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| MATHISEN AS | 951648736 | RINGSAKER |
| MATHISEN BYGGRÅDGIVING | 991784691 | LARVIK |
| MATHISEN VVS AS | 911825120 | MOLDE |
| MATS ANDRE GJØEN | 925418439 | BJØRNAFJORDEN |
| MATS HUS AS | 967385816 | TANA |
| MAURA BYGG AS | 926038508 | NANNESTAD |
| MAXBO TEKNISKE TJENESTER AS | 924463163 | PORSGRUNN |
| MAXIM AS | 935915104 | HOLE |
| MAXI TJENESTER AS | 988188573 | SENJA |
| MAX PFISTER AS | 980464075 | GRIMSTAD |
| MAX-RØR AS | 997836871 | DRAMMEN |
| MAXRØR AS | 997265696 | BERGEN |
| MAXWELL NORGE AS | 913492528 | TRONDHEIM |
| MAZ SERVICE AS | 926574248 | NARVIK |
| MBA ENTREPRENØR AS | 990694001 | RANA |
| MB ANLEGG AS | 820721462 | GAUSDAL |
| M BJØRGUM MASKINSTASJON AS | 980915395 | HOLTÅLEN |
| MBM PROSJEKT AS | 814759032 | LIER |
| MBPROFF AS | 997952340 | KARMØY |
| MB RØRINDUSTRI AS | 928755487 | BAMBLE |
| MB VVS AS | 929557328 | OSLO |
| M BYGG AS | 917583013 | LUNNER |
| M CARLSEN & SØNN AS | 998540860 | GRAN |
| MCE AS | 982837553 | ETNE |
| MC RØR AS | 913015762 | KONGSBERG |
| MD FREMBYGG AS | 931791451 | LIER |
| MDH ARKITEKTER AS | 995117398 | OSLO |
| MDM BYGG AS | 822205542 | STAVANGER |
| M DOBLOUG AS | 885866522 | RINGSAKER |
| ME ANLEGGSSERVICE AS | 913169298 | ASKER |
| MECC AS | 829609142 | DRAMMEN |
| MEDALEN MASKIN AS | 995407795 | SIGDAL |
| MED BYGGMESTER AS | 932953226 | PORSGRUNN |
| MEDHUS AS | 921378920 | ÅL |
| MEDVIND ARKITEKTUR AS | 925597384 | BÆRUM |
| MEINICH ARKITEKTER AS | 925974625 | OSLO |
| MEKVIK MASKIN AS | 914240980 | KRISTIANSUND |
| MELBA VVS AS | 964816565 | OSLO |
| MELBY MASKIN AS | 961611571 | EIDSKOG |
| MELCON AS | 939847065 | AURLAND |
| MELDAL BLIKKENSLAGERVERKSTED AS | 944444378 | ORKLAND |
| MELHUS BYGG & EIENDOM AS | 919932511 | MELHUS |
| MELING BYGGTEKNIKK AS | 925179701 | STAVANGER |
| MELKEVOLL MASKIN AS | 992834013 | STRYN |
| MELLBYE ARKITEKTUR INTERIØR AS | 945844159 | OSLO |
| MELLEBYGG AS | 988975699 | LØRENSKOG |
| MELLEMSTRAND ANLEGGSERVICE AS | 992121386 | KLEPP |
| MELLES RØRLEGGER AS | 923668861 | KRISTIANSAND |
| MELSOM ARKITEKTUR | 931431358 | OSLO |