| Inni Hus & Hytter AS | Real estate | 1998 |
| Input AS | Information & communication | 1986 |
| Insegment AS | Information & communication | 2012 |
| Intellectual Capital Serv Norw AS | Professional & scientific | 1998 |
| Inter Konsult AS | Professional & scientific | 1997 |
| Interactor AS | Professional & scientific | 2019 |
| Interesentskapet a Falkenberg Eftf Ans | Real estate | 1987 |
| Interflora Norge SA | Administrative & support | 1975 |
| Interholding AS | Wholesale & retail | 2016 |
| International Lighting Systems AS | Wholesale & retail | 2020 |
| Iot Holding AS | Information & communication | 2006 |
| Iot Value AS | Information & communication | 2017 |
| Isat AS | Information & communication | 2012 |
| Isms Coaching AS | Information & communication | 2020 |
| IT Nett Da | Information & communication | 1999 |
| Ivanov Holding AS | | 2019 |
| J&H Holdco AS | | 2021 |
| JC Moss AS | Real estate | 2022 |
| JCR Management AS | Professional & scientific | 2019 |
| Jens Andreas Pettersen Holding AS | Information & communication | 2022 |
| Jessheim Smart Repair AS | Other services | 2013 |
| Jessheim Sør Bolig AS | Real estate | 2017 |
| Jeto AS | Real estate | 2019 |
| Jetpro Da | Information & communication | 1991 |
| Jfknudtzen AS | Wholesale & retail | 1987 |
| Jim AS | Health & social care | 2007 |
| Jke Design Asker Og Bærum AS | Wholesale & retail | 2014 |
| Jlien Holding AS | | 2022 |
| Joakim Burud Holding AS | Real estate | 2016 |
| Johan Follestadsvei 14 AS | Real estate | 2008 |
| Jones Arkitekter AS | Professional & scientific | 1987 |
| Jovar Holding AS | | 2013 |
| Jubel Invest AS | Real estate | 2016 |
| Jungle Holding AS | | 2022 |
| Junkyard AS | Wholesale & retail | 1994 |
| Juul Gagnum AS | Real estate | 1966 |
| JV Consulting AS | Professional & scientific | 1990 |
| Jølstad Eiendom AS | Real estate | 2017 |
| Jølstad Holding AS | | 2025 |
| K Sandell Bygg AB | Construction | 1998 |
| Kachar Holding AS | | 2026 |
| Kaggen Gård AS | Real estate | 2003 |
| Kalklindeskogen AS | Real estate | 2019 |
| Kamano Invest AS | Financial services | 2017 |
| Kanto AS | Information & communication | 2022 |
| Kanto Invest AS | Professional & scientific | 2010 |
| Kapi AS | Construction | 2015 |
| Karihaugveien 22 AS | Real estate | 2004 |
| Karihaugveien 22 Holding AS | Real estate | 2010 |
| Karolan AS | Real estate | 2010 |
| Kart AS | Transport & logistics | 2020 |
| Kdo-Import AS | Wholesale & retail | 2019 |
| Kei Holding AS | | 2026 |
| Kirkegata 29 Sarpsborg AS | Real estate | 2020 |
| Kitron ASA | Manufacturing | 1996 |
| Kjeksfabrikken AS | Real estate | 1998 |
| Klavins AS | | 2021 |
| Klosterøya Bolig AS | Real estate | 2016 |
| Knarresmed AS | Professional & scientific | 2024 |
| Knudsen Revisjonsbyrå AS | Professional & scientific | 1995 |
| Komet Trafikkskole Billingstad AS | Education | 2025 |
| Kono Invest AS | Professional & scientific | 2005 |
| Konseptet AS | Professional & scientific | 2001 |
| Korn Og Søt AS | Wholesale & retail | 2026 |
| Krishna Bar AS | | 2025 |
| Kvelsrud Gård AS | Real estate | 2007 |
| L'Occitane Norge AS | Wholesale & retail | 2013 |
| Lager for Alle AS | Real estate | 2020 |
| Lager for Alle Gulliveien 4 AS | Real estate | 2018 |
| Lagerbod for Alle AS | Real estate | 2025 |
| Landbruksveien 2 AS | Wholesale & retail | 2006 |
| Langenga Bolig AS | Real estate | 2016 |
| Lannor AS | Professional & scientific | 2013 |
| Larmark Invest AS | | 2025 |
| Lavenergisystemer AS | Wholesale & retail | 2012 |
| Lavrans Grid AS | Administrative & support | 2018 |
| Lavrans Tech AS | Information & communication | 2022 |
| Leaseconsult AS | Professional & scientific | 2022 |
| Leva Bergerløkka AS | Real estate | 2022 |
| Leva Jessheim Park AS | Real estate | 2021 |
| Leve Livet AS | Hospitality | 1999 |
| Lfa Mjøndalen AS | Real estate | 2023 |
| Lfa Nord AS | Real estate | 2025 |
| Lfa Prosjekt AS | Real estate | 2021 |
| Lfa Vest AS | Real estate | 2022 |
| LHM Holding AS | | 2019 |
| Lia Capital AS | Financial services | 2018 |
| Ligi AS | Real estate | 2013 |
| Lilleberg Bolig AS | Real estate | 2018 |
| Lilleberg Bolig Hjelp AS | | 2026 |
| Lilleberg Eiendom AS | Real estate | 2018 |
| Lilleberg Eiendom Holding AS | Real estate | 2018 |
| Lilleberg Energi AS | Energy | 2018 |
| Lillevik Invest AS | Professional & scientific | 2018 |
| Lillevika AS | Real estate | 2010 |
| Lilleåsen 2 AS | Real estate | 2007 |
| Lillit AS | Professional & scientific | 2005 |
| Limatho Invest AS | Professional & scientific | 2005 |
| Lindebergvegen 12 AS | Real estate | 2005 |
| Linhøi AS | Real estate | 2019 |