| HT Utleie AS | Real estate | 2017 |
| Huggu Buver AS | | 2022 |
| Hundeverket AS | Education | 2026 |
| Husa Maskin AS | Construction | 2021 |
| Husby Anlegg AS | Construction | 2026 |
| Immune AS | Wholesale & retail | 2020 |
| Imont AS | Other services | 2022 |
| Inbalance Livsstil AS | Health & social care | 2022 |
| Industriveien 65 Holding AS | Real estate | 2005 |
| Ivers Holding AS | Other services | 2022 |
| J J Eiendom AS | Real estate | 2004 |
| J S Holding AS | Health & social care | 2005 |
| Jam Invest AS | | 2020 |
| JBD Invest 2 AS | | 2026 |
| JBD Invest AS | | 2025 |
| JF Eiendom AS | Real estate | 2011 |
| Jomag AS | Real estate | 2006 |
| Jonettaplassen Gårdsbarnehage AS | Education | 2011 |
| Josa Bygg AS | Construction | 2017 |
| JS Ålberg AS | Administrative & support | 2024 |
| JSN Invest AS | Professional & scientific | 2013 |
| Ju Tech AS | Information & communication | 2023 |
| Kenneth Eggan AS | Construction | 2013 |
| Kjemitek AS | Wholesale & retail | 2023 |
| Klæbu Bakeri AS | Manufacturing | 2012 |
| Klæbu Barnehage AS | Education | 2019 |
| Klæbu Bil & Bensin Eftf AS | Wholesale & retail | 2022 |
| Klæbu Bioenergi AS | Energy | 2014 |
| Klæbu Eiendom AS | Information & communication | 2010 |
| Klæbu Frisør AS | Other services | 2019 |
| Klæbu Golf & Padel AS | Arts & recreation | 2025 |
| Klæbu Golfsenter AS | Arts & recreation | 2002 |
| Klæbu Grunneierlag SA | Real estate | 2012 |
| Klæbu Holding AS | Wholesale & retail | 2020 |
| Klæbu Il Drift AS | Arts & recreation | 2012 |
| Klæbu Inneklima AS | Construction | 2017 |
| Klæbu Invest AS | Real estate | 2022 |
| Klæbu Kontor Og Minilager AS | Real estate | 2022 |
| Klæbu Legesenter AS | Health & social care | 2008 |
| Klæbu Treningssenter AS | Arts & recreation | 2013 |
| Klæbugruppen AS | | 2026 |
| Klæbuposten AS | Information & communication | 2007 |
| Klæbutak AS | Construction | 2012 |
| KMT Holding AS | | 2023 |
| Knærten Fus Friluftsbarnehage AS | Education | 2021 |
| Kraftr -Kraft Og Beredskap AS | Professional & scientific | 2026 |
| Krimar AS | Construction | 2005 |
| Krimar Eiendom AS | Construction | 2013 |
| Ks-Zoo AS | Wholesale & retail | 2015 |
| Kuldabygg AS | Construction | 2019 |
| Kvalitetsbygg Trondheim AS | Construction | 2025 |
| Lambine Holding AS | Financial services | 2014 |
| Lamoyco AS | Wholesale & retail | 2021 |
| Langelandvegen 7 AS | Real estate | 2023 |
| Liabø Transport AS | Transport & logistics | 1995 |
| Lian Bygg & Eiendomsservice AS | Real estate | 2016 |
| Liang Invest AS | Health & social care | 2008 |
| Lien Bilskade AS | Wholesale & retail | 2002 |
| Lihkku Holding AS | Financial services | 2017 |
| Lillinvest AS | Real estate | 2016 |
| Lucas Holding AS | Construction | 2017 |
| Lumity AS | Information & communication | 2025 |
| Lundlia Utbyggingsselskap AS | Real estate | 2019 |
| Luno HPJ AS | | 2018 |
| M.Mortensen AS | Manufacturing | 2013 |
| Mada Holding AS | | 2026 |
| Maref AS | | 2025 |
| Maritim-Elektro AS | Construction | 2018 |
| Marius Moe Holding AS | | 2026 |
| Marjo Holding AS | Real estate | 2016 |
| Mesterlandskap Holding AS | Administrative & support | 2023 |
| Mevano Transport AS | Transport & logistics | 2023 |
| MGG Holding AS | Construction | 2021 |
| Mhbd Invest AS | | 2026 |
| Midt-Norsk Mur AS | Construction | 2024 |
| Milano Klæbu Restaurant AS | Hospitality | 2014 |
| Mltt Holding AS | | 2026 |
| Moadalen Eiendom AS | Real estate | 2018 |
| Moe Maskin & Betong AS | Construction | 2026 |
| Moirer AS | Wholesale & retail | 2025 |
| Mosand Blikkenslagersmie AS | Construction | 2023 |
| Multi Trade Auto AS | Wholesale & retail | 2024 |
| Multi-Holding AS | | 2025 |
| Musikk Holding AS | Wholesale & retail | 2005 |
| Mvbil AS | Wholesale & retail | 2005 |
| Myrbakken AS | Professional & scientific | 1992 |
| Mytaxi Nord AS | Transport & logistics | 2018 |
| Målsjøen Samdrift Da | Agriculture & fishing | 2003 |
| Nidaros Drift AS | Administrative & support | 2026 |
| Nidaros Lys Og Blomster AS | Wholesale & retail | 2002 |
| Nidaros Sparebank | Financial services | 1857 |
| Nidelven Tannhelse AS | Health & social care | 2019 |
| Nitro AS | Wholesale & retail | 2006 |
| Nitro-Bil AS | Other services | 2006 |
| Noah Eiendom AS | Real estate | 2017 |
| Nordal Park AS | Real estate | 2014 |
| Nordic Service AS | Administrative & support | 2005 |
| Nordmarka Beitelag SA | Agriculture & fishing | 1993 |
| Nordset Bygg AS | Real estate | 2008 |
| Nordset Gård Drift AS | Manufacturing | 2022 |