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| AQUA RØRSERVICE AS | 931007017 | TRONDHEIM |
| AQUA TECH AS | 971095245 | OSLO |
| AQUA VVS SENTERET AS | 983357601 | LARVIK |
| ARAI PROSJEKT AS | 996351122 | SKIEN |
| AR ANLEGG AS | 930899631 | KRISTIANSAND |
| ARA RØR AS | 930335967 | OSLO |
| ARBEIDSOM AS | 997998820 | STAVANGER |
| ARBO ENTREPRENØR AS | 966177810 | DRAMMEN |
| ARCA GLASS OG FASADE AS | 920554091 | STAVANGER |
| ARC ARKITEKTER AS | 978702481 | TRONDHEIM |
| ARC ARKITEKTUR AS | 914894603 | TIME |
| ARCELORMITTAL CONSTRUCTION NORGE AS | 976289862 | LILLESTRØM |
| ARCHI BYGG AS | 915137083 | OSLO |
| ARCHITECTOPIA AS | 997993381 | OSLO |
| ARCHUS ARKITEKTER AS | 943864306 | OSLO |
| ARC-ID AS | 991366997 | STORD |
| ARCO ENTREPRENØR AS | 960670507 | RAKKESTAD |
| ARCON ENTREPRENØR AS | 924771232 | OSLO |
| ARCON PROSJEKT AS | 963028644 | NAMSOS |
| ARCONSULT OVE BØE AS | 940758629 | ULLENSAKER |
| ARCON TØMRER OG EIENDOMSSERVICE AS | 931268597 | OSLO |
| ARCTIC B&C NORWAY AS | 820425022 | LØRENSKOG |
| ARCTIC BYGG AS | 983551564 | NORDKAPP |
| ARCTIC ELEKTRO AS | 814910652 | NORDKAPP |
| ARCTIC ENTREPRENØR AS | 993825743 | PORSANGER |
| ARCTIC INSTALLASJON AS | 990513821 | TROMSØ |
| ARCTIC SURVEY AS | 922790094 | RANA |
| ÅRDAL BLIKKENSLAGERSERVICE AS | 993088056 | ÅRDAL |
| ÅRDAL BYGGSERVICE AS | 880428152 | ÅRDAL |
| ÅRDAL OG SKEIE AS | 996500012 | HÅ |
| AREA BYGG AS | 913801547 | SANDEFJORD |
| AREAL+ AS | 920798462 | RINGEBU |
| AREAL BYGG AS | 985731926 | NITTEDAL |
| AREAL ENTREPRENØR AS | 922592136 | DRAMMEN |
| AREAL & PLAN AS | 992804076 | AURE |
| ARECO PROFILES AS | 981686985 | OSLO |
| ARENDAL BYGG AS | 826118172 | ARENDAL |
| ARENDAL EL TEAM AS | 916544480 | ARENDAL |
| ARENDAL KOMMUNE | 940493021 | ARENDAL |
| ARENDAL TAKSERVICE AS | 980726738 | ARENDAL |
| ARENDAL UTLEIE AS | 916672748 | ARENDAL |
| ARE TREINDUSTRIER ASKIM AS | 986375589 | INDRE ØSTFOLD |
| ARE TREINDUSTRIER KAUPANGER AS | 991780750 | SOGNDAL |
| ARGENTUM ENTREPRENØR AS | 984399472 | KONGSBERG |
| ARGON ELEKTRO AS | 932607131 | TRONDHEIM |
| ARILD ANDERSEN ELEKTRO AS | 974413663 | LARVIK |
| ARILD KOLSTAD A/S | 946488313 | INDRE ØSTFOLD |
| ARILD ROPSTAD BYGGFIRMA | 988718580 | KRISTIANSAND |
| ARILD TEIGLAND GJERSTAD | 976071581 | TYSNES |