- ASTORIA
- Asus
- AT&T
- Atag
- Ateca
- Atlantic
- Atlantis Land
- ATLINKS
- Audemars Piguet
- Audi
- Audio-Technica
- AUDIOLINE
- audiophony
- Audiovox
- Auriol
- AUSTRALIAN MONITOR
- Autel
- Autodesk
- Auvisio
- Avanquest
- Avast
- Avaya
- Avdel
- Avea
- Avent
- AVF
- AVG
- Avid
- Avid Digidesign
- Avid Interplay
- Avid M-Audio
- Avid MediaCentral
- Avid Pinnacle
- Avintage
- Avio
- AVIRA
- Avision
- Axxion
- AYA
- AYP