| Høy Puls Holding AS | Wholesale & retail | 2005 |
| Idea AS | Professional & scientific | 1998 |
| Ideloftet Da | Wholesale & retail | 1989 |
| Ilmio AS | Wholesale & retail | 2023 |
| Imha AS | Health & social care | 2026 |
| Imha Holding AS | | 2026 |
| Impelis AS | | 2025 |
| Industrien AS | Manufacturing | 2017 |
| Industrivegen 2 Stjørdal AS | Real estate | 2019 |
| Industrivegen 6 Stjørdal AS | Real estate | 2019 |
| Industriveien 3 AS | Real estate | 2004 |
| Ingeniørfirma Laugtug AS | Professional & scientific | 2019 |
| Inger Lise Solheim AS | | 2026 |
| Innherredsvegen 57B AS | Real estate | 2025 |
| Innherredsveien 57 AS | Real estate | 2019 |
| Innovx Holding AS | Information & communication | 2024 |
| Intakt Bilskade Stjørdal AS | Other services | 2013 |
| Intellectus AS | Professional & scientific | 2020 |
| Interregnum AS | Arts & recreation | 2021 |
| Investering I Bedre Helse AS | Health & social care | 2008 |
| Isak D Westgaard AS | Water & waste | 1981 |
| Ivma AS | Financial services | 2016 |
| Ivr Holding AS | | 2019 |
| Ivrig Eiendom AS | Real estate | 2016 |
| J E Gulbrandsen AS | Transport & logistics | 2021 |
| J Engzelius & Søn AS | Real estate | 1937 |
| J Havdal AS | Professional & scientific | 2020 |
| Ja Eiendom AS | Real estate | 2015 |
| Jade Capital AS | | 2026 |
| Jan Håvard Invest AS | Financial services | 2012 |
| Jan Sakshaug Sport AS | Wholesale & retail | 2004 |
| Janro Holding AS | | 2013 |
| Jasper AS | Financial services | 2017 |
| JBR Invest AS | Financial services | 2014 |
| Jelm Holding AS | | 2025 |
| Jernbanevegen 4 AS | Real estate | 2023 |
| JF - Holding AS | | 2005 |
| Jkjr Holding AS | Financial services | 2016 |
| JNS Stjørdal AS | Real estate | 2011 |
| Joda Consult & Invest AS | | 2022 |
| Jof Holding AS | Wholesale & retail | 2024 |
| Joker Engros AS | Wholesale & retail | 2008 |
| Jordbærpikene Stjørdal AS | Hospitality | 2008 |
| JP Eqty AS | | 2024 |
| Jul På Trøndersk Da | Arts & recreation | 2025 |
| Julseth Klausen Holding AS | Wholesale & retail | 2005 |
| K-A Tyvold Invest AS | | 2020 |
| K2U Invest AS | Real estate | 2005 |
| Kaie Holding AS | | 2020 |
| Kaitre AS | Information & communication | 2018 |
| Kalseth Wahl Holding AS | | 2019 |
| Kam Eiendom AS | Real estate | 2013 |
| Kansas AS | Wholesale & retail | 1998 |
| Karma Indisk Restaurant AS | Hospitality | 2025 |
| Karstens Frisørteam AS | Other services | 2005 |
| Kaso Holding AS | Financial services | 2017 |
| Kavle Eiendom AS | Real estate | 2005 |
| Kazal Frisørsalong AS | Other services | 2020 |
| KB KB Holding AS | | 2024 |
| Kenn-Ole Moen AS | Professional & scientific | 1995 |
| KG Utbygging AS | Real estate | 2019 |
| Khaki AS | Professional & scientific | 2025 |
| Kilnesgården Ans | Real estate | 1991 |
| Kilnesgården Stjørdal AS | Real estate | 1994 |
| Kirkeveien 24 AS | Real estate | 2007 |
| Kirkeveien 3 AS | Real estate | 1995 |
| Kirkeveien 4 Ans | Real estate | 2000 |
| Kirkeveien 7 AS | Real estate | 2023 |
| KIRO1 Stjørdal AS | Health & social care | 2009 |
| Kiropets AS | Professional & scientific | 2016 |
| Kiropraktor Sigrid Nyvik AS | Health & social care | 2009 |
| Kjeldsen & Svingen Ans | Professional & scientific | 1999 |
| Kjetil Skåtterød AS | | 2012 |
| Kjøpmannsgata 2 AS | Real estate | 2023 |
| Kjøpmannsgata 27 AS | Real estate | 2011 |
| Kjøpmannsgata 28 AS | Real estate | 2015 |
| Kjøpmannsgata 28 Hjemmel Ans | Real estate | 2006 |
| Kjøpmannsgata 3 AS | Real estate | 2010 |
| Kjøpmannsgata 30 Hjemmel Ans | Real estate | 2006 |
| Kjøpmannsgata 34 Hjemmel Ans | Real estate | 2006 |
| Kjøpmannsgata 37 AS | Real estate | 2016 |
| Kjøpmannsgata 4 AS | Real estate | 2015 |
| Kjøpmannsgata 43 AS | Real estate | 2006 |
| Kjøpmannsgata 8 AS | Real estate | 2020 |
| Kjøpmannsgata Eiendom AS | Real estate | 2013 |
| Kjøpmannsgata Mote AS | Wholesale & retail | 2012 |
| Kjøpmannsgaten 39 AS | Real estate | 1983 |
| Kleven Johansen AS | | 2010 |
| Kleven-Lilleklev-Myrtrøa Veglag | Real estate | 1995 |
| Knurit`N AS | Professional & scientific | 2025 |
| Knut Lisø Holding AS | Real estate | 2013 |
| Kongens GT 19 AS | Real estate | 1987 |
| Kopperå Holding AS | | 2017 |
| KR. Moen Holding AS | | 2025 |
| Kran & Utstyrskontroll AS | Wholesale & retail | 2024 |
| Kringen AS | Financial services | 2017 |
| Kringen Rør AS | Construction | 2006 |
| Kristoffersen Bil AS | Wholesale & retail | 1997 |
| Kristoffersen Bil Bilutleie AS | Administrative & support | 1997 |
| Krofu AS | Real estate | 2004 |