| OTG42 | Dublin City Council |
| Outsource Graphix Ltd | Dublin City Council |
| Outsource Technical Concepts | |
| Outwork Media Ltd | |
| Ovoca Bio plc | |
| OWCS | |
| Owens DDB | |
| OWI Web Development | |
| Pandu Solutions | |
| Paper Dock | Dublin City Council |
| PaqIT Solutions | Limerick City and County Council |
| PasRM | |
| Passion for Creative | |
| Paulo Goode | Cork County Council |
| PaymentPlus | |
| Payslip | |
| Payzone | Dublin City Council |
| PC Peripheral | Dún Laoghaire-Rathdown County Council |
| Pearl & Dean | |
| Pearstop | |
| Peat Wholesale Ltd | Dublin City Council |
| Pegasus Capital | Dublin City Council |
| PepTalk | |
| Perfuze | |
| Permanent TSB plc | |
| Perrigo Company plc | |
| Personal Computer Science (Ireland) Ltd | Mayo County Council |
| Persuva | |
| Pewter Games Studios | |
| PFH Technology Group | Dún Laoghaire-Rathdown County Council |
| phoneLot | Dublin City Council |
| PhonePulse | |
| PhoneWatch | |
| Phorest Salon Software | Dublin City Council |
| Phyxiom Ltd | |
| Picography | |
| Piercom Ltd | Clare County Council |
| Pingy | Dublin City Council |
| Pippin Software Ltd | South Dublin County Council |
| Pitman Training Group Ltd | |
| PixAlert | Dublin City Council |
| Pixel Web Design | Dublin City Council |
| Pixelated Bubble Ltd | |
| PixelSoup | Dublin City Council |
| Planet | |
| PlanNet21 Communications | |
| PlanWare | Dún Laoghaire-Rathdown County Council |
| PlasmaBound | |
| Plastic Hallway | Dublin City Council |
| PlayTank | Dublin City Council |