Biotech ETFs tumble as Celgene’s quarterly results and outlook weigh By: MarketWatch October 26, 2017 at 10:24 AM EDT Exchange-traded funds that track the biotechnology sector sink on Thursday, following weak quarterly results from a major component. Read More >> Related Stocks: Arrowhead Pharma Celgene Corp Nasdaq Biotechnology Ishares ETF Nasdaq Composite Novavax Inc United States Steel Corp