Bedrift O - Stabekk
- Odellon
- Odellon
- Oilno DA
- Oslotorgetno DA
- Oppover AS
- Oakway AS
- Oda Sjøvaag
- Oslofjorden Vannsport
- Onomatopoietikon Julvisper DA
- Orakel Assistent DA
- Oslofjorden Vannsport
- Optiker Brillemann DA
- Olga Kalamanova
- Otac Management AS
- Often Holding AS
- Oliveira Svoren AS
- Op Arnesen AS
- Osplund Consulting AS
- Object nord AS
- Oksana Korola
- Olaussen Company
- Open Solutions AS
- Orca Vekst AS
- Olstad Media
- Omsveen Eiendomstjenester
- Oer Consulting AS
- Olav Gunnheim
- Ohm Eiendom AS
- Osen Invest AS
- Ohm Næringsbygg AS
- O-Hoi AS
- Olmastam Invest AS
- Oer Consulting AS
- Openmind Geoservice AS
- Ots Invest AS
- Oak Garden AS
- Omg Holding AS
- Ord og Erotikk DA
- Oslo First Antikviteter DA
- Oslo Skole Names DA
- Ole for Top100 DA
- Oslo Lordag Trip DA
- Old for Top10 DA
- Oslo Vandrerhjem Holtekilen
- Olav Larsen Halleraker
- Ole Martin Skaug
- O H Consulting AS
- O`neill Kevin James
- Omsøm Astrid Gjerde
- Oslo Flight Academy AS
- Oslo Flight Academy AS
- O.B.Børter AS
- Ove Berg Consulting
- Olivia Grace Gladstone
- Olena Mitusova (Enk)
- Oslo Netball Club
- Orion Renhold Tawfik
- Oppussingservice Lyjak Slawomir
- Oslo Netball Club
- Ocean Capital Advisers AS
- Offshore Engineering Services AS
- O. Trovatn Invest AS
- Oliwia Katarzyna Ilcewicz
- Olsen Skytetrening & Foredrag
- Oslo Moter og Olje DA
- Oslo Elske & Helseklinikken DA
- Oslo Advokat og Inntekt DA
- Oslo Virus og Bakterier DA
- Oslo & Omegn Optikere DA
- Oslo Hi Hostel Holtekilen
- Oftedahl Apiaku Lars Christoffer
- Ole Martin Jørgensen Invest AS
- Offer-Ohlsen Grete Johanne
- Ospix Tanya S Wallin
- Ole Andreas Laache Klevan
- Ole Cudrios gate 25 AS
- Oslo Joystick And Games Too DA
- Oslofjord Folkehøgskole / Hostel Oslofjord
- Ola Frøysaa Bygg og Tømmermester AS
- One Drop Consult Trude Jacobsen
- Opplevelser for Livet Kay Morten Myrbekk
- Oslo Dee Jay Taxi Abdul Rahman
- Oslo Bygg og Restaurering Marius Sciukas