Other ETFs tracking micro-caps include the PowerShares Zacks Micro Cap Portfolio (NYSEArca: PZI) and  the Guggenheim Wilshire Micro-Cap ETF (NYSEArca: WMCR).

PZI tracks a smaller portfolio of 400 micro-cap stocks. The underlying index identifies micro-caps with the greatest potential to outperform passive benchmarks and other actively managed strategies.

WMCR “tracks the Wilshire US Micro Cap Index, a rules-based index made up of the lowest 2,500 stocks in the Wilshire 5000 Index, as measured by market capitalization,” according to Investopedia.

For more information on micro capitalization funds, visit our micro-cap category.

iShares Micro-Cap ETF