| Maskin & Service AS | Notodden | 2019 |
| Maskin & Transportservice Da | Rossfjordstraumen | 2025 |
| Maskin & Utleie AS | Steinsholt | 2026 |
| Maskin & Veidrift AS | Hokksund | 2022 |
| Maskin Entreprenør Roger Nærum AS | Skien | 2006 |
| Maskin Entreprenøren AS | Kleppestø | 2024 |
| Maskin I Nord AS | Harstad | 2017 |
| Maskin Og Anlegg AS | Finnsnes | 1979 |
| Maskin Og Grunnarbeid AS | Flatåsen | 2008 |
| Maskin Og Hage AS | Bjorbekk | 2018 |
| Maskin Og Transport AS | Karasjok | 2005 |
| Maskin Og Vedlikehold AS | Farsund | 2014 |
| Maskin- Og Snøservice AS | Tromsø | 2023 |
| Maskin-Team AS | Ålgård | 2007 |
| Maskinanlegg AS | Brumunddal | 2019 |
| Maskinbygg AS | Oslo | 2009 |
| Maskineier Tommy Kristoffersen AS | Tomasjord | 2012 |
| Maskinentrepenør Bekkelien & Hagelund Ans | Fall | 1992 |
| Maskinentrepenør Christian Eriksen AS | Holmestrand | 2015 |
| Maskinentrepenør Innlandet AS | Brumunddal | 2019 |
| Maskinentreprenør Arild Viken AS | Førde | 1994 |
| Maskinentreprenør Bjarte Lund AS | Kaupanger | 2025 |
| Maskinentreprenør Christer Jakobsen AS | Mosjøen | 2017 |
| Maskinentreprenør Egil Åstad AS | Bøn | 1984 |
| Maskinentreprenør Eikeland AS | Steinsholt | 2023 |
| Maskinentreprenør Espen Johansen AS | Silsand | 2025 |
| Maskinentreprenør Fundamentering Og Graving AS | Tromsø | 2026 |
| Maskinentreprenør Helling AS | Oslo | 2023 |
| Maskinentreprenør Herbjørn Nilssen AS | Tromsø | 1998 |
| Maskinentreprenør Håkon Rogstad AS | Mesnali | 2012 |
| Maskinentreprenør Ingar Løver AS | Steinsholt | 2017 |
| Maskinentreprenør Ivar H Eikeberg AS | Duken | 1997 |
| Maskinentreprenør J Bjørntvedt AS | Strømmen | 2022 |
| Maskinentreprenør Jarle Johansen AS | Tromsø | 2020 |
| Maskinentreprenør Jimmy Nore & Sønn AS | Måløy | 2002 |
| Maskinentreprenør Jostein Sunde AS | Skei I Jølster | 2023 |
| Maskinentreprenør Karsten Mikalsen AS | Engelsviken | 2011 |
| Maskinentreprenør Kim Olsen AS | Greåker | 2019 |
| Maskinentreprenør Knut Rolandsen AS | Røst | 2002 |
| Maskinentreprenør Kristian Kristiansen AS | Narvik | 2000 |
| Maskinentreprenør Kurt Sandnes AS | Hansnes | 2006 |
| Maskinentreprenør Kvilekval AS | Kragerø | 2009 |
| Maskinentreprenør Magnus Kjøsnes AS | Vassenden | 2023 |
| Maskinentreprenør Magnus Knudsen AS | Sannidal | 2022 |
| Maskinentreprenør Monan AS | Kristiansand S | 2019 |
| Maskinentreprenør O.G. Røyland AS | Flekkerøy | 2008 |
| Maskinentreprenør R. Tobiassen AS | Rakkestad | 2025 |
| Maskinentreprenør Steffen Berge AS | Eikelandsosen | 2021 |
| Maskinentreprenør Stian a. Olsen AS | Nannestad | 2017 |
| Maskinentreprenør Stig Kristiansen AS | Tromsø | 1987 |
| Maskinentreprenør Storhei AS | Hægeland | 2018 |
| Maskinentreprenør Svend Fjellstad AS | Ytre Enebakk | 1998 |
| Maskinentreprenør Sølve Bogen AS | Vestfossen | 2025 |
| Maskinentreprenør Tas AS | Andebu | 2005 |
| Maskinentreprenør Tor Gabrielsen AS | Kvaløya | 2000 |
| Maskinentreprenør Tormod Severinsen AS | Lakselvbukt | 2013 |
| Maskinentreprenør Trygve Aasen AS | Førde | 2022 |
| Maskinentreprenøren Arnstein Revheim AS | Lonevåg | 1993 |
| Maskinentreprenøren Sør AS | Lillesand | 2006 |
| Maskingartneren Andersen AS | Skreia | 2023 |
| Maskingutta AS | Ramnes | 2022 |
| Maskinhandel AS | Søgne | 2019 |
| Maskinholder Oddvar Andreassen AS | Stokmarknes | 2020 |
| Maskinholder Teigen AS | Skjåk | 2006 |
| Maskinkameratan AS | Ankenes | 2026 |
| Maskinkontakt AS | Ytre Arna | 1986 |
| Maskinkraft AS | Moelv | 1997 |
| Maskinoppdrag AS | Vik I Sogn | 2023 |
| Maskinpartner AS | Lillehammer | 2017 |
| Maskinproffen AS | Sortland | 2020 |
| Maskinsentralen AS | Leinesfjord | 1999 |
| Maskinservice AS | Fosnavåg | 2021 |
| Maskinteknikk Bergen AS | Blomsterdalen | 2018 |
| Masope AS | Storebø | 2018 |
| Masosa Holding AS | Porsgrunn | 2010 |
| Maspero Elevatori Spa | It-22070 Appiano Gentile (Co) | 2013 |
| Masse Maling & Bygg AS | Oslo | 2024 |
| MASSIV3 AS | Oppegård | 2022 |
| Massiva Husfabrik | Ee-74207 Liivamäe Kula | 2023 |
| Massivbetong AS | Otta | 2025 |
| Mast Gulv AS | Sola | 2021 |
| Mast Montasje AS | Hell | 2020 |
| Mast- Och Tornunderhåll Sverige Aktiebolag Nuf | Oslo | 2017 |
| Mastad Maskin AS | Knarrlagsund | 1992 |
| Master Drilling Europe AB Nuf | Se-93131 Skellefteå | 2016 |
| Master Flis Og Bygg AS | Nesttun | 2023 |
| Master Hands AS | Slemmestad | 2018 |
| Master Industry | Lv-2150 Sigulda | 2023 |
| Master Malerservice AS | Kløfta | 1998 |
| Master Proff Bygg AS | Sandnes | 2022 |
| Master Sealing AS | Verdal | 2020 |
| Master Sealing Holding AS | Verdal | 2020 |
| Master Sealing Sør AS | Verdal | 2016 |
| Master Service AS | Sandvika | 2019 |
| Master Stillas AS | Verdal | 2013 |
| Master Teknikk Bygg AS | Olderdalen | 2017 |
| Master Teknikk Gruppen AS | Lakselvbukt | 2013 |
| Master-Service AS | Gjøvik | 2004 |
| Masterbad AS | Oslo | 2021 |
| Mastercladding Ltd Nuf | Northampton Nn2 8Sy | 2026 |