| Indrebø Gulvavretting AS | Construction | 2017 |
| Indreløpern AS | Administrative & support | 2003 |
| Industrigata 36 Lillehammer AS | Real estate | 2017 |
| Ing. Steinar Morken AS | Professional & scientific | 2006 |
| Ingwersen AS | Financial services | 2011 |
| Innlandet Bygg&Vedlikehold AS | Construction | 2025 |
| Innlandet Hus Og Hytte Service AS | Administrative & support | 2020 |
| Innlandet Industri Holding AS | Manufacturing | 2022 |
| Innlandet Kjøkkenforum AS | Wholesale & retail | 2003 |
| Innlandet Landskap AS | Construction | 2021 |
| Innlandet Landskapsutforming AS | Administrative & support | 2016 |
| Innlandet Miljøpark AS | Construction | 2017 |
| Innlandet Næringsmegling AS | Real estate | 2016 |
| Innlandet Retail AS | Wholesale & retail | 2022 |
| Innlandet Øyelegesenter Ans | Health & social care | 2019 |
| Innlandsgynekologen AS | Health & social care | 2017 |
| Innlandstakst AS | Professional & scientific | 2024 |
| Innovation Tools AS | Professional & scientific | 2024 |
| Instebakken AS | Real estate | 2016 |
| Interim Management AS | Real estate | 1998 |
| Invest R AS | Transport & logistics | 2024 |
| Investpowerfund AS | Professional & scientific | 2016 |
| Invio AS | Information & communication | 2021 |
| Isbukta AS | | 2014 |
| Istech AS | Professional & scientific | 2023 |
| Istind Eiendom AS | Real estate | 2006 |
| Itjenta AS | Information & communication | 2018 |
| Iver Sletten Invest AS | | 2023 |
| Iversengården AS | Real estate | 2021 |
| J & J Barlund Holding AS | Administrative & support | 2024 |
| J Holding AS | Professional & scientific | 2002 |
| J&S Properties AS | Real estate | 2000 |
| J. Frisenberg AS | Wholesale & retail | 2009 |
| Jabalais AS | Real estate | 2007 |
| Jakov Bygg Service AS | Construction | 2024 |
| Jakt Og Skytterbua Da | Wholesale & retail | 2003 |
| Japan Sushi AS | Hospitality | 2018 |
| Jarles Pumpebil Service AS | Administrative & support | 2026 |
| Jas Maskin Og Service AS | Administrative & support | 2016 |
| JBT-1 AS | Real estate | 2025 |
| Je Bygg AS | Real estate | 2025 |
| Jeh-Invest AS | | 2025 |
| Jehans Holding AS | Wholesale & retail | 2021 |
| Jeistad Entreprenør AS | Construction | 2017 |
| Jeshol AS | Real estate | 2008 |
| Jevnesveen Holding AS | | 2020 |
| JFB 203 Holding AS | | 2023 |
| JJ Phaco AS | Health & social care | 2021 |
| Jj-Holding AS | Health & social care | 2021 |
| JMR AS | Education | 2022 |
| Jo H. Lunde AS | Professional & scientific | 2012 |
| Jo Lunde AS | Professional & scientific | 2021 |
| Jobbteam AS | Administrative & support | 2017 |
| Jobond Fysioterapi AS | Health & social care | 2020 |
| Johan Høst AS | Arts & recreation | 2022 |
| Johannessen Creative AS | Professional & scientific | 2023 |
| John-Johnstad Holding AS | | 2024 |
| Joint Survey Group AS | Professional & scientific | 2025 |
| Jon Kaulum Transport AS | Transport & logistics | 2003 |
| Jonas Øglænd Holding AS | Real estate | 1985 |
| Jtaa Holding AS | Wholesale & retail | 2008 |
| Juel Andersen AS | | 2019 |
| Jørgen Brabrand AS | Health & social care | 2015 |
| Jørn Bakkeli AS | Transport & logistics | 2005 |
| K&V Sagbakken Holding AS | | 2025 |
| Kador AS | Construction | 2009 |
| Kafe Fønix AS | Hospitality | 2024 |
| Kaffebar AS | Hospitality | 2017 |
| Kagal AS | Hospitality | 2025 |
| Kagse AS | Real estate | 2014 |
| Kamakino AS | Administrative & support | 2026 |
| Kammerset Studio AS | Professional & scientific | 2026 |
| Kang Holding AS | Financial services | 2020 |
| Kantall AS | Professional & scientific | 1993 |
| Kantall Kompetanse AS | Professional & scientific | 2023 |
| Kanthaugen Eiendom AS | Real estate | 2023 |
| Karv AS | Professional & scientific | 2022 |
| Katten Holding AS | Real estate | 2005 |
| Katzo Drift AS | Administrative & support | 2011 |
| Kaulum Utvikling AS | Real estate | 2020 |
| Kaure AS | Real estate | 2023 |
| Kaus Vann Og Kloakk AS | Construction | 1995 |
| Kay & Erlend Games AS | Information & communication | 2025 |
| KBM Kåre Fredbo AS | Manufacturing | 1993 |
| KCR Lillehammer AS | Hospitality | 2013 |
| Kerico AS | Financial services | 2013 |
| Kerico Consulting AS | | 2014 |
| Kewa Invest AS | Real estate | 1964 |
| Killi Holding AS | | 2017 |
| Kim Eiendom AS | Real estate | 2007 |
| Kim J Holding AS | Real estate | 2020 |
| Kim Johannesen AS | Construction | 2013 |
| Kindlistuen Invest AS | Other services | 2023 |
| Kinstad Haugen AS | Real estate | 2023 |
| Kioskdrift Krukjordet AS | Wholesale & retail | 2025 |
| Kirkegata 53 Lillehammer AS | Manufacturing | 2000 |
| Kirkerud Invest AS | | 2005 |
| Kittilfall AS | Information & communication | 2007 |
| Kjell Åge Skyttermoen AS | Real estate | 1975 |
| Kjemelch AS | Other services | 2012 |