| Symbol | Name | Last Trade | Change | Volume |
|---|
| AACC | Asset Acceptance Capital Corp. | 6.63 May 22 |  0.02 (0.30%) | 227,524 | | AAME | Atlantic American Corp. | 3.62 May 22 | 0.01 (0.28%) | 32,108 | | AAON | AAON Inc. | 33.22 May 22 | 0.71 (2.18%) | 64,367 | | AAPL | Apple Inc. | 441.35 May 22 | 1.69 (0.39%) | 15,830,694 | | AAWW | Atlas Air Worldwide Holdings Inc. | 45.47 May 22 | 1.05 (2.26%) | 267,253 | | ABAX | Abaxis, Inc. | 43.51 May 22 | 0.71 (1.61%) | 168,393 | | ABCB | Ameris Bancorp | 16.06 May 22 | 0.39 (2.37%) | 51,022 | | ABCD | Cambium Learning Group, Inc. | 1.22 May 22 | 0.02 (1.46%) | 23,030 | | ABCO | The Advisory Board Company | 50.71 May 22 | 0.44 (0.86%) | 302,451 | | ABFS | Arkansas Best Corporation | 17.77 May 22 | 0.90 (4.82%) | 655,168 | | ABIO | ARCA biopharma, Inc. | 2.56 May 22 | 0.05 (1.99%) | 35,424 | | ABMD | ABIOMED, Inc. | 21.83 May 22 | 1.14 (4.96%) | 449,352 | | ABTL | Autobytel Inc. | 4.78 May 22 | 0.23 (5.05%) | 212,917 | | ACAD | ACADIA Pharmaceuticals Inc. | 13.42 May 22 | 0.37 (2.68%) | 2,369,655 | | ACAT | Arctic Cat Inc. | 46.96 May 22 | 0.75 (1.57%) | 171,946 | | ACCL | Accelrys Inc. | 8.65 May 22 | 0.06 (0.69%) | 144,940 | | ACET | Aceto Corp. | 11.77 May 22 | 0.02 (0.17%) | 147,370 | | ACFC | Atlantic Coast Financial Corporation | 5.17 May 22 | 0.06 (1.15%) | 14,487 | | ACFN | Acorn Energy, Inc. | 8.60 May 22 | 0.27 (3.24%) | 80,292 | | ACGL | Arch Capital Group Ltd. | 52.14 May 22 | 0.60 (1.14%) | 462,164 | | ACHC | Acadia Healthcare Company, Inc. | 32.20 May 22 | 0.13 (0.41%) | 556,898 | | ACHN | Achillion Pharmaceuticals, Inc. | 7.74 May 22 | 0.01 (0.13%) | 937,512 | | ACIW | ACI Worldwide, Inc. | 45.28 May 22 | 0.07 (0.15%) | 246,331 | | ACLS | Axcelis Technologies Inc. | 1.45 May 22 | 0.05 (3.33%) | 502,091 | | ACNB | ACNB Corp. | 16.65 May 22 | 0.22 (1.30%) | 5,256 | | ACOR | Acorda Therapeutics, Inc. | 32.08 May 22 | 0.32 (0.99%) | 398,217 | | ACPW | Active Power Inc. | 4.29 May 22 | 0.11 (2.50%) | 75,120 | | ACRX | AcelRx Pharmaceuticals, Inc. | 7.26 May 22 | 0.86 (13.44%) | 996,826 | | ACST | Acasti Pharma Inc. | 2.50 May 22 | 0.17 (6.37%) | 49,224 | | ACTG | Acacia Research Corporation | 23.59 May 22 | 0.77 (3.16%) | 791,104 | | ACTS | Actions Semiconductor Co., Ltd. | 3.00 May 22 | 0.06 (1.96%) | 129,341 | | ACUR | Acura Pharmaceuticals, Inc. | 2.34 May 22 | 0.04 (1.74%) | 521,659 | | ACXM | Acxiom Corporation | 21.26 May 22 | 0.48 (2.21%) | 474,723 | | ADAT | Authentidate Holding Corp. | 1.22 May 22 | 0.00 (0.00%) | 3,250 | | ADBE | Adobe Systems Inc. | 43.17 May 22 | 0.85 (1.93%) | 3,026,370 | | ADEP | Adept Technology Inc. | 3.53 May 22 | 0.05 (1.44%) | 41,330 | | ADES | ADA-ES, Inc. | 32.88 May 22 | 1.27 (3.72%) | 108,055 | | ADI | Analog Devices, Inc. | 45.55 May 22 | 1.01 (2.17%) | 4,085,541 | | ADNC | Audience, Inc. | 14.99 May 22 | 1.05 (6.55%) | 321,224 | | ADP | Automatic Data Processing, Inc. | 70.26 May 22 | 0.77 (1.08%) | 2,787,174 | | ADSK | Autodesk, Inc. | 36.57 May 22 | 0.91 (2.43%) | 3,428,660 | | ADTN | ADTRAN Inc. | 22.12 May 22 | 0.63 (2.77%) | 573,851 | | ADUS | Addus HomeCare Corporation | 15.91 May 22 | 0.25 (1.60%) | 286,180 | | ADVS | Advent Software, Inc. | 31.08 May 22 | 0.58 (1.83%) | 171,903 | | AEGN | Aegion Corporation | 22.99 May 22 | 0.63 (2.67%) | 257,285 | | AEGR | Aegerion Pharmaceuticals, Inc. | 58.25 May 22 | 1.77 (2.95%) | 768,725 | | AEHR | Aehr Test Systems | 1.27 May 22 | 0.02 (1.55%) | 7,100 | | AEIS | Advanced Energy Industries, Inc. | 18.49 May 22 | 0.44 (2.32%) | 611,047 | | AEPI | AEP Industries Inc. | 83.40 May 22 | 1.03 (1.22%) | 16,459 | | AERL | Asia Entertainment & Resources Ltd. | 4.93 May 22 | 0.28 (6.02%) | 1,322,927 |
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