| Igf Invest AS | | 2019 |
| Igma AS | Wholesale & retail | 1986 |
| Igma Holding AS | Wholesale & retail | 2005 |
| Igneum AS | Financial services | 2018 |
| Ihg Invest AS | | 2024 |
| Ihl AS | | 2021 |
| Ikaro Solutions AS | Professional & scientific | 2012 |
| Iki AS | Other services | 2014 |
| Ikon Bygg Og Eiendom AS | Real estate | 2001 |
| Ikr Holding AS | | 2022 |
| Ikura Invest AS | Professional & scientific | 2010 |
| Ikwi Invest AS | Financial services | 2005 |
| Imagine AS | Professional & scientific | 2009 |
| Imf Sunnmøre Holding AS | Wholesale & retail | 2018 |
| In-Cito AS | Real estate | 1987 |
| Incrementum Eiendom AS | Real estate | 2018 |
| Independent Consultants AS | Information & communication | 2024 |
| Indergaard Invest AS | | 2025 |
| Indian Masala House AS | Hospitality | 2025 |
| Indre Hanken Båtlag SA | Arts & recreation | 1983 |
| Industri Prosjekter AS | Professional & scientific | 2018 |
| Industritakst AS | Professional & scientific | 2020 |
| Industriveien 1A Eiendom AS | Real estate | 1996 |
| Infopartner AS | Information & communication | 1994 |
| Inga Holding AS | | 2023 |
| Inge Walderhaug Engineering AS | Professional & scientific | 2003 |
| Ingeniør Lauritz Nes AS | Professional & scientific | 1985 |
| Inger Anne Ulleberg AS | Real estate | 2000 |
| Ingrid Prytz Berset AS | Health & social care | 2020 |
| Ingrids Glassverksted-Fjordglass AS | Manufacturing | 2004 |
| Ininvest AS | | 2021 |
| Inja Holding AS | Real estate | 2013 |
| Inmarsat Solutions AS | Information & communication | 1992 |
| Inneklima Møre AS | Construction | 2022 |
| Inno AS | Professional & scientific | 1993 |
| Inno-Freeze AS | Administrative & support | 2004 |
| Innolipid AS | Professional & scientific | 2008 |
| Innotown AS | Administrative & support | 1999 |
| Innovasjonstolk AS | Education | 2025 |
| Inside Invest AS | Real estate | 2011 |
| Inste Hankane SA | Real estate | 2007 |
| Instrumenthuset AS | Real estate | 2011 |
| Intakt Bilskade Ålesund AS | Other services | 2025 |
| Inter-N Invest AS | Professional & scientific | 1997 |
| Intercare AS | Information & communication | 2007 |
| Intersport Rongve AS | Wholesale & retail | 2022 |
| Intrahouse AS | Information & communication | 2000 |
| Intrapublish AS | Information & communication | 2000 |
| Intraspider AS | Information & communication | 2000 |
| Inversion AS | Real estate | 2013 |
| Invest BKS AS | | 2021 |
| Investel AS | | 2019 |
| Investou AS | | 2020 |
| Invit Arkitekter AS | Professional & scientific | 2001 |
| Invit AS | Wholesale & retail | 1998 |
| Invo AS | Information & communication | 2004 |
| Inwestma AS | | 2024 |
| Io Byggservice AS | Administrative & support | 2021 |
| Iotera AS | Administrative & support | 2025 |
| Ipea AS | Administrative & support | 2012 |
| Isabella Invest AS | | 2023 |
| Isaksen Solutions AS | Arts & recreation | 2026 |
| Isildur AS | Professional & scientific | 2025 |
| Isna AS | Professional & scientific | 2014 |
| Italian Home AS | Wholesale & retail | 2014 |
| Itub AS | Administrative & support | 2010 |
| Itworx AS | Wholesale & retail | 2023 |
| Ivar Fagervoll Invest AS | Real estate | 2018 |
| Iålesund AS | Information & communication | 2025 |
| J Hagenæs Shipping AS | Transport & logistics | 1929 |
| J S Refsnæs AS | Wholesale & retail | 1940 |
| J Stølen Invest AS | Financial services | 2010 |
| J Weiberg Gulliksen AS | Manufacturing | 1997 |
| J&W Servering AS | Hospitality | 2012 |
| J. E. Koppernæs Invest AS | Real estate | 2005 |
| J. H. Holtet Holding AS | Construction | 2005 |
| J. Weiberg Gulliksen Holding AS | Manufacturing | 2018 |
| J.Heggelund Invest AS | | 2022 |
| J.S Invest AS | | 2022 |
| Jackson Design AS | Professional & scientific | 2022 |
| Jacu Drift AS | Manufacturing | 2021 |
| Jacu Eiendom AS | Real estate | 2021 |
| Jacu Holding AS | Manufacturing | 2021 |
| Jafi AS | Wholesale & retail | 2014 |
| Jahn Græsdal AS | | 2012 |
| Jakta Invest AS | Real estate | 2013 |
| Jamak AS | | 2025 |
| Jan Egil Holding AS | | 2025 |
| Jangaard Export AS | Manufacturing | 1988 |
| Jankes AS | Professional & scientific | 2024 |
| Jannicke Ose Holding AS | | 2022 |
| Jansen Elektro AS | Construction | 2011 |
| Janska Holding AS | | 2021 |
| Jari Invest AS | Real estate | 2020 |
| Jarnes Høye Invest AS | Health & social care | 2021 |
| Jarom Invest AS | Information & communication | 2010 |
| Jass Invest AS | | 2022 |
| Jem Trening AS | Other services | 2016 |
| Jenny Hatlehol AS | Administrative & support | 1987 |
| Jens Anders Kjersem AS | Health & social care | 1994 |