| Company Name | Country |
|---|---|
| Omeros Ireland Limited | Ireland |
| Omet Pharma AB | Sweden |
| Omnicin Therapeutics BV | Netherlands |
| OmniSpirant Limited | Ireland |
| Ona Therapeutics | Spain |
| ONCO-EUROPE Kft. | Hungary |
| Oncodesign Precision Medicine | France |
| Oncoelectronics SAS | France |
| Oncoheroes Biosciences Europe, S.L. | Spain |
| Oncoinvent AS | Norway |
| OncoLize B.V. | Netherlands |
| Oncopeptides AB (publ) | Sweden |
| Oncoral Pharma ApS | Denmark |
| Oncorena AB | Sweden |
| 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 |
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