| Abbreviation | Definition |
|---|---|
| PCTR | Perceptronics, Inc. |
| PCTU | Pro Tech Communications, Inc. |
| PCTV | People's Choice TV Corporation |
| PCWR | Portacom Wireless, Inc. |
| PCWRQ | Portacom Wireless, Inc. (in bankruptcy) |
| PCYC | Pharmacyclics, Inc. |
| PCYL | Pure Cycle Corporation |
| PCYN | Procyon Corporation |
| PDAP | Palm Desert Art, Inc. |
| PDCCD | Princeton Dental Management Corporation |
| PDCI | P D C Innovative Industries |
| PDCO | Patterson Dental Company |
| PDEN | Pet Quarters, Inc. |
| PDER | Pardee Resource Company, Inc. |
| PDER | Pardee Resource Company, Incorporated |
| PDEX | Pro Dex, Inc., of Colorado |
| PDEX | Pro Dex, Incorporated, of Colorado |
| PDGE | P D G Environmental, Inc. |
| PDHI | People Dynamics Holdings, Inc. |
| PDHS | Pacific Diversified Holdings |