The fund uses an active, rules-based investment strategy to build its portfolio. The fund evaluates securities of large- and mid-cap US companies using a quantitative model that identifies growth, value, quality and risk characteristics. A minimum variance approach is also used to minimize portfolio volatility. After selecting its portfolio holdings, QUS incorporates country, industry, group, sector and individual security constraints to achieve portfolio diversification, liquidity and risk mitigation. The portfolio is reconstituted and rebalanced on a monthly basis. Investors should note that frequent buying and selling of securities could lead to a high portfolio turnover.