| Jonsi Venture AS | | 2026 |
| Jonsokveien Invest AS | Real estate | 2014 |
| Jonsson Holding AS | | 2025 |
| Jonsten Råde AS | Real estate | 2005 |
| Jonsvannsveien 73 AS | Real estate | 2023 |
| Joo Investments AS | | 2006 |
| Joor Ventures AS | Information & communication | 2023 |
| Jopa Invest AS | | 2020 |
| Jope AS | Households | 1932 |
| Joppe Holding AS | Professional & scientific | 2019 |
| Joppe Invest AS | | 2021 |
| Jor Farms AS | Manufacturing | 2018 |
| Jor Greentech AS | Professional & scientific | 2018 |
| Jora AS | | 2026 |
| Jora Holdning AS | Health & social care | 2023 |
| Joram Holding AS | Financial services | 2017 |
| Joranor AS | Financial services | 2008 |
| Jorbjo Invest AS | | 2021 |
| Jord AS | Wholesale & retail | 2018 |
| Jord Invest AS | Financial services | 2018 |
| Jord Mikrohagesenter AS | Wholesale & retail | 2025 |
| Jorda Rundt AS | Hospitality | 2023 |
| Jordal 2 AS | Real estate | 2017 |
| Jordal 3 AS | Real estate | 2017 |
| Jordal Bil AS | Wholesale & retail | 1978 |
| Jordal Haveli AS | Hospitality | 2018 |
| Jordal Paramount AS | Professional & scientific | 2026 |
| Jordalen Kraftlag AS | Energy | 2003 |
| Jordalsgaten Eiendom AS | Real estate | 2007 |
| JORDAN23 AS | | 2026 |
| Jordanes AS | | 2024 |
| Jordanes Asset Management AS | Real estate | 2021 |
| Jordanes Equity AS | | 2024 |
| Jordanes Holding AS | Manufacturing | 2018 |
| Jordanes Invest AS | Manufacturing | 2018 |
| Jordanes Investments AS | Manufacturing | 2013 |
| Jordanes Investments Holding AS | Manufacturing | 2013 |
| Jordanes Newco AS | Administrative & support | 2026 |
| Jordanes Properties AS | Real estate | 2026 |