| Protiviti, Inc. | Ontario |
| Proto 3000, Inc. | Ontario |
| Proto Global Ltd | |
| Protocol Network Services | Nova Scotia |
| Proton Technologies Canada, Inc. | |
| Protospace | Alberta |
| Protractor Software, Inc. | |
| Protroleum Technologies, Inc. | Alberta |
| Protus IP Solutions | Ontario |
| Proud Productions | Quebec |
| Prova Innovations Ltd | |
| Provalis Research | Quebec |
| Provance Technologies, Inc. | Quebec |
| Providence Therapeutics | |
| Providence University College & Theological Seminary | |
| Provincial Informatique | Quebec |
| Provision Data Systems, Inc. | British Columbia |
| Provo Ltd | Ontario |
| ProWeave | British Columbia |
| ProWeb | Quebec |
| Prowl Communnications | |
| Proxi Télécom | Quebec |
| Proxify | |
| Proximify | |
| Prudent Financial | |
| Prudle Labs, Inc. | |
| Pruve Web Agency Corporation | |
| PS Neville | Manitoba |
| PSCAD | |
| PSI Data | Ontario |
| PSI Networks, Inc. | Ontario |
| Psiphon | Ontario |
| Psiphon, Inc. | |
| PSM Digital Agency | |
| PSQ Technologies, Inc. | Quebec |
| Pstox | Quebec |
| PubInteractive SG | Quebec |
| Publi-7 Communications | Quebec |
| Public Consulting Group Canada | Quebec |
| Public Incubator, Inc. | |
| Public Mobile | |
| Public Mobile, Inc. | Quebec |
| Publicis Hawkeye Canada | |
| Publicize Pro | |
| Publitech | Quebec |
| Publix Solutions | Quebec |
| PubNIX, Inc. | Quebec |
| Pucara Gold Ltd | |
| Pulsar | |
| Pulse Communications | New Brunswick |