| Abbreviation | Definition |
|---|---|
| PERX | Perini Corporation |
| PF | Pioneer and Fayette Railroad |
| PF | Pioneer and Fayette Railroad Company |
| PFE | Pacific Fruit Express (Union Pacific Railroad) |
| PFM | Power, Fluid & Metals |
| PFMX | Perdue Transportation |
| PFMX | Perdue Transportation Incorporated |
| PFRX | Parks Propane and Appliance |
| PFRX | Parks Propane and Appliance Incorporated |
| PFSX | Private Fuel Storage |
| PGCX | Peoples Gas System |
| PGCX | Peoples Gas System Incorporated |
| PGDX | Procter and Gamble Manufacturing |
| PGDX | Procter and Gamble Manufacturing Company |
| PGE | British Columbia Rail Limited |
| PGE | Pacific Great Eastern Railway (Canadian National Railway) |
| PGER | Pacific Great Eastern Railway (Canadian National Railway) |
| PGEX | Portland General Electric |
| PGEX | Portland General Electric Company |
| PGHU | The Pasha Group |