| Arena Capital Partners | Dublin City Council |
| AREX European Market Ltd | |
| Arkaon Ltd | Dublin City Council |
| ARL Design | Cork City Council |
| Armac Systems | |
| Armour Interactive Ltd | Galway City Council |
| Arralis Ltd | Limerick City and County Council |
| Arrow Enterprise Computing Solutions Ltd | |
| Artefact | |
| Artweb | Dublin City Council |
| Aryza Ltd | |
| Asavie | Dublin City Council |
| Ash Technologies Ltd | Kildare County Council |
| Ashling | Limerick City and County Council |
| Aspira | |
| Aspire Marketing Consultants | |
| Aspire Technology | |
| Asterisk Consultants | Dún Laoghaire-Rathdown County Council |
| Asystec | |
| Athlone Institute of Technology | Westmeath County Council |
| Atlantic Linux | Galway City Council |
| Atlas Aerospace | |
| Atlas Aerospace | |
| Atlas Computers Ltd | South Dublin County Council |
| Atollon Ireland Ltd | Dublin City Council |
| Attitude Technologies | |
| Aura Internet Services Ltd | Monaghan County Council |
| Aurigen Medical Ltd | |
| Aurora Telecom | |
| Auto Repair Bill Software Solutions Ltd | |
| Autoaddress.ie | Dublin City Council |
| Automated Intelligence | |
| Automation Direct Ltd | Dublin City Council |
| Automsoft International Ltd | Dublin City Council |
| Avadel Pharmaceuticals plc | |
| Avectas | |
| Avena | Cork County Council |
| Aviate Systems | |
| Avolon | |
| Avvio | Limerick City and County Council |
| AxisBic | |
| Axonista | |
| AxonWare Ltd | Dublin City Council |
| Aylien Ltd | Dublin City Council |
| Azotel Technologies | Cork City Council |
| BackupVault | Dún Laoghaire-Rathdown County Council |
| Bad Wolf Software | Kildare County Council |
| Baker Security & Networks | Dublin City Council |
| Bamboo | |
| Bandwidth Telecommunications | Dublin City Council |