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| MAGNE MAGLER WIGGEN SIVILARKITEKTER MNAL AS | 979423705 | OSLO |
| MAGNE NORHEIM ENTREPRENØRFORRETNING | 885225802 | BERGEN |
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| MAGNE OPLAND AS | 976755421 | VEFSN |
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| MAGNETUN MASKIN AS | 815185382 | GOL |
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| MAGNUS M THUNESTVEDT AS | 937610440 | OSTERØY |
| MAGNUS TRANDEM AS | 925815349 | INDRE ØSTFOLD |
| MAJO BYGG AS | 831097272 | ALVER |
| MAKE ARKITEKTER AS | 813016702 | OSLO |
| MAKE MAKE AS | 927761807 | OSLO |
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| MALER'N KARLSEN AS | 992334754 | GAUSDAL |
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| MÅLSELV BYGG AS | 989965832 | MÅLSELV |
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| MAMA BYGG 1 AS | 912007987 | LIER |
| MAMA BYGG AS | 915743358 | LIER |
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| MANDT BYGG AS | 922140820 | INDRE ØSTFOLD |
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| MANNA RØRSERVICE AS | 931049682 | RINGERIKE |
| MANNDALEN MASKIN AS | 897935082 | KÅFJORD |