The Oppenheimer ESG Revenue ETF begins with the SP 500 Index as its starting universe. The top 50% of the universe is selected by relative ESG score, which is calculated by Sustainalytics. Companies with controversies that fall into Category 4 or higher out of 5, with 5 being highest, will be eliminated. Each security that meets these parameters are then ranked by top line revenue, instead of market capitalization. The fund is rebalanced quarterly.