Bedrift O - Vika
- Oceanlive
- Orbem Gmbh NUF
- Orbem Gmbh NUF
- Omakase
- Ommen AS
- Onlinevisa AS
- Oceanrisk AS
- Oslo Tingrett
- Oleh Prykhod
- Oleh Prykhod
- Oslo Rokrets
- Oü Elukaar
- Ot-Tank AB
- Olympia Uitzendbureau B.V.
- Optibelt Skandinaviska AB
- Outscale Aps
- Oni-Wärmetrafo Gmbh
- Optibelt Skandinaviska AB
- Outscale Aps
- Oni-Wärmetrafo Gmbh
- Olsen Thomas
- Onlinecorner IT B.V.
- Onlinecorner IT B.V.
- Oslo Tingrett
- Oslo Sjømannsforening
- Ofc Shipping AS
- Oslo Bulk AS
- Oslo Wave AS
- Oftedal Vekst AS
- Odden Forvaltning AS
- Oslo Engineering AS
- Oslo Carrier AS
- Ommen Leiligheter AS
- Ob2 Prosjekt AS
- Ommen Småhus AS
- Omsorgs Norge AS
- Oslo Flytt AS
- Oslo Fotballdommerlaug
- Oslo Maskinistforening
- Offshore 1 AS
- Offjord Eiendom AS
- Obrestad Storyconsult
- Oslo Damekor
- Olesksandr Volynskyi
- Offjord-Entreprenør AS
- Ocean Yacht Club AS
- Ocean Floor Geophysics INC
- Ocean Floor Geophysics INC
- Opera til Folket
- Olymp Bezner Kg
- Olymp Bezner Kg
- Oslo Sjømannsforening Selskapslokaler
- Oslo Offentlig Boliginvest AS
- Oslo ABC Invest AS
- Oslo Bulk Beta AS
- Oslo Bulk Alpha AS
- Oslo Caribbean Carrier AS
- Oseberg Solutions AS Avd Oslo
- Oslo Sjømannsforenings Stiftelse
- Olaru Digital Services
- Ola Jostein Jørgensen
- Oyster Hr Norway AS
- Original Brands Sweden AB
- Oslo Maskinistforenings Stiftelse
- Onwudiwe Chinwend 4
- Oslo Advokat Ruv AS
- Oh! My Car AS
- Oris Dental Nationaltheatret Tannregulering
- Oslobarnehagenes Foreldre Forening (Off)
- Oscar de Vibe Vanay
- Ole Magnus Arnessen Kikut
- Omnia Power S.R.L.
- Omnia Power S.R.L.
- Oslo Flytt & Rengjøring Hedin
- Ost-West Anlagenmontage S.R.O.
- Ost-West Anlagenmontage S.R.O.
- Organisasjon for Barn og Unge Jabuka