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| AACC | Asset Acceptance Capital Corp. | AAII | Alabama Aircraft Industries, Inc. |
| AAME | Atlantic American Corporation | AANB | Abigail Adams National Bancorp, Inc. |
| AAON | AAON, Inc. | AAPL | Apple Inc. |
| AATI | Advanced Analogic Technologies, Inc. | AAUK | Anglo American plc |
| AAWW | Atlas Air Worldwide Holdings | ABAT | Advanced Battery Technologies, Inc. |
| ABAX | ABAXIS, Inc. | ABBC | Abington Bancorp, Inc. |
| ABCB | Ameris Bancorp | ABCO | Advisory Board Company (The) |
| ABCW | Anchor BanCorp Wisconsin Inc. | ABFS | Arkansas Best Corporation |
| ABII | Abraxis Bioscience Inc. | ABMC | American Bio Medica Corp. |
| ABMD | ABIOMED, Inc. | ABNJ | American Bancorp of New Jersey, Inc. |
| ABPI | Accentia Biopharmaceuticals, Inc. | ABTL | Autobytel Inc. |
| ABVA | Alliance Bankshares Corporation | ACAD | ACADIA Pharmaceuticals Inc. |
| ACAP | American Physicians Capital, Inc. | ACAS | American Capital, Ltd. |
| ACAT | Arctic Cat Inc. | ACBA | American Community Bancshares |
| ACCL | Accelrys, Inc. | ACEL | Alfacell Corporation |
| ACET | Aceto Corporation | ACFC | Atlantic Coast Federal Corporation |
| ACFN | Acorn Energy, Inc. | ACGL | Arch Capital Group Ltd. |
| ACGY | Acergy S.A. | ACHN | Achillion Pharmaceuticals, Inc. |
| ACIW | ACI Worldwide, Inc. | ACLI | American Commercial Lines Inc |
| ACLS | Axcelis Technologies, Inc. | ACME | ACME Communications, Inc. |
| ACMR | A.C. Moore Arts & Crafts, Inc. | ACOR | Acorda Therapeutics, Inc. |
| ACPW | Active Power, Inc. | ACSEF | ACS Motion Control Ltd. |
| ACTG | Acacia Research Corporation | ACTI | ActivIdentity Corporation |
| ACTL | Actel Corporation | ACTS | Actions Semiconductor Co., Ltd. |
| ACTU | Actuate Corporation | ACUR | Acura Pharmaceuticals, Inc. |
| ACUS | Acusphere, Inc. | ACWI | iShares MSCI ACWI Index Fund |
| ACWX | iShares MSCI ACWI ex US Index Fund | ACXM | Acxiom Corporation |
| ADAM | A.D.A.M. Inc. | ADAT | Authentidate Holding Corp. |
| ADBE | Adobe Systems Incorporated | ADCT | ADC Telecommunications, Inc. |
| ADEP | Adept Technology, Inc. | ADES | ADA-ES, Inc. |
| ADGF | Adams Golf, Inc. | ADLR | Adolor Corporation |
| ADLS | Advanced Life Sciences Holdings, Inc. | ADPI | American Dental Partners, Inc. |
| ADPT | Adaptec, Inc. | ADRA | BLDRS Asia 50 ADR Index Fund |
| ADRD | BLDRS Developed Markets 100 ADR Index Fund | ADRE | BLDRS Emerging Markets 50 ADR Index Fund |
| ADRU | BLDRS Europe 100 ADR Index Fund | ADSK | Autodesk, Inc. |
| ADTN | ADTRAN, Inc. | ADVNA | ADVANTA Corp. |
| ADVNB | ADVANTA Corp. | ADVS | Advent Software, Inc. |
| AEHR | Aehr Test Systems | AEIS | Advanced Energy Industries, Inc. |
| AEPI | AEP Industries Inc. | AERG | Applied Energetics, Inc |
| AERO | AeroGrow International, Inc. | AERT | Advanced Environmental Recycling Technologies, Inc. |
| AETI | American Electric Technologies, Inc. | AEY | ADDvantage Technologies Group, Inc. |
| AEZS | AEterna Zentaris, Inc. | AFAM | Almost Family Inc |
| AFCE | AFC Enterprises, Inc. | AFFM | Affirmative Insurance Holdings, Inc. |
| AFFX | Affymetrix, Inc. | AFFY | Affymax, Inc. |
| AFOP | Alliance Fiber Optic Products, Inc. | AFSI | AmTrust Financial Services, Inc. |
| AGEN | Antigenics Inc. | AGII | Argo Group International Holdings Ltd. |
| AGIX | AtheroGenics, Inc. | AGNC | American Capital Agency Corp. |
| AGYS | Agilysys, Inc. | AHCI | Allied HealthCare International Inc. |
| AHGP | Alliance Holdings GP, L.P. | AHII | Animal Health International, Inc. |
| AHPI | Allied Healthcare Products, Inc. | AIMC | Altra Holdings, Inc. |
| AINV | Apollo Investment Corporation | AIRM | Air Methods Corporation |
| AIRN | Airspan Networks Inc. | AIRT | Air T, Inc. |
| AIRV | Airvana, Inc. | AIXD | Access Integrated Technologies, Inc. |
| AIXG | Aixtron Aktiengesellschaft | AKAM | Akamai Technologies, Inc. |
| AKNS | Akeena Solar, Inc. | AKRX | Akorn, Inc. |
| ALAN | Alanco Technologies Inc. | ALCO | Alico, Inc. |
| ALDA | Aldila, Inc. | ALDN | Aladdin Knowledge Systems Limited |
| ALEX | Alexander & Baldwin, Inc. | ALGN | Align Technology, Inc. |
| ALGT | Allegiant Travel Company | ALKS | Alkermes, Inc. |
| ALLB | Alliance Bancorp, Inc. of Pennsylvania | ALLI | Allion Healthcare, Inc. |
| ALLT | Allot Communications Ltd. | ALNC | Alliance Financial Corporation |
| ALNY | Alnylam Pharmaceuticals, Inc. | ALOG | Analogic Corporation |
| ALOT | Astro-Med, Inc. | ALOY | Alloy, Inc. |
| ALSE | Alseres Pharmaceuticals, Inc. | ALSK | Alaska Communications Systems Group, Inc. |
| ALTH | Allos Therapeutics, Inc. | ALTI | Altair Nanotechnologies Inc. |
| ALTR | Altera Corporation | ALTU | Altus Pharmaceuticals Inc. |
| ALUS | Alsius Corporation | ALUSU | Alsius Corporation |
| ALUSW | Alsius Corporation | ALVR | Alvarion Ltd. |
| ALXA | Alexza Pharmaceuticals, Inc. | ALXN | Alexion Pharmaceuticals, Inc. |
| AMAC | American Medical Alert Corp. | AMAG | AMAG Pharmaceuticals, Inc. |
| AMAT | Applied Materials, Inc. | AMCC | Applied Micro Circuits Corporation |
| AMCE | American Claims Evaluation, Inc. | AMCN | AirMedia Group Inc |
| AMCP | AmCOMP Incorporated | AMCS | AMICAS, Inc. |
| AMED | Amedisys Inc | AMEN | AMEN Properties Inc. |
| AMFI | Amcore Financial, Inc. | AMGN | Amgen Inc. |
| AMIC | American Independence Corp. | AMIE | Ambassadors International, Inc. |
| AMIN | American International Industries Inc | AMKR | Amkor Technology, Inc. |
| AMLN | Amylin Pharmaceuticals, Inc. | AMMD | American Medical Systems Holdings, Inc. |
| AMNB | American National Bankshares, Inc. | AMOT | Allied Motion Technologies, Inc. |
| AMOV | America Movil, S.A.B. de C.V. | AMPH | American Physicians Service Group, Inc. |
| AMPL | Ampal-American Israel Corporation | AMRB | American River Bankshares |
| AMRI | Albany Molecular Research, Inc. | AMRN | Amarin Corporation PLC |
| AMSC | American Superconductor Corporation | AMSF | AMERISAFE, Inc. |
| AMSG | Amsurg Corp. | AMSWA | American Software, Inc. |
| AMTC | Ameritrans Capital Corporation | AMTCP | Ameritrans Capital Corporation |
| AMTD | TD Ameritrade Holding Corporation | AMTY | Amerityre Corporation |
| AMWD | American Woodmark Corporation | AMZN | Amazon.com, Inc. |
| ANAD | ANADIGICS, Inc. | ANAT | American National Insurance Company |
| ANCX | Access National Corporation | ANDE | Andersons, Inc. (The) |
| ANDS | Anadys Pharmaceuticals, Inc. | ANEN | Anaren, Inc. |
| ANGN | Angeion Corporation | ANGO | AngioDynamics, Inc. |
| ANIK | Anika Therapeutics Inc. | ANLY | Analysts International Corporation |
| ANNB | Annapolis Bancorp Inc. | ANPI | Angiotech Pharmaceuticals, Inc. |
| ANSS | ANSYS, Inc. | ANSV | Anesiva, Inc. |
| ANSW | Answers Corporation | ANTP | PHAZAR CORP |
| APAB | Appalachian Bancshares, Inc. (GA) | APAC | APAC Customer Services, Inc. |
| APAGF | APCO Argentina Inc. | APEI | American Public Education, Inc. |
| APFC | American Pacific Corporation | APII | Action Products International, Inc. |
| APKT | Acme Packet, Inc. | APOG | Apogee Enterprises, Inc. |
| APOL | Apollo Group, Inc. | APPA | A.P. Pharma, Inc. |
| APPX | APP Pharmaceuticals | APPY | AspenBio Pharma, Inc. |
| APSA | Alto Palermo S.A. | APSG | Applied Signal Technology, Inc. |
| APWR | A-Power Energy Generation Systems, Ltd. | ARAY | Accuray Incorporated |
| ARBA | Ariba, Inc. | ARBX | Arbinet-thexchange, Inc. |
| ARCC | Ares Capital Corporation | ARCI | Appliance Recycling Centers of America, Inc. |
| ARCW | Arc Wireless Solutions, Inc. | ARDNA | Arden Group, Inc. |
| AREX | Approach Resources Inc. | ARGN | Amerigon Incorporated |
| ARIA | ARIAD Pharmaceuticals, Inc. | ARII | American Railcar Industries, Inc. |
| ARKR | Ark Restaurants Corp. | ARLP | Alliance Resource Partners, L.P. |
| ARMH | ARM Holdings, plc | ARNA | Arena Pharmaceuticals, Inc. |
| AROW | Arrow Financial Corporation | ARQL | ArQule, Inc. |
| ARRS | Arris Group Inc | ARRY | Array BioPharma Inc. |
| ARSD | Arabian American Development Company | ARST | Arc Sight, Inc. |
| ARTC | ArthroCare Corporation | ARTE | Artes Medical, Inc. |
| ARTG | Art Technology Group, Inc. | ARTL | The Aristotle Corporation |
| ARTLP | The Aristotle Corporation | ARTNA | Artesian Resources Corporation |
| ARTW | Art's-Way Manufacturing Co., Inc. | ARTX | Arotech Corporation |
| ARUN | Aruba Networks, Inc. | ARWR | Arrowhead Research Corporation |
| ARYX | ARYx Therapeutics, Inc. | ASBC | Associated Banc-Corp |
| ASBI | Ameriana Bancorp | ASCA | Ameristar Casinos, Inc. |
| ASEI | American Science and Engineering, Inc. | ASFI | Asta Funding, Inc. |
| ASFN | Atlantic Southern Financial Group, Inc. | ASGN | On Assignment, Inc. |
| ASGR | America Service Group Inc. | ASHW | Ashworth, Inc. |
| ASIA | AsiaInfo Holdings, Inc. | ASMI | ASM International N.V. |
| ASML | ASML Holding N.V. | ASPM | Aspect Medical Systems, Inc. |
| ASRV | AmeriServ Financial Inc. | ASRVP | AmeriServ Financial Inc. |
| ASTE | Astec Industries, Inc. | ASTI | Ascent Solar Technologies, Inc. |
| ASTIZ | Ascent Solar Technologies, Inc. | ASTM | Aastrom Biosciences, Inc. |
| ASUR | Forgent Networks Inc | ASYS | Amtech Systems, Inc. |
| ASYT | Asyst Technologies, Inc. | ATAC | ATC Technology Corporation |
| ATAI | ATA Inc. | ATAX | America First Tax Exempt Investors, L.P. |
| ATBC | Atlantic BancGroup Inc | ATCO | American Technology Corporation |
| ATEA | Astea International, Inc. | ATEC | Alphatec Holdings, Inc. |
| ATGN | AltiGen Communications, Inc. | ATHN | athenahealth, Inc. |
| ATHR | Atheros Communications, Inc. | ATHX | Athersys, Inc. |
| ATLO | Ames National Corporation | ATLS | Atlas America, Inc. |
| ATMI | ATMI Inc. | ATML | Atmel Corporation |
| ATNI | Atlantic Tele-Network, Inc. | ATPG | ATP Oil & Gas Corporation |
| ATRC | AtriCure, Inc. | ATRI | ATRION Corporation |
| ATRM | Aetrium Incorporated | ATRO | Astronics Corporation |
| ATSG | Air Transport Services Group, Inc | ATSI | ATS Medical, Inc. |
| ATVI | Activision Blizzard, Inc | AUBN | Auburn National Bancorporation, Inc. |
| AUDC | AudioCodes Ltd. | AUSA | Access Plans USA, Inc. |
| AUTH | AuthenTec, Inc. | AUXL | Auxilium Pharmaceuticals, Inc. |
| AVAN | Avant Immunotherapeutics, Inc. | AVAV | AeroVironment, Inc. |
| AVCA | Advocat, Inc. | AVCT | Avocent Corporation |
| AVGN | Avigen, Inc. | AVID | Avid Technology, Inc. |
| AVII | AVI BioPharma, Inc. | AVNR | Avanir Pharmaceuticals |
| AVNXD | Avanex Corporation | AVRX | Avalon Pharmaceuticals, Inc. |
| AVSR | Avistar Communications Corporation | AVTR | Avatar Holdings Inc. |
| AVZA | Aviza Technology, Inc. | AWBC | AmericanWest Bancorporation |
| AWRE | Aware, Inc. | AXAS | Abraxas Petroleum Corporation |
| AXTI | AXT Inc | AXYS | Axsys Technologies, Inc. |