| Approach People Recruitment | |
| Appuchino | |
| Apridata | |
| Aptiv | Dublin City Council |
| AQ Metrics Ltd | |
| Aquavarra Research Ltd | Dún Laoghaire-Rathdown County Council |
| Aran Biomedical | |
| Archimedia Studios Ltd | Fingal County Council |
| ARD Software | |
| Ardanis | |
| Arekibo | Dublin City Council |
| 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 |
| Arriello Irelant Ltd | |
| Arrow Design | |
| Arrow Enterprise Computing Solutions Ltd | |
| Artefact Ltd | |
| Artemee Web Services | |
| Articulate Digital Business | |
| Aryza Ltd | |
| Asavie | Dublin City Council |
| Ash Technologies Ltd | Kildare County Council |
| Ashley Martin | |
| Ashling | Limerick City and County Council |
| Aspiegel SE | |
| Aspire Marketing Consultants | |
| Aspire Media Ltd | |
| Aspire Technology | |
| Asterisk Consultants | Dún Laoghaire-Rathdown County Council |
| Athlone Institute of Technology | Westmeath County Council |
| Atlantic Linux | Galway City Council |
| Atlas Aerospace | |
| Atlas Computers Ltd | South Dublin County Council |
| Atollon Ireland Ltd | Dublin City Council |
| Attitude Technologies | |
| ATXA Therapeutics Ltd | |
| Aufbau Holdings Ltd | |
| Aura Internet | |
| 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 |