| Nimi | Paikkakunta |
|---|---|
| Open Data Standards Association rekisteröimätön | Espoo |
| Open Ocean Capital Oy | Espoo |
| Operzone Oy | Espoo |
| Opetusalan oikeuspalvelu Poutala | Espoo |
| Opinahjo Oy | Espoo |
| OplusMonG design Oy | Espoo |
| OPO Electronics | Espoo |
| Oppifi oy | Espoo |
| OPSICON Oy | Espoo |
| OptFix Services Oy | Espoo |
| OPTIAIR OY | Espoo |
| Optica Holding Oy | Espoo |
| Optica Sello Oy | Espoo |
| Optico Puro Ky | Espoo |
| Optime Solutions Oy | Espoo |
| Optimedia Oy Ltd | Espoo |
| Optiscan Abakus Oy | Espoo |
| Ora Teräs | Espoo |
| Orasmus Ky | Espoo |
| ORCHIDEASHINE | Espoo |
| OrderBid Finland Oy | Espoo |
| Ordos | Espoo |
| Orel Finance Oy | Espoo |
| Organic Sisters Oy | Espoo |
| Orgitecht Consulting Oy | Espoo |
Yritysesittely