| Company | Location |
|---|---|
| American Systems Technology Inc. | Troy, Michigan, United States |
| Amersham BioSciences UK Ltd. | Buckinghamshire, United Kingdom |
| Amgen | Thousand Oaks, California, United States |
| Amkor Technology Inc. | West Chester, Pennsylvania, United States |
| AMO GmbH | Aachen, Germany |
| Amptek Inc. | Bedford, Massachusetts, United States |
| AMR Technologies Inc. | Toronto, Ontario, Canada |
| Amri Inc. | Houston, Texas, United States |
| AMTEC GmbH | Chemnitz, Germany |
| Amuneal Manufacturing Corp. | Philadelphia, Pennsylvania, United States |
