| Panasonic Technologies | Cupertino, California, United States |
| PANBIO Ltd. | Brisbane, Queensland, Australia |
| PanelClaw | North Andover, Massachusetts, United States |
| Pangaea Ventures Ltd. | Vancouver, British Columbia, Canada |
| Paper Battery Company | Troy, New York, United States |
| PAR Technologies LLC | Hampton, Virginia, United States |
| Parabon Computation | Reston, Virginia, United States |
| Paramount Sales Co. | Northbrook, Illinois, United States |
| Paratek Microwave Inc. | Columbia, Maryland, United States |
| Paroscientific Inc. | Redmond, Washington, United States |