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| MARTINSEN ANLEGG AS | 911736489 | NORD-AURDAL |
| MARTINSEN BAD & BOLIG AS | 918327967 | OSLO |
| MARTINSEN BETONG AS | 898197832 | MELHUS |
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| MARTINSEN & STENSTAD BOLIGENTREPRENØR AS | 991408754 | BÆRUM |
| MASIV BYGG AS | 943612226 | KLEPP |
| MASKIN & EIENDOM AS | 912174115 | TROMSØ |
| MASKINENTREPRENØR EGIL ÅSTAD AS | 834715112 | EIDSVOLL |
| MASKIN ENTREPRENØREN AS | 833378732 | BERGEN |
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| Maskinentreprenør Lobben & Skinstad A/S | 945856335 | ØVRE EIKER |
| MASKINENTREPRENØR MONAN AS | 922960690 | KRISTIANSAND |
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| MASKIN ENTREPRENØR ROGER NÆRUM AS | 889568232 | SKIEN |
| MASKINENTREPRENØR RUNE HORVE | 992498218 | KRISTIANSAND |
| MASKINENTREPRENØR S. HAMMERSETH | 969410737 | KINN |
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| MASKINFIRMA ÅGE SIMONSEN & SØNN AS | 986550224 | ARENDAL |
| MASKINKRAFT AS | 977485576 | RINGSAKER |
| MASKIN OG UTEMILJØ AS | 987902817 | INDRE ØSTFOLD |
| MASKINSERVICE Arne Jørgen Bøhnsdalen | 980649121 | KONGSVINGER |
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| MATHISEN BYGGRÅDGIVING | 991784691 | LARVIK |
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| MATS ANDRE GJØEN | 925418439 | BJØRNAFJORDEN |