Bedrift O - Vika
- Oceanlive
- Omakase
- Onlinevisa AS
- Orthopraxis AS
- Ommen AS
- Oceanrisk AS
- Outnorth
- Oslo Tingrett
- Oleh Prykhod
- Oleh Prykhod
- Oü Elukaar
- Oslo Rokrets
- Olympia Uitzendbureau B.V.
- Ot-Tank AB
- Optibelt Skandinaviska AB
- Outscale Aps
- Oni-Wärmetrafo Gmbh
- Optibelt Skandinaviska AB
- Oni-Wärmetrafo Gmbh
- Outscale Aps
- Olsen Thomas
- Onlinecorner IT B.V.
- Onlinecorner Computersysteme Gmbh
- Onlinecorner IT B.V.
- Onlinecorner Computersysteme Gmbh
- Oslo Tingrett
- Oslo Forest AS
- Oslo Engineering AS
- Oslo Sjømannsforening
- Odden Forvaltning AS
- Omsorgs Norge AS
- Oslo Wave AS
- Oslo Bulk AS
- Oslo Carrier AS
- Ooni Norway AS
- Otterskog Oskar
- Olesksandr Volynskyi
- Oslo Maskinistforening
- Offshore 1 AS
- Obrestad Storyconsult
- Oslo Flytt AS
- Oslo Damekor
- Ocean Floor Geophysics INC
- Offshore Engineering Sweden AB
- Ocean Floor Geophysics INC
- Offshore Engineering Sweden AB
- Opera til Folket
- Olymp Bezner Kg
- Olymp Bezner Kg
- Oslo Offentlig Boliginvest AS
- Oslo Sjømannsforenings Stiftelse
- Oslo Caribbean Carrier AS
- Oslo ABC Invest AS
- Oslo Bulk Beta AS
- Oseberg Solutions AS Avd Oslo
- Oslo Bulk Alpha AS
- Oslo Ship Service AS
- Oslo Sjømannsforening Selskapslokaler
- Oslo Maskinistforenings Stiftelse
- Oh! My Car AS
- Original Brands Sweden AB
- Oyster Hr Norway AS
- Onwudiwe Chinwend 4
- Ola Jostein Jørgensen
- Olaru Digital Services
- Odin Ottem Berntsen
- Oslo Advokat Ruv AS
- Oslobarnehagenes Foreldre Forening (Off)
- 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