| Leboe AS | Information & communication | 2017 |
| Leinløkken AS | Real estate | 2005 |
| Leinstrand Grunneierlag SA | Real estate | 1952 |
| Lene Bergersen AS | Health & social care | 2026 |
| Lereggen Holding AS | | 2023 |
| Liba Eiendom AS | Real estate | 2010 |
| Lien Rørservice AS | Construction | 2020 |
| Lightyear AS | Professional & scientific | 2024 |
| Lillys Holding AS | | 2026 |
| Lindand Capital AS | | 2025 |
| Linsjo AS | Professional & scientific | 2023 |
| Linsjo Holding AS | Professional & scientific | 2023 |
| Lipek Malerservice AS | Construction | 2022 |
| Litchville AS | Real estate | 2005 |
| Lofotenview AS | Professional & scientific | 2018 |
| Lokes AS | Construction | 2023 |
| Lokra AS | Professional & scientific | 2025 |
| Lord Eiendom 1 AS | Real estate | 2026 |
| Lord Eiendom 2 AS | Real estate | 2026 |
| Lord Eiendom 3 AS | Real estate | 2026 |
| Lord Eiendom 4 AS | Real estate | 2026 |
| Lord Eiendom AS | Real estate | 2005 |
| Lord Eiendom Finans AS | Real estate | 2017 |
| Lord Eiendom Invest AS | Real estate | 2025 |
| Lord Property AS | Real estate | 2025 |
| Lund Maskin AS | Construction | 2001 |
| Lund Østre AS | Real estate | 2010 |
| Lundemobakken 5B AS | Real estate | 1999 |
| Lundåsen Barnehage AS | Education | 2005 |
| Løvik Holdingselskap AS | | 2024 |
| Løvsethaugen AS | Real estate | 2015 |
| Løvåstomta AS | Real estate | 2014 |
| M-L Eiendom 2 AS | Real estate | 2017 |
| M-L Eiendom AS | Real estate | 2017 |
| M. Eggan AS | Arts & recreation | 2015 |
| Madri Holding AS | | 2021 |
| Madsa Invest AS | | 2026 |
| Magnus Den Godes Gate 6 AS | Real estate | 2011 |
| Makaløs AS | Professional & scientific | 2023 |
| Make IT Snow AS | Real estate | 2015 |
| Malejo AS | Professional & scientific | 2017 |
| Malland AS | Construction | 2019 |
| Mamos AS | Professional & scientific | 2013 |
| Manuellterapi AS | Health & social care | 2016 |
| Marcus Thranes Veg 1 AS | Real estate | 2015 |
| Marius Bil AS | Wholesale & retail | 2023 |
| Marius Johansen AS | Wholesale & retail | 2025 |
| Marius Renovering AS | Construction | 2020 |
| Marsar AS | | 2020 |
| Marthes Bok AS | Arts & recreation | 2023 |
| Martin Johannessen Holding AS | | 2021 |
| Martinus Invest Limited Nuf | Real estate | 2011 |
| Marøy Østensen Holding AS | Health & social care | 2025 |
| Masala Hus AS | Hospitality | 2023 |
| Mat AS | Wholesale & retail | 2021 |
| MBK Holding AS | | 1987 |
| Mbne Holding AS | | 2017 |
| Me Consulting AS | Professional & scientific | 2022 |
| Megogminevikan Holding AS | | 2023 |
| Melhustorget 2 AS | Real estate | 2025 |
| Melhustorget AS | Real estate | 2017 |
| Mellifera Holding AS | | 2020 |
| Melvin Invest AS | | 2025 |
| Mesterkonsult AS | Professional & scientific | 2019 |
| Mestertak Trondheim AS | Construction | 2005 |
| Metallco Ee Trondheim AS | Water & waste | 2008 |
| Metallco Eiendom Trondheim AS | Real estate | 2023 |
| MF Invest AS | Real estate | 2014 |
| Mf-Consulting AS | Professional & scientific | 2018 |
| Mga Design AS | Professional & scientific | 2020 |
| MH Fremdrift AS | | 2025 |
| Midt-Norge Assuranse AS | Financial services | 2014 |
| Midt-Norge Maskinsenter AS | Wholesale & retail | 1985 |
| Midt-Norsk Hestesenter AS | Real estate | 2003 |
| Midt-Norsk Montasje AS | Professional & scientific | 2017 |
| Midt-Norsk Omsorg AS | Health & social care | 2012 |
| Mijo Invest AS | Real estate | 2016 |
| Miljø-Team AS | Administrative & support | 2001 |
| Minde Bygg AS | Real estate | 2005 |
| Minde Bygg Holding AS | Real estate | 2023 |
| Minor Industriplast AS | Construction | 2014 |
| Minstemann Holding AS | | 2019 |
| MMS Holding AS | Real estate | 2005 |
| MNC Detailing Studio AS | Other services | 2026 |
| Modum System Midt-Norge AS | Wholesale & retail | 2005 |
| Mojo Management AS | Real estate | 2020 |
| Moleaer AS | Wholesale & retail | 2022 |
| Mollan Invest AS | | 2019 |
| Momo Waldorfskole AS | Education | 2011 |
| Moro-Bygg AS | Construction | 2022 |
| Morten Nikolaisen Holding AS | | 2019 |
| Morten Sognli Holding AS | | 2026 |
| Morty's AS | Transport & logistics | 2024 |
| Moshagen AS | Real estate | 2016 |
| Mosp AS | | 2025 |
| Motueka AS | Real estate | 2024 |
| Movere Økonomi & Regnskap AS | Professional & scientific | 2013 |
| Mrai Holding AS | Wholesale & retail | 2024 |
| MTS Tavler & Automasjon AS | Manufacturing | 2022 |
| Multi Grunnmur AS | Construction | 1992 |