| Opem Print Solutions Ltd | Wellington |
| Open Polytechnic | Wellington |
| Openhost | Auckland |
| Opmetrix | Canterbury |
| Optimal Workshop Ltd | |
| Optimation Group | Wellington |
| Optimum Marketing Ltd | Wellington |
| Optimus Systems Ltd | Auckland |
| Oracle New Zealand | Auckland |
| Oraco Solutions Ltd | Waikato |
| Orange Direct | Auckland |
| Orbica | Canterbury |
| Orbits IT Solution Ltd | Auckland |
| OrcaCom Ltd | Auckland |
| Orchid | Auckland |
| ORCL Toolbox Ltd | Auckland |
| Orcon | Auckland |
| Original Image Ltd | Auckland |
| Oryx Technologies Ltd | Wellington |
| OSL Software | Auckland |
| OSS Group | Auckland |
| Otago Polytechnic | Otago |
| Otago Polytechnic - Computing & IT | Otago |
| Our School Ltd | Auckland |
| Outwide Ltd | Wellington |
| Overclockers New Zealand | Canterbury |
| Overdose | |
| Oystercatcher Design Ltd | Canterbury |
| Pacific Channel | Auckland |
| Pacific Edge Ltd | Otago |
| Pacific International Hotel Management School | |
| Pacific Technology Solutions | Waikato |
| Packet Technologies Ltd | Auckland |
| Pacsoft International Ltd | Auckland |
| Pageproof.com Ltd | Auckland |
| Pan Pacific Capital Ltd | Auckland |
| PaperKite | Wellington |
| Paragon Computers Ltd | Canterbury |
| Paragon Consulting Group Ltd | Auckland |
| Paragon Design Ltd | Auckland |
| Patrick Anthony Associates Ltd | Auckland |
| Pattern | Auckland |
| PB Technologies Ltd | Auckland |
| PC Anytime Ltd | Canterbury |
| PC Heroes | Waikato |
| PC Logic | Manawatu-Wanganui |
| PC Patch | Wellington |
| PC Service Centre | Canterbury |
| PC Systems Ltd | Nelson |
| PC TROUBLE - Whangarei | Northland |