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| Acra Electric | Acrosser USA | ACS Motion Control |
| ACT Fastening Solutions | Actel | Action Instruments/Eurotherm |
| Activa | Actron Manufacturing | Acute Power/International Coil |
| Adalet | Adam Tech | Adaptec |
| Adapters Plus | ADC Telecommunications | Adchem |
| ADDA | Adel Tool | Adel Wiggins Group |
| Adels-Contact | ADI Electronics | ADIC |
| Adirondack Wire & Cable/Whitney | Adiva Technology | ADL Insulflex |
| Adler | Adtran | Adtron |
| Advance Controls | Advance Transformer | Advanced Connectek |
| Advanced Crystal Technology (ACT) | Advanced Digital Cable | Advanced Electronic Support Products |
| Advanced Illumination | Advanced Instruments | Advanced Interconnections Corp. |
| Advanced Linear Devices | Advanced Materials | Advanced Micro Devices (AMD) (Also see Spansion) |
| Advanced Micro Lites | Advanced Motion Controls | Advanced Photonix |
| Advanced Power Solutions | Advanced Semiconductor | Advanced Technology Video |
| Advanced Test Products | Advanced Thermal Solutions | Advantech America |
| Advantech Automation | Advantech Embedded Computing | AEG Industrial Controls |
| AEI Manufacturing | AEM Inc. | AEMC Instruments/Chauvin Arnoux |
| Aero Power Technology | Aero-Electric Connector | AeroComm |
| Aeroflex Circuit Technology | Aeroflex/Inmet | Aeroflex/KDI Resistor Products |
| Aeroflex/Metelics | Aeroflex/Weinschel | Aeroquip/Engineered Sys. Grp. |
| Aerospace Nylok | Aerospace Wire | Aerovox |
| Aesops |
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