| Magdalena Holding AS | Søgne | 2005 |
| Magenta & Partner Oü | Ee-10151 Tallin | 2012 |
| Maghrebtravel Da | Oslo | 2004 |
| Magic River Travels AS | Tiller | 2018 |
| Magic Security AS | Bergen | 2017 |
| Magiske Indiareiser AS | Oslo | 2024 |
| Magma Geopark AS | Egersund | 2009 |
| Magnella Holding AS | Kvaløya | 2017 |
| Magnereiser AS | Oslo | 2021 |
| Magnet Executive Search AS | Stavanger | 2022 |
| Magnetic North Expeditions AS | Tromsø | 2026 |
| Magnetic North Travel Ltd Nuf | London Ec2M 7Py | 2016 |
| Magnetun Maskin AS | Gol | 2015 |
| Magnetun Vaktmestertjenester AS | Gol | 2026 |
| Magnit Global Denmark Aps | Høvik | 2008 |
| Magnolic AS | Larvik | 2026 |
| Magnus Berg Utleie AS | Skotselv | 2024 |
| Magu Group AS | Førresfjorden | 2026 |
| Magway Ren&Bygg AS | Ski | 2021 |
| Maho Holding AS | Skien | 2010 |
| Maid for Cleaning AS | Oslo | 2015 |
| Maid in Norway AS | Oslo | 2023 |
| Mainby | Ch-1205 Genéve | 2021 |
| Mainfactor Inc | 19147, Philadelphia, Pennsylvania | 2024 |
| Maingate Aps | Dk-7000 Fredericia | 2017 |
| Mainstreamz AS | Oslo | 2012 |
| Maison 88 AS | Nesodden | 2026 |
| Majk Com Cieciura Krzysztof | 87-050 Solec Kujawski | 2012 |
| Majki Marlena Sochanowska | 61-531 Poznan | 2008 |
| Major Recruitment Ltd | Cleckheaton Bd19 3Tt | 2011 |
| Majorservice AS | Oslo | 2020 |
| Majorstua Renholdservice AS | Oslo | 2015 |
| Majorstuen Rens Og Renhold AS | Oslo | 2009 |
| Mak Partners AS | Bjørnemyr | 2021 |
| Makino Milling Machine Co. Ltd | Jp-152-8578 Tokyo | 2017 |
| Maks Underholdning AS | Sandnes | 2025 |
| Malaki AS | Smøla | 2019 |
| Malama Earthventures GmbH Nuf | Ch-8003 Zürich | 2025 |
| Malangen Ansnes Adventures AS | Mortenhals | 2024 |
| Malangen Brøyting AS | Mortenhals | 2020 |
| Malax AS | Rong | 2011 |
| Maldene Invest AS | Hidrasund | 2019 |
| Maldon Hydrographic Ltd | Essex Cm9 5De | 2010 |
| Malelu Holding AS | Oslo | 2019 |
| Maler Og Byggtjenester AS | Fåberg | 2018 |
| Malerbua Utleie AS | Hafrsfjord | 1994 |
| Malermester Lars Bo Asmussen | Oslo | 2013 |
| Malervikarene Ans | Gjerdrum | 2004 |
| Maleta Utleie AS | Tomasjord | 2020 |
| MALING & STILLAS ANS Kolbjørn og Karstein Arentzen | Fjellhamar | 1984 |
| Malinor AS | Hønefoss | 2025 |
| Mall Drift AS | Holum | 2018 |
| Malling & Co Eiendomsdrift AS | Oslo | 2000 |
| Mallorcatour.No AS | Bjørkelangen | 2016 |
| Mallorcatur.No AS | Tromsdalen | 2012 |
| Malmø Kongress AB | 21125 Malmö | 2019 |
| Malspray.No AS | Maura | 2024 |
| Malus Eiendom AS | Mo I Rana | 2014 |
| Malvik Bygdeservice SA | Hommelvik | 1995 |
| Malvin Consulting AS | Ålesund | 2020 |
| Malz Invest AS | Bygland | 2002 |
| Mama Afrika Travel AS | Vegårshei | 2024 |
| Mama Holdco AS | Sandnes | 2019 |
| Mamano Invest AS | Kragerø Skjærgård | 2020 |
| Mambofish Technology Solutions Limited | Gb-Se14 5Sb London | 2019 |
| Mamma AS | Rådal | 2017 |
| Mammali Holding | Dk-2500 København | 2023 |
| Man in Van AS | Oslo | 2025 |
| Management 4 U AS | Stavanger | 2015 |
| Management Events Norway AS | Fornebu | 2010 |
| Management for Hire Norge AS | Nesøya | 2013 |
| Management Training Systems Ans | Bergen | 1990 |
| Manaheim AS | Kongsberg | 2023 |
| Manchester City FC Limited | Manchester M11 3Ff | 2012 |
| Mandal Utleie AS | Mandal | 2019 |
| Mandal Vakt Og Redning AS | Mandal | 2001 |
| Mane Contract Services Limited | Sandnes | 2012 |
| Manhua International AS | Bergen | 2022 |
| Mani AS | Haugesund | 2010 |
| Manic Media Ans | Bergen | 1995 |
| Manitowoc Crane Group Ltd | Buckingham Mk18 4Fd | 2013 |
| Mankan Da | Oslo | 1989 |
| Manki AS | Oslo | 2025 |
| Mannai AS | Midsund | 2025 |
| Mannes Vask Og Rens AS | Sævelandsvik | 2009 |
| Manngard Vakt & Sikkerhet AS | Trysil | 2013 |
| Mannskap AS | Oslo | 2018 |
| Mannsverk Maskin AS | Tverrelvdalen | 2017 |
| Manor House Nuf | Lt-51229 Kaunas | 2023 |
| Manpower AS | Oslo | 1965 |
| Manpower Framnæs Installasjon AS | Sandefjord | 1975 |
| Manpower Industri AS | Oslo | 2019 |
| Manpower Staffing Services AS | Oslo | 2000 |
| Manpower UK Limited | Sandefjord | 2006 |
| Manpowergroup AS | Oslo | 2003 |
| Manpowergroup Netherlands B.V. | 1112Xn Diemen, Noord-Holland | 2025 |
| Manpro AS | Lakselv | 2011 |
| Manta Utleie AS | Tjodalyng | 2013 |
| Manup Consultancy Pte Ltd | Sg-Singapore 188216 | 2020 |
| Mar De Gaviria (Nuf) Nuf | Es-03580 L'Alfas Del Pi Alicante | 2024 |