| Munkegata Eiendom Vi AS | Real estate | 2011 |
| Munkegata Eiendom Vii AS | Real estate | 2011 |
| Munkegata Eiendom Viii AS | Real estate | 2011 |
| Munkegata Eiendom X AS | Real estate | 2012 |
| Munkegaten 39/41 AS | Real estate | 1996 |
| Munkegaten 9 AS | Real estate | 2017 |
| Munkegt. 25 AS | Real estate | 1962 |
| Munkholmen Eiendom AS | Real estate | 2015 |
| Munkholmen Eiendom II AS | Real estate | 2015 |
| Munkvoldaunet Gård AS | Real estate | 2023 |
| Munkvoll Gård AS | Real estate | 2010 |
| Munkvoll Mekanisk Verksted AS | Manufacturing | 1996 |
| Munkvollstien AS | Real estate | 2019 |
| Munkvollvegen 67 AS | Real estate | 2025 |
| Munkvollveien 76 AS | Real estate | 1988 |
| Munro AS | Wholesale & retail | 2015 |
| Munti Magic AS | Information & communication | 2017 |
| Murder Maids Da | Information & communication | 2021 |
| Murdron AS | | 2022 |
| Murmester Arne Kammen AS | Construction | 2005 |
| Murmester Arve Strøm AS | Construction | 2016 |
| Murmester Aune & Hammerås AS | Construction | 2019 |
| Murmester Erlend Knudtsen AS | Construction | 2021 |
| Murmester Gisle Aastum AS | Construction | 2011 |
| Murmestrene Kammen & Sneve AS | Construction | 1999 |
| Murvold Invest AS | | 2026 |
| Museene I Sør-Trøndelag AS | Arts & recreation | 2008 |
| Museums Restaurantene AS | Hospitality | 2015 |
| Museumsforlaget AS | Information & communication | 2013 |
| Museumsplass AS | Real estate | 2017 |
| Mustasj AS | Information & communication | 2018 |
| Musto AS | Arts & recreation | 2019 |
| Musum Interiør AS | Wholesale & retail | 1987 |
| Muttok AS | | 2012 |
| Muvs AS | Information & communication | 2008 |
| Mvi Holding AS | | 2020 |
| MVK Capital AS | Financial services | 2013 |
| MVR Invest AS | | 2026 |
| MVS Og Rodin AS | Real estate | 2018 |
| MX3 Holding AS | | 2024 |
| My Beauty & Health AS | Other services | 2022 |
| Myh Nutrition AS | Wholesale & retail | 2013 |
| Mykre AS | Health & social care | 2019 |
| Mylder Eiendom AS | Professional & scientific | 2002 |
| Myra Nærsenter AS | Real estate | 2020 |
| Myren Eign AS | | 2024 |
| Myrmo Invest AS | Arts & recreation | 2020 |
| Myrseth AS | Professional & scientific | 1990 |
| Myrseth Management Consulting AS | Information & communication | 2018 |
| Myrsnipa Holding AS | Financial services | 2010 |
| Myrtun Håndtverk AS | Administrative & support | 2007 |
| Myrveien 6 AS | Real estate | 2016 |
| Myrvik Holding AS | | 2021 |
| Mythic AS | Wholesale & retail | 2026 |
| Myworkout AS | Information & communication | 2013 |
| Murmester Ivar S. Moe A/S | Construction | 1988 |
| Måltidskultur AS | Professional & scientific | 2016 |
| Måløy Brygge AS | Real estate | 1996 |
| Måsøy Holding AS | | 2019 |
| Mæhre Holding AS | | 2025 |
| Mælen Blikk Og Ventilasjon AS | Construction | 2017 |
| Mælen Blikk Og Ventilasjon Holding AS | | 2010 |
| Mælen Ventilasjon Lynx Kitchen AS | Construction | 2024 |
| Mæp Holding AS | | 2025 |
| Mære Invest AS | | 2025 |
| Mæro Holding AS | | 2025 |
| Møbelringen Trondheim AS | Wholesale & retail | 2025 |
| Møbeltapetseringen AS | Manufacturing | 2020 |
| Møbinn Interiørkonsulent AS | Professional & scientific | 2018 |
| Møkkelgård Investment AS | Professional & scientific | 2020 |
| Mølback Invest AS | Financial services | 2016 |
| Møllehaugen 3 AS | Real estate | 2007 |
| Møllenberg Dagligvare AS | Wholesale & retail | 2016 |
| Møllenberg Legesenter Da | Health & social care | 1988 |
| Møller Bil Trøndelag AS | Wholesale & retail | 1983 |
| Møller Gullsmedforretning AS | Wholesale & retail | 1931 |
| Mølnå Bygg AS | Construction | 2025 |
| Mølnå Bygg Og Utleie AS | Real estate | 2018 |
| Mønness Invest AS | Financial services | 2005 |
| Mønsås AS | Real estate | 2015 |
| Mørch Web AS | Information & communication | 2025 |
| Møre Eiendom AS | Real estate | 2023 |
| Møre Eiendomsutleie AS | Real estate | 2024 |
| Møsth Holding AS | Financial services | 2014 |
| N&P Sandbox AS | | 2023 |
| N. a. Eie AS | Manufacturing | 2023 |
| N. Dyrhaug Invest AS | Professional & scientific | 2018 |
| N.Bakkan Holding AS | Financial services | 2015 |
| N.K.S. Kvamsgrind AS | Health & social care | 2007 |
| N.W.C AS | Wholesale & retail | 2006 |
| N1FOOD AS | Wholesale & retail | 2022 |
| Naas Elektro AS | Construction | 2020 |
| Nabla Technologies AS | | 2021 |
| Nabo Eiendom AS | Real estate | 1997 |
| Naboen Utleie Trondheim AS | Administrative & support | 2017 |
| Nabofrisøren AS | Other services | 2022 |
| Nadeno Nanoscience AS | Professional & scientific | 2022 |
| Naika AS | Health & social care | 2026 |
| Naits Invest AS | Real estate | 2015 |
| Namaste Norge Trondheim AS | Hospitality | 2022 |