| Abbreviation | Definition |
|---|---|
| PRX | Protox Therapeutics Incorporated (de-listed) |
| PRX | Protox Therapeutics Incorporated (de-listed) |
| PSD | Pulse Seismic Inc. |
| PSD | Pulse Seismic Incorporated |
| PSF | Preferred Share Investment Trust |
| PSI | Pason Systems Inc. |
| PSI | Pason Systems, Incorporated |
| PSR | Polar Star Mining Corporation |
| PSV | Pure Energy Services Ltd. |
| PSV | Pure Energy Services LTD. (de-listed) |
| PSV | Pure Energy Services LTD. (de-listed) |
| PSX | ProspEx Resources Ltd. |
| PSX | ProspEx Resources LTD. (de-listed) |
| PSX | ProspEx Resources LTD. (de-listed) |
| PTI | Patheon Inc. |
| PTI | Patheon Incorporated (de-listed) |
| PTI | Patheon Incorporated (de-listed) |
| PTM | Platinum Group Metals Ltd. |
| PTO | Pareto Corporation |
| PTQ | Petaquilla Minerals Ltd. |