From Nasdaq:
Despite several concerns, the Nasdaq has been outperforming its fellow benchmarks right from the start of 2015. While weak second quarter earnings season and a continuous slump in crude prices dragged the Dow down by 2% over the last month, the Nasdaq gained nearly 1.2%. It also outpaced the S&P 500, which rose a meager 0.2% over the past month. However, a 4.3% decline in iShares Nasdaq Biotechnology (IBB) dampened the benchmark yesterday.