• O.P. Pharma S.R.L.
• Octapharma Ab
• Octapharma S.A.
• Oiarso Sociedad Cooperativa
• Olpha As
• Omnivision Gmbh
• Oncopeptides Ab
• Opella Healthcare Spain S.L.
• Opko Health Spain S.L.U.
• Orchard Therapeutics (Netherlands) B.V.
• Organon N.V.
• Organon Salud S.L.
• Orion Corporation
• Orpha-Devel Handels Und Vertriebs Gmbh
• Orphalan
• Otsuka Novel Products Gmbh
• Otsuka Pharmaceutical Netherlands B.V.
• Oxigen Salud S.A.
• Oxipharma S.L.