- Arrow Electronics
- Art Biesenthal
- Art of Touring
- Arup
- Arvato Bertelsmann
- Ärzte der Welt
- Asana Rebel
- Ascari s.r.o.
- Ascom
- ASDA
- Ashurst
- Asics
- ASM International
- ASML
- ASOS.com
- ASSA ABLOY
- at&t
- Atheneum Partners GmbH
- Atkins
- Atlas Copco
- Atlassian
- Atos IT Solutions and Services
- audibene GmbH
- audio content & control GmbH
- Aurora Energy Research Limited
- Aurubis
- Auto1.com
- Autobutler
- Autodesk
- Autohaus Brodmann
- Autoliv
- Automatic Data Processing
- Automatic Vision Technologies GmbH
- Automations Anywhere
- Autotask
- AutoUncle
- Auxmoney
- AvalancheJob
- avaloq group
- Avanade
- Avantgarde Experts
- Avast
- Avaya
- AVG Technologies
- Avient
- Avis Budget Group
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