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- OEP
- OHMITE
- OK INDUSTRIES
- OK Industries/Div of Jonard Ind Corp
- OK International
- OKI
- OKI Electrical Cable Co Inc
- Oki Semiconductor
- OKI/Metcal
- OKW
- OKW (ENCLOSURES)
- OLIMEX
- Olimex LTD
- Olympic Wire and Cable
- OmniVision Technologies Inc
- OMRON
- Omron Automation and Safety
- OMRON ELECTRONIC COMPONENTS
- Omron Electronics
- Omron Electronics Inc-ECB Div
- Omron Electronics Inc-EMC Div
- Omron Electronics Inc-IA Div
- Omron Industrial
- OMRON INDUSTRIAL AUTOMATION
- OMRON STI
- ON
- ON Semiconductor
- On Shore Technology Inc
- OncQue
- Onset Computer Corp
- Optek
- OPTEK TECHNOLOGY
- OPTO 22
- Opto Diode Corp
- Optrex
- Optrex America Inc
- OPTRONICS
- OPULENT
- Orbitec
- Orion
- ORION FANS
- OSA OPTO LIGHT
- Osram
- OSRAM Opto Semiconductors
- OSRAM Opto Semiconductors Inc
- OSRAM SYLVANIA
- OTTO
- OTTO CONTROLS
- OXLEY
- OEP (OXFORD ELECTRICAL PRODUCTS)
- Okaya Elecotric Industries
- OMC
- Omni Vision
- OMNIMOUNT
- Oshino Lamps
- Otax
- OTHERS
- O.C.WHITE
- Oaks Electronics
- Ocular
- ODU
- Okaya Electric
- Oldaker Mfg.
- Olympic Wire & Cable
- Opnext
- Orange Tags
- OSEPP
- Oslo Switch
- Oupiin America Inc