Bedrift O - Nøtterøy
- Onzite AS
- Optura AS
- Ottanes AS
- Overdevest
- Onor AS
- Oseberg Tekstilgruppe
- Opptill Sundin
- Olsen Eiendomsservice
- Opplæringskontoret Oktav AS
- Oriental Food AS
- Ola Blom AS
- Optima Design AS
- Ocw Holding AS
- October Design AS
- Oseberg Bolig AS
- Okura Sushi AS
- Oleksandr Ohorodnikov
- Oshaug Randi
- Onkedu Andersen
- Orto Robertsen
- Olsen Toppledelse
- Onzite Digital AS
- Oseberg Solutions AS
- Oseberg Pharma AS
- Olena Bulot
- Oleksii Pidrepnyi
- Optura Distribution AS
- Optura Nordic AS
- Olena Stepenko
- Oksana Klykova
- Olena Dzhaman
- Oseberg Solutions AS
- Oseberg Services AS
- Oliver Moen
- Oh Westby
- Ottestad Bilverksted AS
- Ovi Bygg AS
- Omg Prosjekter AS
- Ormelet Båt AS
- Oddbjørn Hedemark Hansen
- Olav A. Rasting
- Olemj Logistics Jørgenvåg
- Ole Gundersen Holding AS
- Odd Magne Berge
- Olaf B Terjesen AS
- Ole Ferdinand Storn
- Oase Av Sinn AS
- Ole-Martin Bekkevar
- Ole Kr Johansen
- Oyster Heaven Olsen
- Ole S. Haugen
- Ortoped Lars Tony Fevang
- Olaf B. Terjesen Butikk
- Odd Bartho-Hansen & Sønner AS