FSMD tracks an index of small- and mid-cap US market stocks selected and weighted using a wide variety of valuation metrics. The fund looks for a combination of attractive valuations, high quality profiles, positive momentum signals, lower volatility than the emerging equities market at large, and lower correlation to the U.S. equity market. This index is a subset of the Fidelity U.S. Total Investable Market Index, but excludes the 500 largest companies included in the broader index. Prior to December 1, 2020, the fund was previously called the Fidelity Small-Mid Factor ETF and tracked the Fidelity Small-Mid Factor Index.