| Company | Location |
|---|---|
| PRO Scientific Inc. | Oxford, Connecticut, United States |
| PRO-1 NANOSolutions | Tartu, Estonia |
| Procter & Gamble Co. | Cincinnati, Ohio, United States |
| Project Navigator | Brea, California, United States |
| Prolinx Inc. | Bothell, Washington, United States |
| Promerus LLC | Brecksville, Ohio, United States |
| PROMOS | Hsinchu, Taiwan |
| Pronano AB | Malmo, Sweden |
| Proteus Biomedical Inc. | Menlo Park, California, United States |
| Protiveris Inc. | Rockville, Maryland, United States |
