| Maynooth University | Kildare County Council |
| Maynooth University - Department of Computer Science | Kildare County Council |
| Maynooth University - Hamilton Institute | Kildare County Council |
| MDS Gateways | Dublin City Council |
| MEANWEB | |
| Measuresoft Development Ltd | Cork City Council |
| Mechatrons | Wicklow County Council |
| Media Cube | Dún Laoghaire-Rathdown County Council |
| Media Science Technology | Dún Laoghaire-Rathdown County Council |
| Mediahouse | Laois County Council |
| Medical Technology Ireland | |
| Meili Travel Technology | |
| Mentea | Fingal County Council |
| Mercury Software Ltd | |
| MerrionIT | Dublin City Council |
| Mesh Security Ltd | |
| Metabolomic Diagnostics | |
| MIAS Pharma Ltd | |
| Michael Harrington | Roscommon County Council |
| Microfinance Ireland | |
| Micromail | Cork City Council |
| Micron Agritech | |
| Microsoft Ireland | Dún Laoghaire-Rathdown County Council |
| Microsphere Technology Ltd | |
| Microwarehouse Ltd | |
| MIDAS Ireland | Cork City Council |
| Millenium Software | Cork County Council |
| Mindmap Ltd | |
| MiniCorp | |
| Mint Tek | |
| MinuteBuyer Corporate Services Ltd | Dublin City Council |
| Mirai Medical | |
| Mizenonline | Cork City Council |
| MJ Flood Technology | Dublin City Council |
| MML Capital Ireland | |
| mobiForge | Dublin City Council |
| Mobil Information Systems | Fingal County Council |
| Modeva | Dún Laoghaire-Rathdown County Council |
| Modus IT Ltd | |
| MonoBiologics | |
| Mosaic | |
| Motarme | |
| Motherboard Ltd | Dublin City Council |
| MSD Ireland | |
| mSemicon | Dublin City Council |
| Multimedia.ie | Dún Laoghaire-Rathdown County Council |
| Munster PC Solutions | Limerick City and County Council |
| Munster Technological University | Cork City Council |
| Murray Consultants | |
| Myhost.ie | Dublin City Council |