| Krofu Eiendom AS | Real estate | 2011 |
| Krofu Utleie AS | Real estate | 2020 |
| Krogh Dagligvare AS | Wholesale & retail | 2026 |
| Krogstads Veg AS | Real estate | 2015 |
| Kvalitetssikring Midt-Norge No AS | Professional & scientific | 2003 |
| Kvernrød AS | Real estate | 2005 |
| Kvernrød Eiendom AS | Real estate | 1998 |
| Kvislabakken Holding AS | Real estate | 1986 |
| KWP Holding AS | | 2008 |
| L-A Invest AS | | 2026 |
| L. Veglo Holding AS | | 2023 |
| La Donna AS | Other services | 1995 |
| La Roca Eiendom AS | Real estate | 2022 |
| Ladefjell AS | Construction | 2025 |
| Langstein Havn AS | Real estate | 2009 |
| Langøra Kaffe AS | Manufacturing | 2023 |
| Laugtug AS | Real estate | 2021 |
| Laugtug Eiendom AS | Real estate | 2021 |
| Laugtug Invest AS | Real estate | 2021 |
| Laugtug Solutions AS | | 2022 |
| Leif Anders Invest AS | Financial services | 2012 |
| Leif Hastadklev AS | Wholesale & retail | 2021 |
| Leif Henry Invest AS | | 2022 |
| Lenas Bunad AS | Manufacturing | 2021 |
| Leovil Eiendom AS | Real estate | 2018 |
| Leuthen-Klinikken AS | Health & social care | 2015 |
| Lev Vel Eiendom AS | Real estate | 2004 |
| Levanger Brygge AS | Real estate | 2015 |
| Levanger Brygge Eiendom AS | Real estate | 2005 |
| Levanger Fjordhotell Eiendom AS | Real estate | 2005 |
| Lh-Transport Ans | Transport & logistics | 1989 |
| Lian - Eiendom AS | Other services | 2008 |
| Liavatnet Fiskelag SA | Arts & recreation | 2002 |
| Ligaard Eiendom AS | Real estate | 2019 |
| Ligaard Holding AS | Wholesale & retail | 2018 |
| Lillelunden Gårdskjøkken AS | Hospitality | 2017 |
| Limain Holding AS | | 2024 |
| Lisa Og Tiril AS | Professional & scientific | 2026 |
| Lisbeth Myrvold Holding AS | Transport & logistics | 2017 |
| Listo Invest AS | | 2021 |
| Litoma AS | | 2023 |
| Llobarro Holding AS | | 2023 |
| Lo Utvikling AS | Real estate | 2005 |
| Loh-Invest AS | | 2022 |
| LRS Investering AS | | 2025 |
| Lsvs Holding AS | | 2026 |
| LTK Holding AS | Real estate | 2005 |
| Lucars Invest AS | | 2024 |
| Lucas-Invest AS | | 2026 |
| Lusoria AS | | 2025 |
| Lykkelig Bolig AS | Construction | 2023 |
| Lyngvær Bil Og Eiendom AS | Wholesale & retail | 2023 |
| Lås Og Montørservice AS | Wholesale & retail | 2019 |
| M.Veglo Holding AS | | 2023 |
| M3 Invest AS | Real estate | 2007 |
| Maiken Vennatrø Holding AS | Real estate | 2009 |
| Malermester Tero AS | Construction | 2025 |
| Malinfrisør AS | Other services | 2022 |
| Malt Musikk AS | Arts & recreation | 2015 |
| Mamima Invest AS | | 2017 |
| Marius Kristoffersen Holding AS | Real estate | 2018 |
| Marte Cecilie Holding AS | Real estate | 2005 |
| Marthes Holding AS | Other services | 2005 |
| Marthes Renseri AS | Other services | 1991 |
| Martin Løvli Holding AS | | 2021 |
| Martin Moesgate 10 AS | Real estate | 2000 |
| Maskin Reparasjon Stjørdal AS | Manufacturing | 2018 |
| Maskinutleie Stjørdal AS | Administrative & support | 2011 |
| Maskk Holding AS | | 2017 |
| Maskon AS | Manufacturing | 2022 |
| Mattemagi AS | Education | 2026 |
| Maxitaxi Midt-Norge AS | Transport & logistics | 2021 |
| MB Holding AS | Manufacturing | 2005 |
| MBK AS | Administrative & support | 2026 |
| MC Verksted Stjørdal AS | Other services | 2023 |
| MC Værnes Eiendom AS | Real estate | 1989 |
| Medbroen Drift AS | Agriculture & fishing | 2020 |
| Medbroen Gårdsbarnehage AS | Education | 2020 |
| Medbroen Holding AS | Education | 2020 |
| Mellomvegen AS | Real estate | 2013 |
| Menarmo AS | Other services | 2017 |
| Merlin Kids Stjørdal AS | Wholesale & retail | 2004 |
| Merratind Holding AS | | 2026 |
| Mertz Eiendom AS | Real estate | 2009 |
| Meråker Camping AS | Hospitality | 2020 |
| Mesi Invest AS | Financial services | 2015 |
| Metalldetektorbrødrene Da | Wholesale & retail | 2020 |
| Mew AS | Transport & logistics | 2022 |
| Mg-Auto AS | Wholesale & retail | 2014 |
| Mia Solheim AS | | 2026 |
| Midconsult AS | Professional & scientific | 2007 |
| Midt Norsk Avisdrift AS | Information & communication | 1993 |
| Midt-Norsk Gjensidig Brannkasse | Financial services | 1838 |
| Midt-Norsk Hytte AS | Real estate | 2019 |
| Midt-Norsk Rør AS | Wholesale & retail | 2012 |
| Midt-Norsk Transport AS | Transport & logistics | 1987 |
| Midtnorge Mynthandel AS | Wholesale & retail | 2024 |
| Mimo Varmepumpeservice AS | Construction | 2022 |
| Mindblown AS | Health & social care | 2020 |
| Mintage Fabrikk Trondheim AS | Hospitality | 2019 |