| Abbreviation | Definition |
|---|---|
| PWER | Power One, Inc. |
| PWHS | Paper Warehouse, Inc. |
| PWIN | PlayAndWin, Inc. |
| PWOD | Penns Woods Bancorp, Inc. |
| PWRE | Ocean Power Corporation |
| PWREE | Ocean Power Corporation |
| PWSPE | Power Spectra, Inc. |
| PWTC | Power Technology, Inc. |
| PXCM | Proxicom, Inc. |
| PXMGE | Phoenix Media Group, LTD. |
| PXPLE | Pinnacle Exploration, Inc. |
| PXSYE | Phoenix Laser Systems, Inc. |
| PXXI | Prophet 21, Inc. |
| PYCSQ | Payless Cashways, Inc. (in bankruptcy) |
| PYOCE | Pyrocap International Corporation |
| PYOL | Pyramid Oil Company |
| PYPL | PayPal Holdings, Incorporated |
| PYPXE | PolyPastex United, Inc. |
| PYPXE | PolyPastex United, Incorporated (de-listed) |
| PYPXE | PolyPastex United, Incorporated (de-listed) |