| Jakob Askelandsvei 1 AS | Real estate | 2011 |
| Jakob Idland AS | Real estate | 1992 |
| Jam Coffee AS | Wholesale & retail | 2020 |
| Jameto AS | Professional & scientific | 2016 |
| Jan Lægaard Broni AS | Financial services | 2017 |
| Janegilrefsnes Holding AS | | 2023 |
| Jansen Og Willumsen Services AS | Mining & quarrying | 1997 |
| Jansson & Larsen Regnskap Sandnes AS | Professional & scientific | 2019 |
| Jarle Egeland AS | | 2021 |
| Jarstein AS | Arts & recreation | 2012 |
| Javiel AS | Professional & scientific | 2006 |
| Jbgb AS | | 2023 |
| JBK Offshore Service AS | Professional & scientific | 2021 |
| JC Uteanlegg AS | Construction | 2023 |
| JD Design AS | Professional & scientific | 2014 |
| Je Hafnor AS | Professional & scientific | 2005 |
| Je Ludvigsen Holding AS | | 2026 |
| Jeger Invest AS | Real estate | 2006 |
| Jek Stavanger Holding AS | Financial services | 2016 |
| Jelsa Eiendom AS | Real estate | 2005 |
| Jelsaco AS | Professional & scientific | 1988 |
| Jens B Lunde Elektro AS | Construction | 1989 |
| Jernbanegata 5 AS | Real estate | 2025 |
| Jersk Invest AS | Real estate | 2005 |
| Jes Invest AS | Transport & logistics | 2006 |
| Jet AS | Information & communication | 2014 |
| Jeto Bilsalg AS | Wholesale & retail | 2016 |
| Jeto Invest AS | Wholesale & retail | 2015 |
| JH Andersen Bygg AS | | 2014 |
| JHN Subsea AS | Professional & scientific | 2016 |
| Ji & Ji AS | Hospitality | 2022 |
| JJH Marine Consulting AS | Professional & scientific | 2016 |
| JJM AS | Real estate | 2021 |
| JK Løland AS | | 2023 |
| JK Mæland AS | Financial services | 2013 |
| JK Svendsbø Invest AS | | 2015 |
| Jk-Holding AS | Financial services | 2005 |
| Jke Holding AS | Financial services | 2005 |
| Jkhd Invest AS | Professional & scientific | 2017 |
| JLS Invest AS | Arts & recreation | 2006 |
| JM Mæland AS | | 2025 |
| JM Nebula AS | Other services | 2017 |
| JM Økonomipartner AS | Professional & scientific | 2008 |
| JML Utbygging AS | Real estate | 2007 |
| Jmlb Holding AS | | 2023 |
| JMR Holding AS | Real estate | 2018 |
| Jmtaarnes Holding AS | | 2026 |
| Jo S. Mæhle Invest AS | | 2015 |
| Joakim Bjerk AS | Professional & scientific | 2017 |
| Joakimsen Holding AS | | 2019 |
| Joal Eiendom AS | Real estate | 2017 |
| Jobbkontroll AS | Information & communication | 2026 |
| Joc Transport & Flyttebyrå AS | Transport & logistics | 2026 |
| Johan C. Fochsen Holding AS | Real estate | 2005 |
| Johan Olsen Holding AS | Real estate | 1923 |
| Johann Langliz | Construction | 2008 |
| Johansen-Vvs AS | Construction | 2010 |
| Johanssen AS | Professional & scientific | 2014 |
| John E Bjørvik AS | Real estate | 1994 |
| Johnny Norland AS | Wholesale & retail | 2005 |
| Johns Invest AS | Financial services | 2012 |
| Johnsen & Jensen AS | Construction | 1996 |
| Johnsen & Jensen Eiendom AS | Construction | 2005 |
| Johs. Ørland Holding AS | Transport & logistics | 2011 |
| Johtor Eiendom AS | Real estate | 2004 |
| Jolaug Holding AS | | 2018 |
| Jolaug Konsulenttjenester Ans | Professional & scientific | 2024 |
| Joma AS | Health & social care | 2019 |
| Jonas B Gundersen Norge AS | Administrative & support | 2005 |
| Jonas Hegre AS | Wholesale & retail | 2016 |
| Jonas Hegre Eiendom AS | Real estate | 2014 |
| Jonas Vinduer AS | Wholesale & retail | 2014 |
| Jonas Vinduer Byggetjenester AS | Construction | 2018 |
| Jonassen Byggtjenester AS | Construction | 2016 |
| Jonathan Consulting AS | Hospitality | 2017 |
| Jone Tungland AS | Wholesale & retail | 2001 |
| Jone Tungland Holding AS | Wholesale & retail | 2005 |
| Jope Holding AS | | 2023 |
| Jordbærpikene Kvadrat AS | Hospitality | 2023 |
| Jornes Invest AS | | 2022 |
| Josdal AS | Real estate | 1989 |
| Josti AS | | 2018 |
| Josti Holding I AS | | 2018 |
| Josu Holding AS | | 2019 |
| Jotoro Holding AS | | 2020 |
| JPT AS | Manufacturing | 2009 |
| JR Austad Eiendom AS | Real estate | 2005 |
| JR Austad Holding AS | Real estate | 2005 |
| JS Boligstyling Da | Professional & scientific | 2024 |
| JS Investering AS | | 2026 |
| JS Parts AS | Administrative & support | 2024 |
| Jsi AS | Real estate | 2005 |
| JSM Holding AS | Real estate | 2007 |
| JTH Tjenester AS | Transport & logistics | 2017 |
| JTJ Eiendom AS | Real estate | 2012 |
| JTJ Rådgivning AS | Professional & scientific | 2022 |
| JTL Consulting AS | Professional & scientific | 2011 |
| Juhlin AS | Professional & scientific | 2024 |
| Juke Holding AS | Wholesale & retail | 2016 |
| Julebygda Eiendom AS | Real estate | 1988 |