| Izy Trafikkskole AS | Education | 2021 |
| J a N Eiendom AS | Real estate | 1986 |
| Jabi Holding AS | Professional & scientific | 2013 |
| Je Rindli Consulting AS | Information & communication | 2025 |
| Je Rindli Holding AS | | 2022 |
| Jenny Mørk AS | Arts & recreation | 2010 |
| Jfe Invest AS | | 2025 |
| Jfsh Holding AS | Professional & scientific | 2023 |
| Jh-Bilutleie AS | Administrative & support | 2024 |
| Jh-Eiendom AS | Real estate | 2024 |
| JNT Holding AS | | 2021 |
| Jonas Hagen AS | Professional & scientific | 2023 |
| Jonstøl Invest AS | Real estate | 2009 |
| JR Rørservice AS | Construction | 2016 |
| JSV Consulting AS | Professional & scientific | 2024 |
| Juel Holding AS | Wholesale & retail | 1990 |
| JV Media AS | Wholesale & retail | 2023 |
| K&P Bilsalg AS | Wholesale & retail | 2025 |
| Kabelteknikk AS | Professional & scientific | 2015 |
| Kalleberg Invest AS | | 2021 |
| Kantinemat AS | Wholesale & retail | 2017 |
| Kappløp Invest AS | | 2022 |
| Kash Kapital AS | | 2025 |
| Kawa Invest AS | Education | 2011 |
| Khehra AS | Real estate | 2024 |
| Kiesel Norge AS | Wholesale & retail | 1994 |
| Kilter AS | Professional & scientific | 2020 |
| Kjells Renhold | Administrative & support | 2010 |
| Klimapartner AS | Construction | 2025 |
| KML Transport AS | Transport & logistics | 2021 |
| Kolbotn Malerfirma AS | Construction | 2016 |
| Kompetansepartnerhelse AS | Administrative & support | 2021 |
| Komplett Solskjerming AS | Construction | 2025 |
| Konsept Service AS | Wholesale & retail | 2012 |
| Kool Renhold | Administrative & support | 2010 |
| Korero AS | Professional & scientific | 2021 |
| Kraft VVS AS | Construction | 2022 |
| Krangruppen Holding AS | Administrative & support | 2021 |
| Kredittfakta Finans AS | Administrative & support | 2017 |
| Krimesi Invest AS | Financial services | 2009 |
| Krysset AS | Education | 2023 |
| KT Capital AS | | 2026 |
| KT Hovind Invest AS | | 2019 |
| KT Vitalis AS | Health & social care | 2026 |
| Kurér Media Nuf | Professional & scientific | 2009 |
| Kvasib AS | Wholesale & retail | 1992 |
| La.Malt AS | Construction | 2025 |
| Langdalen Boliger AS | Real estate | 1992 |
| Langdalen Holding AS | Wholesale & retail | 2013 |
| Langhus Bil Og Karosseri AS | Other services | 2012 |
| Langhus Dagligvare AS | Wholesale & retail | 2026 |
| Langhus Fysioterapi AS | Health & social care | 2012 |
| Langhus Hagesenter AS | Wholesale & retail | 1993 |
| Langhus Renhold Service AS | Administrative & support | 1996 |
| Langhus Rør AS | | 2022 |
| Langhus Tannlegesenter AS | Health & social care | 2013 |
| Langhus Transport AS | Transport & logistics | 2024 |
| Langhus VVS AS | Construction | 2023 |
| Langtrade AS | Financial services | 2013 |
| Lantmännen Unibake Norway AS | Manufacturing | 2005 |
| Leif Strømme Invest AS | Real estate | 2000 |
| Leko Eiendom Invest AS | Real estate | 2024 |
| Leko Engros AS | Wholesale & retail | 2000 |
| Leko Matter AS | Other services | 1989 |
| Lenart AS | Wholesale & retail | 2024 |
| Letok AS | | 2015 |
| Lhse Invest AS | | 2021 |
| Liam Taxi AS | Transport & logistics | 2024 |
| Lincon AS | Professional & scientific | 2026 |
| Lind Invest AS | | 2022 |
| Lindvest AS | | 2021 |
| Lis Holding AS | Financial services | 2013 |
| LMC AS | Other services | 2013 |
| Longhouse Fuel AS | Wholesale & retail | 2022 |
| LS Eiendom Norge AS | Real estate | 2014 |
| LSS Creative AS | Professional & scientific | 2019 |
| Luong AS | Information & communication | 2024 |
| LVD Lastvagnsdelar AS | Wholesale & retail | 1987 |
| Lys & Meraki Ans | Administrative & support | 2025 |
| Låsteknikk AS | Wholesale & retail | 1999 |
| Löve Invest AS | Professional & scientific | 2025 |
| Løkholmen AS | Financial services | 2007 |
| M.A.S. AS | Financial services | 2014 |
| Mabelle Maison AS | Professional & scientific | 2024 |
| Macotra AS | Information & communication | 2022 |
| Mada Invest AS | | 2021 |
| Magnus Beck Eliassen AS | | 2023 |
| Magro AS | Wholesale & retail | 1996 |
| Make!Graphics AS | Manufacturing | 1970 |
| Malermester Kjell Pedersen AS | Construction | 2007 |
| Malermester Morten Vefferstad AS | Construction | 2014 |
| Mandarinen Oslo AS | Wholesale & retail | 2007 |
| Marcin Aniol AS | Wholesale & retail | 2019 |
| Marka Gruppen AS | Real estate | 2024 |
| Markaya Holding AS | | 2021 |
| Mas Motorsport AS | Arts & recreation | 2026 |
| Matgrossisten Tromsø AS | Wholesale & retail | 2015 |
| Mavi Investing AS | | 2026 |
| Medinurse AS | Health & social care | 2024 |
| Mentum Studio AS | Information & communication | 2026 |