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| Move-It AS | Drammen | 2022 |
| Movemaster AS | Oslo | 2008 |
| Mowi Feed AS | Bergen | 2013 |
| MP Maskinservice Og Transport AS | Drammen | 2020 |
| MP Storkjøkkenservice AS | Ålesund | 2026 |
| MP Sveis & Service AS | Løvenstad | 2017 |
| MPC CZ Limited | Oslo | 2006 |
| MPH Holding AS | Kongsberg | 2005 |
| Mpo Id AS | Ulsteinvik | 2005 |
| MPT Service Nuf | Lier | 2014 |
| Mptek AS | Flatåsen | 2023 |
| MR Kapital AS | Larvik | 2012 |
| MR Service AS | Frolands Verk | 2019 |
| MR. Iceman AS | Oppaker | 2005 |
| MR. S AS | Sandnes | 2012 |
| MRS AS | Stavanger | 1987 |
| MRS Investering AS | Stavanger | 2005 |
| MRS Miccio AS | Laksevåg | 2025 |
| MRT System AB | Se-371 47 Karlskrona | 2017 |
| MS Dr.Skogsholm AS | Tønsberg | 2021 |
| Mse Filterpressen GmbH | De-75196 Remchingen | 2026 |
| Mse Krakow Spolka Z Ograniczona Odpowiedzialnoscia Nuf | 32-002 Kokotow | 2025 |
| Mse Multifunctional Survival Equipment AS | Gamle Fredrikstad | 2020 |
| MSH Utvikling AS | Halden | 2005 |
| MSJ Equity AS | Oslo | 2013 |
| MSP AS | Leksvik | 2022 |
| MSS Ship AS | Brattvåg | 2023 |
| MT Engineering AS | Søgne | 1988 |
| MT Industriservice AS | Sokna | 2021 |
| MT Mek AS | Sørreisa | 2024 |
| MT Multiservice AS | Omastrand | 2024 |
| MTC Og Partnere | Dk-5330 Munkebo | 2012 |
| MTH Svetsservice I Østhammar AB | Se-742 34 Østhammar | 2002 |
| MTK Hardanger AS | Odda | 2011 |
| MTR Invest AS | Oslo | 2017 |
| MTS Holding AS | Oslo | 2013 |
| MTS Industri AS | Leksvik | 2013 |
| MTS Tavler & Automasjon AS | Heimdal | 2022 |
| Mtu Maintenance Berlin Brandenburg GmbH Nuf | 14974 Ludwigsfelde | 2005 |
| Muehlhan Hvdc AS | Farsund | 2025 |
| Muehlhan Polska Spolka Z O.O. | 71-012 Szczecin | 2012 |
| Mugio Audio AS | Rådal | 2024 |
| Mugås Sag Og Maskin AS | Evanger | 2003 |
| Mukasa Coffee AS | His | 2017 |
| Mukti Tribe AS | Snarøya | 2026 |
| Mulag Fahrzeugwerk Heinz Wössner GmbH U Co KG | De-77728 Oppenau | 2019 |
| Mulleberg Holding AS | Skollenborg | 2022 |
| Multi Element AS | Oslo | 1991 |
| Multi Industrier AS | Oslo | 2002 |
| Multi Pulse Sweep International AS | Bergen | 1996 |
| Multi Reklame AS | Laksevåg | 1988 |
| Multi Vedlikehold Drift AS | Aksdal | 2007 |
| Multi-Metall AS | Stokke | 2020 |
| Multiax AS | Os | 2021 |
| Multicat Marine AS | Valevåg | 2020 |
| Multicell Ans | Trondheim | 1989 |
| Multiguard Electronic AS | Sellebakk | 2026 |
| Multiguard Produksjon AS | Sellebakk | 2026 |
| Multikon AS | Hamnvik | 1983 |
| Multimekanisk Kran & Truckservice AS | Førde I Hordaland | 2023 |
| Multiplast AS | Ski | 1997 |
| Multiprint AS | Hobøl | 2024 |
| Multiprint Da | Hobøl | 2022 |
| Multisveis Åmodt Reiersen Da | Sveio | 1999 |
| Multisveis AS | Oslo | 2009 |
| Multitech Holding AS | Fjell | 2015 |
| Multitech Quality & Service AS | Ågotnes | 2015 |
| Multitech Surface Treatment AS | Ågotnes | 2018 |
| Multivac Sepp Haggenmüller SE & Co. KG | De-87787 Wolfertschwend | 2023 |
| Muma Munch Bakst & Selskap | Oslo | 2019 |
| Munck Cranes AS | Kokstad | 2001 |
| Munckgrab AS | Laksevåg | 1995 |
| Munckgrab Services AS | Laksevåg | 2014 |
| Mundal Subsea Eiendom AS | Sæbøvågen | 2008 |
| Mundi Technology BV | Oslo | 2012 |
| Munin Coffeeroasters AS | Mo I Rana | 2017 |
| MUNK1 AS | Drammen | 2012 |
| Munkvoll Mekanisk Verksted AS | Trondheim | 1996 |
| Munsj AS | Gjerdrum | 2020 |
| Muorra AS | Kautokeino | 2022 |
| Museumshåndverkerne SA | Oslo | 1996 |
| Mustad AS | Oslo | 1986 |
| Mustad Autoline AS | Gjøvik | 2004 |
| Mustad Industrier AS | Oslo | 2018 |
| Mustad Industrier Holding AS | Oslo | 2020 |
| Mustad Industrier Kapital AS | Oslo | 2020 |
| Mustad Sealine AS | Gjøvik | 2017 |
| Mut Advanced Heating GmbH | De-07749 Jena | 2020 |
| Mvmek AS | Myre | 2023 |
| MVP AS | Sande I Vestfold | 1987 |
| Mw-Maskinering AS | Rakkestad | 2008 |
| Mxi Corp Nuf | Narvik | 2010 |
| My Bakery AS | Skjetten | 2004 |
| My Drty Wknd AS | Oslo | 2022 |
| My Goodness Norge AS | Oslo | 2025 |
| MY1OFNORWAY AS | Kristiansand S | 2017 |
| Mycloop AS | Laksevåg | 2026 |
| Myco Group AS | Nittedal | 2025 |
| Mydland Eiendom AS | Tromsø | 1981 |