 | OLAV HOVDE AS | 887832552 | RINGSAKER |
| OLAV KRISTIAN OPPEDAL | 970357947 | LARVIK |
| OLAV LANGLO | 979429967 | TRONDHEIM |
| OLAV LINDSTØL AS | 934031180 | GRIMSTAD |
| OLAV O. HÆREID AS | 948839946 | ÅRDAL |
| OLAV SKARET | 983401686 | GOL |
| OLAV SOLBERG AS | 941579833 | OPPDAL |
| OLAV SOLVANG AS | 976502337 | TOKKE |
| OLAV STEINAR BJORDAM | 970895434 | BAMBLE |
| OLDEN RØR AS | 939792686 | STRYN |
| OLEBAKKEN MASKIN AS | 926888447 | NORDRE LAND |
| OLE B. MORK AS | 992115653 | FLATANGER |
| OLE BROR BENTSEN AS | 986368620 | LIER |
| OLE CHRISTIAN ORDERUD | 922036640 | LILLESTRØM |
| OLE CHRISTOFFER BRINGEBØEN | 988643424 | LUSTER |
| OLE DAN FUGLESTRAND | 988586927 | GLOPPEN |
| OLE-FREDRIK MOSS | 916940335 | SØR-ODAL |
| OLE F SUHR AS | 997725697 | ALTA |
| OLE GEORG STORUM | 983409709 | BJØRNAFJORDEN |
| OLE HÅKON LOFTHUS AS | 917392366 | ETNEDAL |
| OLEHUS AS | 917570809 | STAVANGER |
| OLE KRISTIAN MOEN | 970393641 | INDRE ØSTFOLD |
| OLE KRISTIAN MORKEN | 914335485 | NORD-FRON |
| OLE M. ALMELI AS | 942657749 | EIDSVOLL |
| OLE MARIUS SKJELIN | 991451277 | SARPSBORG |
| OLE MARKUSSEN OG SØNNER AS | 969013096 | OSTERØY |
| OLE MARTHIN KRISTIANSEN | 971009918 | BAMBLE |
| OLE MARTIN LANNER | 984233639 | LARVIK |
| OLE MARTIN SNEKKEVÅG | 919905905 | FJALER |
| OLE M DOBLOUG | 979644132 | RINGSAKER |
| ØLEN BYGGSERVICE AS | 923048235 | VINDAFJORD |
| OLE OG TORES RØRSERVICE AS | 987289597 | KRAGERØ |
| OLE P. BAKKEN AS | 928195678 | HOLTÅLEN |
| OLE PETTER STRØMME AS | 988283142 | VINJE |
| OLE RISTE BYGGEVIRKSOMHET | 970058362 | FJORD |
| OLE SIVERTSEN AS | 817842712 | TRONDHEIM |
| OLE TERJE JOSDAL | 977099544 | SIRDAL |
| OLE TOM EGER FJELLSPRENGING AS | 997104676 | TØNSBERG |
| O. LILLEÅS GRUSTAK/TRANSPORT | 990698651 | ORKLAND |
| OLIMB ANLEGG AS | 997409841 | RÅDE |
| OLIMB RØRFORNYING AS | 997447018 | RÅDE |
| OLIVA PARK AS | 920721095 | SARPSBORG |
| O L KYTHE AS | 935252601 | VOSS |
| O.Løkken A/S | 931515829 | TRONDHEIM |
| OLS1 HOLDING AS | 920471129 | LINDESNES |
| OLS1VVS AS | 820951522 | DRAMMEN |
| OLSENBYGG GRIMSTAD AS | 998339898 | GRIMSTAD |
| OLSEN MASKINENTREPRENØR AS | 915939686 | BJØRNAFJORDEN |
| OLSEN MASKIN & TRANSPORT AS | 919898690 | DØNNA |
| OLSEN RØRLEGGERSERVICE AS | 927532751 | STANGE |