| Anodos Logistics Ltd | |
| Anova Consulting | Attica |
| Answer Computer Applications | Attica |
| Antinoos Software Applications | Attica |
| Antithesis Group | Attica |
| Apogee Information Systems | Central Macedonia |
| Apopsinet | Attica |
| AppArt | |
| Applicality | Attica |
| Apptiva | |
| Aratos Space | |
| Aresti Power | |
| Arion Software | Attica |
| Aristotle University of Thessaloniki - AIIA Laboratory | |
| Aristotle University School of Medicine | |
| AroundWeb Ltd | |
| Artemis ITS | Attica |
| Artificial Spirit | Central Macedonia |
| Artionweb Design | Attica |
| Artoo | Central Macedonia |
| ASPiSYS Ltd | Attica |
| Association of Hellenic Internet Users | Attica |
| ATC S.A. | Attica |
| Atcom S.A. | Attica |
| Athena-Research and Innovation Center in Information, Communication and Knowledge Technologies | Attica |
| Athens Center for Entrepreneurship and Innovation | |
| Athens University of Economics and Business - Athens Center for Entrepreneurship and Innovation | Attica |
| Athens University of Economics and Business - Department of Informatics | Attica |
| Athens Wireless Metropolitan Network | Attica |
| Atlas Digital | Attica |
| Atnet Communications A.E. | Attica |
| Atomic Orange | Attica |
| Attenzo | Attica |
| AttenzoSMS | Attica |
| Attica Bank | Attica |
| Attica Ventures | Attica |
| Authorwave Creations | Attica |
| Aventurine | |
| Aventurine S.A. | Attica |
| Away.gr | |
| B-Tech | East Macedonia and Thrace |
| Bakis Electronics | Attica |
| Bakis Electronics Ltd | Attica |
| Bank of Greece | Attica |
| Bcash | |
| Beat | |
| Beyond Software Solutions S.A. | |
| Big Pi Ventures | |
| bioAxess | |
| Biomedical Research Foundation Academy of Athens | |