| Abbreviation | Definition |
|---|---|
| PTRO | PetroMinerals Corporation |
| PTRS | Potters Financial Corporation |
| PTRY | The Pantry, Inc. |
| PTSC | Patriot Scientific Corporation |
| PTSI | P A M Transportation Service, Inc. |
| PTUS | Peritus Software Service |
| PTVL | Preview Travel, Inc. |
| PTXXE | Phage Therapeutics International I |
| PTXXE | Phage Therapeutics International I (de-listed) |
| PTXXE | Phage Therapeutics International I (de-listed) |
| PUBC | PureBase Corporation |
| PUBFC | Elephant & Castle Group I |
| PUBFC | Elephant & Castle Group I (de-listed) |
| PUBFC | Elephant & Castle Group I (de-listed) |
| PUBO | Pubco Corporation |
| PUDGE | Pudgies Chicken, Inc. |
| PUFF | Grand Havana Enterprises, Inc. |
| PUFF | Grand Havana Enterprises, Incorporated (de-listed) |
| PUFF | Grand Havana Enterprises, Incorporated (de-listed) |
| PUFFW | Grand Havana Enterprises, Inc. Warrants |