 | ALL-RØR AS | 978653677 | TRONDHEIM |
| ALL-RØRFORNYING AS | 923994750 | TRONDHEIM |
| ALL SERVICE BREIM AS | 928573745 | GLOPPEN |
| ALLSIDIG ARKITEKT AS | 916544987 | TRONDHEIM |
| ALLSIDIG BYGG AS | 916635400 | MOLDE |
| ALLSIDIGE VVS AS | 975349128 | RÆLINGEN |
| ALLTAK AS | 816561892 | LØRENSKOG |
| ALLTID MILJØ AS | 924861363 | RÆLINGEN |
| ALLUM BYGG AS | 944485368 | LARVIK |
| ALLUM TRANSPORT AS | 858041732 | SILJAN |
| ALMAAS & SVEDAHL BYGGEFIRMA AS | 913856732 | TRONDHEIM |
| ALMA EIK AS | 998876605 | KRISTIANSAND |
| ALMÅS BYGG & BETONG AS | 925441139 | STORD |
| ALMÅS BYGG OG SNEKKERSERVICE | 814401332 | SANDEFJORD |
| ALMÅS MASKIN AS | 951843741 | MIDTRE GAULDAL |
| ALMEDALS RØRSERVICE AS | 924413964 | KRISTIANSAND |
| ALNA ELEKTRO AS | 917290970 | OSLO |
| ALNA RØR AS | 927075024 | LILLESTRØM |
| ALP BYGG AS | 919188111 | KONGSBERG |
| ALPHA ARKITEKTER AS | 976019474 | ARENDAL |
| ALPHA CONSULT AS | 920259472 | STORD |
| ALPHA ELEKTRO AS | 915767362 | NITTEDAL |
| ALPHA RØR SERVICE AS | 935174910 | LILLESTRØM |
| ÅL RØRSERVICE AS | 885080642 | ÅL |
| ALSAKER FJORDBRUK AS | 979494009 | TYSNES |
| ALSAKER STÅL AS | 930405361 | ASKØY |
| ALSTAD ENTREPRENØR AS | 912177211 | STEINKJER |
| ALSTAD MASKIN AS | 915920918 | BODØ |
| ALSTAD PUKK AS | 929417399 | HEIM |
| ALSTEN MASKINSTASJON AS | 959260494 | ALSTAHAUG |
| ALTA BYGGSERVICE AS | 920364667 | ALTA |
| ALTA EL AS | 978632408 | ALTA |
| ALTA GRAVESERVICE AS | 934264398 | ALTA |
| ALT.ARKITEKTUR AS | 989622943 | OSLO |
| ALT A RØR AS | 987216549 | ALTA |
| ALTA STÅL & CNC MASKINERING AS | 993866296 | ALTA |
| ALTBYGG AS | 998742803 | BERGEN |
| ALT HEIS AS | 922758832 | BERGEN |
| ALT I ANLEGG AS | 925160822 | ARENDAL |
| ALT I ASFALT AS | 995676605 | GJERDRUM |
| ALT I BYGG KONGSBERG AS | 998573831 | KONGSBERG |
| ALTI-EL AS | 928736970 | KONGSBERG |
| ALTIMUR AS | 917145369 | RÅDE |
| ALT INSTALLASJON AS | 979384378 | TØNSBERG |
| ALTIPLAN AS | 914864585 | OSLO |
| ALT I RØR AS | 935000548 | BERGEN |
| ALT KAN MALES AS | 926697080 | ASKER |
| ALTMULIGGUTTA TOTALREHABILITERING AS | 987972610 | OSLO |
| ALT RØRLEGGER & VAKTMESTER AS | 925597260 | HORTEN |
| Aluman Trondheim A/S | 846355022 | TRONDHEIM |