| In-Vino Veritas AS | Real estate | 2018 |
| Inam AS | Professional & scientific | 2003 |
| Inatur Norge AS | Arts & recreation | 2002 |
| Indiana AS | Other services | 2021 |
| Industrihallene Eiendom AS | Real estate | 2005 |
| Industrivarer AS | Wholesale & retail | 1995 |
| Industrivegen 6 AS | Real estate | 2025 |
| Industrivegen 7 AS | Real estate | 2025 |
| Industriveien 41 AS | Real estate | 2016 |
| Industriveien 43 AS | Real estate | 2016 |
| Industriveien 430 AS | Real estate | 2019 |
| Ingunns Villagalleria AS | Arts & recreation | 2022 |
| Inspira AS | Education | 2015 |
| Invest Gruppen AS | Real estate | 1994 |
| Irmis AS | Real estate | 2010 |
| Isal Invest AS | | 2018 |
| Isomax Energi AS | Construction | 2005 |
| Itmon AS | Information & communication | 2025 |
| Ive Holding AS | Real estate | 2022 |
| Iver Hatland AS | Construction | 2026 |
| J&S Eiendom AS | Real estate | 2003 |
| J. Wågan Invest AS | | 2018 |
| Jacobsen & Bentsen Produkter Ans | Manufacturing | 1990 |
| Jait Partner AS | Information & communication | 2008 |
| Jamea AS | Real estate | 2022 |
| Jaras Drift AS | Real estate | 2012 |
| Jaras Eiendom AS | Real estate | 2004 |
| Jaras Eiendom Steinkjer AS | Real estate | 1997 |
| Jaras Gas AS | Manufacturing | 2013 |
| Jaras Invest AS | Real estate | 2018 |
| Jaras Kapital AS | Real estate | 2005 |
| Jaras Nor AS | Financial services | 1996 |
| Jaras Utvikling AS | Manufacturing | 2013 |
| Jarasbet AS | Real estate | 2016 |
| Jarasgruppen AS | Administrative & support | 2012 |
| Jernbanegata 1 AS | Real estate | 2007 |
| Jh-Bygg AS | Construction | 2022 |
| JK Kjøren AS | Health & social care | 2017 |
| JK Kran AS | Transport & logistics | 2022 |
| Jksk Holding AS | Transport & logistics | 2024 |
| JM Helse AS | Health & social care | 2025 |
| Jmo Holding AS | Professional & scientific | 2021 |
| Jober Invest AS | Other services | 2023 |
| Johansen Holding AS | Real estate | 1998 |
| Jonassen Og Amundsen Bygg Da | Construction | 1993 |
| Jotal AS | Real estate | 2019 |
| JT Holding AS | Construction | 2016 |
| JTM Bygg AS | Construction | 2022 |
| Jubar Eiendom AS | Real estate | 1994 |
| Jujejo AS | Wholesale & retail | 2014 |
| Jutu AS | Financial services | 2005 |
| Jøa Live AS | Administrative & support | 2024 |
| K. Devik AS | Other services | 2022 |
| K. Skjærvik AS | Professional & scientific | 2022 |
| K. Thorsen Utleie AS | Administrative & support | 2022 |
| Kaifronten AS | Real estate | 2023 |
| Kapteingata Eiendom AS | Real estate | 2016 |
| Karako Eiendom AS | Real estate | 2015 |
| Kasi Invest Namsos AS | Hospitality | 2015 |
| Kass-Invest AS | | 2024 |
| Kathiravel AS | Real estate | 2023 |
| Kattmarka Vann Og Avløpslag SA | Water & waste | 2024 |
| Kine's Corner AS | Wholesale & retail | 2011 |
| Kirkegata 14 AS | Real estate | 2026 |
| Kirkegata 5A AS | Real estate | 2005 |
| Kirkegata 73 Levanger AS | Real estate | 2004 |
| Kiropraktorklinikken Namdal AS | Health & social care | 2007 |
| Kjeveortoped Geir Kristian Skistad AS | Health & social care | 2026 |
| Kjeveortoped Sandor Jancso AS | Health & social care | 2026 |
| Kjærlighetsstien 53 AS | Health & social care | 2022 |
| Kjølstad Flataas Holding AS | Construction | 2024 |
| Kjønnøy Holding AS | Construction | 2025 |
| Kl-Byggconsult AS | Professional & scientific | 2012 |
| Klippen Eiendom AS | Real estate | 2014 |
| Knubben AS | Real estate | 2019 |
| Kongensgate 10 AS | Real estate | 2001 |
| Kontorassistanse Ans | Administrative & support | 1989 |
| Kosmedic Hudklinikk AS | Other services | 2021 |
| Kostholdstreneren AS | Health & social care | 2025 |
| KPC Holding AS | | 2026 |
| Krijo Invest AS | Financial services | 2016 |
| Krokfrakt AS | Transport & logistics | 2024 |
| Kumudu Eiendom AS | Real estate | 2020 |
| Kvaale Samdrift Da | Agriculture & fishing | 2006 |
| Kveli Invest AS | | 2022 |
| Kveli Rånes Bremseth AS | Arts & recreation | 2017 |
| Kvigtind Invest AS | Wholesale & retail | 2021 |
| L Glømmen Holding AS | | 2024 |
| L Johansen AS | Wholesale & retail | 1986 |
| L&S Eiendom AS | Real estate | 2001 |
| Lager & Service Da | Real estate | 2008 |
| Lagereiendom AS | Real estate | 2020 |
| Lakkspesialisten Holding AS | Financial services | 2008 |
| Landscan AS | | 1984 |
| Langtangen Invest AS | Real estate | 2016 |
| Larsen Montasje Og Invest AS | Construction | 2023 |
| Lavika Eiendom AS | Real estate | 2020 |
| Laviken Dagligvare AS | Wholesale & retail | 2021 |
| Ledang Eiendom AS | Real estate | 2021 |
| Ledang Holding AS | Wholesale & retail | 2015 |