A
- AAEON UP
- AATC
- Aavid
- ABB
- ABLIC
- ABRACON
- Acconeer
- ACEINNA
- Adafruit
- ADDA
- ADI Trinamic
- ADLINK Technology
- Advanced Energy
- Advanced Energy / Artesyn
- Advanced Energy / Excelsys
- Advanced Energy / TEGAM
- Advanced Energy / Ultravolt
- Advanced Linear Devices
- Advanced Photonix
- Advanced Semiconductor, Inc.
- Advanced Thermal Solutions
- Advantech
- Afero
- AIM
- AirBorn
- Airgain
- Allegro MicroSystems
- Alliance Memory
- Alorium
- Alpha (Taiwan)
- Alpha Wire
- Alps Alpine
- Alt Shift
- Altech
- Altitude Tech
- Ametherm
- Amphenol
- Amphenol / SV Microwave
- Amphenol Aerospace
- Amphenol Air LB France
- Amphenol All Sensors
- Amphenol Commercial Products
- Amphenol FCI
- Amphenol Industrial
- Amphenol LTD
- Amphenol Pcd
- Amphenol ProLabs
- Amphenol RF
- AMSECO
- Amulet Technologies
- Analog Devices
- Analog Devices / Maxim Integrated
- Anaren
- ANAVI Technology
- Anderson Power Products
- Andes Technology
- Antenova
- AP Memory
- Apacer
- Apem
- Apex Microtechnology
- Apex Tool Group
- APM HEXSEAL
- Apogee Semiconductor
- Applied Motion
- Aptiv (formerly Delphi)
- Arbor Technology
- Arduino
- ArduSimple
- Aries Electronics
- Asahi Kasei Microdevices
- Astrocast
- Astrodyne TDI
- ATC Automatic Timing & Controls
- ATC Diversified Electronics
- ATLAS
- Atmosic Technologies
- ATOP
- ATP Electronics
- Auer Signal
- Auvidea
- Avalanche Technology
- Aven
- Avery Dennison
- Axiomtek
- Azoteq
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