| Morrison Montering AS | Ørsta | 2024 |
| Morrowstarx AS | Harestua | 2023 |
| Morstøl Bygger AS | Nesttun | 2019 |
| Morten Aamodtbygg AS | Nærbø | 2021 |
| Morten Bergerud-Karlsen AS | Sarpsborg | 2005 |
| Morten Bjørnstad Maling Og Byggtapetsering AS | Løten | 2012 |
| Morten Bruvold AS | Harestua | 2012 |
| Morten Engebretsen Holding AS | Hønefoss | 2014 |
| Morten Fixit AS | Rakkestad | 2016 |
| Morten Fossen AS | Prestfoss | 1998 |
| Morten Fredrikstad AS | Brandbu | 2008 |
| Morten Gultvedt Entreprenør AS | Ås | 1993 |
| Morten H. Jørgensen | Dk-6980 Tim | 2018 |
| Morten Halhjem Bygg AS | Os | 2016 |
| Morten Killi AS | Harstad | 2020 |
| Morten Korsnes AS | Trondheim | 2005 |
| Morten Kval AS | Lillehammer | 1998 |
| Morten Linstad Mur Og Flis AS | Gran | 2015 |
| Morten Maskin AS | Moss | 2014 |
| Morten Melkeraaen Fjellsprenging AS | Odda | 2015 |
| Morten Nyberg Graving Og Transport AS | Eidsvoll | 2012 |
| Morten Nybrot AS | Hagavik | 2006 |
| Morten Oliversen AS | Sarpsborg | 2008 |
| Morten Rør AS | Egersund | 2010 |
| Morten Skancke AS | Furnes | 2000 |
| Morten Solberg Invest AS | Hagan | 2005 |
| Morten Strand Anleggsservice AS | Vikersund | 2022 |
| Morten Strand Holding AS | Fredrikstad | 2008 |
| Morten Tømrer AS | Brumunddal | 2005 |
| Mortens Kranservice AS | Brumunddal | 2022 |
| Mortens Murte Ovner Ans | Vøyenenga | 2002 |
| Mortens Rør Og Vedlikehold AS | Lørenskog | 2018 |
| Mortens Rørinspeksjon AS | Kodal | 1996 |
| Mortensen Eiendom AS | Myre | 2017 |
| Mortensen Elektro & Automasjon AS | Lonevåg | 2019 |
| Mortensen Hus & Vedlikehold AS | Førresfjorden | 2025 |
| Mortensen Maskin Og Transport AS | Ballangen | 2021 |
| Mortensen Spyleservice AS | Ankenes | 2025 |
| Mortensville AS | Skiptvet | 2008 |
| Morterud & Ramse AS | Fetsund | 1992 |
| Mortund AS | Vinstra | 2007 |
| Morud & Heimlund AS | Maura | 2012 |
| Morvik Montasje AS | Laksevåg | 2026 |
| Morvik Sætre Gavlen Alarm Ans | Bergen | 1993 |
| Mos Servis D.O.O | Si-3241 Podplat | 2011 |
| Mosand Blikkenslagersmie AS | Klæbu | 2023 |
| Mosbygg AS | Mosvik | 2012 |
| Mosconi Norge AS | Hønefoss | 2017 |
| Mosconi S.R.L. Nuf | 25048 Edolo (Bs) | 2019 |
| Mosebø AS | Nesbru | 2018 |
| Mosjøen Bygg AS | Mosjøen | 2004 |
| Mosjøen Malerservice AS | Mosjøen | 2002 |
| Mosjøen Rørleggerservice AS | Mosjøen | 2024 |
| Moskenes VVS AS | Sørvågen | 2020 |
| Moskus Drift AS | Ridabu | 2023 |
| Moskus Elektro AS | Lesja | 2016 |
| Moss Bad & VVS Senter AS | Moss | 2005 |
| Moss Bad Og Varme AS | Moss | 2022 |
| Moss Betong & Stål AS | Rygge | 2026 |
| Moss Blikkenslagerverksted AS | Moss | 2019 |
| Moss Boligservice AS | Rygge | 2021 |
| Moss Bygg AS | Moss | 1997 |
| Moss Elektro AS | Moss | 1987 |
| Moss Elektroinstallasjon AS | Råde | 2013 |
| Moss Entreprenør AS | Råde | 2015 |
| Moss Flis & Betong AS | Rygge | 2010 |
| Moss Fliseservice AS | Dilling | 2015 |
| Moss Glass Og Fasade AS | Moss | 2004 |
| Moss Hage Og Vedlikehold AS | Son | 2025 |
| Moss Kjøleservice AS | Moss | 2022 |
| Moss Kobber & Blikk AS | Moss | 2012 |
| Moss Kulde & Varmeteknikk AS | Rygge | 2007 |
| Moss Multi AS | Horten | 2024 |
| Moss Rørlegger AS | Moss | 2024 |
| Moss Rørleggerservice AS | Moss | 1996 |
| Moss VVS AS | Moss | 2015 |
| Mossberg AS | Molde | 1989 |
| Mossia Ans | Lysaker | 2019 |
| Moster Elektro AS | Mosterhamn | 2007 |
| Moster Maskin AS | Mosterhamn | 2018 |
| Moster Rør AS | Mosterhamn | 2009 |
| Mostue AS | Siggerud | 2014 |
| Mosvangen Bygg AS | Stavanger | 2018 |
| Mosvold Drift AS | Kristiansand S | 1993 |
| Mosø Bygg Da | Oslo | 2001 |
| Motala Mättjänst AB | 591 61 Motala | 2011 |
| Motass Entreprenør AS | Tvedestrand | 2013 |
| Motopiknik AS | Skedsmokorset | 2022 |
| Motor Og Industriservice AS | Narvik | 2024 |
| Motorfist Norway AS | Talvik | 2011 |
| Mototek AS | Hobøl | 2020 |
| Motum AS | Oslo | 2017 |
| Moum Agri AS | Snåsa | 2026 |
| Mountain Loghome Oü | Ee-75501 Saku Harjumaa | 2004 |
| Mountainbay Solution AS | Tjodalyng | 2013 |
| Mourik-Services B.V. | Groot-Ammers 2964Aj | 2015 |
| Mova Byggplan AS | Vollen | 2013 |
| Move IT Maskin AS | Sortland | 2017 |
| Move Maskin AS | Saltstraumen | 2018 |
| Moveien 9 AS | Solbergelva | 2017 |