| Company | Location |
|---|---|
| Photron | San Diego, California, United States |
| Phrasor Scientific Inc. | Duarte, California, United States |
| Physical Electronics Laboratory | Zurich, Switzerland |
| Physical Electronics USA | Chanhassen, Minnesota, United States |
| Physical Optics Corp. | Torrance, California, United States |
| Physik Instrumente GmbH & Co. KG | Karlsruhe/Palmbach, Germany |
| PI (Physik Instrumente) L.P. | Auburn, Massachusetts, United States |
| PI (Physik Instumente) | Auburn, Massachusetts, United States |
| PI Ceramic GmbH | Lederhose, Germany |
| PI NanoPositioning & Piezo Technology | Auburn, Massachusetts, United States |
