- ABM Info Tech [Islamabad]
- ALgorithms for coMmunicAtion SecuriTY
- ATMEL Secure Microcontroller Solutions, Zone Industrielle
- ATOS Origin
- ATOS [Barcelona]
- ATOS [madrid]
- Aalborg University [Denmark]
- Aalto University
- Abdus Salam International Centre for Theoretical Physics [Trieste]
- Abertay University
- Absa Capital [Johannesburg]
- Academy for Information Technology [University of Johannesburg]
- Academy of Equipment [Beijing]
- Accenture Technology Consulting - Security
- Accenture [Arlington, Virginia]
- Accenture [Oslo]
- Adams 12 Five Star Schools
- Adana Science and Technology University
- Adastral Park
- Advanced Signal Processing Group
- Advanced Technology Institute [Bucarest]
- Agence nationale de la sécurité des systèmes d'information
- Agency for science, technology and research [Singapore]
- Agenzia Nazionale per le nuove Tecnologie, l’energia e lo sviluppo economico sostenibile = Italian National Agency for New Technologies, Energy and Sustainable Economic Development
- Aichi Institute of Technology
- Air Force Institute of Technology
- Air Force Research Laboratory
- Air France KLM
- Aix Marseille Université
- Ajou University
- Albert-Ludwigs-Universität Freiburg = University of Freiburg
- Alexandra Institute [Aarhus]
- Algorithmes, Programmes et Résolution
- Algorithms for Dynamic Dependable Systems
- Alliance Manchester Business School
- Alm. Brand
- Alma Mater Studiorum Università di Bologna = University of Bologna
- Almaarefa College
- Alpen-Adria-Universität Klagenfurt [Klagenfurt, Austria]
- Amazon
- AnalyzeData
- Applied Communication Sciences [Basking Ridge, NJ]
- Appthority [San Francisco]
- Architecture, Cloud continuum, formal Models, artificial intElligence and Services in distributed computing
- Archon Information Systems
- Arizona State University [Tempe]
- Artificial Intelligence Research Institute [South Korea]
- Asia University
- Aston University [Birmingham]
- Atal Bihari Vajpayee-Indian Institute of Information Technology and Management [Gwalior]
- Atea Sverige AB
- Athens Technology Center S.A. [Athènes]
- Athens University of Economics and Business
- Auckland University of Technology
- Australian Cyber Security Centre
- Australian Federal Police
- Australian Government
- Australian National University
- Austrian Academy of Sciences
- Austrian Institute of Technology [Klagenfurt]
- Austrian Institute of Technology [Vienna]
- Auteur indépendant
- Authentication Industries [Montpellier]