| Larsen Maskin Og Transport AS | Construction | 2019 |
| Lasergt AS | Manufacturing | 2025 |
| Lasses Bilverksted AS | Other services | 2010 |
| Lekva Consulting Limited Nuf | Administrative & support | 2024 |
| Lekva Invest | | 2024 |
| Lereggen Bygg AS | Construction | 2025 |
| Lereggen Rør AS | Construction | 2020 |
| Lervaag Holding AS | | 2023 |
| Lisbeth Berges Urtesalve AS | Wholesale & retail | 2024 |
| Lise Westergren AS | Professional & scientific | 2017 |
| Lisi B AS | Real estate | 2015 |
| Little House AS | Hospitality | 2023 |
| Live Gruppen AS | Professional & scientific | 2002 |
| LMT Eiendomsutvikling AS | Real estate | 2023 |
| LMT Holding AS | Construction | 2019 |
| Lorvik Eiendom AS | Real estate | 2001 |
| Lunaq AS | Real estate | 2025 |
| Lundamo Eiendom AS | Real estate | 2024 |
| Lundamovegen 476 AS | Real estate | 2022 |
| Lysklettøy AS | Administrative & support | 2022 |
| Løkkegata 1 AS | Real estate | 2017 |
| Løvset Barnehage SA | Education | 2004 |
| M.J. Michaelsen Norge AS | Wholesale & retail | 2020 |
| M4 Asset AS | | 2026 |
| Mabu Ved AS | Agriculture & fishing | 2023 |
| Macserien Norge AS | Wholesale & retail | 1987 |
| Maje AS | Financial services | 2018 |
| Malermester Løvseth AS | Construction | 2017 |
| Mamarosa Melhus AS | Hospitality | 2012 |
| Mancave Studio AS | Transport & logistics | 2024 |
| Maren Aarstad Holding AS | | 2024 |
| Marif AS | | 2025 |
| Marineteam AS | Wholesale & retail | 1972 |
| Martes Fotterapi AS | Health & social care | 2022 |
| Mathisen AS | Transport & logistics | 1997 |
| Matmegleren AS | Wholesale & retail | 1998 |
| Matpartner AS | Manufacturing | 2000 |
| Matpartner Eiendom AS | Real estate | 2015 |
| Maur Invest AS | Real estate | 2017 |
| Maycan AS | Professional & scientific | 2022 |
| Maysel Eiendom AS | Real estate | 2023 |
| Mb&E Holding AS | Construction | 2024 |
| Mb&E Prosjekter AS | Real estate | 2020 |
| Medalhus AS | Real estate | 2013 |
| Medalhus Holding AS | Financial services | 2008 |
| Melhus Aksjelag AS | Financial services | 2018 |
| Melhus Bilskadesenter AS | Other services | 2014 |
| Melhus Bilvask AS | Other services | 2024 |
| Melhus Blomsterhandel AS | Wholesale & retail | 1995 |
| Melhus Boliginvest AS | Real estate | 2017 |
| Melhus Bygg & Eiendom AS | Construction | 2017 |
| Melhus Dekk AS | Wholesale & retail | 2023 |
| Melhus Drosjesentral AS | Transport & logistics | 2012 |
| Melhus Dyreklinikk AS | Professional & scientific | 2012 |
| Melhus Eiendom AS | Real estate | 2017 |
| Melhus Entreprenør Da | Construction | 2024 |
| Melhus Fotterapi AS | Health & social care | 2022 |
| Melhus Fysioterapiklinikk AS | Real estate | 2014 |
| Melhus Helseartikler AS | Wholesale & retail | 1993 |
| Melhus Helsekost AS | Wholesale & retail | 2024 |
| Melhus Hesteklinikk AS | Professional & scientific | 2017 |
| Melhus Holding AS | | 2021 |
| Melhus Hår AS | Other services | 2017 |
| Melhus Hørsel AS | Health & social care | 2018 |
| Melhus Legesenter AS | Health & social care | 1999 |
| Melhus Minilager AS | Real estate | 2020 |
| Melhus Onstage AS | Education | 2016 |
| Melhus Pizza AS | Hospitality | 2018 |
| Melhus Pizzeria AS | Hospitality | 2012 |
| Melhus Regnskap AS | Professional & scientific | 1999 |
| Melhus Regnskapslag SA | Administrative & support | 1953 |
| Melhus Restaurant AS | Hospitality | 2017 |
| Melhus Skysstasjon AS | Real estate | 1990 |
| Melhus Snekkerservice AS | | 2021 |
| Melhus Sparebank | Financial services | 1840 |
| Melhus Sport AS | Wholesale & retail | 2021 |
| Melhus Steinindustri AS | | 2021 |
| Melhus Tech Hub AS | Professional & scientific | 2026 |
| Melhus Trafikkskole AS | Education | 1985 |
| Melhus Transportsentral Ans | Transport & logistics | 1990 |
| Melhus Treningsstudio Da | Arts & recreation | 1998 |
| Melhus Utleie Og Vaktmester AS | Administrative & support | 2018 |
| Melhus Utviklingsarena AS | Real estate | 2008 |
| Melhus Ventilasjon AS | Construction | 2024 |
| Melhus-Eiendomsutvikling AS | Real estate | 2025 |
| Melhus/Buvik Utmarkslag SA | Real estate | 1991 |
| Melhusvegen 720 AS | Real estate | 2010 |
| Mellingsæter AS | Manufacturing | 2004 |
| Melody Market AS | Arts & recreation | 2020 |
| Mesko AS | Professional & scientific | 2005 |
| Midt Legesenter AS | Health & social care | 2013 |
| Midt Miljøavfall AS | Water & waste | 2015 |
| MLW Holding AS | Construction | 2018 |
| Mo Grus AS | Mining & quarrying | 2014 |
| Monkmound AS | Wholesale & retail | 2015 |
| Monti AS | Construction | 2026 |
| Morten Aarstad Invest AS | Real estate | 2007 |
| Mosøya Eiendom AS | Real estate | 2021 |
| Motorhome AS | Administrative & support | 2003 |
| Motus Invest AS | Wholesale & retail | 2022 |