Largest Nasdaq Short Interest Changes as of March 31

The following are the 50 largest short interest changes on the Nasdaq Stock Market as of the March 31 settlement date. The table ranks the top 50 positive changes followed by the top negative changes.

TOP 50 INCREASES


Ticker                                                                   
Symbol   Company                    March 31       March 15        Change    
=============================================================================
WTSLA    WET SEAL INC -A           18,354,857      6,026,002     12,328,855
SIRI     SIRIUS XM RADIO          265,453,444    255,399,482     10,053,962
EXPE     EXPEDIA INC               23,199,282     13,903,341      9,295,941
QQQ      POWERSH-QQQ               91,123,690     82,024,352      9,099,338
CTIC     CELL THERAPEUTIC          58,853,164     50,308,467      8,544,697
ILMN     ILLUMINA INC              20,401,717     14,273,942      6,127,775
AXAS     ABRAXAS PETRO             11,417,441      6,046,834      5,370,607
DELL     DELL INC                  61,173,168     56,387,785      4,785,383
RIMM     RESEARCH IN MOTI          26,930,270     22,679,516      4,250,754
UCBI     UNITED COMMUNITY           8,299,432      4,113,672      4,185,760
CLNE     CLEAN ENERGY FUE          11,697,211      8,498,117      3,199,094
FLEX     FLEXTRONICS INTL          14,607,097     11,664,889      2,942,208
CLWR     CLEARWIRE -CL A           48,152,320     45,328,975      2,823,345
ATML     ATMEL CORP                 9,804,059      7,027,932      2,776,127
ATPG     ATP OIL & GAS             19,385,791     16,687,184      2,698,607
PLAB     PHOTRONICS INC             7,042,360      4,451,767      2,590,593
IPXL     IMPAX LABS INC             4,816,203      2,263,696      2,552,507
CA       CA INC                    11,230,998      8,684,694      2,546,304
EBAY     EBAY INC                  17,155,883     14,637,721      2,518,162
CIEN     CIENA CORP                25,976,262     23,490,390      2,485,872
VPHM     VIROPHARMA INC             8,409,466      6,084,757      2,324,709
ADSK     AUTODESK INC               5,904,391      3,640,872      2,263,519
CCME     CHINA MEDIAEXPRE          10,322,272      8,069,024      2,253,248
CAST     CHINACAST EDUCAT           8,480,238      6,237,363      2,242,875
SATC     SATCON TECH               21,352,212     19,123,995      2,228,217
REXX     REX ENERGY CORP            9,744,580      7,522,212      2,222,368
ENTG     ENTEGRIS INC               6,095,537      3,903,486      2,192,051
ERIC     ERICSSON LM-ADR           19,731,216     17,553,508      2,177,708
EXEL     EXELIXIS INC              10,532,291      8,392,316      2,139,975
JRCC     JAMES RIVER COAL           8,038,102      6,031,597      2,006,505
JBLU     JETBLUE AIRWAYS           48,673,234     46,690,382      1,982,852
FRED     FRED'S INC-A               5,366,976      3,394,242      1,972,734
VCLK     VALUECLICK INC             9,405,818      7,508,760      1,897,058
YHOO     YAHOO! INC                50,725,452     48,870,413      1,855,039
CASY     CASEY'S GENERAL            3,162,926      1,410,592      1,752,334
WIN      WINDSTREAM CORP           20,780,684     19,127,503      1,653,181
ESRX     EXPRESS SCRIPT             8,836,122      7,245,181      1,590,941
CNXT     CONEXANT SYS               6,027,018      4,456,696      1,570,322
HIBB     HIBBETT SPORTS I           4,448,570      2,878,564      1,570,006
GPOR     GULFPORT ENERGY            2,568,387        999,288      1,569,099
ARIA     ARIAD PHARM               11,379,008      9,834,122      1,544,886
TSLA     TESLA MOTORS              13,155,130     11,640,023      1,515,107
GERN     GERON CORP                12,890,273     11,383,713      1,506,560
RUE      RUE21 INC                  3,801,122      2,299,141      1,501,981
SPWRA    SUNPOWER CORP-A           16,201,280     14,712,301      1,488,979
GEOI     GEORESOURCES INC           2,521,980      1,069,238      1,452,742
PSMT     PRICESMART INC             1,964,529        546,197      1,418,332
ARNA     ARENA PHARMACEUT          32,523,407     31,106,237      1,417,170
SOXX     ISHARES PHLX SOX           5,363,889      3,971,529      1,392,360
SFLY     SHUTTERFLY INC             4,029,186      2,645,552      1,383,634

TOP 50 DECREASES


Ticker                                                                   
Symbol   Company                    March 31       March 15        Change    
=============================================================================
MU       MICRON TECH               48,366,953     56,937,130     -8,570,177
CSCO     CISCO SYSTEMS             54,572,759     62,558,972     -7,986,213
NVDA     NVIDIA CORP               23,106,598     27,877,041     -4,770,443
GSIC     GSI COMMERCE INC           5,337,144      9,976,883     -4,639,739
PBCT     PEOPLE'S UNITED           22,272,292     26,887,863     -4,615,571
GMCR     GREEN MOUNTAIN            21,548,151     26,053,365     -4,505,214
ATVI     ACTIVISION BLIZZ          17,525,985     21,400,139     -3,874,154
PWER     POWER-ONE INC             34,513,596     38,048,179     -3,534,583
LVLT     LEVEL 3 COMM INC          89,379,553     92,773,228     -3,393,675
PAYX     PAYCHEX INC                5,517,198      8,902,811     -3,385,613
INFA     INFORMATICA CORP           2,666,898      6,024,355     -3,357,457
CMCSA    COMCAST CORP-A            40,517,938     43,595,878     -3,077,940
ONNN     ON SEMICONDUCTOR          17,585,863     20,529,122     -2,943,259
OREX     OREXIGEN THERAPE           6,071,987      8,863,202     -2,791,215
TLAB     TELLABS INC               15,939,997     18,650,214     -2,710,217
NOVL     NOVELL INC                 1,458,134      4,134,721     -2,676,587
SBAC     SBA COMM CORP-A            8,292,916     10,919,717     -2,626,801
SOMX     SOMAXON PHARMACE          10,134,651     12,688,281     -2,553,630
SOLR     GT SOLAR INTERNA          10,194,408     12,555,907     -2,361,499
BPOP     POPULAR INC               13,761,142     15,886,247     -2,125,105
RFMD     RF MICRO DEVICES          17,974,264     19,938,319     -1,964,055
PTEN     PATTERSON-UTI              8,777,848     10,734,244     -1,956,396
PMCS     PMC-SIERRA INC             6,107,954      8,023,361     -1,915,407
MIPS     MIPS TECH INC              9,669,767     11,546,394     -1,876,627
CTXS     CITRIX SYSTEMS             5,072,427      6,872,837     -1,800,410
AMSC     AMER SUPERCONDTR           8,984,253     10,730,400     -1,746,147
HBAN     HUNTINGTON BANC           23,121,362     24,835,557     -1,714,195
STX      SEAGATE TECHNOLO          12,387,573     14,057,765     -1,670,192
DRYS     DRYSHIPS INC              12,902,712     14,482,682     -1,579,970
NDAQ     NASDAQ OMX GROUP           3,319,528      4,880,752     -1,561,224
SPIL     SILICONWARE-ADR            4,563,690      6,095,494     -1,531,804
DTV      DIRECTV-A                 12,930,593     14,449,912     -1,519,319
BEXP     BRIGHAM EXPLOR             9,298,571     10,807,227     -1,508,656
GRMN     GARMIN LTD                20,376,568     21,865,840     -1,489,272
INTC     INTEL CORP                56,695,649     58,169,264     -1,473,615
SBUX     STARBUCKS CORP            12,374,944     13,821,025     -1,446,081
XOMA     XOMA LTD                   3,276,059      4,710,435     -1,434,376
NFLX     NETFLIX INC               10,490,745     11,893,402     -1,402,657
CDNS     CADENCE DESIGN            17,368,306     18,768,943     -1,400,637
CHRW     CH ROBINSON                9,426,629     10,803,015     -1,376,386
CY       CYPRESS SEMICON            6,368,367      7,694,381     -1,326,014
SNDK     SANDISK CORP               7,280,719      8,593,558     -1,312,839
INTU     INTUIT INC                 4,116,421      5,394,844     -1,278,423
DISCA    DISCOVERY COMM-A          12,847,444     14,114,996     -1,267,552
MAT      MATTEL INC                 5,410,619      6,551,017     -1,140,398
EMKR     EMCORE CORP                3,386,187      4,458,319     -1,072,132
QCOM     QUALCOMM INC              17,753,456     18,817,553     -1,064,097
CTRP     CTRIP.COM-ADR              5,234,906      6,295,525     -1,060,619
VRTX     VERTEX PHARM               8,498,113      9,537,398     -1,039,285
MENT     MENTOR GRAPHICS            4,039,319      5,072,540     -1,033,221

*-- Data includes ETF positions.

-- Bloomberg News To contact Bloomberg News for this story: +1-212-318-2000 or newsdev@bloomberg.net

-0- Apr/13/2011 21:31 GMT

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