Last week, investors added $1.19 billion to IWM, a total surpassed by just one ETF. IJR saw inflows of $440.23 million, putting it seventh among all U.S. ETFs for inflows last week.

The Russell 2000 has lagged the S&P 500 over the past two years, which could be a sign the small-cap index has some ground to make up, said Hogan in the CNBC interview.

For more information on small-capitalization stocks, visit our small-cap category.

Tom Lydon’s clients own shares of IWM.