| Company Name [desc] | Country |
|---|---|
| OPERON, S.A. | Spain |
| Op2Lysis | France |
| OP Pharma SRL | Italy |
| Onni Biotechnologies Oy | Finland |
| onkovis GmbH | Germany |
| Onkogen Kft. | Hungary |
| Oniria Therapeutics S.L. | Spain |
| OneChain Immunotherapeutics, S.L. | Spain |
| One-carbon Therapeutics AB | Sweden |
| OncoZenge AB | Sweden |
| Oncostellae S.L. | Spain |
| Oncoscience GmbH | Germany |
| Oncorena AB | Sweden |
| Oncoral Pharma ApS | Denmark |
| Oncoradiomics S.A. | Belgium |
| Oncopeptides AB (publ) | Sweden |
| Onconova Europe GmbH | Germany |
| OncoNano Medicine Limited | Ireland |
| OncoLize B.V. | Netherlands |
| Oncoinvent AS | Norway |
| Oncoheroes Biosciences S.L. | Spain |
| Oncodesign Precision Medicine | France |
| ONCO-EUROPE Kft. | Hungary |
| Ona Therapeutics | Spain |
| OmniSpirant Limited | Ireland |
| Omnicin Therapeutics B.V. | Netherlands |
| Omet Pharma AB | Sweden |
| Omeros Ireland Limited | Ireland |
| OMEICOS Therapeutics GmbH | Germany |
| Oloker Therapeutics srl | Italy |
| Olikla s.r.o. | Czech Republic |
| Olavide Neuron STX Sociedad Limitada | Spain |
| Oikonomou Aristi-Errieti (trading as Vigi-Care) | Greece |
| OGD2 Pharma | France |
| Odimma Therapeutics | France |
| ODDIFACT | France |
| Oculis ehf. | Iceland |
| Ocugen Limited | Ireland |
| OC Vigilance SL | Spain |
| Oblita Therapeutics bvba | Belgium |
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