| Nimi | Paikkakunta |
|---|---|
| Ompeluhuone Oxana | Helsinki |
| Ompelukonehuolto Tiainen | Helsinki |
| Omppu Design | Helsinki |
| Omra Hajj Resor Oy | Helsinki |
| Omstart | Helsinki |
| ON MESSAGE | Helsinki |
| On The Move Creative Solutions | Helsinki |
| On The Regular Oy | Helsinki |
| ONBONE OY | Helsinki |
| Once Upon A Time In Fuerte Helsinki | Helsinki |
| Oncos Therapeutics Oy | Helsinki |
| One did it Oy | Helsinki |
| One Entity Oy | Helsinki |
| One Eyed Spirits Holding Oy | Helsinki |
| One House | Helsinki |
| One Plus Three Oy | Helsinki |
| One Thousand Flavours | Helsinki |
| One Up Media | Helsinki |
| One Wheel Ads | Helsinki |
| One-Service Oy | Helsinki |
| One4All Finland Oy | Helsinki |
| OneCompany Consulting Oy | Helsinki |
| OneFrameCinema | Helsinki |
| OneGuest Oy | Helsinki |
| Oneiric Oy | Helsinki |
Yritysesittely