| Montørklubb Adecco Bergen | Other services | 2012 |
| Mood Studio Bergen AS | Other services | 2025 |
| Moonshine Solutions AS | Professional & scientific | 2013 |
| Moore Bergen AS | Professional & scientific | 2014 |
| Moore Bergen Holding AS | Real estate | 2013 |
| Moreller AS | Wholesale & retail | 2024 |
| Morgendagens Eiendom AS | Real estate | 2023 |
| Morgendagens Media AS | Professional & scientific | 2020 |
| Morkei AS | | 2022 |
| Morken Invest AS | | 2023 |
| Morland Barbers AS | Other services | 2021 |
| Moro-Invest AS | Professional & scientific | 2005 |
| Morten Foss Holding AS | Manufacturing | 2012 |
| Mortstor AS | Financial services | 2016 |
| Morula AS | Real estate | 2014 |
| Morvik Sætre Gavlen Alarm Ans | Construction | 1993 |
| Morvikgrenda SA | Real estate | 1988 |
| Mosaia AS | Wholesale & retail | 2026 |
| Mosaiq AS | Professional & scientific | 2018 |
| Mosaker Rekruttering AS | Administrative & support | 2016 |
| Moseheia Invest AS | | 2026 |
| Moseidsletta 122 Eiendom AS | Real estate | 2011 |
| Mosel AS | Information & communication | 2026 |
| Mossin Holding AS | Professional & scientific | 2005 |
| Motbør AS | | 2018 |
| Motex Engineering Limited Nuf | Professional & scientific | 2004 |
| Mothership Entertainment AS | Information & communication | 2019 |
| Mothership Group AS | Information & communication | 2023 |
| Moti AS | Information & communication | 2018 |
| Motivati AS | Information & communication | 2013 |
| Motorhallen AS | Real estate | 2007 |
| Motstroem Media AS | Professional & scientific | 2021 |
| Mott Macdonald Ireland Limited Nuf | Professional & scientific | 2012 |
| Mou Marine Advisory AS | Professional & scientific | 2026 |
| Move Holding AS | | 2013 |
| Move Your Association AS | Administrative & support | 2014 |
| Moveexo AS | Information & communication | 2022 |
| Mowatt Holding AS | | 2024 |
| Mowi ASA | Agriculture & fishing | 1992 |
| Mowi Feed AS | Manufacturing | 2013 |
| Mowi Genetics AS | Professional & scientific | 2018 |
| Mowi Holding AS | Agriculture & fishing | 1996 |
| Mowi Invest AS | | 2004 |
| Mowi Markets Norway AS | Agriculture & fishing | 2015 |
| Mowi Minority Holding AS | Agriculture & fishing | 2005 |
| Mowi Norway Fou AS | Professional & scientific | 2017 |
| Mowi Seawater Norway AS | Agriculture & fishing | 2018 |
| Mowin AS | Professional & scientific | 2006 |
| Mowinckel Holding AS | Real estate | 1967 |
| Mowinckel Invest AS | Real estate | 1998 |
| Mowinckel Management AS | Real estate | 2005 |
| Mowinckel Shipping AS | Transport & logistics | 1993 |
| Moyka Music AS | Information & communication | 2025 |
| MR Creosote & Friends AS | Hospitality | 2017 |
| MR. Chan AS | Hospitality | 2024 |
| MR. Damascy AS | Hospitality | 2020 |
| MS Marine AS | Financial services | 2017 |
| MSD Animal Health Innovation AS | Professional & scientific | 1985 |
| MSD Animal Health Norge AS | Wholesale & retail | 1997 |
| MSF Holding AS | Financial services | 2016 |
| Msi Holding AS | Wholesale & retail | 2021 |
| Mskj Holding AS | | 2020 |
| MSR Invest Naturlig Terapi AS | Real estate | 2013 |
| Mssg AS | Information & communication | 2026 |
| MT Investment AS | Real estate | 2019 |
| MTB Capital AS | Real estate | 2008 |
| MTB Eiendomsutvikling AS | Real estate | 1999 |
| MTG Holding AS | Real estate | 2004 |
| MTH Invest AS | Real estate | 2023 |
| MTM Bolig AS | Construction | 2025 |
| MTM Corp. AS | Hospitality | 2015 |
| MTS Shipping AS | | 2024 |
| Mttas Holding AS | Construction | 2022 |
| Mttas Invest AS | Real estate | 2022 |
| Muffin Og Hekkel Restaurantdrift Ans | Hospitality | 2008 |
| Muh Holding AS | | 2021 |
| Mulen Eiendom 1 AS | Real estate | 2024 |
| Mulen Holding AS | Professional & scientific | 2022 |
| Mulen Nær-Mat AS | Wholesale & retail | 2015 |
| Multi Pulse Sweep International AS | Manufacturing | 1996 |
| Multifiks Maling AS | Construction | 2025 |
| Multiform Bergen AS | Professional & scientific | 2019 |
| Mum's Noodle AS | Hospitality | 2024 |
| Munch AS | Professional & scientific | 2018 |
| Munco AS | Professional & scientific | 2013 |
| Mundal Invest AS | | 2019 |
| Muninn AS | Information & communication | 2026 |
| Munther Kunst AS | Arts & recreation | 2021 |
| Muoidejohka Kraft AS | Energy | 2010 |
| Muralmenningen AS | Real estate | 2023 |
| Muren Eiendom AS | Real estate | 1986 |
| Murhjørnet AS | Real estate | 2013 |
| Murmester Terje Dyngeland AS | Construction | 2000 |
| Murmester Tor Trygve Pedersen AS | Construction | 2015 |
| Murmester Tor Trygve Pedersen Holding AS | Construction | 1993 |
| Murmester Tormod Grahl-Madsen AS | Construction | 2010 |
| Musicality AS | Arts & recreation | 2026 |
| Musicdna AS | Information & communication | 2007 |
| Musikk-Miljø A/S | Wholesale & retail | 1987 |
| Musikkhuset.No AS | Wholesale & retail | 2021 |