| Hyld Holding AS | Real estate | 2022 |
| Hyperborea Ans | Administrative & support | 1998 |
| Hågensen Eiendom Alta AS | Real estate | 2022 |
| Hågensen Holding Alta AS | Transport & logistics | 2022 |
| Hågensen Invest AS | | 2023 |
| Hågensen Kran Og Transport AS | Transport & logistics | 2022 |
| Håkon Nilsen Invest AS | | 2005 |
| Hårek AS | Other services | 1996 |
| Hårlykke AS | Other services | 2023 |
| Hætta Holding AS | Information & communication | 2018 |
| Høyden Alta AS | Real estate | 2011 |
| Høyvikbåen AS | Agriculture & fishing | 2015 |
| I Gir AS | Wholesale & retail | 2017 |
| I Kleven Holding AS | Construction | 2023 |
| Iame Holding AS | Agriculture & fishing | 2023 |
| Ice Vision Da | Wholesale & retail | 2020 |
| Icecube of Aurora AS | Agriculture & fishing | 2010 |
| Idsi Invest AS | Education | 2025 |
| Idsi Kompetanse AS | Education | 2025 |
| Igh Holding AS | | 2026 |
| Igh Kystfiske AS | Agriculture & fishing | 2026 |
| Ih Consulting AS | Professional & scientific | 2017 |
| Ik Nord AS | Real estate | 2020 |
| Ikon Systemer Ans | Information & communication | 1992 |
| Ikt Alta AS | Information & communication | 2020 |
| Im Knutsen Holding AS | | 2025 |
| Imbp AS | | 2023 |
| Imge Helse AS | Health & social care | 2012 |
| Imj Eiendom AS | Real estate | 2012 |
| Imj Invest AS | Real estate | 2010 |
| Imj Utvikling AS | Real estate | 2011 |
| In North AS | Arts & recreation | 2018 |
| Incolise AS | Wholesale & retail | 2021 |
| Industri Hjælpern AS | Construction | 2017 |
| Industrifeldt Eiendom AS | Real estate | 2010 |
| Industrihøyden 2 AS | Real estate | 1993 |
| Industrihøyden 20 AS | Real estate | 2025 |
| Infura AS | Construction | 2020 |
| Infuze AS | Information & communication | 2025 |
| Ing. Vidar Nilsen AS | Professional & scientific | 2015 |
| Ingeniør Abu AS | Professional & scientific | 2015 |
| Innopro AS | Construction | 2011 |
| Inspira Eiendom AS | Real estate | 2021 |
| Inspira Eiendom Da | Real estate | 2005 |
| Inspire Hypnose AS | Other services | 2024 |
| Inspirerende Holding AS | | 2022 |
| Interprint AS | Wholesale & retail | 2015 |
| Intership Norge AS | Transport & logistics | 2013 |
| Intraport AS | Information & communication | 2015 |
| Ir Kontroll AS | Professional & scientific | 2014 |
| Irma's Vask & Fix AS | Administrative & support | 2015 |
| Isabel Invest AS | Transport & logistics | 1989 |
| Isak Regnskap AS | Professional & scientific | 2017 |
| Isaksen Salg Og Montering AS | Wholesale & retail | 2015 |
| Iseverinsen AS | Financial services | 2012 |
| Ishavskraft AS | Energy | 1997 |
| Ishavslink AS | Information & communication | 2004 |
| Ishavsveien AS | Energy | 2026 |
| Isi Renhold AS | Administrative & support | 2003 |
| Isobygg Vest-Finnmark AS | Construction | 2018 |
| IT Nord AS | Wholesale & retail | 2006 |
| Itmv Holding AS | | 2021 |
| J.H. Haugan Holding AS | | 2021 |
| J.Hanssen AS | Manufacturing | 2007 |
| J.M Bygg AS | Construction | 2012 |
| J.M Holding AS | Construction | 2017 |
| J.O Rør AS | Construction | 2025 |
| Jaco Elektro AS | Construction | 2000 |
| Jactus Medical Services AS | Health & social care | 2017 |
| Jaka Norway AS | Real estate | 2012 |
| Jakobsen Maskinutleie AS | Administrative & support | 2019 |
| Jan Fredrik Holten Eiendom AS | Real estate | 2014 |
| Jan Opgård AS | Construction | 2020 |
| Jan Opgård Invest AS | Arts & recreation | 2005 |
| Janeir AS | Agriculture & fishing | 2025 |
| Jaro AS | Manufacturing | 1996 |
| Jaro Transport AS | Transport & logistics | 2023 |
| JDG Services AS | Transport & logistics | 2021 |
| Jeje Holding AS | Real estate | 2018 |
| Jensen Elektro AS | Construction | 2005 |
| Jernveien 10 AS | Real estate | 2023 |
| Jernveien 5 AS | Real estate | 2022 |
| Jernveien 8 AS | Real estate | 2024 |
| Jernveien Eiendom AS | Real estate | 2022 |
| Jetro Holding AS | Real estate | 2013 |
| Jevold AS | Financial services | 2010 |
| JFK Revisjon AS | Professional & scientific | 2026 |
| JG Maling AS | Construction | 2024 |
| JHJ Invest AS | | 2020 |
| Jht-Maskin AS | Construction | 2007 |
| Jkho Holding AS | | 2024 |
| JLW Holding AS | | 2023 |
| Jme Eiendom AS | Real estate | 2022 |
| Jmedlie Holding AS | | 2024 |
| JMM Bygg AS | Construction | 2019 |
| JN Fisk AS | Agriculture & fishing | 2025 |
| Joakim Opgård Holding AS | Real estate | 2019 |
| Johannesgården SA | Real estate | 1988 |
| Johannessen Transport & Utleie AS | Transport & logistics | 2023 |
| Johansen Eiendom AS | Real estate | 1993 |