| Jensaas Invest AS | | 2020 |
| Jervell Gjestehus AS | Hospitality | 2020 |
| Jeur Horizon AS | | 2024 |
| Jevi Invest AS | | 2024 |
| JGV Invest AS | | 2026 |
| Jibe AS | Information & communication | 2020 |
| Jir AS | Real estate | 2005 |
| JJ Ventures AS | Real estate | 2026 |
| JL Visuals AS | Information & communication | 2018 |
| JLL 1 AS | | 2022 |
| Jmcj Consulting Nuf | Information & communication | 2023 |
| Jmcj Invest | | 2023 |
| Jno AS | Wholesale & retail | 2019 |
| Joa Holding AS | Financial services | 2005 |
| Jode AS | Administrative & support | 2022 |
| Johan F Aasen AS | Professional & scientific | 1997 |
| Johansson Regnskap AS | Professional & scientific | 2018 |
| John a Larsen AS | Construction | 1991 |
| Johnny Kiosk AS | Wholesale & retail | 1995 |
| Johnny Nerland AS | Health & social care | 2013 |
| Jomarka Legesenter Da | Health & social care | 2013 |
| Jon Kristian Røsok Holding AS | | 2020 |
| Joni AS | Health & social care | 2005 |
| Jons Kontor AS | Manufacturing | 1987 |
| Joot Invest AS | | 2022 |
| Jordbærpikene Moa AS | Hospitality | 2018 |
| Jordisk Gods AS | Professional & scientific | 2005 |
| Jorkjend AS | Arts & recreation | 2022 |
| Josefine Hagen Interiørarkitekt AS | Professional & scientific | 2023 |
| Jothosi Holding AS | Wholesale & retail | 1986 |
| Jovel AS | | 2022 |
| Jovi Eiendom AS | Real estate | 1997 |
| JP Bilpleie AS | Other services | 2022 |
| JRL1 AS | Real estate | 2022 |
| JRL2 AS | Real estate | 2022 |
| Jse-Invest AS | Real estate | 2021 |
| JSH Eiendom AS | | 2025 |
| JSR AS | Real estate | 2018 |
| Jugend Holding AS | | 2015 |
| Jugendby Barnehage AS | Education | 2008 |
| Jukebox AS | Wholesale & retail | 1995 |
| Jules Holding AS | | 2019 |
| Julok AS | Professional & scientific | 2024 |
| Jusu Invest AS | | 2023 |
| Juvatind AS | Professional & scientific | 2021 |
| Jøfo AS | | 2024 |
| Jølster Hotell AS | Hospitality | 2011 |
| K F Breivik Eiendom AS | Real estate | 1999 |
| K Hagen AS | Wholesale & retail | 1934 |
| K J Gjelsten Holding AS | Financial services | 2005 |
| K-C Bygg AS | Construction | 2025 |
| K-J Holding AS | Financial services | 2005 |
| K. Breivik Holding AS | Manufacturing | 2005 |
| K. G. Karlsson Eiendom AS | Real estate | 2015 |
| K. G. Karlsson Holding AS | Real estate | 2015 |
| K.V. Røst Investment AS | Financial services | 2005 |
| K11 Kontor AS | Real estate | 2021 |
| K19 Food AS | Hospitality | 2000 |
| Kaaresen Holding AS | Real estate | 2017 |
| Kabo Invest AS | Real estate | 2005 |
| Kabri Invest AS | Real estate | 1998 |
| Kabsel AS | Professional & scientific | 2022 |
| Kaffi & Kake AS | Information & communication | 2025 |
| Kaldaljós Kunst AS | Professional & scientific | 2019 |
| Kaldbakur AS | Agriculture & fishing | 2022 |
| Kaliber AS | Information & communication | 2004 |
| Kalla AS | Real estate | 2012 |
| Kalvøyvegen 20 AS | Real estate | 2007 |
| Kama Holding AS | | 2001 |
| Kamelåså AS | Construction | 2015 |
| Kamo Eiendom AS | Construction | 2009 |
| Kamo Ent. AS | Construction | 2017 |
| Kamo Invest AS | Construction | 2008 |
| Kanalveien 18 AS | Real estate | 2024 |
| Kaos Teori SA | Health & social care | 2024 |
| Kar Aalesund AS | Wholesale & retail | 2023 |
| Karabag Eiendom AS | | 2023 |
| Karitind AS | Financial services | 2012 |
| Karlsberg AS | Wholesale & retail | 1983 |
| Karoline Tynes Design AS | Professional & scientific | 2024 |
| Karolus Eiendom AS | Real estate | 2007 |
| Karsten Gefle AS | Arts & recreation | 2012 |
| Kartmannen AS | Wholesale & retail | 2018 |
| Karuseren AS | Wholesale & retail | 2020 |
| Karval Bygg AS | Construction | 2020 |
| Kasil AS | Real estate | 2024 |
| Kaspars Bygg AS | Construction | 2017 |
| Kastanjeknuten AS | Wholesale & retail | 2006 |
| Kasti Ans | Administrative & support | 2001 |
| Kati Sport AS | Professional & scientific | 2018 |
| Katrine Florvaag AS | | 2021 |
| Kaupangen AS | Real estate | 2026 |
| KB Technologies AS | Professional & scientific | 2026 |
| Kb.Aakre AS | Professional & scientific | 2022 |
| KCS Holding AS | Construction | 2013 |
| KD Invest AS | | 2020 |
| Kda Rørsystemer AS | Professional & scientific | 2023 |
| KDR Holding AS | Health & social care | 2021 |
| Ke Regnskap AS | Professional & scientific | 2016 |
| Kebab 1 AS | Hospitality | 2014 |