Bedrift O - Ryen
- Ortopedisenteret AS
- Ojbygg AS
- Ojbygg AS
- Ortopediteknikk AS
- Ovidiu Hominius
- Olandia AS Konkursbo
- Olandia AS Konkursbo
- Oslo Movement ANS
- Ola Ringsbu
- Orvei Holding AS
- Orteno Eiendom AS
- Orbis M AS
- O. Berge AS
- Optimal Elektro AS
- Oslo Brodering AS
- Ortopediteknikk AS Avd Oslo
- Orona Norway AS
- Optimal Norge AS
- Obtec Alexandre Menguy
- Oslo Bouledrome Alliance
- Ok Lande Holding AS
- Omed Rahim Sharif
- Oscar Records, Askerøi
- Oee 1913 Holding AS
- Optimal Elektro Holding AS
- Orona Norway avd Oslo
- Oris Dental Ryen
- Oasis Family Life Ministry
- Oasis Family Life Ministry
- Oslo Bad & Renovering AS
- Oslo og Omegn Bussarbeiderforening
- Oslo Movement Erik Cederberg
- Ortosol Trond Helge Johnsen
- Oslo Rør og Varme AS
- Olis VVS & Gass Service AS