| Innovativt AS | Information & communication | 2022 |
| Intuitiv Coaching AS | Education | 2025 |
| Invest KK AS | | 2017 |
| Invest KK Holding AS | Real estate | 2020 |
| Invest TT AS | Professional & scientific | 2023 |
| Invinti AS | | 2024 |
| Inzperia AS | Education | 2021 |
| Iqbal Azhar AS | Professional & scientific | 2026 |
| Iro Capital AS | | 2026 |
| Isc Group Ltd Nuf | Professional & scientific | 2017 |
| Istanbul Catering AS | Hospitality | 2026 |
| IT Buddy AS | Information & communication | 2025 |
| IT Consulting Marcel AS | Information & communication | 2018 |
| IT Grafisk AS | Manufacturing | 2001 |
| Itiden AS | Information & communication | 2024 |
| Ivanseninvest AS | | 2026 |
| Ivar Almroth Transport & Graving AS | Construction | 1986 |
| Jahs Holding AS | Real estate | 2016 |
| Jamo-Tek AS | | 2025 |
| Janda Invest AS | | 2026 |
| Jannat Eiendom AS | Real estate | 2006 |
| Japro AS | Professional & scientific | 2017 |
| Jarsten Holding AS | Construction | 2005 |
| Jazzy Bee AS | Hospitality | 2018 |
| JB Regnskap AS | Professional & scientific | 2018 |
| JBS Textile Group Norway AS | Wholesale & retail | 1998 |
| JCC Mester Limited Nuf | Administrative & support | 2011 |
| Jeppes AS | | 2019 |
| Jesper Langlo Holding AS | | 2020 |
| Jevito Holding AS | | 2020 |
| JH Montasje & Service AS | Manufacturing | 2013 |
| JN Sport Da | Wholesale & retail | 2010 |
| Jo-Johansen Transport | Transport & logistics | 2018 |
| Jopi AS | Manufacturing | 2018 |
| Jordbærpikene Lørenskog AS | Hospitality | 2009 |
| Jordelit AS | Wholesale & retail | 2024 |
| Jotoco AS | Professional & scientific | 2007 |
| Jpa Musikktjenester AS | Arts & recreation | 2023 |
| JRK Invest AS | | 2020 |
| JT Eiendomsdrift AS | Real estate | 2025 |
| Jula Norge AS | Wholesale & retail | 2006 |
| Jumpyard Snø AS | Arts & recreation | 2019 |
| Juto Bil AS | Wholesale & retail | 2023 |
| Jønk Triaden AS | Hospitality | 2023 |
| Jørgensen & Døtre AS | Real estate | 2007 |
| Jørn Grønningen AS | Administrative & support | 2025 |
| K by Kaos AS | Wholesale & retail | 2009 |
| K by Kaos Lørenskog AS | Wholesale & retail | 2021 |
| K by Kaos Online AS | Wholesale & retail | 2021 |
| K Poulsen Holding AS | Professional & scientific | 2009 |
| Kaffe Complete AS | Wholesale & retail | 2026 |
| Kaizer Holding AS | | 2022 |
| Kakudai Sushi AS | Hospitality | 2014 |
| Kals AS | Financial services | 2013 |
| Kam Triaden AS | Other services | 2025 |
| Kaoz Invest AS | Professional & scientific | 2021 |
| Karelson Holding AS | Construction | 2024 |
| Karelson Totalrenovering AS | Construction | 2024 |
| Karlstedt AS | Administrative & support | 2006 |
| Kars Norge AS | Real estate | 2004 |
| Kaszuba Holding AS | | 2022 |
| Kepenek Holding AS | | 2026 |
| Kero Kapital AS | Real estate | 2026 |
| Khalles Corner Metro AS | Hospitality | 2016 |
| Kia Bil Norge AS | Wholesale & retail | 1993 |
| Kid to Kid AS | Wholesale & retail | 2024 |
| Kings Da | Information & communication | 2006 |
| Kirkeby AS | Professional & scientific | 2003 |
| Kirkerud Eiendom AS | Real estate | 2024 |
| Kirkerud Skog 90/11 Da | Agriculture & fishing | 2012 |
| Kitchen Cater AS | Hospitality | 2024 |
| Kj-Ma System AS | Wholesale & retail | 1995 |
| Kjellergata 8B AS | Real estate | 2023 |
| Kjøkkenpartneren AS | Hospitality | 2025 |
| Kjør Regnskap AS | Professional & scientific | 2004 |
| Klinikk Mayro AS | Other services | 1997 |
| Klo Holding AS | | 2023 |
| KM Entreprenør AS | Construction | 2020 |
| Koblr AS | Information & communication | 2025 |
| Kokstaddalen 53 AS | Real estate | 2005 |
| Kongensgate Utvikling AS | Real estate | 2016 |
| Konsulent & Driftstjenester AS | Professional & scientific | 2016 |
| Kotmilo Gyros AS | Hospitality | 2025 |
| Kraftbjørn Ans | Administrative & support | 2002 |
| Kredittalliansen AS | | 2017 |
| Kronvega AS | Information & communication | 2023 |
| Kundigital AS | Professional & scientific | 2020 |
| Kvalheim Consulting AS | Professional & scientific | 2018 |
| Kvæfjord Holding AS | Financial services | 2020 |
| Kwality Pizza Da | Hospitality | 2001 |
| L&M Barberstua AS | Other services | 2022 |
| La Osteria Da | Hospitality | 2023 |
| La Pasta Kaffe Bar Da | Hospitality | 2000 |
| Laake Holding AS | | 2022 |
| Landaas Holding AS | | 2026 |
| Langsether Regnskap AS | Professional & scientific | 2017 |
| Larank Invest AS | Financial services | 2015 |
| Laustera Nuf | Construction | 2022 |
| Lauvåsen Bileiendom AS | Real estate | 2020 |
| Leas Verden AS | Wholesale & retail | 2002 |