| Perficient Technologies | |
| Performa Marketing | |
| Performance Advantage | Ontario |
| Performance Analytics Corporation | |
| Performance Computers | Ontario |
| Performance Computing | British Columbia |
| Performance Human Resources Corporation | |
| Performance M&T | Quebec |
| Performance Systems, Inc. | Alberta |
| Performannce Informatique | Quebec |
| Perfortics Consulting, Inc. | Ontario |
| Perimeter Institute for Theoritical Physics | Ontario |
| PeriPharm | |
| Perk Labs | |
| Permalution | Quebec |
| Perpetual Motion Enterprises Ltd | Ontario |
| Perpetual Notion Design | Alberta |
| Perpetual West | Alberta |
| Perron Technologies | Quebec |
| Perry + Currier | Ontario |
| Perry Computer Services | Ontario |
| Perseus Group | |
| Persha Computer Engineering | Ontario |
| Persimmonsoft Technologies | Ontario |
| Persiscode Solutions | |
| Persistence AI | |
| Persuasive Media | Manitoba |
| Perth Communications | Ontario |
| Pesold Solutions | New Brunswick |
| PetBot | Ontario |
| Peterborough Design | Ontario |
| Peterborough Linux User Group | Ontario |
| Peterson Capital | |
| Petro-Canada Mobility | Ontario |
| Petro-Geotech, Inc. | Alberta |
| PetRos Eikon, Inc. | Ontario |
| PetroStudies Consultants, Inc. | Alberta |
| Peytec, Inc. | Ontario |
| PFC Flexible Circuits Ltd | Ontario |
| Pfizer Canada | |
| PFM Capital, Inc. | |
| PFM Scheduling Services | |
| PG Laser Ltd | British Columbia |
| PG Music, Inc. | British Columbia |
| PG Solutions | Quebec |
| PG Tech | Quebec |
| PG Web Designs Ltd | British Columbia |
| PH1 Research, Inc. | |
| Phalanx Consulting, Inc. | Alberta |
| Phantech Software | Ontario |