| Nimi | Paikkakunta |
|---|---|
| OPTER | Tampere |
| OPTIC Finland avoin yhtiö | Tampere |
| Optimum Consulting Oy | Tampere |
| Options for Health Finland | Tampere |
| Optivi | Tampere |
| OptoFidelity Oy | Tampere |
| OptronPak | Tampere |
| oRaakkeli | Tampere |
| Oregano Pizzeria & Kebab | Tampere |
| ORELPUTKI | TAMPERE |
| Organic Health Oy | Tampere |
| Organisaatio-Sanomat Oy | Tampere |
| Orient Trade & Training OY | Tampere |
| Original Arctic | Tampere |
| ORK Media | Tampere |
| Orretech Oy | Tampere |
| Orsmaa | Tampere |
| Osaühing PROTHAX | Tampere |
| OSAKEYHTIÖ K. SIPPOLA | Tampere |
| Osaset.com Oy | Tampere |
| Oscar Software Oy | Tampere |
| Oseir Oy | Tampere |
| OSK Secret Door | Tampere |
| Osk Työhuone Hengari | Tampere |
| Oskar Ali parturi-kampaamo | Tampere |
Yritysesittely