| Company | Ticker |
| 3D Systems Corp. | TDSC |
| 8x8 Inc. | EGHT |
| A.D.A.M. Inc. | ADAM |
| A123 Systems Inc. | AONE |
| ABII | ABII |
| Abiomed Inc. | ABMD |
| ABRAXIS BIOSCIENCE | APPX |
| ABX Air, Inc. | ABXA |
| ACADIA Pharmaceuticals Inc. | ACAD |
| Accelrys Inc. | ACCL |
| Acme Packet, Inc. | APKT |
| Actel Corporation | ACTL |
| Actions Semiconductor Co., Ltd. | ACTS |
| ActivIdentity Corporation | ACTI |
| Activision, Inc. | ATVI |
| Actuate Corp. | ACTU |
| Acxiom Corp. | ACXM |
| Adaptec, Inc. | ADPT |
| ADC Telecommunications | ADCT |
| Adept Technology Inc. | ADEP |
|