| Company | Ticker |
| Aastrom Biosciences | ASTM |
| Abaxis Inc. | ABAX |
| Abiomed Inc. | ABMD |
| ACADIA Pharmaceuticals Inc. | ACAD |
| Accelrys Inc. | ACCL |
| ACI Worldwide Inc. | ACIW |
| Acorda Therapeutics Inc. | ACOR |
| Actions Semiconductor Co., Ltd. | ACTS |
| Activision, Inc. | ATVI |
| Adept Technology Inc. | ADEP |
| Adobe Systems Incorporated | ADBE |
| Adtran, Inc. | ADTN |
| Advanced Energy | AEIS |
| Advent Software, Inc. | ADVS |
| Aegerion Pharmaceuticals, Inc. | AEGR |
| Aehr Test Systems | AEHR |
| Aeterna Zentaris | AEZS |
| Agilysys Inc. | AGYS |
| AIXTRON | AIXG |
| Akamai Technologies, Inc. | AKAM |
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