 | LYS OG VARME AS | 977356067 | OSLO |
| LYSPUNKTET AS | 975360296 | OSLO |
| LYSSAND BYGG & BETONG AS | 914634385 | BJØRNAFJORDEN |
| LYSSAND MASKIN | 998887585 | BJØRNAFJORDEN |
| LYSTEKNIKK ELEKTROENTREPRENØR AS | 995971135 | OSLO |
| LYST ELEKTRO AS | 916491840 | OSLO |
| M2 BYGG & DESIGN AS | 925732915 | NORDRE FOLLO |
| M2 TOMTEUTVIKLING AS | 911640260 | STAVANGER |
| M3 BETONG AS | 929112091 | KVAM |
| M4 ENTREPRENØR AS | 926500449 | BÆRUM |
| MA BYGG & VVS AS | 929094018 | OSLO |
| MAC ENTREPRENØR AS | 925781576 | MOSS |
| MAD FREDRIKSTAD AS | 928286991 | FREDRIKSTAD |
| MAD OSLO AS | 916087578 | OSLO |
| MAD VEST AS | 912320898 | BERGEN |
| 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 |
| MÅGE&NISTAD BYGG AS | 993587753 | KVINNHERAD |
| MAGNA PROSJEKT SØR AS | 823569262 | LINDESNES |
| MAGNAR INSTANES AS | 989995502 | ULLENSVANG |
| MAGNAR LUND MASKIN AS | 989986384 | FLEKKEFJORD |
| MAGNAR SKJÆVELAND MURMESTER | 970112243 | SANDNES |
| MAGNAR STOKKE AS | 914415888 | MELHUS |
| MAGNE DAG BRAGELIEN | 970956808 | SEL |
| MAGNE HAFSTAD AS | 974536935 | SUNNFJORD |
| MAGNE HELLAND AS | 990970203 | BJERKREIM |
| MAGNE HOPE AS ENTREPRENØRFORRETNING | 918366016 | ALVER |
| MAGNE MAGLER WIGGEN SIVILARKITEKTER MNAL AS | 979423705 | OSLO |
| MAGNE NORHEIM ENTREPRENØRFORRETNING | 885225802 | BERGEN |
| MAGNE OG JAN BERGET ANLEGGSDRIFT AS | 933846539 | ØVRE EIKER |
| MAGNE OPLAND AS | 976755421 | VEFSN |
| MAGNE SVEEN AS | 860318822 | VESTRE TOTEN |
| MAGNETUN MASKIN AS | 815185382 | GOL |
| MAGNUS EICHINGER VASSBOTN | 985305757 | VOLDA |
| 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 |
| MALAK RØRSERVICE AS | 913916034 | OSLO |
| MALARCHITECTURE AS | 998597919 | OSLO |
| MALERCOMPAGNIET OSLO AS | 960992482 | OSLO |
| MALERFIRMA MONSEN AS | 995474115 | BERGEN |
| MALERHUSET AS | 988118656 | OSLO |
| MALERMESTER BUER AS | 819391122 | LILLESTRØM |
| MALERMESTER GREGERSEN AS | 998142482 | LUNNER |
| MALERMESTER JENS PETTER LUNDE AS | 939640533 | OSLO |