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| Company | Country | Branch |
| PS Business Parks, Inc. | USA | |
| PSB | Germany | IT Service |
| PSC Inc. | USA | |
| PSD Group | United Kingdom | Others |
| PSI | Germany | Software |
| PSINet Inc. | USA | |
| Psion | United Kingdom | Computer |
| PSS World Medical Inc. | USA | |
| PSW Technologies, Inc. | USA | |
| Psychemedics Corporation | USA | |
| PTEK Holdings, Inc. | USA | |
| PTI Holding Inc. | USA | |
| PTT Exploration And Production | Thailand | Oil |
| PubliCARD, Inc. | USA | |
| Pulsion Medical Systems | Germany | Medicine |
| Puma | Germany | Clothes |
| Puma Technology, Inc. | USA | |
| Purchasepro | USA | Software |
| Pure Entertainment Games | United Kingdom | Media |
| Pure World, Inc. | USA | |
| PVF Capital Corp. | USA | |
| PWO Progress-Werk Oberkirch | Germany | Car Suppliers |
| PYR Energy Corporation | USA | |
| Pyramid Breweries, Inc. | USA |
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