Bedrift O - Frogner
- Objectfront AS
- Ozonvann AS
- Ove's Sportsfiske AS
- Oslo Snekkerverksted AS
- Ole Vardøy
- Olav Berger
- Osdalen Hytteeierforening
- Ozols Edgars
- Ozols Edgars
- Osloveien 10 AS
- Oppegård Invest AS
- Oslo Varmeservice AS
- Oslo Storbilvask AS
- Otd Akademiet AS
- Olsen Tommy
- Osloviken Entreprenør AS
- Oslo Storbilvask AS
- Oa Betong AS
- Optimal Bedriftservice AS
- Oslo Betongtransport AS
- Olegs Podskocevs Konkursbo
- Ole Per Hustad
- Oslo Communication AS Konkursbo
- Oslo Volkswagen Club
- Oslo Communication AS Konkursbo
- Ole-Kristian Romsaas
- Olegs Podskocevs Konkursbo
- Oslo West Finest
- Oslo West Finest
- Ole-Kr Romsaas
- Ole-Harald Rustad
- Ok Romsaas Holding AS
- Ola Martin Brændjord
- Ole-Gunnar Holm
- Oslo Seafood Center AS
- O.A.Nysæther AS
- Opp & Ned AS
- Oslo Bilspektrum Waseem Mahmood
- Ozo Transport Andis Ozols
- Olsen Grønn Fremtid Vegard
- Opplæringskontoret for Elektrofag Romerike
- Oslo og Akershus Langholdsklubb
- O2 Medic & Rescue Olstad
- Olai Tisthammer Massasje og Renhold
- Opplæringskontoret for Tele, Data og Elektro