| Name | Country | Market Cap (US$) |
|---|
| O2 Communications (Ireland) Limited | Republic of Ireland | Private |
| Oasis Imaging Products Inc | United States | Private |
| Océ (Schweiz) AG | Switzerland | Private |
| OCOEE Holdings | Hong Kong | Private |
| OCONNORS ENGRG & TRDG (M) SDN BHD | Malaysia | Private |
| ODEM ELECTRONIC TECHNOLOGIES 1992 LTD. | Israel | Private |
| Odu-Steckverbindungssysteme Gmbh & Co. Kg | Germany | Private |
| OEM Finland Oy | Finland | Private |
| Ohnishi Denki (HK) Limited | Hong Kong | Private |
| Ohtori Hong Kong Limited | Hong Kong | Private |
| OKAYA ELECTRONICS CORP. | Japan | Private |
| OKI Electronics (Hong Kong) Limited | Hong Kong | Private |
| OKI SISTEMS ITALIA SPA | Italy | Private |
| OMAN INTERNATIONAL ELECTRONICS & TRADING COMPANY LLC | Oman | Private |
| OMNI-Solution Multimedia e. K. | Germany | Private |
| Omnilogic Telecomunicaciones, S.A. | Spain | Private |
| Omnitech Holdings Limited | Hong Kong | Private |
| OMRON ASIA PACIFIC PTE LTD | Singapore | Private |
| Omron Canada Inc | Canada | Private |
| Omron Electronic Components (Hong Kong) Limited | Hong Kong | Private |
| Omron Electronics (Hong Kong) Limited | Hong Kong | Private |
| Omron Electronics GmbH | Germany | Private |
| OMRON ELECTRONICS IBERIA SA | Spain | Private |
| OMRON ELECTRONICS LTD | United Kingdom | Private |
| Omron Electronics Oy | Finland | Private |
| OMRON ELECTRONICS PTE LTD | Singapore | Private |
| OMRON ELECTRONICS SPA | Italy | Private |
| One For All GmbH | Germany | Private |
| Online Enterprises, Inc | United States | Private |
| Onpress Printed Circuits Limited | Hong Kong | Private |
| Opal Telecom Ltd | United Kingdom | Private |
| Optex (H.K.) Limited | Hong Kong | Private |
| Opti-Com Manufacturing Network, Inc | United States | Private |
| Optimal Telecom Sverige AB | Sweden | Private |
| OPTREX DISPLAY SINGAPORE PTE LTD | Singapore | Private |
| Optus, Inc | United States | Private |
| ORANGE CELLULAR SERVICES | United Kingdom | Private |
| Orange SA | France | Private |
| Orbis Oy | Finland | Private |
| Orbita (HK) Limited | Hong Kong | Private |
| Orbotech Inc | United States | Private |
| OREGON SCIENTIFIC (U.K.) LTD | United Kingdom | Private |
| Oregon Scientific Global Distribution Limited | Hong Kong | Private |
| OREGON SCIENTIFIC ITALIA S.P.A. | Italy | Private |
| Orient Power GPS Limited | Hong Kong | Private |
| Oriental Printed Circuits Limited | Hong Kong | Private |
| ORION ELECTRIC MANUFACTURERS (SINGAPORE) PTE. LTD. | Singapore | Private |
| Ortel Corporation | United States | Private |
| OS ELECTRONICS CO.,LTD. | Japan | Private |
| Osbern Sales Company | United States | Private |
| OSRAM Lighting Control Systems Limited | Hong Kong | Private |
| OTORI ELECTRONICS CORP. | Japan | Private |
| Otto Fischer AG | Switzerland | Private |
| Out now Uwe Broich Handels GmbH | Germany | Private |
| Oy Atlas Copco Ab | Finland | Private |
| Oy Atlas Copco Kompressorit Ab | Finland | Private |
| Oy Ekström Ab | Finland | Private |
| Oy Esab | Finland | Private |
| Oy Etra Ab | Finland | Private |
| Oy Grönblom Ab | Finland | Private |
| Oy Hedengren Ab | Finland | Private |
| Oy L M Ericsson Ab | Finland | Private |
| Oy Mechelin Company Ab | Finland | Private |
| Oy Rolac Ab | Finland | Private |
| Oy Sauer-Danfoss Ab | Finland | Private |
| Oy Tecalemit Ab | Finland | Private |
| P H Cellular Inc | United States | Private |
| P I Manufacturing Corp | United States | Private |
| P. & R. ELECTRICAL WHOLESALERS PTY. LTD. | Australia | Private |
| P.A.C. Trading Group, Inc. | United States | Private |
| P.C.H. INTERNATIONAL LTD | Republic of Ireland | Private |
| P.N. Electronic Limited | Hong Kong | Private |
| P.P.TV - PUBLICIDADE DE PORTUGAL E TELEVISAO, S.A. | Portugal | Private |
| P.S.I. (HK) Ltd | Hong Kong | Private |
| P.T. Telekomunikasi Selular | Indonesia | Private |
| PAC Trading Company Limited | Hong Kong | Private |
| PACER COMPONENTS PLC | United Kingdom | Private |
| Pacific Crown Industrial Limited | Hong Kong | Private |
| PAGE GROUP LTD | United Kingdom | Private |
| Pakistan Mobile Communications Limited | Pakistan | Private |
| Paladin Security Systems Ltd | Canada | Private |
| Palisades Tvc Holding, Llc | United States | Private |
| Palm Electronics Manufacturing Corp. | United States | Private |
| PALSON TRADING ESPANA S. L. | Spain | Private |
| Panasonic AVC Networks Slovakia s.r.o. | Slovakia | Private |
| Panasonic Eastern Europe Handelsgesellschaft mbH. | Austria | Private |
| Panasonic Electric Works (Hong Kong) Co. Limited | Hong Kong | Private |
| Panasonic Electronic Devices (Hong Kong) Co., Limited | Hong Kong | Private |
| Panasonic Industrial (Shenzhen) Co., Ltd | China | Private |
| PANASONIC INDUSTRIAL ASIA PTE LTD | Singapore | Private |
| Panasonic Industrial Europe GmbH | Germany | Private |
| PANASONIC INDUSTRY SALES CO.,LTD. | Japan | Private |
| Panasonic International Trading (Shanghai) Co.,Ltd. | China | Private |
| PANASONIC LOGISTICS CO U K LTD | United Kingdom | Private |
| PAPISTAS EMPORIKI S.A. | Greece | Private |
| PARAGON ELECTRONIC COMPONENTS PLC | United Kingdom | Private |
| Pcg Trading, Llc | United States | Private |
| Peerless Electronics Inc | United States | Private |
| Pegasus Telecom (Hong Kong) Company Limited | Hong Kong | Private |
| Pei-Genesis Inc | United States | Private |
|
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