Shares of Biogen Inc. BIIB rallied 2.40% to $133.19 Wednesday, on what proved to be an all-around mixed trading session for the stock market, with the S&P 500 Index SPX rising 0.47% to 6,227.42 and ...

SPDR S&P Biotech ETF ETF holdings by MarketWatch. View complete XBI exchange traded fund holdings for better informed ETF trading.