XSMO offers a momentum take on US small-caps culled from the S&P SmallCap 600, a market-cap-weighted index that consists of US small-cap companies screened for size, liquidity, and financial viability. The underlying index selects approximately 120 names with the highest momentum score, derived from 12-month performance excluding the most recent month and favors stocks with lower volatility. Selected securities are weighted by a combination of market cap and momentum score, and are constrained such that individual securities will not exceed 9% weight of the portfolio and three times its market cap in the index universe. Prior to June 24, 2019 the fund tracked a Russell growth index under a different name and ticker (PXSG).