Bedrift O - Klæbu
- Othea ANS
- Oversand
- Ola Bjørklimark
- Ole Holten
- Oshaug Maskinservice
- Offroad Trøndelag
- Ola Bjørklimark
- Ole Tellugen
- Olav Lium
- O. Haugrønning AS
- Oldervik Investment AS
- Olav Aune
- Oldervik Eiendom AS
- Osman Taxidrift AS
- Ola Buan Grendstad
- Oliver Olsvik Utleie
- Oshaug El -Support
- Ole Roar Grendstad
- Oddrun Agnes Bostad
- Osman Jama Elmi
- Oldren Salg og Tjenester
- Olehns Catering Anita Skogland Olsen