Bedrift O - Skjetten
- Oecona AS
- Orogenic AS
- Olavsgaard Gruppen AS
- Olavsgaard Næringsbygg AS
- Olav Garlie
- One World AS
- O'Neill Ray
- Onstad Jørn
- Offshore Constructor AS
- Olavsgaard Næringspark AS
- OBO Bettermann
- Oslo Høytrykksvask AS
- Oslo Rides AS
- Opas Kreditt AS
- Oslo Automatgear AS
- Olavsgaard Eiendom AS
- Oslo Markise AS
- Outsearching.Com AS
- Oslo Overflateteknikk AS
- OBRON Sørøst
- Olufsen Selvhjelpsteknikker
- Osan Consulting
- Olavsgaard Drift AS
- Olavsgaard Hotell Eiendom AS
- Otto Olsen Eiendom AS
- Olav Morten Haug
- Oslo Transport Iqbal
- Otto Olsen Skipsinvest AS
- Otto Olsen Boligutvikling AS
- Olimstad Mary Kay
- Ot Media Wanvik
- Opsahl & Osland Miljøkonsult DA
- Onninen Express Hvam, Skjetten
- Omar Said Mohamed Al-Amudi
- Oslo og Akershus Kaninavlsforening
- Olaf Gjesti & Sønn AS
- Oslo Snekker Service Celal Emami
- OBOS Block Watne Viken Nord
- OBOS Block Watne AS Avd Viken nord 26440
- Ole Martin Kolbjørnshus Viser og Vers