| Company Name | Country |
|---|---|
| Omeros Ireland Limited | Ireland |
| Omnicin Therapeutics B.V. | Netherlands |
| Omnidos P.S.A. | Poland |
| ONCO-EUROPE Kft. | Hungary |
| Oncoheroes Biosciences S.L. | Spain |
| Oncoinvent AS | Norway |
| OncoNano Medicine Limited | Ireland |
| Onconova Europe GmbH | Germany |
| Oncopeptides AB | Sweden |
| Oncoradiomics S.A. | Belgium |
| Oncoral Pharma ApS | Denmark |
| Oncorena AB | Sweden |
| Oncoscience GmbH | Germany |
| Oncostellae S.L. | Spain |
| Oncovita | France |
| OncoZenge AB | Sweden |
| One-carbon Therapeutics | Sweden |
| OneChain Immunotherapeutics, S.L. | Spain |
| Oniria Therapeutics S.L. | Spain |
| ONK Therapeutics Limited | Ireland |
| Onkogen Kft. | Hungary |
| onkovis GmbH | Germany |
| Onni Biotechnologies Oy | Finland |
| OP Pharma S.R.L. | Italy |
| Op2Lysis | France |
| OPERON, S.A. | Spain |
| OPK Biotech Netherlands BV | Netherlands |
| Optimal Regulatory Solutions, S.L.U. | Spain |
| Opus Materia Ltd | Greece |
| ORBIT PHARMA LIMITED | Ireland |
| Orchard Therapeutics Netherlands B.V. | Netherlands |
| Oresund Pharma ApS | Denmark |
| Orexa B.V. | Netherlands |
| ORKEO | France |
| Orphalan | France |
| ORPHELIA Pharma | France |
| Orphelion AB | Sweden |
| Orphix Consulting GmbH | Germany |
| ORYX GmbH & Co. KG | Germany |
| Oryzon Genomics, S.A. | Spain |
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