| Invat 466 Holding AS | Education | 2023 |
| Inventa Finans AS | | 2012 |
| Inventel AS | Real estate | 1990 |
| Inventor Chemical Tankers AS | Transport & logistics | 2013 |
| Inventor Eiendommer AS | Real estate | 1986 |
| Inventor Shipping AS | Transport & logistics | 1989 |
| Inventura Advokat AS | Professional & scientific | 2010 |
| Inventura AS | Professional & scientific | 2001 |
| Inventura Partner AS | Professional & scientific | 2020 |
| Inventure Management AS | Professional & scientific | 2008 |
| Invercode AS | Information & communication | 2014 |
| Invest En AS | Real estate | 2004 |
| Investeringsklubben Nhhs AS | Education | 2006 |
| Investify AS | | 2025 |
| Investio AS | | 2018 |
| Investogfix AS | | 2020 |
| Investorgruppen AS | Real estate | 2011 |
| Investrheim Holding AS | Administrative & support | 2022 |
| Invext AS | Real estate | 2008 |
| Invictus AS | Real estate | 2017 |
| Invy AS | Wholesale & retail | 2020 |
| Ion Engineering Norway AS | Professional & scientific | 2016 |
| IP Holding AS | Real estate | 2005 |
| Ipa - Invest AS | | 2023 |
| Ipam Holding AS | Real estate | 2008 |
| Iq Systems AS | Information & communication | 2018 |
| Irarema AS | | 2020 |
| Irenes Hårstudio AS | Other services | 2019 |
| Iris Ad Horizon AS | Professional & scientific | 2024 |
| Iris AS | Health & social care | 1995 |
| Iris Eiendom Bergen AS | Real estate | 2009 |
| Irl Enterprise AS | Wholesale & retail | 2025 |
| Isabella Holding AS | | 2021 |
| Isager Holding AS | Financial services | 2018 |
| Isaksh AS | | 2023 |
| Isdal Consult AS | Professional & scientific | 1996 |
| Isdalen Agentur Da | Administrative & support | 2022 |
| Ishi Energy AS | Energy | 2026 |
| Isinvest AS | Financial services | 1997 |
| Iska Capital AS | | 2021 |
| Iskald Holding AS | Real estate | 2021 |
| Iskender AS | Hospitality | 2025 |
| Isotag AS | Professional & scientific | 2020 |
| Isotag Holding AS | Professional & scientific | 2020 |
| Isource AS | Professional & scientific | 2008 |
| Istad Invest AS | Real estate | 2018 |
| Isv Holding AS | Financial services | 2005 |
| IT Drift Norge AS | Wholesale & retail | 2008 |
| IT Kids AS | Wholesale & retail | 2019 |
| IT Service Bergen AS | Information & communication | 2016 |
| IT Services AS | Information & communication | 2024 |
| Ita Travel AS | Administrative & support | 2022 |
| Itact Solutions AS | Professional & scientific | 2025 |
| Italia Pizzeria AS | Hospitality | 2023 |
| Itaste AS | Administrative & support | 2024 |
| Itc Eiendom AS | Real estate | 2025 |
| Itouch Norge Da | Information & communication | 2001 |
| Itsbjo AS | | 2018 |
| Itslearning AS | Information & communication | 1999 |
| Ivar Gaustad Malerservice AS | Construction | 2015 |
| Iver Norge AS | Information & communication | 2000 |
| Iwatch AS | Professional & scientific | 2005 |
| Ix Drift AS | Real estate | 2017 |
| J Cooper Consultants AS | Professional & scientific | 2020 |
| J D Finans & Eiendom AS | Real estate | 2002 |
| J E Greve AS | Real estate | 1969 |
| J Gran & Co AS | Transport & logistics | 1985 |
| J H Vågenes Holding AS | | 2020 |
| J Holsvik Invest AS | Real estate | 2013 |
| J Nordic AS | Professional & scientific | 2014 |
| J&S Holding AS | Hospitality | 2024 |
| J-C Holding AS | | 2025 |
| J. Berstad Eiendom 2 AS | Administrative & support | 2023 |
| J. H. Nordeide AS | Wholesale & retail | 2004 |
| J. Martens AS | | 2009 |
| J. O. Invest AS | Transport & logistics | 2015 |
| J. Salomon AS | Health & social care | 2022 |
| J. Solbakken Invest AS | | 1999 |
| J.E.T. AS | Professional & scientific | 2019 |
| J.N. Bygg AS | Real estate | 2016 |
| Ja Wikholm Holding AS | | 2022 |
| Jacob Kjødes Eiendom AS | Real estate | 2016 |
| Jacobs Retail AS | Wholesale & retail | 2019 |
| Jahnebakken Holding AS | | 2023 |
| Jahren Overflate AS | Construction | 2022 |
| Jaki Holding AS | Real estate | 2005 |
| Jakmo AS | | 2022 |
| Jakob Dahl Mejrup AS | Wholesale & retail | 2017 |
| Jakob Myklebust AS | Arts & recreation | 2019 |
| Jakops Invest AS | | 2010 |
| Jaky AS | Real estate | 2019 |
| Jalms Holding AS | Real estate | 2021 |
| Jammer Holding AS | | 2023 |
| Jan Fasteland AS | Wholesale & retail | 2024 |
| Jan Gunnar Kaaresen Consulting AS | Professional & scientific | 2012 |
| Jan Lingjerde AS | Real estate | 1964 |
| Janaflaten 28 AS | Real estate | 2005 |
| Janaflaten 37 AS | Real estate | 1998 |
| Janaflaten 39 AS | Real estate | 1945 |
| Janaflaten Eiendom 10 AS | Real estate | 2018 |