Impressive Bull Run in Biotech ETFs Causes Some to Take Pause

The biotechnology sector and related exchange traded funds are breaking out to new highs, but the rapid ascension has some worried about valuations. The iShares Nasdaq Biotechnology ETF (NasdaqGS: IBB), the largest biotech ETF by assets, has surged 27.9% year-to-date while the S&P 500 index has...