Bedrift O - Frogner Oslo
- Oft AS
- Olili AS
- Oik AS
- Okb AS
- Oeio AS
- Okamo AS
- Oceanness AS
- Olofssons
- Overita AS
- Ola & Co AS
- Optigon AS
- Osvest AS
- Ole AS
- Odi Europe Ltd
- Olha Odlivanska
- Opus Skateboard DA
- Oliver Persson
- Owesen Prosa
- Olema Invest AS
- Oddvar Aurstad
- Oddbjørn Overskott
- Offyx Equity AS
- Oda Fish AS
- Oscar Wicken
- Oslo Airdome
- Oslo Airdome
- Ola Jordhøy
- Ozone Skandinavia AS
- Obm Drift AS
- OSL Contemporary AS
- Oslo Nowhere AS
- Osay Holding AS
- Omsåsen Utvikling AS
- Opplevelses Design
- Oslo Kvartetforening
- Olsen Events
- Oli Eiendom AS
- Olaska Holding AS
- Opera Andersen
- Olrich Invest AS
- Otero Media AS
- Os Advokater DA
- Oslo Myntgalleri AS
- Oase Media AS
- Operis Consulting AS
- Oma Group AS
- Oscar Pressebyrå AS
- Olsen Barhjelp
- Oslo Sykkelpolo
- Olivia Birkebro
- Oros Norge AS
- Ovibos Investments AS
- Omrod Invest AS
- Oslo Museum
- Oslo Syn AS
- Olsen Automasjon
- Omsorg Konsult AS
- Orfeus Publishing AS
- Oslo Eiendomsinvestering AS
- Oslo Utleie AS
- Ole Tørklep
- Ona Studio AS
- Optimalt Renhold AS
- Oslo Byinvest AS
- Oftebro Elisabeth
- Ola L. AS
- Ole Bjarne Kverneland
- O. Steen Holding AS
- Ottesen Psyk.Veiledning
- Oneint Lebal Limited
- Olav Kaspar Melle
- Oliver Morgan William
- Oslo Salgsvogn Utleie AS
- Oslo Limo Xhilaga
- Ocn Eiendom AS Tvangsavviklingsbo
- Ocn Eiendom AS Tvangsavviklingsbo
- Opsal og Gabrielsen AS
- Olav Rønningen Wangensteen
- Oslo Guide Company AS
- Okamo Bogstadveien 39 AS
- Odel Hydro Invest AS
- Odel Hydro 1 AS
- O.Øen Invest AS
- Oscar Werner Productions
- Offshore Innovation Christophersen
- Oslo Byggmester Filipenkovs
- Oslo Kunstløpklubb Il
- Oppussingsservice Jacek Ciaputa
- Oslo Kunstløpklubb Il
- Olaisen Ylva Johnsen
- Oslo Team Trafikkopplæring AS
- Oddvar Mareno Nilsen
- Oslo Property Development AS
- Oslo Team Trafikkskole AS
- Odinsgt 13 B AS
- Oslo Beauty Center AS
- Oslo Peace Week AS
- Ole Falk Frederiksen
- Otto Closs Konsulenttjenester AS
- Oskar Wintertidh Consulting
- Oslo Band Hospits
- Oslo Private Legevakt AS
- Oslo vest Rotary Klubb
- Oslo Jordmor og Ultralydklinikk AS
- Ohc Arkitektur & Design AS
- Orozco Martinez Theater Projects
- Ovmo Rådgivning Monsen Dødsbo
- Ola Grimsby Institute Europe AS
- Oslo Tannlegevakt Anita Berntzen
- Orazio A. C. Truglio
- Ori Fur i Norge
- Oslo Online Johanne Askedal
- Ori Fur i Norge
- Oberst Rodes vei 46 AS
- Ole Herman Schøyen Sjölin
- Ole-Christian Kreyberg Normann
- Olsen Ella M Cavnicka Psykolog
- Ot Consulting Ole Bendik Thorvik
- Operasjonssykepleier Kaja Katrine Gulseth-With
- Oslo Ashihara Karate og Fysioterapi AS
- Oab Helse Ulv Ola Adelsten Bredal
- Oil On Canvas By Kari Eig
- Organic Pet Heaven Victoria Swane Høisæther