| Symbol | Name | Last Trade | Change | Volume |
|---|
| AACC | Asset Acceptance Capital Corp. | 6.65 May 21 | 0.01 (0.15%) | 133,656 | | AAME | Atlantic American Corp. | 3.63 May 21 | 0.00 (0.12%) | 32,230 | | AAON | AAON Inc. | 32.51 May 21 | 0.35 (1.09%) | 41,643 | | AAPL | Apple Inc. | 439.66 May 21 | 3.27 (0.74%) | 16,296,320 | | AAWW | Atlas Air Worldwide Holdings Inc. | 46.52 May 21 | 0.22 (0.48%) | 165,919 | | ABAX | Abaxis, Inc. | 44.22 May 21 | 0.45 (1.01%) | 289,679 | | ABCB | Ameris Bancorp | 16.45 May 21 | 0.01 (0.06%) | 7,750 | | ABCD | Cambium Learning Group, Inc. | 1.20 May 21 | 0.05 (4.56%) | 3,770 | | ABCO | The Advisory Board Company | 51.15 May 21 | 0.80 (1.59%) | 289,511 | | ABFS | Arkansas Best Corporation | 18.67 May 21 | 0.93 (5.24%) | 1,464,387 | | ABIO | ARCA biopharma, Inc. | 2.51 May 21 | 0.17 (7.26%) | 56,074 | | ABMD | ABIOMED, Inc. | 22.97 May 21 | 0.14 (0.61%) | 327,328 | | ABTL | Autobytel Inc. | 4.55 May 21 | 0.34 (8.08%) | 101,541 | | ACAD | ACADIA Pharmaceuticals Inc. | 13.79 May 21 | 0.36 (2.54%) | 3,446,344 | | ACAT | Arctic Cat Inc. | 47.71 May 21 | 0.82 (1.75%) | 144,214 | | ACCL | Accelrys Inc. | 8.71 May 21 | 0.01 (0.11%) | 224,116 | | ACET | Aceto Corp. | 11.79 May 21 | 0.07 (0.59%) | 75,271 | | ACFC | Atlantic Coast Financial Corporation | 5.23 May 21 | 0.12 (2.24%) | 13,812 | | ACFN | Acorn Energy, Inc. | 8.33 May 21 | 0.39 (4.91%) | 50,684 | | ACGL | Arch Capital Group Ltd. | 52.74 May 21 | 0.69 (1.29%) | 634,307 | | ACHC | Acadia Healthcare Company, Inc. | 32.07 May 21 | 0.90 (2.73%) | 768,722 | | ACHN | Achillion Pharmaceuticals, Inc. | 7.75 May 21 | 0.20 (2.65%) | 1,220,835 | | ACIW | ACI Worldwide, Inc. | 45.35 May 21 | 0.20 (0.44%) | 339,273 | | ACLS | Axcelis Technologies Inc. | 1.50 May 21 | 0.03 (1.96%) | 553,295 | | ACNB | ACNB Corp. | 16.87 May 21 | 0.04 (0.22%) | 1,900 | | ACOR | Acorda Therapeutics, Inc. | 32.40 May 21 | 0.24 (0.75%) | 384,022 | | ACPW | Active Power Inc. | 4.40 May 21 | 0.04 (0.90%) | 43,790 | | ACRX | AcelRx Pharmaceuticals, Inc. | 6.40 May 21 | 0.06 (0.93%) | 1,920,778 | | ACST | Acasti Pharma Inc. | 2.67 May 21 | 0.06 (2.30%) | 13,168 | | ACTG | Acacia Research Corporation | 24.36 May 21 | 0.20 (0.81%) | 317,998 | | ACTS | Actions Semiconductor Co., Ltd. | 3.06 May 21 | 0.01 (0.33%) | 65,441 | | ACUR | Acura Pharmaceuticals, Inc. | 2.30 May 21 | 0.10 (4.17%) | 527,840 | | ACXM | Acxiom Corporation | 21.74 May 21 | 0.06 (0.28%) | 265,044 | | ADAT | Authentidate Holding Corp. | 1.22 May 21 | 0.02 (1.67%) | 15,431 | | ADBE | Adobe Systems Inc. | 44.02 May 21 | 0.27 (0.61%) | 1,828,187 | | ADEP | Adept Technology Inc. | 3.48 May 21 | 0.01 (0.37%) | 24,978 | | ADES | ADA-ES, Inc. | 34.15 May 21 | 0.41 (1.22%) | 74,905 | | ADI | Analog Devices, Inc. | 46.56 May 21 | 0.31 (0.66%) | 2,496,906 | | ADNC | Audience, Inc. | 16.04 May 21 | 0.00 (0.00%) | 125,007 | | ADP | Automatic Data Processing, Inc. | 71.03 May 21 | 0.02 (0.03%) | 1,959,283 | | ADSK | Autodesk, Inc. | 37.48 May 21 | 0.49 (1.32%) | 3,278,892 | | ADTN | ADTRAN Inc. | 22.75 May 21 | 0.06 (0.26%) | 786,405 | | ADUS | Addus HomeCare Corporation | 15.66 May 21 | 0.15 (0.97%) | 98,613 | | ADVS | Advent Software, Inc. | 31.66 May 21 | 0.05 (0.16%) | 150,739 | | AEGN | Aegion Corporation | 23.62 May 21 | 0.13 (0.55%) | 164,818 | | AEGR | Aegerion Pharmaceuticals, Inc. | 60.02 May 21 | 0.09 (0.15%) | 350,685 | | AEHR | Aehr Test Systems | 1.29 May 21 | 0.03 (2.27%) | 300 | | AEIS | Advanced Energy Industries, Inc. | 18.93 May 21 | 0.16 (0.85%) | 395,925 | | AEPI | AEP Industries Inc. | 84.43 May 21 | 0.43 (0.51%) | 7,850 | | AERL | Asia Entertainment & Resources Ltd. | 4.65 May 21 | 0.51 (12.32%) | 618,186 |
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