Short Interest Swings in Biotech Stocks (AMGN, CELG, PCYC)

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