| Abbreviation | Definition |
|---|---|
| PPOD | PeaPod, Incorporated (de-listed) |
| PPOS | HealthStar, Inc. |
| PPOS | HealthStar, Incorporated (de-listed) |
| PPOS | HealthStar, Incorporated (de-listed) |
| PPRO | PurchasPro.Com, Inc. |
| PPRO | PurchasPro.Com, Incorporated (de-listed) |
| PPRO | PurchasPro.Com, Incorporated (de-listed) |
| PPRT | Pharmaprint, Inc. |
| PPRT | Pharmaprint, Incorporated (de-listed) |
| PPRT | Pharmaprint, Incorporated (de-listed) |
| PPRX | Park Pharmacy Corporation |
| PPTI | Protein Polymer Technology, Inc. |
| PPTI | Protein Polymer Technology, Incorporated (de-listed) |
| PPTI | Protein Polymer Technology, Incorporated (de-listed) |
| PPTV | P P T Vision, Inc. |
| PPWCN | Pennsylvania Power Company |
| PPWCN | Pennsylvania Power Company (de-listed) |
| PPWCN | Pennsylvania Power Company (de-listed) |
| PPWCO | Pennsylvania Power Company |
| PPWCO | Pennsylvania Power Company (de-listed) |