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| MAC ENTREPRENØR AS | 925781576 | MOSS |
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| MADSEN ENTREPRENØR AS | 934640462 | VESTRE TOTEN |
| MÆLAND RØR AS | 887574952 | HÅ |
| MÆLEN BLIKK OG VENTILASJON AS | 919653191 | TRONDHEIM |
| MÆLEN MASKIN AS | 919924012 | ORKLAND |
| MAEM BYGGSERVICE AS | 923167064 | ORKLAND |
| MA ENTREPRENØR AS | 990250448 | OSLO |
| MAE PROSJEKT AS | 933901637 | LIER |
| MÅGE&NISTAD BYGG AS | 993587753 | KVINNHERAD |
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| MAGNAR SKJÆVELAND MURMESTER | 970112243 | SANDNES |
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| MAGNE HELLAND AS | 990970203 | BJERKREIM |
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| MAGNE OG JAN BERGET ANLEGGSDRIFT AS | 933846539 | ØVRE EIKER |
| MAGNE OPLAND AS | 976755421 | VEFSN |
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| MAGNETUN MASKIN AS | 815185382 | GOL |
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| MAGNUS TRANDEM AS | 925815349 | INDRE ØSTFOLD |
| MAJO BYGG AS | 831097272 | ALVER |
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| MAKE MAKE AS | 927761807 | OSLO |
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| MÅLØY BYGG AS | 923117644 | KINN |