Bedrift O - Søreidgrend
- Oppstandelseskirken
- Oltek AS
- Oltek AS
- Oen AS
- Opsasec AS
- Oldstein AS
- Oan AS
- Oslo Froskemannsklubb
- Oslo Fit AS
- Olav Søreide AS
- Og Skar AS
- Oeberge Invest AS
- Oldereid Consulting
- Oppedal Godvilje
- Orhan Aliev
- Orion bygg AS
- Opsahl Consulting
- Odc Invest AS
- Oen Invest AS
- Oisann Engineering AS
- Olav Søreide Fysioterapi
- Ole Torrissen Holding AS
- Oddvin Hornnes Konsulentbyrå AS
- On Off Eiendom AS
- Områdeutvalget for Søreide
- Ortopedi Spesialist Varkey
- Orbit Asgedom Transport
- Ove Martin Grimstad
- Obsidian Produksjoner SA
- Oü Builder & Joilie
- Okbeso Transport Ukbamichael Mebrahtu Kifle
- Opplæring og IT Konsult Jan Rune Fossheim