“”I think there’s just some nervousness heading into the election, but if we back up really since most of this year, small caps have been doing quite well, and within a pretty placid market over the past few months,” Eddy Elfenbein, editor of the Crossing Wall Street blog, said in an interview with CNBC.

IWM and IJR have large weights to financial services and healthcare stocks, explaining why the small-cap ETFs are lagging the S&P 500 this year.

For more information on the small-cap segment, visit our small-cap category.

iShares Core S&P Small-Cap ETF

Tom Lydon’s clients own shares of IWM.