| Abbreviation | Definition |
|---|---|
| PMD | Psychemedics Corporation |
| PN | Pennaco Energy, Inc. |
| PNB | Premier National Bancorp, Inc. |
| PNO | PANACO, Inc. |
| PPA | Premier Bancorp, Inc., of Pennsylvania |
| PPK | Polyair Inter Pack, Inc. |
| PPWP | PacifiCorp Preferred |
| PQT | HyperFeed Technologies |
| PR | Price Communications Corporation |
| PRB | PROBEX Corporation |
| PRG | Phoenix Restaurant Group Inc |
| PRK | Park National Corporation |
| PRL | Prolong International Corporation |
| PRZ | Prize Energy Corporation |
| PSB | P S Business Parks, Inc., of California |
| PSBPA | Ps Business Pks Inc Calif |
| PSI | Porta Systems Corporation |
| PSPY | S P D R Trust |
| PSU | Plastic Surgery Company |
| PSXT | Lehman Brothers Holdings, Inc. |