| Abbreviation | Definition |
|---|---|
| POSC | Positron Corporation (de-listed) |
| POSC | Positron Corporation (de-listed) |
| POSCW | Positron Corporation Warrants |
| POSCW | Positron Corporation Warrants (de-listed) |
| POSCW | Positron Corporation Warrants (de-listed) |
| POSE | POSH International, Inc. |
| POSI | Point Of Sale, LTD. |
| POSNY | Peninsular & Oriental Steam Navigation (delisted) |
| POSO | Prosoft Training.Com |
| POSS | Possis Medical, Inc. |
| POST | Cypost Corporation |
| POTN | PrintOnTheNet.Com, Inc. |
| POVT | Provant, Inc. |
| POWDQ | Power Designs, Inc. (in bankruptcy) |
| POWI | Power Integrations, Inc. |
| POWL | Powell Industries, Inc. |
| POWR | Environmental Power Corporation |
| POWR | Environmental Power Corporation (de-listed) |
| POWR | Environmental Power Corporation (de-listed) |
| PPARW | Paging Partners Corporation Warrants |