| Company | Location |
|---|---|
| Angstron Materials | Dayton, Ohio, United States |
| ANKA Angstromquelle Karlsruhe GmbH | Eggenstein-Leopoldshafen, Germany |
| Anson Nanotechnology Group Co. Ltd. | Wanchai, Hong Kong, China |
| Ansys, Inc. | Canonsburg, Pennsylvania, United States |
| Antenna Group | San Francisco, California, United States |
| Anton Paar USA | Ashland, Virginia, United States |
| AorTech | Rogers, Minnesota, United States |
| AP Materials | St. Louis, Michigan, United States |
| Apax Partners Inc. | Menlo Park, California, United States |
| APEX Technologies Inc. | Independence, Kentucky, United States |
