| Inkaway AS | Health & social care | 2017 |
| Inko Holding Gjøvik AS | Health & social care | 2011 |
| Innlandet Boligprosjekt AS | Real estate | 2019 |
| Innlandet Boligutvikling AS | Real estate | 2022 |
| Innlandet Eiendom 1 AS | Real estate | 2019 |
| Innlandet Eiendomsutleie AS | Real estate | 2021 |
| Innlandet Fasade AS | Administrative & support | 2023 |
| Innlandet Flis & Mur AS | Construction | 2020 |
| Innlandet Forsikring AS | Financial services | 2024 |
| Innlandet Gastrosenter AS | Health & social care | 2025 |
| Innlandet Helsehus AS | Real estate | 2024 |
| Innlandet Holding AS | Wholesale & retail | 2005 |
| Innlandet Hudklinikk AS | Other services | 2019 |
| Innlandet Maling Og Brannsikring AS | Construction | 2026 |
| Innlandet Næringsutvikling AS | Real estate | 2013 |
| Innlandet Service & Vedlikehold AS | Real estate | 2013 |
| Innlandet Tak Og Bygg AS | Construction | 2021 |
| Innlandet Takstservice AS | Real estate | 2022 |
| Innlandet Teknikk- Og Bim-Consult AS | Professional & scientific | 2025 |
| Innlands Bil AS | Wholesale & retail | 2019 |
| Innlandsklima AS | Construction | 2024 |
| Innlandsmessa AS | Administrative & support | 2019 |
| Innovasjonsteknikk AS | Professional & scientific | 2020 |
| Inpublic AS | Professional & scientific | 2017 |
| Inter M Eiendom AS | Real estate | 2002 |
| Inter Revisor AS | Professional & scientific | 2005 |
| Inter-Medical AS | Wholesale & retail | 1989 |
| Interiørhuset Gjøvik AS | Wholesale & retail | 2017 |
| Interiørtre AS | Wholesale & retail | 2015 |
| Inventum Øst AS | Wholesale & retail | 1988 |
| INVEST1 AS | Professional & scientific | 2013 |
| Investeringspartner Gjøvik AS | Real estate | 2011 |
| IP Systems AS | Manufacturing | 2017 |
| Irgens Holding AS | Professional & scientific | 2021 |
| Iris Dame Og Herrefrisør AS | Other services | 2018 |
| Isak Holding AS | Education | 2005 |
| IT Innlandet AS | Information & communication | 2026 |
| Ithelps Invest AS | Health & social care | 2022 |
| Ixt AS | Information & communication | 2024 |
| Jaau Holding AS | Financial services | 2005 |
| Jab Holding 2 AS | | 2023 |
| Jab Holding AS | | 2023 |
| Jaf Arkitektkontor AS | Professional & scientific | 2013 |
| Jaf Holding AS | Professional & scientific | 2005 |
| Jako Sushi AS | Hospitality | 2019 |
| Jan Merok Paulsen AS | Professional & scientific | 2019 |
| Jan&Co AS | | 2014 |
| Jark Bygg AS | Construction | 2022 |
| Jark Eiendom AS | Real estate | 2018 |
| Jaroma AS | | 2023 |
| Jeanette Amundsen AS | Wholesale & retail | 2022 |
| Jeg Bygg AS | Construction | 2017 |
| Jeinvest AS | Financial services | 2013 |
| Jela AS | Real estate | 2021 |
| Jemtland AS | Manufacturing | 1989 |
| Jemtland Bygg AS | Real estate | 2006 |
| Jemtland Eiendom AS | Real estate | 1967 |
| Jemtland Holding AS | Real estate | 2005 |
| Jernbanegata 4 AS | Real estate | 1997 |
| Jessheim Handelseiendom AS | Real estate | 2013 |
| Jima Invest AS | Real estate | 2017 |
| Jippi Jay Holding AS | | 2020 |
| Jite Invest AS | Real estate | 2005 |
| JK Anlegg AS | Construction | 2016 |
| Jmha AS | Real estate | 2005 |
| Jo & Djuve AS | Professional & scientific | 2021 |
| Jobr AS | Information & communication | 2022 |
| John Berg AS | Financial services | 2008 |
| Johnsen Media AS | Information & communication | 2022 |
| Johnsen, Johnsen, Johnsen & Johansen AS | Professional & scientific | 2022 |
| Johs Olsen AS | Wholesale & retail | 1998 |
| Johs Olsen Eiendom AS | Real estate | 1975 |
| Johs Olsen Handel AS | Wholesale & retail | 2021 |
| Johs Olsen Holding AS | Wholesale & retail | 2005 |
| Jon Myrvang AS | Real estate | 2009 |
| Jon Sunds Veg 18 Elverum AS | Real estate | 2024 |
| Josefine Gjøvik AS | Wholesale & retail | 2020 |
| Jostad AS | Real estate | 1987 |
| Jostad Elektriske AS | Construction | 1993 |
| Joti Business Partner AS | Administrative & support | 2021 |
| JPD Norge AS | Wholesale & retail | 2013 |
| Jsjs Invest AS | | 2026 |
| JTR Holding AS | | 2005 |
| Jubel Event AS | Professional & scientific | 2003 |
| Jung Da | Information & communication | 2021 |
| Juusgartner AS | Wholesale & retail | 2010 |
| Jømio AS | Construction | 2021 |
| Jørgen Moes Gate AS | Real estate | 2022 |
| Jørn Reiner AS | | 2019 |
| K&R Servering AS | Hospitality | 2023 |
| K-T Invest AS | Wholesale & retail | 2007 |
| K. Amundsen Holding AS | Wholesale & retail | 2005 |
| Kaffe Arkitektur & Design AS | Professional & scientific | 2025 |
| Kai Canari Holding 3 AS | Real estate | 2020 |
| Kai Canari Holding AS | Administrative & support | 2013 |
| Kai Canari Invest AS | Real estate | 2025 |
| Kai Gran Invest AS | Real estate | 2005 |
| Kaimana AS | | 2025 |
| Kaizen Investering AS | | 2026 |
| Kaken AS | | 2026 |