| Company Name [asc] | Country |
|---|---|
| Oncoscience GmbH | Germany |
| Oncostellae S.L. | Spain |
| OncoZenge AB | Sweden |
| One-carbon Therapeutics AB | Sweden |
| OneChain Immunotherapeutics, S.L. | Spain |
| Oniria Therapeutics S.L. | Spain |
| Onkogen Kft. | Hungary |
| Onkovis GmbH | Germany |
| Onni Biotechnologies Oy | Finland |
| OP Pharma SRL | Italy |
| Op2Lysis | France |
| OPERON, S.A. | Spain |
| Optimal Regulatory Solutions, S.L.U. | Spain |
| Opus Materia Ltd | Greece |
| Oranda Therapeutics Limited | Ireland |
| Oresund Pharma ApS | Denmark |
| Orexa B.V. | Netherlands |
| Orfenix BV | Netherlands |
| ORKEO | France |
| ORNYX OÜ | Estonia |
| Orphix Consulting GmbH | Germany |
| ORYX GmbH & Co. KG | Germany |
| Oryzon Genomics, S.A. | Spain |
| OSALIA | France |
| OSE Immunotherapeutics | France |
| OSIVAX | France |
| Osmond Labs AB | Sweden |
| OT4B | France |
| Ouro Medicines Ireland Ltd | Ireland |
| OvoVet Pharma SRL | Romania |
| Oxcia AB | Sweden |
| Oxolife SL | Spain |
| Ozack ApS | Denmark |
| P. Cosmidis & Co EE | Greece |
| P.H.U. Max-Profi Robert Kulbacki | Poland |
| P.T. Hadjigeorgiou & Co Ltd | Cyprus |
| PacingCure B.V. | Netherlands |
| Paesel & Lorei GmbH & Co. KG Biochemika, Diagnostika und Pharzeutika | Germany |
| Palo Biofarma, S.L. | Spain |
| Pan Cancer T B.V | Netherlands |
|
|
|