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Biotech stocks to buy in 2015: Biotech was one of the most profitable sectors this year. Through Dec. 18, the S&P 500 Biotechnology Index is up 43.6% in 2014, and the Nasdaq Biotechnology Index is up 36.9%.
Those gains are three to six times as big as the broader markets'. In 2014 through Dec. 18, the Dow Jones Industrial Average is up just 6.1%, the S&P 500 10.3%, and the Nasdaq 12.8%.