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O.N. Producciones Creativas (Obra Negra)
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Onsemi
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ON Semiconductor Corporation
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Onsite Central Limited
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Ontario Hyundai
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Ontario Partners
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Ontario Power Generation (OPG)
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Ontario Teachers' Pension Fund
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Ontex Group NV
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On the Beach Group plc
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Ontide
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ONtv
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Onur
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Onward Holdings
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Onyx (part of Veolia Environnement)
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Oocl Logistics (Europe) Limited
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OOO Dal'TeploEnergo
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Ooo NPGF Regis
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OOO Stroitel (owned by Elitkompleks)
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Ooredoo
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Oosto (formerly AnyVision)
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Opal
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OPASS Distribution Ltd
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OP Chocolate Ltd