Bedrift O - Haslum
- Omjykon AS
- Omizan AS
- Otoryx AS
- Omizan AS
- Offbeat Entertainment DA
- Olena Kolesnik
- Olha Klienina
- Olga Dargevicus
- Ottesen Consulting
- Oda Roth
- Olsen Lb
- Onn Saadat
- Oscar Chandler
- Olsens Hager
- Ojah Invest AS
- Olafsdottir Katrin
- Oppussing Ekspress AS
- Omland Investments AS
- Ofm Holding AS
- Object Production AS
- Olav Leden Nytrøen
- Ole Morten Finstad
- Odd Jørund Buøen
- O.Brekken Consult
- Overlege Langbergs Familielegat
- Olsen & Kristensen Ltd
- Oslo Data Consulting AS
- Out Of Bounds AS
- Ohn 707 Holding AS
- Ole Morten Finstad
- Oktawian Franciszek Mudlaff
- Oscar Alvestad Harboe Musikk
- Odden, Svia og Ormevika Veilag
- One Renhold Monika Karolina Serafin