| Symbol | Name | Last Trade | Change | Volume |
|---|
| AACC | Asset Acceptance Capital Corp. | 6.70 May 24 |  0.01 (0.15%) | 252,657 | | AAME | Atlantic American Corp. | 3.86 May 24 | 0.18 (4.89%) | 31,415 | | AAON | AAON Inc. | 33.47 May 24 | 0.43 (1.30%) | 98,797 | | AAPL | Apple Inc. | 445.15 May 24 | 3.01 (0.68%) | 9,872,377 | | AAWW | Atlas Air Worldwide Holdings Inc. | 45.31 May 24 | 0.11 (0.24%) | 164,446 | | ABAX | Abaxis, Inc. | 43.65 May 24 | 0.12 (0.28%) | 52,308 | | ABCB | Ameris Bancorp | 16.39 May 24 | 0.30 (1.86%) | 18,600 | | ABCD | Cambium Learning Group, Inc. | 1.32 May 24 | 0.02 (1.42%) | 40,431 | | ABCO | The Advisory Board Company | 50.38 May 24 | 0.19 (0.38%) | 107,262 | | ABFS | Arkansas Best Corporation | 17.67 May 24 | 0.04 (0.23%) | 403,330 | | ABIO | ARCA biopharma, Inc. | 2.66 May 24 | 0.10 (3.91%) | 33,247 | | ABMD | ABIOMED, Inc. | 21.98 May 24 | 0.26 (1.20%) | 339,568 | | ABTL | Autobytel Inc. | 4.63 May 24 | 0.22 (4.54%) | 33,626 | | ACAD | ACADIA Pharmaceuticals Inc. | 14.19 May 24 | 0.40 (2.89%) | 2,831,500 | | ACAT | Arctic Cat Inc. | 47.03 May 24 | 0.39 (0.84%) | 57,765 | | ACCL | Accelrys Inc. | 8.55 May 24 | 0.08 (0.93%) | 145,145 | | ACET | Aceto Corp. | 11.86 May 24 | 0.08 (0.67%) | 97,710 | | ACFC | Atlantic Coast Financial Corporation | 5.17 May 23 | 0.00 (0.00%) | 0 | | ACFN | Acorn Energy, Inc. | 8.83 May 24 | 0.16 (1.85%) | 79,993 | | ACGL | Arch Capital Group Ltd. | 52.28 May 24 | 0.20 (0.38%) | 250,639 | | ACHC | Acadia Healthcare Company, Inc. | 32.90 May 24 | 0.16 (0.49%) | 174,381 | | ACHN | Achillion Pharmaceuticals, Inc. | 7.58 May 24 | 0.06 (0.79%) | 482,454 | | ACIW | ACI Worldwide, Inc. | 45.55 May 24 | 0.21 (0.46%) | 370,569 | | ACLS | Axcelis Technologies Inc. | 1.59 May 24 | 0.09 (6.00%) | 649,692 | | ACNB | ACNB Corp. | 16.75 May 24 | 0.00 (0.00%) | 700 | | ACOR | Acorda Therapeutics, Inc. | 32.67 May 24 | 0.44 (1.37%) | 269,290 | | ACPW | Active Power Inc. | 4.31 May 24 | 0.08 (1.89%) | 17,053 | | ACRX | AcelRx Pharmaceuticals, Inc. | 7.86 May 24 | 0.41 (5.50%) | 568,136 | | ACST | Acasti Pharma Inc. | 2.56 May 23 | 0.00 (0.00%) | 0 | | ACTG | Acacia Research Corporation | 23.53 May 24 | 0.01 (0.04%) | 523,927 | | ACTS | Actions Semiconductor Co., Ltd. | 3.00 May 24 | 0.02 (0.67%) | 8,204 | | ACUR | Acura Pharmaceuticals, Inc. | 2.37 May 24 | 0.01 (0.42%) | 137,922 | | ACXM | Acxiom Corporation | 21.46 May 24 | 0.00 (0.00%) | 212,781 | | ADAT | Authentidate Holding Corp. | 1.13 May 24 | 0.03 (2.59%) | 14,911 | | ADBE | Adobe Systems Inc. | 42.43 May 24 | 0.34 (0.79%) | 3,766,131 | | ADEP | Adept Technology Inc. | 3.98 May 24 | 0.44 (12.43%) | 90,408 | | ADES | ADA-ES, Inc. | 35.37 May 24 | 1.55 (4.58%) | 243,998 | | ADI | Analog Devices, Inc. | 45.37 May 24 | 0.12 (0.26%) | 1,113,036 | | ADNC | Audience, Inc. | 14.77 May 24 | 0.03 (0.20%) | 114,014 | | ADP | Automatic Data Processing, Inc. | 69.85 May 24 | 0.08 (0.11%) | 1,569,804 | | ADSK | Autodesk, Inc. | 36.08 May 24 | 0.38 (1.04%) | 2,767,960 | | ADTN | ADTRAN Inc. | 22.28 May 24 | 0.10 (0.45%) | 348,499 | | ADUS | Addus HomeCare Corporation | 16.26 May 24 | 0.47 (2.98%) | 93,568 | | ADVS | Advent Software, Inc. | 31.61 May 24 | 0.11 (0.35%) | 131,207 | | AEGN | Aegion Corporation | 22.89 May 24 | 0.07 (0.30%) | 98,938 | | AEGR | Aegerion Pharmaceuticals, Inc. | 60.09 May 24 | 0.87 (1.43%) | 278,464 | | AEHR | Aehr Test Systems | 1.40 May 24 | 0.01 (0.72%) | 2,936 | | AEIS | Advanced Energy Industries, Inc. | 18.09 May 24 | 0.06 (0.33%) | 290,127 | | AEPI | AEP Industries Inc. | 83.53 May 24 | 1.57 (1.92%) | 23,219 | | AERL | Asia Entertainment & Resources Ltd. | 4.37 May 24 | 0.10 (2.34%) | 250,205 |
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