| Hydro-X AS | Administrative & support | 2025 |
| Hymas AS | Wholesale & retail | 1995 |
| Hymax AS | Wholesale & retail | 1990 |
| Håven Invest AS | Construction | 2016 |
| Høitomt Service AS | Manufacturing | 2024 |
| Høyberg Eiendom AS | Real estate | 2026 |
| Høyberg Invest AS | | 2025 |
| Høyen Drift AS | Professional & scientific | 1977 |
| Høyen Eiendom AS | Real estate | 2016 |
| Høyen Utleie AS | Real estate | 2018 |
| Høyen Utvikling AS | Real estate | 2017 |
| Høyer Gjøvik AS | Wholesale & retail | 2023 |
| Høyer Lillehammer AS | Wholesale & retail | 2023 |
| I. S. Frisør AS | Other services | 2005 |
| I. Svalstad Holding AS | | 2023 |
| Icon Holding AS | | 2018 |
| Idle Invest AS | Real estate | 2015 |
| Ignivis Holding AS | | 2026 |
| In Bolig AS | Real estate | 2019 |
| In Eiendom AS | Construction | 1990 |
| In Storage AS | Real estate | 2023 |
| Indivudali Imone JVH | Administrative & support | 2006 |
| Industrigata Eiendom AS | Real estate | 1988 |
| Inferrum AS | Manufacturing | 2023 |
| Ingeniørhuset AS | Real estate | 1998 |
| Ingvaldsen AS | Manufacturing | 2018 |
| Ingvaldsen Mek Eiendom AS | Real estate | 2019 |
| Ingvaldsen Mekaniske AS | Manufacturing | 2018 |
| Ingve Undheim AS | Construction | 2017 |
| Inn I Skauen AS | Arts & recreation | 2025 |
| Innlandet Bolig & Eiendomsutvikling AS | Real estate | 2019 |
| Innlandet Bolig & Utleie AS | Real estate | 2020 |
| Innlandet Byggtjenester AS | Construction | 2021 |
| Innlandet Caravanservice AS | Other services | 2025 |
| Innlandet Eiendomsutvikling AS | Real estate | 1997 |
| Innlandet Entreprenør AS | Construction | 2018 |
| Innlandet Entreprenørsupport AS | Professional & scientific | 2019 |
| Innlandet Mynthandel AS | Wholesale & retail | 2023 |
| Innlandet Takstforretning AS | Professional & scientific | 2022 |
| Innlandet Utleiebolig AS | Real estate | 2020 |
| Innlandsmat AS | Wholesale & retail | 2014 |
| Innlandsutvikling AS | Real estate | 1996 |
| Innovamed AS | Information & communication | 2025 |
| Innrom AS | Professional & scientific | 2009 |
| Intrac AS | Real estate | 2022 |
| Invest Innlandet AS | Real estate | 2012 |
| Isoco Eiendom AS | Construction | 2004 |
| Isofill AS | Construction | 2026 |
| Itm AS | Manufacturing | 2015 |
| Itte Håndverkstjenester AS | Professional & scientific | 2021 |
| Iungo AS | Real estate | 2019 |
| Iva Holding AS | Real estate | 2024 |
| Ivar Henriksen Eiendom AS | Real estate | 2017 |
| Iveta Maler AS | Construction | 2023 |
| J-E Nygård Invest AS | | 2022 |
| J.Hovde Holding AS | | 2021 |
| J.R Holding AS | | 2022 |
| Jan Erik Løkken AS | Transport & logistics | 2012 |
| Jan Grønvold Invest AS | | 2024 |
| JBL Holding AS | Health & social care | 2007 |
| JDH AS | | 2022 |
| Jedin Holding AS | | 2019 |
| Jemtland Samdrift Da | Agriculture & fishing | 2004 |
| Jemtlandsvegen 1 AS | Real estate | 2015 |
| Jemtlandsvegen 12 AS | Real estate | 2026 |
| Jernbanevegen 35 AS | Real estate | 2025 |
| Jerngrep Holding AS | Wholesale & retail | 2016 |
| Jhvg Holding AS | | 2021 |
| Jmi Holding AS | Construction | 2007 |
| Johnsrud Invest AS | Real estate | 2005 |
| Jon Sørby Invest AS | Professional & scientific | 2023 |
| Jonsdal Invest AS | | 2022 |
| Jonther Eiendom AS | Real estate | 2020 |
| JP Utleie AS | Administrative & support | 2025 |
| K & D Holding AS | | 2022 |
| K - R Maskin Da | Construction | 2012 |
| K F Invest AS | Real estate | 2015 |
| K-T Regnskap AS | Professional & scientific | 2015 |
| Kafé-Mølla AS | Hospitality | 2023 |
| Kag Eiendom AS | Real estate | 2019 |
| Kakorri AS | Information & communication | 2024 |
| Kartal Holding AS | Real estate | 2025 |
| Katzoo Dyrenes Verden AS | Wholesale & retail | 2005 |
| KB Agro Da | Agriculture & fishing | 2018 |
| Kb.Gti AS | Real estate | 2015 |
| KCR Brumunddal AS | Hospitality | 2010 |
| Keysers Gate 4 AS | Real estate | 2020 |
| Kfhøyen Holding AS | Financial services | 2017 |
| Khkulturverksted AS | Arts & recreation | 2015 |
| Kilde Vannverk SA | Water & waste | 2019 |
| Kiropraktor Brumunddal AS | Health & social care | 2003 |
| Kiropraktor Hamar AS | Health & social care | 2020 |
| Kiropraktor Innlandet AS | Health & social care | 2003 |
| Kjetil Granli Holding AS | | 2026 |
| Kjøpstad AS | Real estate | 2005 |
| Kjøøøh AS | Real estate | 2023 |
| Klairiq AS | Professional & scientific | 2026 |
| Klima Nor AS | Wholesale & retail | 1994 |
| KMJ Holding AS | Real estate | 2021 |
| Koan Appartement AS | Hospitality | 2002 |