| M3 Transport AS | Ålesund | 2013 |
| M3CARGO AS | Lakselv | 2019 |
| Ma Taxi AS | Lysaker | 2024 |
| Ma Transport AS | Fjellhamar | 2021 |
| Maad Transport AS | Kløfta | 2017 |
| Maan Sjøfart AS | Andenes | 1992 |
| Maaseide Transport Og Kran AS | Ålesund | 2025 |
| Mac Anthony Dystrybusjon AS | Stavanger | 2021 |
| Mac Capital AS | Råde | 2024 |
| Macont AS | Ågotnes | 2025 |
| Macro Offshore Crew DK Aps | Dk-1256 Københanvn K | 2025 |
| Macro Trading AS | Masfjordnes | 1980 |
| Madina Drosje Og Transport AS | Haugesund | 2024 |
| Madland Transport AS | Brusand | 2019 |
| Madrid Express Limited | Oslo | 2022 |
| Madsen Transport AS | Hommersåk | 2024 |
| Maersk | 1098 Copenhagen K | 2014 |
| Maersk Air Nuf | 2791 Dragør | 1999 |
| Maersk Logistics & Services Norway AS | Halden | 1991 |
| Maersk Norge AS | Lysaker | 1987 |
| Maersk Supply Service Canada Ltd | Newfoundland A1C 1K4 | 2011 |
| Maestro Transport AS | Sandefjord | 2011 |
| Mag Larsen Service Aps | 5853 Ørbæk | 2016 |
| Magellan Global BV (Dryffus) | 6604Lr Wijchen | 2026 |
| Magenta Investments Limited | Bs-Nsw 2027 Edgecliff | 2025 |
| Magnar Solvang Transport Og Betongpumping AS | Nordkjosbotn | 2020 |
| Magnar Sulen Transport AS | Godvik | 2004 |
| Magne Davidsen Transport AS | Mathopen | 1998 |
| Magne Gundersen Kran Og Transport AS | Halden | 2013 |
| Magne Hagen Taxi AS | Hov | 2024 |
| Magne Klungtveit Transport AS | Nedstrand | 1996 |
| Magne Rosvold Transport AS | Trondheim | 1998 |
| Magnerud AS | Mogreina | 2025 |
| Magnesen Transport AS | Morvik | 2005 |
| Magnus Gaustad Tramsport AS | Alversund | 2023 |
| Magnus Haugsdal Transportforretning AS | Knarrevik | 2025 |
| Magnus Nistad AS | Sande I Sunnfjord | 1978 |
| Magnus O Og Wenche K Kristiansen Ans | Stavanger | 2004 |
| Magnus Reiser AS | Stathelle | 2001 |
| Magnus Wik Transport AS | Ulefoss | 2025 |
| Magnussen Transport & Logistikk AS | Arendal | 2013 |
| Magnussen Transporttjenester AS | Rennebu | 2023 |
| Maha Transport AS | Oslo | 2013 |
| Maia Eiendom AS | Lillehammer | 1989 |
| Maia Vinstra AS | Vinstra | 2017 |
| Maif 2 Norway AS | Asker | 2017 |
| Maif 2 Petrochem Norway AS | Asker | 2017 |
| Maihaugen Garasjelag SA | Skien | 1995 |
| Majabe AS | Oslo | 2025 |
| Majoren Flyttebyrå Oslo AS | Oslo | 2016 |
| Makan Transport AS | Brumunddal | 2025 |
| Makar AS | Oslo | 2023 |
| Making Place AS | Lillestrøm | 2023 |
| Maksi Distribusjon AS | Sola | 1997 |
| Maler Bygg Og Transport AS | Slattum | 2022 |
| Malik Ali AS | Lier | 2025 |
| Malik Group Holding AS | Oslo | 2019 |
| Malik Taxi AS | Trondheim | 2017 |
| Malix Invest AS | Porsgrunn | 2024 |
| Malix Transport AS | Porsgrunn | 2024 |
| Malmin Maskinutleie AS | Hommersåk | 2007 |
| Malmin Transport AS | Hommersåk | 2007 |
| Malmingruppen AS | Hommersåk | 1998 |
| Mamma Holding AS | Oslo | 2022 |
| Mammoet (UK) Ltd | Gb-Wallsend Ne28 6Sg | 2018 |
| Mammoet Denmark Brande | Dk-7330 Brande | 2014 |
| Mammoet Europe B.V. | 3115Jd Schiedam | 2014 |
| Mammoet Global Assets B.V. | 3528Ae Utrecht | 2022 |
| Mammoet Nederland B.V. | 3115Jd Sciedam | 2021 |
| Mammoet Offshore Services Ltd | Staffordshire St18 0Pe | 2002 |
| Mamod Invest AS | Rødberg | 2002 |
| Mamuka Irina Nikolaishvili AS | Kristiansand S | 2024 |
| Mancave Studio AS | Melhus | 2024 |
| Mandal Parkering AS | Mandal | 2003 |
| Mandelbrot Media AS | Kragerø | 2012 |
| Manglerud Betong AS | Oslo | 2006 |
| Manis Transport AS | Figgjo | 2025 |
| Mann&Bil AS | Stavanger | 2024 |
| Mantra Event Limited Nuf | Drøbak | 2011 |
| Manuka Honey (Europe) Limited | Ie-Dublin D02R296 Dublin 2 | 2025 |
| Mar De Gedrez SL Nuf | Es-38002 Santa Cruz De Tenerife | 2018 |
| Mar De Godos SL Nuf | Es-38002 Santa Cruz De Tenerife | 2018 |
| Mar De Grullos SL Nuf | Es-38002 Santa Cruz De Tenerife | 2018 |
| Maram Taxi AS | Råholt | 2026 |
| Maran Amundsen AS | Stavanger | 2026 |
| Maran Aurora AS | Stavanger | 2026 |
| Maran Current AS | Stavanger | 2026 |
| Maran Lambada AS | Stavanger | 2026 |
| Maran Nansen AS | Stavanger | 2026 |
| Maran Peary AS | Stavanger | 2026 |
| Maran Rainbow AS | Stavanger | 2026 |
| Maran Scott AS | Stavanger | 2026 |
| Maran Shuttle Tankers Norway AS | Stavanger | 1992 |
| Maran Tide AS | Stavanger | 2026 |
| Maran Wave AS | Stavanger | 2026 |
| Maran Wind AS | Stavanger | 2026 |
| Maras AS | Namsos | 2012 |
| Marb Holding AS | Inderøy | 2022 |
| Marceliussen Transport AS | Hordvik | 2011 |
| Marco Polo Travel AS | Oslo | 2003 |