 | SIGURD FURULUND MASKIN AS | 976950275 | ULLENSAKER |
| SIGURD OG OLA GRIMSTAD AS | 971587229 | GAUSDAL |
| SIGURD OPHEIM AS | 884492122 | BERGEN |
| SIGVARTSEN ANLEGGS SERVICE | 932247402 | NORD-ODAL |
| SIGVE HAMRE MASKIN AS | 931453734 | SANDNES |
| SIKVELAND STÅLE NOROLV | 970311157 | TIME |
| SILJAN BYGG AS | 828490192 | OSLO |
| SILJUBERGSÅSEN HÅNDVERKSTJENESTER | 928848094 | ELVERUM |
| SILKOSET BYGG AS | 983928447 | ELVERUM |
| SIMBRA RÅDGIVNING AS | 922618585 | HAMAR |
| SIMEN HØGSTAD MASKINENTREPRENØR AS | 922796459 | MIDT-TELEMARK |
| SIMEN KVISSEL ENTREPRENØR | 997248430 | ELVERUM |
| SIMEX ELEKTRO AS | 917356181 | STAVANGER |
| SIMEX RØR AS | 917718393 | STAVANGER |
| SIMM AS | 987872756 | BERGEN |
| SIMONA STADPIPE AS | 981928652 | STAD |
| SIMONSEN MASKIN AS | 960292154 | BODØ |
| SIMTEK VVS LTD NUF | 991400168 | OSLO |
| SIMUNDSET & GROEGGEN DRIFT AS | 931676059 | ORKLAND |
| SINDRE MYHRSVEEN HOLDING AS | 820641752 | RINGEBU |
| SINDSEN MASKIN AS | 913673611 | HOLMESTRAND |
| SINGH RØR AS | 925946877 | LILLESTRØM |
| SINUS AS | 984548621 | ALSTAHAUG |
| SINUS BODØ AS | 983156207 | BODØ |
| SINUS BRØNNØYSUND AS | 953343339 | BRØNNØY |
| SINUS ELEKTRO AS | 989059335 | SANDNES |
| SINUS MOSJØEN AS | 996301559 | VEFSN |
| SIO RØR AS | 922053278 | KRAGERØ |
| SIQVELAND & TØNNESSEN AS | 913727304 | TIME |
| SIRDAL BYGG AS | 981906136 | SIRDAL |
| SIRDAL HANDLAFT AS | 877545512 | SIRDAL |
| SIRDAL HYTTER OG HUS AS | 984669712 | SIRDAL |
| SISTE SPIKER AS | 918052739 | VENNESLA |
| SITE SERVICE AS | 996427544 | NITTEDAL |
| SITE SERVICE BANE AS | 925622516 | MOSS |
| SITHA VVS TEAM AS | 991354743 | BERGEN |
| SIV ARK TANJA VARDUND AS | 912570223 | OSLO |
| SIVERT MONTASJE AS | 930047066 | SKIEN |
| SIVILARKITEKT BENTE KRONEN | 930724297 | LARVIK |
| SIVILARKITEKT CAMILLA KOLBENSTVEDT | 981470400 | OSLO |
| SIVILARKITEKT MNAL LEIF LARSEN AS | 979962274 | SANDNES |
| SIVILARKITEKT MNAL OLE JOHAN DOLVA | 929955323 | KRISTIANSAND |
| SIVILARKITEKT NINA STOKSET NILSEN | 970146342 | KRISTIANSAND |
| SIVILARKITEKT TONE LIEN | 992548436 | OSLO |
| SIVILARKITEKT TORDIS HOEM AS | 976501187 | OSLO |
| SIVILING ANDERS BALSTAD AS | 916175205 | BÆRUM |
| SIVILINGENIØR ALBERT ØLNES AS | 989267485 | NESODDEN |
| SIVILINGENIØR ALEKSIC | 929931777 | OSLO |
| SIVILINGENIØR BJARTE FYLLINGEN AS | 935600189 | BERGEN |
| SIVILINGENIØRENE HAUG OG BLOM-BAKKE AS | 943276390 | OSLO |