| Inegre AS | Other services | 1990 |
| Infra Partner AS | Professional & scientific | 2021 |
| Ing. Hvassing AS | Real estate | 2009 |
| Ing. J Wiik AS | | 2016 |
| Ingebrigtsen Holding AS | Financial services | 2010 |
| Ingeniør Gunnar Ueland AS | Professional & scientific | 2003 |
| Ingeniør K.Arntsen AS | Professional & scientific | 2007 |
| Ingeniørgården Bodø AS | Real estate | 2006 |
| Ingjerd Arnøy AS | Wholesale & retail | 2026 |
| Ingma Invest AS | Financial services | 2005 |
| Ingrid Bech AS | Financial services | 2015 |
| Ingrid Oline AS | Professional & scientific | 2018 |
| Initialpoint AS | Information & communication | 2019 |
| Innbo AS | Real estate | 2013 |
| Inndyr Eiendomsutvikling AS | Real estate | 2020 |
| Innpå AS | Other services | 2024 |
| Innstranda Eiendom AS | Real estate | 2016 |
| Innstranda Legesenter AS | Health & social care | 2015 |
| Innstrandveien 1 AS | Real estate | 2026 |
| Inovacare AS | Professional & scientific | 2026 |
| Installatørgruppen AS | | 2026 |
| Inter 2 AS | Real estate | 2006 |
| Inter Invest AS | Real estate | 1990 |
| Inter Invest Holding AS | Real estate | 2005 |
| Interbygg Nord AS | Construction | 2020 |
| Interiørarkitekt Mnil Stina Leivseth AS | Professional & scientific | 2012 |
| Internetwork AS | Wholesale & retail | 2017 |
| Intersport Bodø AS | Wholesale & retail | 1984 |
| Intertrykk AS | Manufacturing | 2020 |
| Intertrykk Da | Professional & scientific | 2009 |
| Intune AS | Wholesale & retail | 1998 |
| Intérieur AS | Other services | 2022 |
| Invenor AS | | 1995 |
| Investor KTL AS | Financial services | 2016 |
| Investor Vei AS | Real estate | 2016 |
| Inwestermann AS | Information & communication | 2021 |
| Iph AS | Real estate | 2018 |
| Iris Produksjon AS | Water & waste | 2005 |
| Iris Service AS | Water & waste | 2001 |
| Isabella Beauty AS | Wholesale & retail | 2016 |
| Isbre Heim AS | Real estate | 2022 |
| Ishuset AS | Real estate | 2011 |
| Ishuset Eiendom AS | Construction | 2009 |
| Isoenergi Salten AS | Construction | 2022 |
| Issi Utvikling AS | Real estate | 2020 |
| Itet AS | Real estate | 2017 |
| Ivar Grundstad Eiendom AS | Real estate | 2005 |
| Ivar Jørgensen Invest AS | Financial services | 2005 |
| Ivera AS | Arts & recreation | 2024 |
| J. Jakhelln Holding AS | Real estate | 2019 |
| J.B.S. Invest AS | Information & communication | 2024 |
| Ja Johansen Holding AS | | 2018 |
| Ja Sjåførtjenester AS | Transport & logistics | 2026 |
| Jacob Klette Optikk AS | Wholesale & retail | 2005 |
| Jacwest Holding AS | Real estate | 2016 |
| Jahpron AS | Real estate | 1993 |
| Jahpron Nordic AS | Wholesale & retail | 1989 |
| Jakhelln Brygge AS | Real estate | 2001 |
| Jakhellngården AS | Real estate | 2018 |
| Jaktkompis AS | Wholesale & retail | 2026 |
| Jamaica Invest AS | Wholesale & retail | 2021 |
| Jamo Eiendom AS | Real estate | 1997 |
| Jan Helgesen AS | Wholesale & retail | 2000 |
| Jan Robert Ovesen AS | Construction | 2005 |
| Janka Holding AS | Real estate | 2023 |
| Jaro Nor Da | Wholesale & retail | 2011 |
| Jask AS | Health & social care | 2020 |
| Jatakk Holding AS | | 2014 |
| Jatakk Utvikling AS | Real estate | 2026 |
| Jatao Holding AS | Health & social care | 2024 |
| Jato AS | Real estate | 1985 |
| JB Reklame AS | Manufacturing | 1993 |
| Jci Eiendom AS | Real estate | 1995 |
| Jci Invest AS | Manufacturing | 2019 |
| Jej Holding AS | Financial services | 2005 |
| Jens Einar Johansen AS | | 2021 |
| Jensen Flis AS | Construction | 2019 |
| Jenssen Eiendom AS | Real estate | 2002 |
| Jensvold Snekkerservice AS | Construction | 2015 |
| Jensvoll Barnehage AS | Education | 2006 |
| Jensvoll Eiendom AS | Real estate | 2006 |
| Jensvoll Fysioterapi AS | Health & social care | 2019 |
| Jensvolldalen AS | Real estate | 2007 |
| Jernbaneveien 2 AS | Real estate | 2006 |
| Jes Finans AS | | 2024 |
| Jfon Technology Holding AS | | 2023 |
| Jianlong Norway AS | Professional & scientific | 2025 |
| JL Malerservice AS | Construction | 2023 |
| JLK Offshore AS | Administrative & support | 2016 |
| JLP Holding AS | Financial services | 2024 |
| JMB Invest AS | Real estate | 2005 |
| JMB Maskin AS | Construction | 2021 |
| JN Tømrerservice AS | Construction | 2024 |
| JNB AS | | 2025 |
| Jnilsen Holding AS | | 2020 |
| Joachims Rykk Og Napp AS | Agriculture & fishing | 2022 |
| Jodal Maskin AS | Transport & logistics | 2015 |
| Joe Invest AS | Financial services | 2005 |
| Jofu Invest AS | | 2020 |
| Johan André AS | | 2019 |