Bedrift O - Hauketo
- Olivenfilm ANS
- Omicon AS
- Oksvold
- Onlinept Willoch
- Oslo Videokopi
- Oslo Sportsdykkeklubb
- Oslo Trefelling
- Omar Transport
- Oystein Jacobsen
- Oppussingmalingteam Ciade
- Oslo Byggfornying DA
- Osmani Sgc
- Ofstad Eiendomsservice
- Oldtidshagen Parsellhagegruppe
- Oldtidshagen Parsellhagegruppe
- Oxana Llchuk
- Oslo Takstkontor AS
- Oslo Bilformidling AS
- Oslo Auto AS
- Omer Suqlain Raja
- Odd-Arild Nordlie
- Oslo Strings Samvirkeforetak
- Omar Ahmed Raage
- Oslo Consulting Ali
- Oslo Sámiid Duodji
- Oslo Sámiid Duodji
- Oslos Taxi Shawahna
- Ole Hegle Sjøflot
- OK Minilager Hauketo
- Oslo Universitetssykehus HF Ambulansetjenester Prinsdal
- Ole Morten Goplerud Øveren
- Oppussing Team Ioannis Tzimas
- O-E-P Kleberg
- Oslo International Family Church
- Oslo International Family Church
- Oslo syd Trafikkskole Holmlia AS
- Oslo Taxi Jaswinder Singh Mahal
- Omega Miljo Service Izi Omoju