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| MANDAL KJØLESERVICE AS | 991622497 | LINDESNES |
| MANDAL PIPEFIKS AS | 819474222 | 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 |
| MANNIMASKIN AS | 920262023 | OSLO |
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| 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 |
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| MARINA SOLUTIONS AS | 995524252 | SULA |
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| MARINE METALL AS | 924374462 | FRØYA |
| MARINI CONSULTING AS | 932087537 | LILLESTRØM |
| MARITEX MARINE AS | 916820615 | KLEPP |
| 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 |
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| MARKER ANLEGG AS | 894968672 | MARKER |
| MARKUSSEN MASKIN AS | 927426994 | VESTVÅGØY |
| MARLOW ARKITEKTER AS | 993312681 | BÆRUM |
| MARMINA AS | 929208900 | LØRENSKOG |
| MARSELL BYGG AS | 931795414 | HVALER |
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| MARTIN FREDRIKSEN VVS AS | 992682485 | SYKKYLVEN |
| MARTIN JARNÆS NILSEN AS | 979497660 | NITTEDAL |
| MARTIN J. HOLTER AS | 992687002 | HVALER |
| MARTIN KRISTIANSEN AS | 912805441 | OSLO |
| MARTIN LID TRELAST AS | 957393926 | VOSS |
| MARTIN M BAKKEN AS | 910401017 | ELVERUM |
| MARTIN PRESTEGÅRD AS | 990341354 | BERGEN |