| Abbreviation | Definition |
|---|---|
| PRSPP | Prosperity Bancshares Incorporated Preferred (de-listed) |
| PRST | Presstek Inc |
| PRST | Presstek Incorporated (de-listed) |
| PRST | Presstek Incorporated (de-listed) |
| PRSW | Persistance Software Inc |
| PRSW | Persistance Software Incorporated (de-listed) |
| PRSW | Persistance Software Incorporated (de-listed) |
| PRTG | P R T Group |
| PRTI | Phoenix Resource Tech Inc |
| PRTK | Profile Technologies Inc |
| PRTL | Primus Telecom Group Inc |
| PRTU | Pretory USA, Inc. |
| PRTW | Printware, Inc. |
| PRVH | Providential Holdings |
| PRVT | Private Media Group, LTD. |
| PRVW | Preview Systems, Inc. |
| PRWW | Premier Research Worldwide |
| PRXC | Premium Restaurant Company |
| PRXL | Parexel International Corporation |
| PRXX | Praxis Pharmaceuticals, Inc. |