- Ambit Design Systems, Inc.
- AMIQ EDA
- Amkor Technology
- AMS AG
- Anacad Electrical Engineering Software GmbH
- Anagram Inc.
- Analog Bits Inc.
- Analog Design Automation, Inc.
- Analog Design Tools Inc.
- Analogy Inc.
- Anasim
- Andes Technology
- Andes Technology Corp.
- Ansys
- Antares
- Antrim Design Systems Inc.
- Apache Design Solutions, Inc.
- Apical Ltd.
- APLAC Solutions Corp.
- Aplus Design Technologies Inc.
- Applied Materials, Inc.
- Applied Simulation Technology
- Applied Wave Research, Inc.
- Apres Technologies
- Apteq Design Systems Inc.
- Aptix Corporation
- Arasan Chip Systems
- ARC International PLC
- Arcad SA
- Arcadia Innovation, Inc.
- Archer Systems
- ArchPro Design Automation, Inc.
- ArcSys Inc.
- Arexsys S.A.
- Argon Design Ltd.
- Aristo Technology, Inc.
- Arithmatica
- Arium
- Arkos Design Systems
- Arkos Emulation Unit
- Arm
- ARM SoC Designer
- Arrow Devices Pvt. Ltd.
- ARS Microsystems Ltd.
- Arteris
- Artisan Components, Inc.
- ASE (Advanced Semiconductor Engineering)
- ASML
- Aspec Technology Inc
- ASSET InterTech
