| Innlandet Solskjerming AS | Wholesale & retail | 2026 |
| Insane Architects AS | Professional & scientific | 2023 |
| Intek Automatisering AS | Manufacturing | 2006 |
| Intelli AS | Professional & scientific | 2012 |
| Inter Regnskap Og Data AS | Professional & scientific | 2011 |
| Intercargo Norge Norsk Avdeling Av Utenlandsk Foretak Nuf | Transport & logistics | 1998 |
| Intercargo Sil Ro Norway Nuf | Transport & logistics | 2020 |
| INTERFERENS HOLOGRAFISK DA Museum Galleri Studio | Information & communication | 1989 |
| Interim AS | Real estate | 2006 |
| Ismato AS | Real estate | 2017 |
| Italia Hamar AS | Hospitality | 2019 |
| Itosh Invest AS | Financial services | 2017 |
| Jac Skilt-Reklame AS | Professional & scientific | 2021 |
| Jac Tepper Ans | Wholesale & retail | 1986 |
| Jacobsense Holdings AS | | 2023 |
| Jagiellonaire AS | | 2026 |
| Jahre Motor Hamar AS | Wholesale & retail | 1984 |
| Jajo Invest AS | Real estate | 2001 |
| Jan Invest Holding AS | Real estate | 2005 |
| Jan Larsen Strategisk Rådgivning AS | Professional & scientific | 2012 |
| Jan Og Lenes Trafikkskole Ans | Education | 1998 |
| Jannicke M. Hagen AS | Wholesale & retail | 2020 |
| Japansushi AS | Hospitality | 2018 |
| JBP Malerservice AS | Construction | 2025 |
| JCB Invest AS | | 2025 |
| Jendal Eiendom AS | Real estate | 2015 |
| Jens Olai AS | Professional & scientific | 2014 |
| Jensen AS | Real estate | 2019 |
| Jetjager AS | Wholesale & retail | 2026 |
| JHJ Holding AS | Real estate | 2005 |
| Jhpl Holding AS | Professional & scientific | 2020 |
| Jka Invest AS | | 2018 |
| JL Montasje Og Service AS | Construction | 2025 |
| JM Holding AS | Real estate | 2025 |
| Johansson AS | Professional & scientific | 2021 |
| John B AS | Hospitality | 2020 |
| Johnér Norge AS | Administrative & support | 2012 |
| Jordbærpikene Hamar AS | Hospitality | 2014 |
| Jorkjend Holding AS | Real estate | 2007 |
| Jotunheimen Eiendom AS | Real estate | 2001 |
| Jpa Forge AS | Information & communication | 2026 |
| JSD Holding 2 AS | | 2022 |
| JSD Holding AS | | 2021 |
| JST Invest AS | Real estate | 2005 |
| Juko Invest AS | Real estate | 2005 |
| Just Brochsgate 12 Eiendom AS | Real estate | 2016 |
| Juvo Eiendom AS | Real estate | 2005 |
| Jwo Holding AS | | 2019 |
| Jysk Cater A/S | Hospitality | 2000 |
| K a Rasmussen AS | Manufacturing | 1969 |
| K. Bakke Eiendommer AS | Real estate | 1996 |
| K. Blystad Holding AS | | 2022 |
| Kaabe Kapital AS | | 2023 |
| Kaffeselskapet AS | Wholesale & retail | 1995 |
| Kamakchya Investing AS | Information & communication | 2024 |
| Kamera 2 Hamar AS | Information & communication | 2003 |
| Kankode AS | Information & communication | 2016 |
| Kaolila AS | Professional & scientific | 2013 |
| Kapamara Invest AS | Professional & scientific | 2016 |
| Karin Holding AS | Financial services | 2005 |
| Karkirurgen AS | Health & social care | 2016 |
| Karlsvogna Invest AS | Real estate | 2015 |
| Karlsvognen Holding AS | Professional & scientific | 2005 |
| Karosseridoktor AS | Other services | 2008 |
| Karsberg Capital AS | | 2025 |
| Karsberg Care AS | Health & social care | 2025 |
| Karsberg Creative Labs AS | Professional & scientific | 2026 |
| Karsberg Invest AS | | 2025 |
| Karsberg Living AS | Real estate | 2026 |
| Kartlagt SA | Information & communication | 2010 |
| Kaw Invest AS | Professional & scientific | 2025 |
| Kian Fashion AS | Transport & logistics | 2014 |
| Kick AS | Administrative & support | 2021 |
| Kildegruppen AS | Information & communication | 1964 |
| Kimpot AS | Financial services | 2006 |
| Kine Lien Holding AS | | 2020 |
| Kiosk Monsen AS | Wholesale & retail | 2020 |
| Kirkeberggata 31 AS | Real estate | 2025 |
| Kirknes-Wien Invest AS | Real estate | 2016 |
| Kiropraktor Trond Skar AS | Health & social care | 2011 |
| Kixz AS | Information & communication | 2022 |
| Kjell Langeteig Industriservice | Manufacturing | 2013 |
| Kjetil Egset Holding AS | | 2026 |
| Kjetil Kjærnes Holding AS | | 2022 |
| Kjonerud Teknologisenter Ans | Real estate | 1989 |
| Kjørum Holding AS | Professional & scientific | 2016 |
| Kjøs Invest AS | | 2002 |
| Kllr Invest AS | | 2022 |
| Klosser Innovasjon AS | Professional & scientific | 2000 |
| KLR Holding AS | Financial services | 2017 |
| Klubbeskolten AS | | 2023 |
| Kmkf AS | Wholesale & retail | 2017 |
| KN Musikk Hamar AS | Wholesale & retail | 1998 |
| Kneggen Hest Og Hundeutstyr Ans | Wholesale & retail | 1986 |
| Kni AS | Financial services | 2009 |
| Knut Johansen AS | Professional & scientific | 2021 |
| Knut Media AS | Arts & recreation | 2022 |
| Knut S Lervik Holding AS | | 2026 |
| Knut Sveen Consult AS | Professional & scientific | 2017 |
| Knutstad & Holen AS | Manufacturing | 2017 |