| Company | Location |
|---|---|
| American Electric Power | Columbus, Ohio, United States |
| American Elements | Los Angeles, California, United States |
| American Express | New York, New York, United States |
| American Institute of Aeronautics and Astronautics | Reston, Virginia, United States |
| American Pharmaceutical Partners Inc. | Los Angeles, California, United States |
| American Precision Dicing Inc. | San Jose, California, United States |
| 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 |
