Bedrift O - Bryn
- Okam AS
- Ohrmann Gmbh
- Ohrmann Gmbh
- Outland AS
- Otisklubben
- Odiin
- Optox AS
- Orgdot AS
- Outokumpu AS
- Otis AS
- Otis AS
- Osnordic AS
- Osnordic AS
- Oslo Billakkering AS
- Oslo Sambaskole
- Okam Gruppen AS
- Oslo Autoexperten
- Oslo Distribusjon AS
- Olena Stolbchenko
- Oslo Oppmåling AS
- Oslo Marineservice AS
- Oljeskiftexpressen Alna/Teisen
- Oslo Vedsentral
- Oslo bilservice AS
- Oljeskiftexpressen Alna AS
- Omicron Electronics Gmbh
- Omicron Electronics Gmbh
- Orleo Berisha
- Ola Kassen
- Outfit International AS
- Objekt Venture AS
- Olsson Robin
- Oc Industrier AS
- Osu Equipment AS
- Os Utvikling AS
- Opter Norge AS
- Oksana Pelyk
- One Electro AS
- Oslo Hundebarnehage AS
- Oakshelter Holding AS
- Odd Aanstad
- Olsen Restaurant
- Oyvind Fossan
- Omni SA
- Oliwia Szalewska
- Oslo Vocalis
- Oslo Vocalis
- Oslo Varebilutleie
- Oslo Revmatologipraksis
- Oslo Bygg AS
- Oslo Vaktmester AS
- Orr Holding AS
- Onv Avd 7121
- Oj Investering AS
- Oz Yasemine
- Oslo Distribusjon
- Oslo Villautvikling AS
- Oslo Square AS
- Oslo Isolasjonsservice AS
- OPEN Norway
- Olar Portconsult AS
- Oslo Innredning AS
- Oslo Håndverksdestilleri AS
- Oslo Byggrehab AS
- Oslo Minibuss AS
- Oslo Låsservice AS
- Oslo Fasade AS
- Optronics Technology AS
- Oslo Prosjektbygg AS
- On the Spot AS
- Oyama Karate Norge
- Oslo Flerkulturell Forening
- Odd Ivar Sande
- Oyama Karate Norge
- Omer Negib Abdullahi
- Orgelbau Kuhn Ag
- Orgelbau Kuhn Ag
- Oslo Dogwalking-Hundelufting
- Oslo øst Trafikkskole AS
- Osimili Best Trade
- Og Brannsikring AS Prosjekt
- Omron Electronics Norway AS
- OneCo Technologies - Oslo
- Oslo Technical Service AS
- Oppdrift Erik Andreassen
- O K Regnskap A/S
- Oslo Square Management AS
- Ormlia nord Næringspark AS
- On the Track
- Ormlia sør Næringspark AS
- Oslo Renhold Service AS
- Oyatel Fs Test
- Osman Abbas A
- Oslo Elektriker Service AS
- O.J Dahl AS
- Oslo Fasade Murmester AS
- Oris Dental Bryn
- Oslo Bygg Gruppen AS
- Olsberg Roy Andre
- Overaa Erling Leidulv
- Oslo Rør & Sanitær AS
- OK Minilager Alna Syd
- Oslo Thai Yoga Simpson
- Oslo Gjenbruk og Transport AS
- Oslo og Omegn Kjøttfaglaug
- Oslo og Akershus Bandyregion
- Onitio Solutions Norge AS Avd Oslo
- Oslo Barnelegepraksis Vibeke Fossum
- Olaf E Eriksen AS Entreprenørforretning
- Oslo og Viken Trafikkskole AS
- Oslo Glass & Vindu AS
- Oslo Bad & Flis AS
- Oslo Politidistrikt Kriminalteknisk Avsnitt
- Oslo flagg og fane
- Olsen Restaurant & Bar
- OK Minilager Alna Øst
- Ole Deviks vei 30 Atelierfellesskap
- Osimili Best Trade & Transport
- Oslo og Akershus Regionale Bedriftsidrettslag
- Odegård Design Kine Kittelsen Ødegård
- Oslo og Akershus Regionale Bedriftsidrettslag
- Oslo Minibuss, Trond O. Ellingsvold
- Oslo Port og Industriservice Harald Knudsen
- Ola Normanns Musikk Anne Ragnhild Trondsgård Leren
- Oneco Elektro AS Avd Ole Deviks vei 6b Oslo
- Over Stokke og Stein Børge Stokke Nikolaisen