| Impleo AS | Information & communication | 2006 |
| Ina Hardem AS | Other services | 2024 |
| Inclima AS | Wholesale & retail | 2017 |
| Industrikran Holding AS | Manufacturing | 2022 |
| Infosys Norway AS | Information & communication | 2022 |
| Ingeniør Habberstad AS | Construction | 1990 |
| Ingnor AS | | 2021 |
| Inguz AS | Real estate | 2021 |
| Inkassoregisteret Edi AS | Information & communication | 2022 |
| Inro Holding AS | Real estate | 2010 |
| Inspection Works AS | Professional & scientific | 2022 |
| Inspir-It AS | Information & communication | 2018 |
| Intact Software Systems AS | Information & communication | 2011 |
| Interlight AS | Wholesale & retail | 1997 |
| International Petroleum Exploitation AS | Professional & scientific | 1996 |
| Invaset AS | | 2019 |
| Iouli 343 Holding AS | | 2023 |
| Ip-Only Networks AS | Information & communication | 2002 |
| Isaksen Pels AS | | 1992 |
| Istari Holding AS | Health & social care | 2022 |
| Istiden Forlag AS | | 2005 |
| IT Konsulent AS | Information & communication | 2021 |
| Jabor AS | Information & communication | 2006 |
| Jara AS | Professional & scientific | 2015 |
| JBR Holding AS | Real estate | 2005 |
| Jeg Consulting AS | Professional & scientific | 2026 |
| Jenikov Industries Ltd Nuf | Real estate | 2018 |
| Jessen Management AS | Professional & scientific | 2018 |
| JFB Invest AS | Financial services | 2018 |
| Jfk-Holding AS | | 1962 |
| JFM AS | Real estate | 2006 |
| JM Eiendomsutvikling AS | Real estate | 2023 |
| Jobreg AS | Information & communication | 2013 |
| Joha Norway AS | Wholesale & retail | 2025 |
| Jotne Connect AS | Information & communication | 1988 |
| Jotne Eiendom AS | Real estate | 1997 |
| Jotne Eiendomsdrift AS | Professional & scientific | 1979 |
| Jotne Enterprise Bim Solution AS | Information & communication | 2002 |
| Jotne Holding AS | Manufacturing | 2017 |
| Jotne Industrier AS | Professional & scientific | 1990 |
| Jotne Information Technology AS | Information & communication | 1997 |
| Jotne Mobility AS | Professional & scientific | 2008 |
| Jotnehallen AS | Real estate | 2013 |
| Jqiang Holding AS | | 2026 |
| Juniper Networks Norway AS | Professional & scientific | 2004 |
| Kabooki AS | Wholesale & retail | 2006 |
| Kajul AS | Financial services | 2015 |
| Karinco AS | Financial services | 1979 |
| Kavar AS | Information & communication | 2017 |
| Ke Forsikring AS | Real estate | 2019 |
| Keak Consulting AS | Information & communication | 2017 |
| Kenaz AS | Construction | 2020 |
| Key Relocation Norway AS | Professional & scientific | 2024 |
| Keystone Academic Solutions AS | Information & communication | 2007 |
| Keystone Education Group AS | Information & communication | 2020 |
| Keystone Sports AS | Professional & scientific | 2017 |
| Kirkeristen AS | Hospitality | 2020 |
| Kiropraktor Lars Dragland AS | Health & social care | 1993 |
| Kjellman Tekstil AS | Wholesale & retail | 2012 |
| Kke Invest AS | Professional & scientific | 2009 |
| Klauva AS | | 2021 |
| Klevens Holding AS | | 2024 |
| Klinikk Resplandor AS | Other services | 2025 |
| Kloster Consulting AS | Professional & scientific | 2021 |
| KLS AS | Construction | 2018 |
| KN Food AS | Wholesale & retail | 2013 |
| Kodeverket AS | Information & communication | 2017 |
| Koffers AS | Arts & recreation | 2019 |
| Koksa 4.3 AS | Real estate | 2025 |
| Koksa 4.4 Næring AS | Real estate | 2025 |
| Koksa Holding AS | | 2022 |
| Kolbræk Holding AS | | 2018 |
| Kommunikasjonsavdelingen AS | Professional & scientific | 2021 |
| Kompagniet Norge Import AS | Wholesale & retail | 1996 |
| Komplett Salg AS | Wholesale & retail | 2021 |
| Kongelfs Pensjonat AS | Real estate | 2021 |
| Konseptgruppen AS | Hospitality | 2014 |
| Koppinvest Norge AS | Financial services | 2010 |
| Kor Holding AS | | 2020 |
| Kraftnor AS | Energy | 2025 |
| Kragstad AS | Wholesale & retail | 2005 |
| Kratos Norway AS | Information & communication | 2009 |
| Krbv 37 AS | Real estate | 2025 |
| Krismis AS | Professional & scientific | 2007 |
| Krogsveen Hjem AS | Financial services | 2024 |
| Krusen Agrochemistry Norway AS | Administrative & support | 2022 |
| Krutt AS | Real estate | 1994 |
| Kullerød Kontorbygg AS | Real estate | 2008 |
| Kvanli Invest AS | | 2024 |
| Kværner Resources AS | Administrative & support | 2011 |
| L Fashion Group AS | Wholesale & retail | 1976 |
| L&T Technology Services Limited Nuf | Information & communication | 2013 |
| Ladebekken Utvikling AS | Real estate | 2020 |
| Ladesystem AS | Manufacturing | 2021 |
| Lanars AS | Information & communication | 2019 |
| Lancelot AS | Manufacturing | 1990 |
| Langvika Utvikling AS | Real estate | 2024 |
| Lapoint Holding AS | Administrative & support | 2020 |
| Lapoint Property Holding AS | Real estate | 2021 |
| Lapoint Travels AS | Administrative & support | 2021 |