EZM curates a portfolio of US mid-cap stocks with a focus on earnings. Companies are selected and weighted by earningsthose with greater profits are assigned larger portfolio weights. The fund's earnings screens and its firm size boundaries combine for a big allocation to small-caps. Dipping into small-cap territory elevates the EZM's market risk, and its focus on earnings can lead to sector bets at times. The index is reconstituted and rebalanced on an annual basis.