| 01 Solutions | Attica |
| 100mentors | Attica |
| 1Host.gr | Attica |
| 30 Seconds of Code | |
| 3ds webdesign & multimedia | Central Macedonia |
| 3p S.A. | |
| 3S Trading | |
| 4M | Attica |
| @Shop | |
| A-Office | |
| Aboutnet | Attica |
| ABOVE Digital | |
| AbZorba Games P.C. | Attica |
| Accepted Ltd | |
| Access-Database | Attica |
| AccessLab IT Services | |
| AccessPoint Computers | Attica |
| Accouting Solutions | |
| ACE Hellas | Attica |
| ACT S.A. | |
| Action Finance Initiative | |
| Action PC | |
| Adaptera | |
| Addicted | Attica |
| ADK - Consulting Engineers S.A. | |
| Advecom | Attica |
| Aegean Balti Bank | |
| Aentep S.A. | |
| Afternet | |
| Afterzed | Attica |
| Agricultural University of Athens | |
| AgroApps | |
| Agroinvest S.A. | |
| Alba Graduate Business School | Attica |
| Alexis Petrounias | Attica |
| Alfa Institute of Biomedical Sciences | |
| Alfanet | Attica |
| Alfaware A.E. | |
| allVoIP | Attica |
| Allweb Solutions S.A. | |
| Alma Technologies S.A. | Attica |
| Altnet | Attica |
| Amaze | Attica |
| AMD Telecom S.A. | Attica |
| American College of Greece | |
| American College of Thessaloniki | Central Macedonia |
| Amplus S.A. | |
| Anadelta Software | Attica |
| Anazitisi Online | Attica |
| Angellight Services Ltd | Attica |