| Company | Location |
|---|---|
| Atomic Force F&E | Mannheim, Germany |
| Atomic-Scale Design Inc. | Westlake Village, California, United States |
| AtomWorks | Glencoe, Illinois, United States |
| ATOS GmbH | Pfungstadt, Germany |
| ATP Oil & Gas Corp. | Houston, Texas, United States |
| ATR Adaptive Communications Research Laboratories | Kyoto, Japan |
| attocube systems AG | Munich, Germany |
| ATX Inc. | Irving, Texas, United States |
| Auburn University - Detection and Food Safety Center | Auburn University, Alabama, United States |
| Aura Nanotechnology | Ruston, Louisiana, United States |
