| Ko Bygg Og Interiør AS | Construction | 2018 |
| Kobe Holding AS | | 2021 |
| Kodeskalle AS | Information & communication | 2023 |
| Kontoret Trondhjem AS | Administrative & support | 2012 |
| KR Omsetning AS | Wholesale & retail | 2012 |
| Kricam Eiendom AS | Real estate | 2021 |
| Kricam Holding AS | Construction | 2018 |
| Kringen Holding AS | Financial services | 2014 |
| Kristins Maritim Design AS | Professional & scientific | 2009 |
| Kroisos AS | Real estate | 2005 |
| Krokan Holding AS | Financial services | 2005 |
| Kråkmoveien 27 AS | Real estate | 2022 |
| KTK AS | | 2023 |
| Kummermo Holding AS | Information & communication | 2019 |
| Kvalitek Dør & Vindu AS | Wholesale & retail | 2012 |
| Kvello Hansen Kompetanse AS | Information & communication | 2015 |
| Kvello-Hansen Ekspertise AS | Administrative & support | 2025 |
| Kvello-Hansen Holding AS | | 2025 |
| KVG Holding AS | Information & communication | 2015 |
| KWP Invest AS | | 2025 |
| L.Nordnes Holding AS | Construction | 2023 |
| Lagerseksjoner Trøndelag AS | Real estate | 2019 |
| Lassvebergv. 8 - 10 AS | Real estate | 2021 |
| Lavendel Blomster Og Interiør AS | Wholesale & retail | 2013 |
| Leading Dentists of the World AS | Education | 2024 |
| Leangen Aktivitetshus AS | Arts & recreation | 2022 |
| Leasperle Holding AS | Other services | 2023 |
| LEDER1 AS | Professional & scientific | 2014 |
| Lekeplassen Familiebarnehage AS | Education | 2022 |
| Lensman AS | Professional & scientific | 2020 |
| Lesund Service AS | Construction | 2019 |
| Letnes Holding AS | Information & communication | 2018 |
| Liamo Holding AS | | 2024 |
| Lie & Dahl Eiendom AS | Real estate | 2022 |
| Lie Agenturer AS | Wholesale & retail | 2018 |
| Life by Design AS | Education | 2026 |
| Lilleborg Eiendom AS | Real estate | 2026 |
| Linesøy Feriesenter AS | Real estate | 2006 |
| Linginvest AS | Administrative & support | 2019 |
| Lingtechapps AS | Information & communication | 2024 |
| Linnvi Holding AS | Real estate | 2021 |
| Lisbo AS | Financial services | 2005 |
| Livets Lyse Sider AS | Real estate | 2018 |
| LL International AS | Professional & scientific | 2016 |
| Lobelia Invest AS | Professional & scientific | 2006 |
| Locai Holding AS | | 2025 |
| Locationblocks Nuf | Information & communication | 2006 |
| Loft Eiendom AS | Real estate | 2015 |
| Loft Eiendom Oppdal AS | Real estate | 2018 |
| Lossiusveien 24 AS | Real estate | 2011 |
| Lube Records Ans | Information & communication | 2004 |
| Lukky AS | | 2024 |
| Luna Transport Nuf | Transport & logistics | 2021 |
| Lund Pyro AS | Administrative & support | 2016 |
| Lundåsen Invest AS | | 2021 |
| Luno AS | Financial services | 2005 |
| Lymy Invest AS | | 2023 |
| Lysingen AS | Professional & scientific | 2016 |
| Lysmen Invest AS | Financial services | 2014 |
| M E Invest AS | | 2005 |
| M Hammer AS | | 2020 |
| M Hustad Holding AS | | 2019 |
| M Hvidsten Holding AS | | 2025 |
| M. a. Invest AS | | 2005 |
| M. Ellingsen Holding AS | | 2026 |
| M. Schanke AS | | 2025 |
| Magnus Consulting AS | Professional & scientific | 2020 |
| Magsi AS | Construction | 2025 |
| Maler Singstad AS | Construction | 2026 |
| Malermester Berge AS | Construction | 2005 |
| Malermester Talseth & Husby AS | Construction | 1997 |
| Malermester Trondvold AS | Construction | 2026 |
| Malerservice AS | Construction | 2013 |
| Malino AS | Professional & scientific | 2009 |
| Malmar Holding AS | | 2025 |
| Mantinia AS | Real estate | 1990 |
| Mantinia Bolig AS | Real estate | 2018 |
| Mantinia Fritidsboliger AS | Real estate | 2016 |
| Mantinia Utvikling AS | Professional & scientific | 2008 |
| Marit Lauritzen Holding AS | Information & communication | 2021 |
| Maritimt Kompani AS | Manufacturing | 2009 |
| Markaplassen Barnehage SA | Education | 1992 |
| Maro Invest AS | Financial services | 2005 |
| Marte Stenvaag Holding AS | | 2021 |
| Mas Aqua AS | Real estate | 2021 |
| Mattson Holding AS | Administrative & support | 2007 |
| MCB Invest AS | Real estate | 2006 |
| Medicus Futura AS | | 2024 |
| Medvind Assistanse AS | Health & social care | 2019 |
| Medvind Assistanse Holding AS | Professional & scientific | 2017 |
| Medvind Independent Living AS | Other services | 2021 |
| Mee Holding AS | Professional & scientific | 2022 |
| Melo Holding AS | | 2025 |
| Metisnord AS | | 2026 |
| MH Consulting AS | Information & communication | 2022 |
| MH Næringseiendom AS | Real estate | 2010 |
| Midt-Norge Blåseisolering AS | Construction | 2021 |
| Mineralplan AS | Professional & scientific | 2016 |
| Minilager 1 Trondheim AS | Real estate | 2014 |
| MJ Prinsipal AS | Financial services | 2005 |