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| OLAF PAULSEN & SØNN AS | 979564511 | KRAGERØ |
| OLAF PETTERSEN AS | 980383644 | HERØY (N.) |
| OLA HOFF ENTREPRENØR AS | 982010004 | GRAN |
| O LANGSETER & SØNN AS | 926744518 | NORDRE FOLLO |
| OLA RAAEN AS | 948698293 | STJØRDAL |
| OLAUSSEN RÅDGIVENDE INGENIØRKONTOR AS | 970931783 | TØNSBERG |
| OLAV AGER-WICK AS | 929345223 | ARENDAL |
| OLAV A. VÅGE MASKIN AS | 916941161 | SANDE (MØRE OG ROMSDAL) |
| OLAV ERIK HAGEN AS | 966265949 | STRYN |
| OLAV H HAUSO | 970203532 | ULLENSVANG |
| 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 |
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| OLDEN RØR AS | 939792686 | STRYN |
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| OLE B. MORK AS | 992115653 | FLATANGER |
| OLE BROR BENTSEN AS | 986368620 | LIER |
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| OLE CHRISTOFFER BRINGEBØEN | 988643424 | LUSTER |
| OLE DAGSVEEN | 890392032 | LILLEHAMMER |
| OLE DAN FUGLESTRAND | 988586927 | GLOPPEN |
| OLE-FREDRIK MOSS | 916940335 | SØR-ODAL |
| OLE F SUHR AS | 997725697 | ALTA |
| OLE GEORG STORUM | 983409709 | BJØRNAFJORDEN |
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| OLEHUS AS | 917570809 | STAVANGER |
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| 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 |
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| OLE RISTE BYGGEVIRKSOMHET | 970058362 | FJORD |
| OLE SIVERTSEN AS | 817842712 | TRONDHEIM |