The above graph shows that, after 2013, the iShares Nasdaq Biotechnology ETF (IBB) has registered the best performance, amounting to annualized return of about 48%. Other biotechnology stocks such as Biogen, Amgen (AMGN), Gilead Sciences (GILD), and Celgene (CELG) registered annualized returns of 31.9%, 25.9%, 17.7%, and 22.6%, respectively.