| Company | Location |
|---|---|
| Advantest America | Santa Clara, California, United States |
| Advectus Life Sciences Inc. | West Vancouver, British Columbia, Canada |
| Advion BioSciences Inc. | Ithaca, New York, United States |
| AEgis Technologies Group Inc. | Huntsville, Alabama, United States |
| Aeonian Bricks | Summerville, South Carolina, United States |
| Aerodyne Research Inc. | Billerica, Massachusetts, United States |
| Aerogen | Mountain View, California, United States |
| Aerotech Inc. | Pittsburgh, Pennsylvania, United States |
| Affymetrix Inc. | Santa Clara, California, United States |
| African Pegmatite | Meyerton, Gauteng, South Africa |
