| Abbreviation | Definition |
|---|---|
| PTEDL | Potomac Edison Company |
| PTEHE | Periotec, Inc. |
| PTEK | PTEK Holdings |
| PTEL | Powertel, Inc. |
| PTEN | Patterson Energy, Inc. |
| PTET | Platinum Entertainment, Inc. |
| PTHW | The Pathways Group, Inc. |
| PTIDY | Inti Indorayon Utama |
| PTII | P T I Holding, Inc. |
| PTIS | Plasma Therm, Inc. |
| PTIX | Performance Technologies |
| PTLD | Petrol Industries, Inc. |
| PTMBP | Potomac Electric Power Company Preferred |
| PTMWE | Polythemus Corporation |
| PTNM | P T N Media, Inc. |
| PTNR | Partner Communications Company |
| PTNX | Printronix, Inc. |
| PTP.H | P2P Health Systems, Inc. |
| PTPE.OB | Pantera Petroleum, Inc. |
| PTPLF | Petrologic Petroleum, LTD. (de-listed) |