Brands
- +GF+ Signet
- AA Inc
- AAA-ACME
- Aaliant Fluid Measurement Solutions
- Abaco
- ABB
- ABM
- ABSOPULSE
- AC & R Components
- AC Tech
- AC Technology
- Accu-Fab
- Accu-Sort
- AccuWeb
- ACDC
- acdc electronics
- Achem
- ACI
- Aclara
- Acme
- Acme Electric
- ACME Electric Corporation
- Acme Transformer
- Acopian
- Acromag
- ACS
- ACT
- Action Instruments
- Active Power
- ActivePower
- Adalet
- Adaptabel
- Adaptive
- ADDA
- Adept
- ADEPT TECH
- ADMMICRO
- ADS Corporation
- ADT Alarm Systems
- ADTECH
- AdTran
- Advance
- Advanced Micro Controls
- Advanced Motion Controls
- Advantage Electronics
- Advantech
- Aearo
- AEC
- AEG
- AEMC
- Aerosonic
- Aerovox
- Aerovox Mallory
- AFP Transformers
- Agastat
- AGM
- Air Filters, Inc
- Air Mite
- Air Monitor Corporation
- Airpax
- Airpot
- Ajax
- Ajax Manethermic
- Ajax Tocco Magnethermic
- Ajax Transformer Co
- AlberCorp
- Alcad Ltd
- Alcatel Lucent
- Alco Controls
- Alfa Laval
- All Tex
- Allen Bradley
- Allen-Bradley
- Allen-Bradley Rockwell Automation
- Allied Telesis
- Alling-Lander
- Allis Chalmers
- Allis-Chalmers
- Alpha
- Alpha Security
- Altronic
- Amadori
- Ambitech
- AMCi
- American
- American Battery Charging
- American Maplan
- American Power Conversion
- American Torch Tip
- Ametek
- Amick Associates
- AMP
- Amphenol
- AMT
- Amtek
- amtelco
- Analogic
- Anderson
- Anderson Greenwood
- Andover Controls