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Short sellers continue to bet on biotech firms compared to the July 31 settlement date. Arena...

  • Tuesday, August 28, 2012, 10:44 AM ET
    Short sellers continue to bet on biotech firms compared to the July 31 settlement date. Arena Pharmaceuticals (ARNA -0.3%), Gilead Sciences (GILD +1.4%), Pharmacyclics (PCYC -2.2%), Vertex Pharmaceuticals (VRTX -0.6%) and VIVUS (VVUS -0.4%) all saw short interest rise more than 9% between July 31 and August 15. Two exceptions to the rule worth noting however, are Alexion Pharmaceuticals (ALXN +0.1%) and Biogen Idec (BIIB -0.4%), both of which saw short interest decline by 10% and 8.4%, respectively.
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This news story has 3 comments:

  •  
    The short interest on Apple (AAPL) also jumped , but the stock made a new high yesterday. The fundemental is the key to determine who is right or wrong. ARNA has a big potential.
    28 Aug 2012, 10:59 AM Reply Like
  •  
    Agree with you. I am long ARNA myself.
    28 Aug 2012, 12:01 PM Reply Like
  •  
    Volume has died down considerably since the approvals for both ARNA and VVUS. If the shorts aren't hedged they can get burnt with no volume to cover a mark to market call to force buy-in.
    28 Aug 2012, 01:19 PM Reply Like
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