 | MAGNA PROSJEKT SØR AS | 823569262 | LINDESNES |
| MAGNAR BJØRNEVIK | 883520262 | TYSNES |
| MAGNAR INSTANES AS | 989995502 | ULLENSVANG |
| MAGNAR LUND MASKIN AS | 989986384 | FLEKKEFJORD |
| MAGNAR SKJÆVELAND MURMESTER | 970112243 | SANDNES |
| MAGNAR STOKKE AS | 914415888 | MELHUS |
| MAGNE DAG BRAGELIEN | 970956808 | SEL |
| MAGNE HAFSTAD AS | 974536935 | SUNNFJORD |
| MAGNE HELLAND AS | 990970203 | BJERKREIM |
| MAGNE HOPE AS ENTREPRENØRFORRETNING | 918366016 | ALVER |
| MAGNE MAGLER WIGGEN SIVILARKITEKTER MNAL AS | 979423705 | OSLO |
| MAGNE OG JAN BERGET ANLEGGSDRIFT AS | 933846539 | ØVRE EIKER |
| MAGNE OPLAND AS | 976755421 | VEFSN |
| MAGNE SVEEN AS | 860318822 | VESTRE TOTEN |
| MAGNUS EICHINGER VASSBOTN | 985305757 | VOLDA |
| MAGNUS TRANDEM AS | 925815349 | INDRE ØSTFOLD |
| MAJO BYGG AS | 831097272 | ALVER |
| MAKE ARKITEKTER AS | 813016702 | OSLO |
| MAKE MAKE AS | 927761807 | OSLO |
| MALAK RØRSERVICE AS | 913916034 | OSLO |
| MALARCHITECTURE AS | 998597919 | OSLO |
| MALERCOMPAGNIET OSLO AS | 960992482 | OSLO |
| MALERFIRMA MONSEN AS | 995474115 | BERGEN |
| MALERHUSET AS | 988118656 | OSLO |
| MALERMESTER BUER AS | 819391122 | LILLESTRØM |
| MALERMESTER JENS PETTER LUNDE AS | 939640533 | OSLO |
| MALERMESTER MEUSBURGER AS | 924447788 | ULLENSVANG |
| MALERMESTER STUDSRUD AS | 880387642 | MARKER |
| MALERMESTER STURE BRÆKSTAD AS | 976523822 | TRONDHEIM |
| MALERMESTRENE JUUHL & BRATFOSS AS | 997327888 | OSLO |
| MALER'N KARLSEN AS | 992334754 | GAUSDAL |
| MALERSVENN ANTONIO DIAS AS | 933484165 | OSLO |
| MALMIN ENTREPRENØR AS | 914561345 | SANDNES |
| MALMO OG UGELSTAD EIENDOMSSERVICE AS | 989361112 | RINGSAKER |
| MALOLO EIENDOM AS | 818505752 | TRONDHEIM |
| MÅLØY BYGGSERVICE AS | 992230487 | KINN |
| MÅLØY EIENDOMSUTVIKLING AS | 929338650 | KINN |
| MÅLØY RØR AS | 987904747 | KINN |
| MÅLSELV BYGG AS | 989965832 | MÅLSELV |
| MÅLSELV MASKIN & TRANSPORT AS | 818313942 | MÅLSELV |
| MAMA BYGG AS | 915743358 | LIER |
| MANDAL BYGG AS | 917131392 | LINDESNES |
| MANDAL KJØLESERVICE AS | 991622497 | LINDESNES |
| MANDAL RØRLEGGERSERVICE AS | 998028078 | LINDESNES |
| MANDT BYGG AS | 922140820 | INDRE ØSTFOLD |
| MANGE BEKKER ARKITEKTUR AS | 824958742 | LILLEHAMMER |
| MANGLERUD RØRLEGGERBEDRIFT AS | 990400970 | OSLO |
| MANNA RØRSERVICE AS | 931049682 | RINGERIKE |
| MANNDALEN MASKIN AS | 897935082 | KÅFJORD |
| MANNHART AS | 919042214 | LARVIK |
| MANTAS BYGG AS | 925063231 | BERGEN |
| MANTHEY KULA AS | 913076990 | OSLO |
| MAP ARKITEKTER AS | 992792426 | OSLO |
| MARBERG BYGG- OG TEGNESERVICE | 912054888 | SARPSBORG |
| MARBRE AS | 989822160 | NES |
| MARBRE EIENDOM AS | 985711089 | NES |
| MARCIN PRZEDLACKI | 812221892 | OPPDAL |
| MARCUS - HANDVERKER AS | 924971118 | BÆRUM |
| MARDAL RØR AS | 981406192 | GLOPPEN |
| MARI IGESUND SIVILARKITEKT AS | 922737509 | OSLO |
| MARINA HARBOUR SOLUTIONS AS | 934825365 | ØRSTA |
| MARINE ALUMINIUM AS | 988419486 | KARMØY |
| MARINE METALL AS | 924374462 | FRØYA |
| MARINI CONSULTING AS | 932087537 | LILLESTRØM |
| MARITIM SVEISESERVICE AS | 917318964 | TROMSØ |
| MARIUS EGELAND ARKITEKTER AS | 937719701 | LILLESAND |
| MARIUSSKIVENES AS | 932497220 | HAMAR |
| MARIUS WAALE AS | 927068362 | LARVIK |
| MARK ARKITEKTER AS | 912613240 | STAVANGER |
| MARKER ANLEGG AS | 894968672 | MARKER |
| MARKUSSEN MASKIN AS | 927426994 | VESTVÅGØY |
| MARKVEIEN EIENDOM AS | 933918122 | OSLO |
| MARLOW ARKITEKTER AS | 993312681 | BÆRUM |
| MARMINA AS | 929208900 | LØRENSKOG |
| MARSELL BYGG AS | 931795414 | HVALER |
| MARSTEEN VVS | 955576799 | OSLO |
| MÅRSTIG BYGG AS | 917962367 | BERGEN |
| MARTA EGGERTSEN BÆREKRAFT, BYPLAN OG ARKITEKTUR AS | 923578668 | ARENDAL |
| MARTEAM. AS | 912219593 | FROGN |
| MARTENS TAKST AS | 915765416 | OSLO |
| MARTHINSEN & DUVHOLT AS | 980416976 | SANDEFJORD |
| MARTIN FREDRIKSEN VVS AS | 992682485 | SYKKYLVEN |
| MARTIN JARNÆS NILSEN AS | 979497660 | NITTEDAL |
| MARTIN J. HOLTER AS | 992687002 | HVALER |
| MARTIN LID TRELAST AS | 957393926 | VOSS |
| MARTIN M BAKKEN AS | 910401017 | ELVERUM |
| MARTIN PRESTEGÅRD AS | 990341354 | BERGEN |
| MARTIN RØNNING AS | 985868506 | ASKER |
| MARTINSEN BAD & BOLIG AS | 918327967 | OSLO |
| MARTINSEN BETONG AS | 898197832 | MELHUS |
| MARTINSEN BYGG | 928698181 | DRAMMEN |
| MARTINSEN BYGG (GM) AS | 930790923 | ASKER |
| MARTINSEN OG SØNN | 922430969 | FREDRIKSTAD |
| MARTINSEN & STENSTAD BOLIGENTREPRENØR AS | 991408754 | BÆRUM |
| MASIV BYGG AS | 943612226 | KLEPP |
| MASKIN & EIENDOM AS | 912174115 | TROMSØ |
| MASKIN ENTREPRENØREN AS | 833378732 | ASKØY |
| MASKINENTREPRENØR ESPEN JOHANSEN AS | 935173051 | SENJA |
| MASKINENTREPRENØR FUNDAMENTERING OG GRAVING AS | 936948340 | TROMSØ |
| MASKINENTREPRENØR HÅKON ROGSTAD AS | 998397189 | RINGSAKER |