| Principal Computers | Tasmania |
| Printatech Systems Pty Ltd | Victoria |
| Printercare Maintenance | New South Wales |
| Prismatik Pty Ltd | New South Wales |
| Privasec Pty Ltd | New South Wales |
| Pro Internet Marketing Pty Ltd | Victoria |
| Pro Medicus Ltd | Victoria |
| Procad Pty Ltd | Western Australia |
| proconX Pty Ltd | Queensland |
| Prodigy Communications Pty Ltd | New South Wales |
| Professional Advantage Pty Ltd | |
| Professional Support Group Pty Ltd | Western Australia |
| Professional Web Solutions | Western Australia |
| Progressive Business Technologies | Queensland |
| Progressive Digital Marketing | New South Wales |
| Project Computing Pty Ltd | Australian Capital Territory |
| Project Perfect | New South Wales |
| Project Simple | |
| Project Telecoms | New South Wales |
| Prometheus AI Pty Ltd | |
| Prometix Pty Ltd | |
| Pronamics Pty Ltd | Queensland |
| Pronto Software Ltd | |
| Propanc Pty Ltd | Victoria |
| Propeld | |
| Propeller Graphic Design & Marketing | Queensland |
| Propeller Head | Victoria |
| Proper | |
| Property Exchange Australia Ltd | Victoria |
| PropertyMe | New South Wales |
| Prophecy International Pty Ltd | South Australia |
| PropHero | |
| Proscan Australia Pty Ltd | New South Wales |
| Prosnet | |
| Prospecta Software Pty Ltd | New South Wales |
| Prota Therapeutics Pty Ltd | |
| Protecht | New South Wales |
| Proteomics International Laboratories Ltd | Western Australia |
| Proto Axiom | |
| Protocomtech | New South Wales |
| Provectus Algae | |
| Proven Digital Marketing | |
| Psylo Pty Ltd | |
| PT Digital Services | South Australia |
| PTNG Scientific | |
| Pulse Club | New South Wales |
| Pulse Software | New South Wales |
| Pulse Telecom Pty Ltd | New South Wales |
| Pulse+IT News | |
| Pulseone | Western Australia |