| Midroc Rodoverken AB | Se-444 21 Stenungsund | 1995 |
| Midroc Rodoverken Production SP. Z.O.O. | Pl-86-140 Drzycim | 2016 |
| Midsummer AS | Stavanger | 2016 |
| Midsund Bruk AS | Midsund | 2015 |
| Midsund Industriservice AS | Midsund | 2020 |
| Midt Norge Dental AS | Mosjøen | 1997 |
| Midt Norsk Betong Mosjøen AS | Mosjøen | 2012 |
| Midt Norsk Eiendom AS | Mosjøen | 2011 |
| Midt-Norge Slakteri AS | Levanger | 1994 |
| Midt-Norsk FÔR SA | Oppdal | 1960 |
| Midtgard Data Ans | Sparbu | 2001 |
| Midthaug Eiendom AS | Kleive | 1961 |
| Midthaug Holding AS | Kleive | 2022 |
| Midthaug Zink AS | Hjelset | 2011 |
| Midtnorsk Mobilslakt AS | Nordli | 1995 |
| Midtnorsk Trebåtverksted AS | Inderøy | 2012 |
| Migatronic Automation | Dk-9440 Åbybro | 2018 |
| Mikal Holding AS | Kleppestø | 2005 |
| Mikals Laks AS | Skiftun | 2000 |
| Mikalsen Bakeri & Konditori AS | Trondheim | 2002 |
| Mikalsen Bakeri Produksjon AS | Trondheim | 2010 |
| Mikalsen Og Hansens Mobile Sagbruk Da | Drangedal | 1994 |
| Mike's Hydraulik & Motor | 7730 Hanstholm | 2016 |
| Mikels Kaffebrenneri Holding AS | Skedsmokorset | 2024 |
| Mikkelsplass Ski Og Skigard AS | Nesbyen | 2012 |
| Mikro Partner AS | Grimstad | 2017 |
| Mikrobageriet AS | Arendal | 2016 |
| Mikrobageriet Grenstøl AS | Tvedestrand | 2025 |
| Mikrobageriet Krøgenes AS | Arendal | 2026 |
| Mikroenergi AS | Rognes | 1999 |
| Mikromeyer Bryggerhus AS | Spydeberg | 2014 |
| Mikrourt Innlandet AS | Moelv | 2023 |
| Mila Noire AS | Moss | 2025 |
| Milestads Lift & Tilhengerservice AS | Gullaug | 2021 |
| Miljöprotector AS | Sandnes | 2024 |
| Miljø- Og Fluidteknikk AS | Østerås | 1992 |
| Miljøbetong AS | Sandnes | 2015 |
| Miljøbriketter AS | Skien | 2021 |
| Miljøbølgen AS | Langesund | 2007 |
| Miljøenergi AS | Vanse | 2015 |
| Miljøfôr Norge AS | Ingeberg | 1993 |
| Miljøhytta AS | Skodje | 2022 |
| Miljøplast AS | Vear | 1991 |
| Miljøpreservering AS | Stavanger | 2023 |
| Miljøstein Norge AS | Våle | 2013 |
| Milla Osa AS | Vestnes | 2022 |
| Millba AS | Skien | 1999 |
| Milles Bunadstue AS | Kristiansand S | 2026 |
| Mills AS | Oslo | 2016 |
| Mima Skeppa Och Industriservice AB | Sarpsborg | 2003 |
| Mimirflow AS | Kongsberg | 2020 |
| Min Traad AS | Oslo | 2019 |
| Minde Snekkeri AS | Bergen | 1983 |
| Mindu Sweden AB Nuf | Se-771 35 Ludvika | 2021 |
| Minera AS | Årnes | 1992 |
| Minera Skifer AS | Drivdalen | 1998 |
| Mingarwalker Glassblåseri AS | Nærbø | 2006 |
| Minges Universal Service AS | Trøgstad | 2015 |
| Minibakeriet AS | Nordfjordeid | 2015 |
| Miniflens AS | Vatne | 1986 |
| Minihus Innlandet AS | Lillehammer | 2023 |
| Minitech AS | Ridabu | 2017 |
| Minkopi.No AS | Grålum | 2002 |
| Minus Nuf | 7430 Ikast | 2010 |
| Mio Gelato AS | Larvik | 2024 |
| Mir&Pak AS | Langhus | 2018 |
| Mira Moda AS | Jessheim | 2021 |
| Miraflores Holding AS | Stavern | 2005 |
| Mirage Coating AS | Sandnes | 2023 |
| Miras Group AS | Mo I Rana | 2012 |
| Miras Hydraulikk AS | Mo I Rana | 2017 |
| Miras Solutions AS | Mo I Rana | 1989 |
| Miretu Rør & Sveis AS | Horten | 2025 |
| Miro Montasje AS | Tustna | 2021 |
| Misvær Sag Da | Misvær | 2009 |
| Mit Holding AS | Jonsvatnet | 2018 |
| Mitoboosting Supplements AS | Øystese | 2019 |
| Mitsubishi Turbocharger and Engine Europe BV Nuf | Spikkestad | 2014 |
| Mittet AS | Eidsnes | 1990 |
| Mittkompass AS | Gullaug | 2024 |
| Mivanor AS | Sandnes | 2014 |
| MJ Gruppen AS | Myre | 2021 |
| MJ Maskinservice AS | Myre | 2016 |
| Mj-Marine AS | Kristiansand S | 2017 |
| Mj-Marine Mor AS | Kristiansand S | 2018 |
| Mjelde Sveis Og Montasje AS | Filtvet | 2006 |
| MJM Holding AS | Bardufoss | 2015 |
| MJT Montage | Se-375 33 Mörrum | 2022 |
| Mjåland Mekanisk AS | Iveland | 2024 |
| Mjåtveitflaten 31 AS | Kokstad | 1962 |
| Mjøderiet AS | Ytre Arna | 2016 |
| Mjølhus Maskin AS | Nedre Vats | 2026 |
| Mjømna 1591 AS | Byrknesøy | 2019 |
| Mjørud AS | Rakkestad | 1998 |
| Mjørud Gruppen AS | Rakkestad | 1987 |
| Mjøs Metallvarefabrikk AS | Lonevåg | 1982 |
| Mjøsa Betong AS | Kongsvinger | 2010 |
| Mjøsa Båtservice AS | Brumunddal | 2017 |
| Mjøsa Naturstein Ans | Hamar | 2001 |
| Mjøsbetong AS | Ottestad | 2013 |