Short Interest Swings in Biotech Stocks (BIIB, CELG, VVUS)

The short interest in biotech and emerging pharmaceutical companies was mixed again in the first two weeks of January. The number of shares sold short in Arena Pharmaceuticals (NASDAQ: ARNA ), Dendreon (NASDAQ: DNDN ), Gilead Sciences (NASDAQ: GILD ), Onyx Pharmaceuticals (NASDAQ: ONXX )