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Tuesday, Aug 28
2012, 10:44 AM
Short sellers continue to bet on biotech firms compared to the July 31 settlement date. Arena...
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.