Bedrift O - Ranheim
- Oceandrive AS
- Omi AS
- Othmans
- Obsidian AS
- Optilås AS
- Othman
- Oceanex AS
- Olaf Husby
- Oryx Holding AS
- Ohana Holding AS
- Oma Musikk
- Ok Invest AS
- Oterhals Tor
- Ole Storø
- Oliinyic Nozarii
- Opphaug Holding AS
- Olsen Sanitet
- Oda Tafjord
- Oyne Holding AS
- Odins Eiendom AS
- Oscar Garvin
- Optimal Bevegelse AS
- Olderdalstunet Sameie
- Olderdalen Skotthyllklubb
- Overvik Eiendom AS
- Olderdalen Velforening
- Office Partner AS
- Olderdalstunet Sameie
- Olderdalstunet Velforening
- Ottante Cosmetics Norge ANS
- Ove Reitan Transport AS
- Obitnes Øystein Bitnes
- Olsen Hilde Grimnes
- Offshore Health Services AS
- Odin Melgård Tanem
- Olav Sigurd Sandvik
- Odd Martin Harper
- Olderøy nord Bryggeeierlag
- Oksvold Dag Erik
- Olderøy nord Bryggeeierlag
- Olderdalen Posten Pakkeutlevering
- Onitio Solutions Norge AS Avd Trondheim
- Orientalsk Dans V/Nina Wilhelmsen
- Oddvar I. N. Daren
- Omar M-B Sheikh-Awad
- Og Brit Hellem Haugen Jon Haugen