Bedrift O - Hafrsfjord
- Oeeve AS
- Omh AS
- Offspring AS
- Osman
- Orbitx AS
- Olivida AS
- Onergo AS
- Ogu AS
- Oroco AS
- Ordigno AS
- Odelenergy AS
- Omari
- Opusfour AS
- Obar AS
- Ogpro AS
- Omv Masters
- Omv Masters
- Oliversen Jobb
- Olav Jørpeland
- Owe Hernes
- Oskar Pieniak
- Octopus Hellvik AS
- Oblix Invest AS
- Ola Sæbø
- Orudzh Aliev
- Obele Distributions
- Obra Eiendom AS
- Osman Privatundervisning
- Ole Hagen
- O-Fagspatruljen
- Offshore Logistics AS
- Odpsim Zhang
- Olto Invest AS
- Ospeberget Holding AS
- Ottar Barsnes
- Onva Invest AS
- Olga Dubinskaia
- Oma Investment AS
- Oftedal Atelier
- Ove Helgeland
- Opus Eiendomsforvaltning AS
- Ohna - Pedagogisk Kompetanse
- Odd Gunnar Furenes
- Oilfield Drilling Invest AS
- Odd Kjos-Hanssen
- Olav Rolfsen Boligutleie AS
- Ole Nåvik Sund
- Ole Sund Arkitekt
- Oris Dental Madla
- Olsvik Well Construction AS
- Olga Novruzova Magnetic
- Ole Sigbjørn Bratteli
- Ozgul Yagmur Duru
- Ozoglu Topdemir Consulting
- Olsokhagen 8/Olsokveien 41
- Olsokhagen 8/Olsokveien 41
- Olsen Kristin Haugen
- Omer Mohamed Ahmed
- Orzechowska-Niedziela Aleksandra
- Osteopat Ask Kiær Grøsfjeld
- Omar Akram Mohammed Abulaban
- Olsen Anne Gro Gretland
- Oris Dental Martin Stage
- Outline Design Rebecca Rosseland
- Oakenale Joachim Sørensen Erga
- On Board Elise Haugen
- Olsen Raptorphoto Stig Frode
- O. Hesselberg Kurs og Foredrag
- Ortopediske Leddlidelser og Idrettsskader Arthursson
- Oin Sprinkler Odd Inge Nygaard
- Odd Helge Kaada - Arkitekt, Prosjekt- og Byggeledelse